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Hello,

this is a draft for a proposal to add a special meaning to the identifier
__ (double underscore) so that it can be used (even repeatedly in the same
lexical scope) for all variables whose name is not important and that is no
longer needed after declaration. The draft includes a few examples.

Is there any interest in this?

Thanks in advance,

Alberto

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<div dir=3D"ltr">Hello,<br><br>this is a draft for a proposal to add a spec=
ial meaning to the identifier __ (double underscore) so that it can be used=
 (even repeatedly in the same lexical scope) for all variables whose name i=
s not important and that is no longer needed after declaration. The draft i=
ncludes a few examples.<br><br>Is there any interest in this?<br><br>Thanks=
 in advance,<br><br>Alberto<br><br></div>

<p></p>

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------=_Part_9069_1290673214.1490646431390--

.

--94eb2c122e4e760c2d054bbc817e
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Hi,

Thanks for taking the time out to write this! It seems like there is
motivation, but I can't quite place my finger on it. If a variable isn't
going to be used again, and can't be referenced, what are the benefits of
its persistence have over `Foo{bar};`?

Cheers,

Chris

On Tue., 28 Mar. 2017, 07:27 Alberto Barbati, <albertobarbati@gmail.com>
wrote:

> Hello,
>
> this is a draft for a proposal to add a special meaning to the identifier
> __ (double underscore) so that it can be used (even repeatedly in the same
> lexical scope) for all variables whose name is not important and that is no
> longer needed after declaration. The draft includes a few examples.
>
> Is there any interest in this?
>
> Thanks in advance,
>
> Alberto
>
> --
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>

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<p dir=3D"ltr">Hi,</p>
<p dir=3D"ltr">Thanks for taking the time out to write this! It seems like =
there is motivation, but I can&#39;t quite place my finger on it. If a vari=
able isn&#39;t going to be used again, and can&#39;t be referenced, what ar=
e the benefits of its persistence have over `Foo{bar};`?</p>
<p dir=3D"ltr">Cheers,</p>
<p dir=3D"ltr">Chris </p>
<br><div class=3D"gmail_quote"><div dir=3D"ltr">On Tue., 28 Mar. 2017, 07:2=
7 Alberto Barbati, &lt;<a href=3D"mailto:albertobarbati@gmail.com">albertob=
arbati@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" =
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><di=
v dir=3D"ltr" class=3D"gmail_msg">Hello,<br class=3D"gmail_msg"><br class=
=3D"gmail_msg">this is a draft for a proposal to add a special meaning to t=
he identifier __ (double underscore) so that it can be used (even repeatedl=
y in the same lexical scope) for all variables whose name is not important =
and that is no longer needed after declaration. The draft includes a few ex=
amples.<br class=3D"gmail_msg"><br class=3D"gmail_msg">Is there any interes=
t in this?<br class=3D"gmail_msg"><br class=3D"gmail_msg">Thanks in advance=
,<br class=3D"gmail_msg"><br class=3D"gmail_msg">Alberto<br class=3D"gmail_=
msg"><br class=3D"gmail_msg"></div>

<p class=3D"gmail_msg"></p>

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</blockquote></div>

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.

On 27 March 2017 at 23:27, Alberto Barbati <albertobarbati@gmail.com> wrote:
> Hello,
>
> this is a draft for a proposal to add a special meaning to the identifier __
> (double underscore) so that it can be used (even repeatedly in the same
> lexical scope) for all variables whose name is not important and that is no
> longer needed after declaration. The draft includes a few examples.
>
> Is there any interest in this?

There certainly is: http://cplusplus.github.io/EWG/ewg-active.html#35

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.

On segunda-feira, 27 de mar=C3=A7o de 2017 13:27:11 PDT Alberto Barbati wro=
te:
> Hello,
>=20
> this is a draft for a proposal to add a special meaning to the identifier
> __ (double underscore) so that it can be used (even repeatedly in the sam=
e
> lexical scope) for all variables whose name is not important and that is =
no
> longer needed after declaration. The draft includes a few examples.
>=20
> Is there any interest in this?

Just remember that there are already existing codebases using __ as identif=
ier=20
or macro names.

--=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

--=20
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..org/d/msgid/std-proposals/2752007.h0gmCLmLCc%40tjmaciei-mobl1.

.

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On Mon, Mar 27, 2017 at 2:30 PM, Thiago Macieira <thiago@macieira.org>
wrote:

> On segunda-feira, 27 de mar=C3=A7o de 2017 13:27:11 PDT Alberto Barbati w=
rote:
> > Hello,
> >
> > this is a draft for a proposal to add a special meaning to the identifi=
er
> > __ (double underscore) so that it can be used (even repeatedly in the
> same
> > lexical scope) for all variables whose name is not important and that i=
s
> no
> > longer needed after declaration. The draft includes a few examples.
> >
> > Is there any interest in this?
>
> Just remember that there are already existing codebases using __ as
> identifier
> or macro names.
>

They're not allowed. "_" is ok outside of the global namespace, but "__" is
reserved by [lex.name].

Jeffrey

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uKyfg%40mail.gmail.com.

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On M=
on, Mar 27, 2017 at 2:30 PM, Thiago Macieira <span dir=3D"ltr">&lt;<a href=
=3D"mailto:thiago@macieira.org" target=3D"_blank" class=3D"cremed">thiago@m=
acieira.org</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span c=
lass=3D"">On segunda-feira, 27 de mar=C3=A7o de 2017 13:27:11 PDT Alberto B=
arbati wrote:<br>
&gt; Hello,<br>
&gt;<br>
&gt; this is a draft for a proposal to add a special meaning to the identif=
ier<br>
&gt; __ (double underscore) so that it can be used (even repeatedly in the =
same<br>
&gt; lexical scope) for all variables whose name is not important and that =
is no<br>
&gt; longer needed after declaration. The draft includes a few examples.<br=
>
&gt;<br>
&gt; Is there any interest in this?<br>
<br>
</span>Just remember that there are already existing codebases using __ as =
identifier<br>
or macro names.<br></blockquote><div><br></div><div>They&#39;re not allowed=
.. &quot;_&quot; is ok outside of the global namespace, but &quot;__&quot; i=
s reserved by [<a href=3D"http://lex.name">lex.name</a>].</div><div><br></d=
iv><div>Jeffrey</div></div></div></div>

<p></p>

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.

On segunda-feira, 27 de mar=C3=A7o de 2017 15:16:58 PDT 'Jeffrey Yasskin' v=
ia ISO C
++ Standard - Future Proposals wrote:
> > Just remember that there are already existing codebases using __ as
> > identifier
> > or macro names.
>=20
> They're not allowed. "_" is ok outside of the global namespace, but "__" =
is
> reserved by [lex.name].

I know it is.

And yet it's in use.
https://github.com/v8/v8/blob/master/src/x64/codegen-x64.cc#L33


--=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

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Hi Chris,

Even if it cannot be referenced again, a __ variable is still a variable an=
d therefore it ends its lifetime at the end of the lexical scope. Its destr=
uctor is therefore called when the scope is exited either normally or excep=
tionally and no sooner. This is the main point of the RAII idiom. On the ot=
her hand, `Foo{bar};` creates a temporary object that is immediately destro=
yed at the end of the statement.

Cheers,

Alberto

> Il giorno 27 mar 2017, alle ore 22:51, Christopher Di Bella <cjdb.ns@gmai=
l.com> ha scritto:
>=20
> Hi,
>=20
> Thanks for taking the time out to write this! It seems like there is moti=
vation, but I can't quite place my finger on it. If a variable isn't going =
to be used again, and can't be referenced, what are the benefits of its per=
sistence have over `Foo{bar};`?
>=20
> Cheers,
>=20
> Chris
>=20
>=20
>> On Tue., 28 Mar. 2017, 07:27 Alberto Barbati, <albertobarbati@gmail.com>=
 wrote:
>> Hello,
>>=20
>> this is a draft for a proposal to add a special meaning to the identifie=
r __ (double underscore) so that it can be used (even repeatedly in the sam=
e lexical scope) for all variables whose name is not important and that is =
no longer needed after declaration. The draft includes a few examples.
>>=20
>> Is there any interest in this?
>>=20
>> Thanks in advance,
>>=20
>> Alberto
>>=20
>> --=20
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s "ISO C++ Standard - Future Proposals" group.
>> To unsubscribe from this group and stop receiving emails from it, send a=
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>> To post to this group, send email to std-proposals@isocpp.org.
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cpp.org/d/msgid/std-proposals/985b9b2a-c734-45eb-95f4-db4dc0d309a1%40isocpp=
..org.
>=20
> --=20
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=
=3Dutf-8"></head><body dir=3D"auto"><div></div><div>Hi Chris,</div><div><br=
></div><div>Even if it cannot be referenced again, a __ variable is still a=
 variable and therefore it ends its lifetime at the end of the lexical scop=
e. Its destructor is therefore called when the scope is exited either norma=
lly or exceptionally and no sooner. This is the main point of the RAII idio=
m. On the other hand, `Foo{bar};` creates a temporary object that is immedi=
ately destroyed at the end of the statement.</div><div><br></div><div>Cheer=
s,</div><div><br></div><div>Alberto</div><div><br>Il giorno 27 mar 2017, al=
le ore 22:51, Christopher Di Bella &lt;<a href=3D"mailto:cjdb.ns@gmail.com"=
>cjdb.ns@gmail.com</a>&gt; ha scritto:<br><br></div><blockquote type=3D"cit=
e"><div><p dir=3D"ltr">Hi,</p>
<p dir=3D"ltr">Thanks for taking the time out to write this! It seems like =
there is motivation, but I can't quite place my finger on it. If a variable=
 isn't going to be used again, and can't be referenced, what are the benefi=
ts of its persistence have over `Foo{bar};`?</p>
<p dir=3D"ltr">Cheers,</p>
<p dir=3D"ltr">Chris </p>
<br><div class=3D"gmail_quote"><div dir=3D"ltr">On Tue., 28 Mar. 2017, 07:2=
7 Alberto Barbati, &lt;<a href=3D"mailto:albertobarbati@gmail.com">albertob=
arbati@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" =
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><di=
v dir=3D"ltr" class=3D"gmail_msg">Hello,<br class=3D"gmail_msg"><br class=
=3D"gmail_msg">this is a draft for a proposal to add a special meaning to t=
he identifier __ (double underscore) so that it can be used (even repeatedl=
y in the same lexical scope) for all variables whose name is not important =
and that is no longer needed after declaration. The draft includes a few ex=
amples.<br class=3D"gmail_msg"><br class=3D"gmail_msg">Is there any interes=
t in this?<br class=3D"gmail_msg"><br class=3D"gmail_msg">Thanks in advance=
,<br class=3D"gmail_msg"><br class=3D"gmail_msg">Alberto<br class=3D"gmail_=
msg"><br class=3D"gmail_msg"></div>

<p class=3D"gmail_msg"></p>

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.

Hi Ville,

Thanks a lot for the pointer! Whoa! This issue is ancient... I'll make sure the next version will have a reference to it and address the concerns it raises.

Cheers,

Alberto

> Il giorno 27 mar 2017, alle ore 23:02, Ville Voutilainen <ville.voutilainen@gmail.com> ha scritto:
>
>> On 27 March 2017 at 23:27, Alberto Barbati <albertobarbati@gmail.com> wrote:
>> Hello,
>>
>> this is a draft for a proposal to add a special meaning to the identifier __
>> (double underscore) so that it can be used (even repeatedly in the same
>> lexical scope) for all variables whose name is not important and that is no
>> longer needed after declaration. The draft includes a few examples.
>>
>> Is there any interest in this?
>
> There certainly is: http://cplusplus.github.io/EWG/ewg-active.html#35
>
> --
> You received this message because you are subscribed to a topic in the Google Groups "ISO C++ Standard - Future Proposals" group.
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.

> Il giorno 28 mar 2017, alle ore 07:39, Thiago Macieira <thiago@macieira.o=
rg> ha scritto:
>=20
> On segunda-feira, 27 de mar=C3=A7o de 2017 15:16:58 PDT 'Jeffrey Yasskin'=
 via ISO C
> ++ Standard - Future Proposals wrote:
>>> Just remember that there are already existing codebases using __ as
>>> identifier
>>> or macro names.
>>=20
>> They're not allowed. "_" is ok outside of the global namespace, but "__"=
 is
>> reserved by [lex.name].
>=20
> I know it is.
>=20
> And yet it's in use.
> https://github.com/v8/v8/blob/master/src/x64/codegen-x64.cc#L33

Thanks Thiago for the pointer. According to my (possibly incorrect) interpr=
etation this code raises undefined behavior because __ is reserved "for any=
 use", which I would expect includes the use as a macro name. I may be wron=
g, but I'd expect little sympathy in the committee about potentially breaki=
ng it. By the way, this code might possibly not break, because they were cl=
ever to put #undefs in it. Incidentally, the code would indeed break if we =
defined __ to be a macro...

Cheers,

Alberto

--=20
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ISO C++ Standard - Future Proposals" group.
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..

.

Em segunda-feira, 27 de mar=C3=A7o de 2017, =C3=A0s 23:47:55 PDT, Alberto B=
arbati=20
escreveu:
> > And yet it's in use.
> > https://github.com/v8/v8/blob/master/src/x64/codegen-x64.cc#L33
>=20
> Thanks Thiago for the pointer. According to my (possibly incorrect)
> interpretation this code raises undefined behavior because __ is reserved
> "for any use", which I would expect includes the use as a macro name. I m=
ay
> be wrong, but I'd expect little sympathy in the committee about potential=
ly
> breaking it. By the way, this code might possibly not break, because they
> were clever to put #undefs in it. Incidentally, the code would indeed bre=
ak
> if we defined __ to be a macro...

Right. We can say it's V8's own fault for using a reserved identifier. It's=
=20
like when Qt (qlalr) had an identifier called _Nullable, but that got=20
repurposed by a recent Clang change.

I'm just saying it's known to be in use in a fairly major project. You know=
,=20
the one that is behind Node.js and a whole ecosystem. The argument in the=
=20
paper that says it's little used is incorrect: it's not like pre-C++11 "aut=
o",=20
which had exactly one use in the entire Microsoft source code.

I guess we could convince GCC and Clang to print a warning about it if it=
=20
looks like this is going forward, so the V8 developers start fixing it. May=
be=20
we'll get some of these fixed too:

http://lxr.free-electrons.com/source/include/linux/compiler.h#L115
http://lxr.free-electrons.com/source/include/asm-generic/fixmap.h#L73

--=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

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.

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On Tue, Mar 28, 2017 at 8:22 AM, Alberto Barbati <albertobarbati@gmail.com>
wrote:

> Thanks a lot for the pointer! Whoa! This issue is ancient... I'll make
sure the next version will have a reference to it and address the concerns
it raises.

This keeps coming back to this forum. For example, this:
https://groups.google.com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/G8WC37LVAAAJ

My take on this is that we should have an operator or a keyword that
extends the lifetime of a temporary, as discussed here
https://groups.google.com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/bdUinF-3AQAJ
and
subsequent posts, notably this
https://groups.google.com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/bdUinF-3AQAJ
and this
https://groups.google.com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/5JrGmugAAgAJ

Cheers,
V.

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On T=
ue, Mar 28, 2017 at 8:22 AM, Alberto Barbati <span dir=3D"ltr">&lt;<a href=
=3D"mailto:albertobarbati@gmail.com" target=3D"_blank">albertobarbati@gmail=
..com</a>&gt;</span> wrote:<br><div><br></div><div>&gt; Thanks a lot for the=
 pointer! Whoa! This issue is ancient... I&#39;ll make sure the next versio=
n will have a reference to it and address the concerns it raises.</div><div=
><br></div><div>This keeps coming back to this forum. For example, this:=C2=
=A0<a href=3D"https://groups.google.com/a/isocpp.org/d/msg/std-proposals/io=
i76TkG6g4/G8WC37LVAAAJ">https://groups.google.com/a/isocpp.org/d/msg/std-pr=
oposals/ioi76TkG6g4/G8WC37LVAAAJ</a></div><div><br></div><div>My take on th=
is is that we should have an operator or a keyword that extends the lifetim=
e of a temporary, as discussed here <a href=3D"https://groups.google.com/a/=
isocpp.org/d/msg/std-proposals/ioi76TkG6g4/bdUinF-3AQAJ">https://groups.goo=
gle.com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/bdUinF-3AQAJ</a>=C2=A0=
and subsequent posts, notably this=C2=A0<a href=3D"https://groups.google.co=
m/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/bdUinF-3AQAJ">https://groups=
..google.com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/bdUinF-3AQAJ</a> a=
nd this=C2=A0<a href=3D"https://groups.google.com/a/isocpp.org/d/msg/std-pr=
oposals/ioi76TkG6g4/5JrGmugAAgAJ">https://groups.google.com/a/isocpp.org/d/=
msg/std-proposals/ioi76TkG6g4/5JrGmugAAgAJ</a></div><div><br></div><div>Che=
ers,</div><div>V.</div></div></div></div>

<p></p>

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Zd4OUgY3pHFyxNwg%40mail.gmail.com?utm_medium=3Demail&utm_source=3Dfooter">h=
ttps://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CAA7YVg1m%2BZHy=
DdVf6UCVL98Ne_FvGt6SMNZd4OUgY3pHFyxNwg%40mail.gmail.com</a>.<br />

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.

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2017-03-28 9:04 GMT+02:00 Thiago Macieira <thiago@macieira.org>:

> Em segunda-feira, 27 de mar=C3=A7o de 2017, =C3=A0s 23:47:55 PDT, Alberto=
 Barbati
> escreveu:
> > > And yet it's in use.
> > > https://github.com/v8/v8/blob/master/src/x64/codegen-x64.cc#L33
> >
> > Thanks Thiago for the pointer. According to my (possibly incorrect)
> > interpretation this code raises undefined behavior because __ is reserv=
ed
> > "for any use", which I would expect includes the use as a macro name. I
> may
> > be wrong, but I'd expect little sympathy in the committee about
> potentially
> > breaking it. By the way, this code might possibly not break, because th=
ey
> > were clever to put #undefs in it. Incidentally, the code would indeed
> break
> > if we defined __ to be a macro...
>
> Right. We can say it's V8's own fault for using a reserved identifier. It=
's
> like when Qt (qlalr) had an identifier called _Nullable, but that got
> repurposed by a recent Clang change.
>

In this particular instance, V8's programmer could and probably should have
used a non-reserved name (for example "m_" would have been a better choice
regardless). Even the choice of _Nullable was ill-conceived, since
identifiers beginning with an underscore and an uppercase letter are also
reserved.


> I'm just saying it's known to be in use in a fairly major project. You
> know,
> the one that is behind Node.js and a whole ecosystem. The argument in the
> paper that says it's little used is incorrect: it's not like pre-C++11
> "auto",
> which had exactly one use in the entire Microsoft source code.
>

I said that it's little used in the two librariesI have checked (VS2015 and
libc++). For user code such as this, all I said is that "the proposal
should not break code", which is correct: the identifier __ should not have
been used in the first place, so this is a case of code that someone might
say "deserves to be broken".


> I guess we could convince GCC and Clang to print a warning about it if it
> looks like this is going forward, so the V8 developers start fixing it.
> Maybe
> we'll get some of these fixed too:
>
> http://lxr.free-electrons.com/source/include/linux/compiler.h#L115
> http://lxr.free-electrons.com/source/include/asm-generic/fixmap.h#L73


The first one, that #defines "if", is particularly disturbing.

Cheers,

Alberto

--=20
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..org/d/msgid/std-proposals/CAF3xnJRtyCRSqc5dh7fpf1pSQem_Lw4SbePQxY3dBC_xEEi=
sEg%40mail.gmail.com.

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">2017=
-03-28 9:04 GMT+02:00 Thiago Macieira <span dir=3D"ltr">&lt;<a href=3D"mail=
to:thiago@macieira.org" target=3D"_blank">thiago@macieira.org</a>&gt;</span=
>:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l=
eft:1px #ccc solid;padding-left:1ex">Em segunda-feira, 27 de mar=C3=A7o de =
2017, =C3=A0s 23:47:55 PDT, Alberto Barbati<br>
escreveu:<br>
<span class=3D"">&gt; &gt; And yet it&#39;s in use.<br>
&gt; &gt; <a href=3D"https://github.com/v8/v8/blob/master/src/x64/codegen-x=
64.cc#L33" rel=3D"noreferrer" target=3D"_blank">https://github.com/v8/v8/bl=
ob/<wbr>master/src/x64/codegen-x64.cc#<wbr>L33</a><br>
&gt;<br>
&gt; Thanks Thiago for the pointer. According to my (possibly incorrect)<br=
>
&gt; interpretation this code raises undefined behavior because __ is reser=
ved<br>
&gt; &quot;for any use&quot;, which I would expect includes the use as a ma=
cro name. I may<br>
&gt; be wrong, but I&#39;d expect little sympathy in the committee about po=
tentially<br>
&gt; breaking it. By the way, this code might possibly not break, because t=
hey<br>
&gt; were clever to put #undefs in it. Incidentally, the code would indeed =
break<br>
&gt; if we defined __ to be a macro...<br>
<br>
</span>Right. We can say it&#39;s V8&#39;s own fault for using a reserved i=
dentifier. It&#39;s<br>
like when Qt (qlalr) had an identifier called _Nullable, but that got<br>
repurposed by a recent Clang change.<br></blockquote><div><br></div><div>In=
 this particular instance, V8&#39;s programmer could and probably should ha=
ve used a non-reserved name (for example &quot;m_&quot; would have been a b=
etter choice regardless). Even the choice of _Nullable was ill-conceived, s=
ince identifiers beginning with an underscore and an uppercase letter are a=
lso reserved.<br>=C2=A0<br></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I&#39;m just saying it&#39;s known to be in use in a fairly major project. =
You know,<br>
the one that is behind Node.js and a whole ecosystem. The argument in the<b=
r>
paper that says it&#39;s little used is incorrect: it&#39;s not like pre-C+=
+11 &quot;auto&quot;,<br>
which had exactly one use in the entire Microsoft source code.<br></blockqu=
ote><div><br></div><div>I said that it&#39;s little used in the two librari=
esI have checked (VS2015 and libc++). For user code such as this, all I sai=
d is that &quot;the proposal should not break code&quot;, which is correct:=
 the identifier __ should not have been used in the first place, so this is=
 a case of code that someone might say &quot;deserves to be broken&quot;.<b=
r>=C2=A0<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .=
8ex;border-left:1px #ccc solid;padding-left:1ex">
I guess we could convince GCC and Clang to print a warning about it if it<b=
r>
looks like this is going forward, so the V8 developers start fixing it. May=
be<br>
we&#39;ll get some of these fixed too:<br>
<br>
<a href=3D"http://lxr.free-electrons.com/source/include/linux/compiler.h#L1=
15" rel=3D"noreferrer" target=3D"_blank">http://lxr.free-electrons.com/<wbr=
>source/include/linux/compiler.<wbr>h#L115</a><br>
<a href=3D"http://lxr.free-electrons.com/source/include/asm-generic/fixmap.=
h#L73" rel=3D"noreferrer" target=3D"_blank">http://lxr.free-electrons.com/<=
wbr>source/include/asm-generic/<wbr>fixmap.h#L73</a></blockquote><div><br><=
/div><div>The first one, that #defines &quot;if&quot;, is particularly dist=
urbing.<br><br></div><div>Cheers,<br><br></div><div>Alberto<br></div></div>=
</div></div>

<p></p>

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2017-03-28 11:08 GMT+02:00 Viacheslav Usov <via.usov@gmail.com>:

> On Tue, Mar 28, 2017 at 8:22 AM, Alberto Barbati <albertobarbati@gmail.com
> > wrote:
>
> > Thanks a lot for the pointer! Whoa! This issue is ancient... I'll make
> sure the next version will have a reference to it and address the concerns
> it raises.
>
> This keeps coming back to this forum. For example, this:
> https://groups.google.com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/
> G8WC37LVAAAJ
>
> My take on this is that we should have an operator or a keyword that
> extends the lifetime of a temporary, as discussed here
> https://groups.google.com/a/isocpp.org/d/msg/std-
> proposals/ioi76TkG6g4/bdUinF-3AQAJ and subsequent posts, notably this
> https://groups.google.com/a/isocpp.org/d/msg/std-
> proposals/ioi76TkG6g4/bdUinF-3AQAJ and this https://groups.google.
> com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/5JrGmugAAgAJ
>

Thanks for taking the time to collect these links, I will have a look at
them.

As for having a keyword to extend the lifetime of a temporary, there is a
formal proposal for that (http://wg21.link/p0577), which I referenced in my
draft. However I believe P0577 does not address the issue of decomposition
declarations and has a greater syntactic cost (it re-uses the "register"
keyword). It's true that P0577 provides additional use cases, though, but I
am yet to be convinced of their usefulness.

Alberto

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">2017=
-03-28 11:08 GMT+02:00 Viacheslav Usov <span dir=3D"ltr">&lt;<a href=3D"mai=
lto:via.usov@gmail.com" target=3D"_blank">via.usov@gmail.com</a>&gt;</span>=
:<br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bo=
rder-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><di=
v class=3D"gmail_extra"><div class=3D"gmail_quote"><span class=3D"gmail-">O=
n Tue, Mar 28, 2017 at 8:22 AM, Alberto Barbati <span dir=3D"ltr">&lt;<a hr=
ef=3D"mailto:albertobarbati@gmail.com" target=3D"_blank">albertobarbati@gma=
il.com</a>&gt;</span> wrote:<br><div><br></div><div>&gt; Thanks a lot for t=
he pointer! Whoa! This issue is ancient... I&#39;ll make sure the next vers=
ion will have a reference to it and address the concerns it raises.</div><d=
iv><br></div></span><div>This keeps coming back to this forum. For example,=
 this:=C2=A0<a href=3D"https://groups.google.com/a/isocpp.org/d/msg/std-pro=
posals/ioi76TkG6g4/G8WC37LVAAAJ" target=3D"_blank">https://groups.google.<w=
br>com/a/isocpp.org/d/msg/std-<wbr>proposals/ioi76TkG6g4/<wbr>G8WC37LVAAAJ<=
/a></div><div><br></div><div>My take on this is that we should have an oper=
ator or a keyword that extends the lifetime of a temporary, as discussed he=
re <a href=3D"https://groups.google.com/a/isocpp.org/d/msg/std-proposals/io=
i76TkG6g4/bdUinF-3AQAJ" target=3D"_blank">https://groups.google.com/a/<wbr>=
isocpp.org/d/msg/std-<wbr>proposals/ioi76TkG6g4/bdUinF-<wbr>3AQAJ</a>=C2=A0=
and subsequent posts, notably this=C2=A0<a href=3D"https://groups.google.co=
m/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/bdUinF-3AQAJ" target=3D"_bla=
nk">https://groups.google.<wbr>com/a/isocpp.org/d/msg/std-<wbr>proposals/io=
i76TkG6g4/bdUinF-<wbr>3AQAJ</a> and this=C2=A0<a href=3D"https://groups.goo=
gle.com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/5JrGmugAAgAJ" target=
=3D"_blank">https://groups.google.<wbr>com/a/isocpp.org/d/msg/std-<wbr>prop=
osals/ioi76TkG6g4/<wbr>5JrGmugAAgAJ</a></div></div></div></div></blockquote=
><div><br></div><div>Thanks for taking the time to collect these links, I w=
ill have a look at them.<br><br></div><div>As for having a keyword to exten=
d the lifetime of a temporary, there is a formal proposal for that (<a href=
=3D"http://wg21.link/p0577">http://wg21.link/p0577</a>), which I referenced=
 in my draft. However I believe P0577 does not address the issue of decompo=
sition declarations and has a greater syntactic cost (it re-uses the &quot;=
register&quot; keyword). It&#39;s true that P0577 provides additional use c=
ases, though, but I am yet to be convinced of their usefulness.<br><br></di=
v><div>Alberto<br></div></div><br></div></div>

<p></p>

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--001a114e5364e385ce054bc704b2--

.

On 2017-03-28 05:23, Alberto Barbati wrote:
> 2017-03-28 11:08 GMT+02:00 Viacheslav Usov <via.usov@gmail.com>:
>> This keeps coming back to this forum. For example, this:
>> https://groups.google.com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/
>> G8WC37LVAAAJ
>>
>> My take on this is that we should have an operator or a keyword that
>> extends the lifetime of a temporary, as discussed here
>> https://groups.google.com/a/isocpp.org/d/msg/std-
>> proposals/ioi76TkG6g4/bdUinF-3AQAJ and subsequent posts, notably this
>> https://groups.google.com/a/isocpp.org/d/msg/std-
>> proposals/ioi76TkG6g4/bdUinF-3AQAJ and this https://groups.google.
>> com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/5JrGmugAAgAJ
>
> Thanks for taking the time to collect these links, I will have a look at
> them.
>
> As for having a keyword to extend the lifetime of a temporary, there is a
> formal proposal for that (http://wg21.link/p0577), which I referenced in my
> draft. However I believe P0577 does not address the issue of decomposition
> declarations and has a greater syntactic cost (it re-uses the "register"
> keyword). It's true that P0577 provides additional use cases, though, but I
> am yet to be convinced of their usefulness.

The main use case for `register` as lifetime extension is that you can
use it like:

  for (auto item : add_const(register make_list()))

....where you would otherwise need an additional declaration. The
decomposition case I think would be best solved by allowing empty and
nested declarations. See
https://groups.google.com/a/isocpp.org/d/msg/std-proposals/gg3_eUhCuqo/HcippDFiBgAJ
and following posts in the thread. This would let you write:

  auto [] = get_lock(); // no name
  auto [x, [], y] = get_tuple(); // middle element is unnamed
  auto [x, [a, b], y] = get_tuple(); // nested decomposition

Both solve the simple case, but both also have additional but
non-overlapping usefulness. I'm inclined to think that both are useful.

--
Matthew

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.

On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 02:09:54 PDT Alberto Barbati =
wrote:
> In this particular instance, V8's programmer could and probably should ha=
ve
> used a non-reserved name (for example "m_" would have been a better choic=
e
> regardless). Even the choice of _Nullable was ill-conceived, since
> identifiers beginning with an underscore and an uppercase letter are also
> reserved.

The reason for __ is that it looks unintrusive, which allows for code=20
generation in a way that is easy to read:

  // Fetch the instance type of the receiver into result register.
  __ movp(result, FieldOperand(string, HeapObject::kMapOffset));
  __ movzxbl(result, FieldOperand(result, Map::kInstanceTypeOffset));

  // We need special handling for indirect strings.
  Label check_sequential;
  __ testb(result, Immediate(kIsIndirectStringMask));
  __ j(zero, &check_sequential, Label::kNear);

--=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

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On Tue, Mar 28, 2017 at 4:23 AM, Alberto Barbati <albertobarbati@gmail.com>
wrote:

> However I believe P0577 does not address the issue of decomposition
> declaration


Because these two "use cases" imply different semantics.
When you write

  auto __ = lock_guard(m);

here you mean to *preserve* the result object, but when
you write

  auto [__, a] = get_tuple(...);

you mean to *ignore* a part of the result object, so
physically, just like std::ignore, I don't expect __ here
to issue a call to get(obj), nor an access to a subobject.
I don't think the *preserving* semantics can fulfill the
*ignoring* demand.

--
Zhihao Yuan, ID lichray
The best way to predict the future is to invent it.
___________________________________________________

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<div dir=3D"ltr"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
On Tue, Mar 28, 2017 at 4:23 AM, Alberto Barbati <span dir=3D"ltr">&lt;<a h=
ref=3D"mailto:albertobarbati@gmail.com" target=3D"_blank">albertobarbati@gm=
ail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D=
"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">However I b=
elieve P0577 does not address the issue of decomposition declaration </bloc=
kquote></div><br></div><div class=3D"gmail_extra">Because these two &quot;u=
se cases&quot; imply different semantics.<br></div><div class=3D"gmail_extr=
a">When you write<br><br></div><div class=3D"gmail_extra">=C2=A0 auto __ =
=3D lock_guard(m);<br><br></div><div class=3D"gmail_extra">here you mean to=
 *preserve* the result object, but when<br>you write<br><br></div><div clas=
s=3D"gmail_extra">=C2=A0 auto [__, a] =3D get_tuple(...);<br><br></div><div=
 class=3D"gmail_extra">you mean to *ignore* a part of the result object, so=
<br>physically, just like std::ignore, I don&#39;t expect __ here<br>to iss=
ue a call to get(obj), nor an access to a subobject.<br>I don&#39;t think t=
he *preserving* semantics can fulfill the<br>*ignoring* demand.<br></div><d=
iv class=3D"gmail_extra"><br>-- <br><div class=3D"gmail_signature" data-sma=
rtmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div>Zhih=
ao Yuan, ID lichray<br>The best way to predict the future is to invent it.<=
br>___________________________________________________<br></div></div></div=
></div></div>
</div></div>

<p></p>

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--f403045c31b0f377c1054bccef91--

.

--001a113d7eb483d313054bcd0857
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On Mon, Mar 27, 2017 at 3:27 PM, Alberto Barbati <albertobarbati@gmail.com>
wrote:

> Hello,
>
> this is a draft for a proposal to add a special meaning to the identifier
> __ (double underscore) so that it can be used (even repeatedly in the same
> lexical scope) for all variables whose name is not important and that is no
> longer needed after declaration. The draft includes a few examples.
>
> Is there any interest in this?
>
> Thanks in advance,
>
> Alberto
>
> --
> You received this message because you are subscribed to the Google Groups
> "ISO C++ Standard - Future Proposals" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to std-proposals+unsubscribe@isocpp.org.
> To post to this group, send email to std-proposals@isocpp.org.
> To view this discussion on the web visit https://groups.google.com/a/
> isocpp.org/d/msgid/std-proposals/985b9b2a-c734-45eb-
> 95f4-db4dc0d309a1%40isocpp.org
> <https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/985b9b2a-c734-45eb-95f4-db4dc0d309a1%40isocpp.org?utm_medium=email&utm_source=footer>
> .
>



Instead of __, I'd propose using ?. For example auto ? = scope_guard{...}.
? isn't allowed in identifiers so it shouldn't conflict with existing
nonconformant code. ? is also shorter :)

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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
On Mon, Mar 27, 2017 at 3:27 PM, Alberto Barbati <span dir=3D"ltr">&lt;<a h=
ref=3D"mailto:albertobarbati@gmail.com" target=3D"_blank">albertobarbati@gm=
ail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex"><div dir=3D"ltr">Hello,<br><br>this is a draft for a proposal to ad=
d a special meaning to the identifier __ (double underscore) so that it can=
 be used (even repeatedly in the same lexical scope) for all variables whos=
e name is not important and that is no longer needed after declaration. The=
 draft includes a few examples.<br><br>Is there any interest in this?<br><b=
r>Thanks in advance,<br><br>Alberto<span class=3D"gmail-HOEnZb"><font color=
=3D"#888888"><br><br></font></span></div><span class=3D"gmail-HOEnZb"><font=
 color=3D"#888888">

<p></p>

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blank">std-proposals+unsubscribe@<wbr>isocpp.org</a>.<br>
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..org" target=3D"_blank">std-proposals@isocpp.org</a>.<br>
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om/a/isocpp.org/d/msgid/std-proposals/985b9b2a-c734-45eb-95f4-db4dc0d309a1%=
40isocpp.org?utm_medium=3Demail&amp;utm_source=3Dfooter" target=3D"_blank">=
https://groups.google.com/a/<wbr>isocpp.org/d/msgid/std-<wbr>proposals/985b=
9b2a-c734-45eb-<wbr>95f4-db4dc0d309a1%40isocpp.org</a><wbr>.<br>
</font></span></blockquote></div></div><div class=3D"gmail_extra"><br></div=
><div class=3D"gmail_extra"><div><br></div><div><br></div><div>Instead of _=
_, I&#39;d propose using ?. For example auto ? =3D scope_guard{...}. ? isn&=
#39;t allowed in identifiers so it shouldn&#39;t conflict with existing non=
conformant code. ? is also shorter :)</div><div><br></div></div></div>

<p></p>

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aR1HfAzxcxXuvcv%2Bwg%40mail.gmail.com?utm_medium=3Demail&utm_source=3Dfoote=
r">https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CADbh%2BeSO=
tnM76_2-0kKo7U%2BDCK4Mt1uYaR1HfAzxcxXuvcv%2Bwg%40mail.gmail.com</a>.<br />

--001a113d7eb483d313054bcd0857--

.

On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 09:27:34 PDT Zhihao Yuan wrot=
e:
> here you mean to *preserve* the result object, but when
> you write
>=20
>   auto [__, a] =3D get_tuple(...);
>=20
> you mean to *ignore* a part of the result object, so
> physically, just like std::ignore, I don't expect __ here
> to issue a call to get(obj), nor an access to a subobject.
> I don't think the *preserving* semantics can fulfill the
> *ignoring* demand.

It has no difference, because the structured binding is actually a *binding=
*,=20
so there's difference to object creation or retention. The result from=20
get_tuple is assigned to an anonymous object and all its members are retain=
ed.=20
Then it's decomposed into two elements: an anonymous one (can't be accessed=
)=20
and a.

--=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

--=20
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On Tue, Mar 28, 2017 at 11:43 AM, Thiago Macieira <thiago@macieira.org>
wrote:

> just like std::ignore, I don't expect __ here
> > to issue a call to get(obj), nor an access to a subobject.
> > I don't think the *preserving* semantics can fulfill the
> > *ignoring* demand.
>
> It has no difference, because the structured binding is actually a
> *binding*,
> so there's difference to object creation or retention. The result from
> get_tuple is assigned to an anonymous object and all its members are
> retained.
> Then it's decomposed into two elements: an anonymous one (can't be
> accessed)
> and a.
>

Whether a call to get<0>(anon) being made
certainly has difference, because it can have
observable effect.  And, just like I showed
in a previous discussion, the purpose of the
anonymous object is for decomposition.  If
nothing is decomposition it, it needs not to be
created, therefore

  auto [__, __] = get_tuple(...);

should be physically equivalent to

  get_tuple(...);

thus, the result object is dropped on the floor.

--
Zhihao Yuan, ID lichray
The best way to predict the future is to invent it.
___________________________________________________

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<div dir=3D"ltr"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
On Tue, Mar 28, 2017 at 11:43 AM, Thiago Macieira <span dir=3D"ltr">&lt;<a =
href=3D"mailto:thiago@macieira.org" target=3D"_blank">thiago@macieira.org</=
a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0=
 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=3D"">jus=
t like std::ignore, I don&#39;t expect __ here<br>
&gt; to issue a call to get(obj), nor an access to a subobject.<br>
&gt; I don&#39;t think the *preserving* semantics can fulfill the<br>
&gt; *ignoring* demand.<br>
<br>
</span>It has no difference, because the structured binding is actually a *=
binding*,<br>
so there&#39;s difference to object creation or retention. The result from<=
br>
get_tuple is assigned to an anonymous object and all its members are retain=
ed.<br>
Then it&#39;s decomposed into two elements: an anonymous one (can&#39;t be =
accessed)<br>
and a.<br>
<span class=3D""></span></blockquote></div><br></div><div class=3D"gmail_ex=
tra">Whether a call to get&lt;0&gt;(anon) being made<br>certainly has diffe=
rence, because it can have<br>observable effect.=C2=A0 And, just like I sho=
wed<br></div><div class=3D"gmail_extra">in a previous discussion, the purpo=
se of the<br>anonymous object is for decomposition.=C2=A0 If<br>nothing is =
decomposition it, it needs not to be<br>created, therefore<br><br></div><di=
v class=3D"gmail_extra">=C2=A0 auto [__, __] =3D get_tuple(...);<br><br></d=
iv><div class=3D"gmail_extra">should be physically equivalent to<br><br></d=
iv><div class=3D"gmail_extra">=C2=A0 get_tuple(...);<br><br></div><div clas=
s=3D"gmail_extra">thus, the result object is dropped on the floor.<br clear=
=3D"all"></div><div class=3D"gmail_extra"><br>-- <br><div class=3D"gmail_si=
gnature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=
=3D"ltr"><div>Zhihao Yuan, ID lichray<br>The best way to predict the future=
 is to invent it.<br>___________________________________________________<br=
></div></div></div></div></div>
</div></div>

<p></p>

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.

On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 09:53:51 PDT Zhihao Yuan wrot=
e:
>   auto [__, __] =3D get_tuple(...);
>=20
> should be physically equivalent to
>=20
>   get_tuple(...);
>=20
> thus, the result object is dropped on the floor.

This should be equivalent to:

 auto __ =3D get_tuple(...);

--=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

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On Tue, Mar 28, 2017 at 7:03 PM, Thiago Macieira <thiago@macieira.org>
wrote:

> This should be equivalent to:

>        auto __ = get_tuple(...);

Which it is, if auto __ means either "DO retain the object" or "do NOT
retain the object"

Cheers,
V.

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On T=
ue, Mar 28, 2017 at 7:03 PM, Thiago Macieira <span dir=3D"ltr">&lt;<a href=
=3D"mailto:thiago@macieira.org" target=3D"_blank">thiago@macieira.org</a>&g=
t;</span> wrote:<br><div><br></div><div>&gt; This should be equivalent to:<=
/div><div><br></div><div>&gt; =C2=A0 =C2=A0 =C2=A0 =C2=A0auto __ =3D get_tu=
ple(...);</div><div><br></div><div>Which it is, if auto __ means either &qu=
ot;DO retain the object&quot; or &quot;do NOT retain the object&quot;=C2=A0=
</div><div><br></div><div>Cheers,</div><div>V.</div></div></div></div>

<p></p>

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On Tuesday, March 28, 2017 at 12:53:55 PM UTC-4, Zhihao Yuan wrote:
>
>
> On Tue, Mar 28, 2017 at 11:43 AM, Thiago Macieira <thi...@macieira.org
> <javascript:>> wrote:
>
>> just like std::ignore, I don't expect __ here
>> > to issue a call to get(obj), nor an access to a subobject.
>> > I don't think the *preserving* semantics can fulfill the
>> > *ignoring* demand.
>>
>> It has no difference, because the structured binding is actually a
>> *binding*,
>> so there's difference to object creation or retention. The result from
>> get_tuple is assigned to an anonymous object and all its members are
>> retained.
>> Then it's decomposed into two elements: an anonymous one (can't be
>> accessed)
>> and a.
>>
>
> Whether a call to get<0>(anon) being made
> certainly has difference, because it can have
> observable effect.  And, just like I showed
> in a previous discussion, the purpose of the
> anonymous object is for decomposition.  If
> nothing is decomposition it, it needs not to be
> created, therefore
>
>   auto [__, __] = get_tuple(...);
>
> should be physically equivalent to
>
>   get_tuple(...);
>
> thus, the result object is dropped on the floor.
>

No, it should not. It should create a hidden variable, initialize it with
the return value of the expression, then extract nothing from it. The
hidden variable will *always* be destroyed at the end of scope.

The behavior of `auto [name, __]` should not be substantially different
from that of `auto [__, __]`. What you're saying would violate that.

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<div dir=3D"ltr"><br><br>On Tuesday, March 28, 2017 at 12:53:55 PM UTC-4, Z=
hihao Yuan wrote:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margi=
n-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir=3D"l=
tr"><div><br><div class=3D"gmail_quote">On Tue, Mar 28, 2017 at 11:43 AM, T=
hiago Macieira <span dir=3D"ltr">&lt;<a href=3D"javascript:" target=3D"_bla=
nk" gdf-obfuscated-mailto=3D"yl9ZbfXDBwAJ" rel=3D"nofollow" onmousedown=3D"=
this.href=3D&#39;javascript:&#39;;return true;" onclick=3D"this.href=3D&#39=
;javascript:&#39;;return true;">thi...@macieira.org</a>&gt;</span> wrote:<b=
r><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:=
1px #ccc solid;padding-left:1ex"><span>just like std::ignore, I don&#39;t e=
xpect __ here<br>
&gt; to issue a call to get(obj), nor an access to a subobject.<br>
&gt; I don&#39;t think the *preserving* semantics can fulfill the<br>
&gt; *ignoring* demand.<br>
<br>
</span>It has no difference, because the structured binding is actually a *=
binding*,<br>
so there&#39;s difference to object creation or retention. The result from<=
br>
get_tuple is assigned to an anonymous object and all its members are retain=
ed.<br>
Then it&#39;s decomposed into two elements: an anonymous one (can&#39;t be =
accessed)<br>
and a.<br>
<span></span></blockquote></div><br></div><div>Whether a call to get&lt;0&g=
t;(anon) being made<br>certainly has difference, because it can have<br>obs=
ervable effect.=C2=A0 And, just like I showed<br></div><div>in a previous d=
iscussion, the purpose of the<br>anonymous object is for decomposition.=C2=
=A0 If<br>nothing is decomposition it, it needs not to be<br>created, there=
fore<br><br></div><div>=C2=A0 auto [__, __] =3D get_tuple(...);<br><br></di=
v><div>should be physically equivalent to<br><br></div><div>=C2=A0 get_tupl=
e(...);<br><br></div><div>thus, the result object is dropped on the floor.<=
br clear=3D"all"></div></div></blockquote><div><br>No, it should not. It sh=
ould create a hidden variable, initialize it with the return value of the e=
xpression, then extract nothing from it. The hidden variable will <i>always=
</i> be destroyed at the end of scope.<br><br>The behavior of `auto [name, =
__]` should not be substantially different from that of `auto [__, __]`. Wh=
at you&#39;re saying would violate that.<br></div></div>

<p></p>

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On Tue, Mar 28, 2017 at 1:39 AM, Thiago Macieira <thiago@macieira.org>
wrote:

> On segunda-feira, 27 de mar=C3=A7o de 2017 15:16:58 PDT 'Jeffrey Yasskin'=
 via
> ISO C
> ++ Standard - Future Proposals wrote:
> > > Just remember that there are already existing codebases using __ as
> > > identifier
> > > or macro names.
> >
> > They're not allowed. "_" is ok outside of the global namespace, but "__=
"
> is
> > reserved by [lex.name].
>
> I know it is.
>
> And yet it's in use.
> https://github.com/v8/v8/blob/master/src/x64/codegen-x64.cc#L33


If we are afraid to break people who use explicitly reserved identifiers,
then I think we'd be making a huge mistake. I agree that we should always
minimize breaking people when it makes sense and I know that people draw
the line at different places, but we should at least be able to make use of
an identifier that has been reserved since the initial standard.

--=20
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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On T=
ue, Mar 28, 2017 at 1:39 AM, Thiago Macieira <span dir=3D"ltr">&lt;<a href=
=3D"mailto:thiago@macieira.org" target=3D"_blank">thiago@macieira.org</a>&g=
t;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0=
 .8ex;border-left:1px #ccc solid;padding-left:1ex">On segunda-feira, 27 de =
mar=C3=A7o de 2017 15:16:58 PDT &#39;Jeffrey Yasskin&#39; via ISO C<br>
<span class=3D"">++ Standard - Future Proposals wrote:<br>
&gt; &gt; Just remember that there are already existing codebases using __ =
as<br>
&gt; &gt; identifier<br>
&gt; &gt; or macro names.<br>
&gt;<br>
&gt; They&#39;re not allowed. &quot;_&quot; is ok outside of the global nam=
espace, but &quot;__&quot; is<br>
&gt; reserved by [<a href=3D"http://lex.name" rel=3D"noreferrer" target=3D"=
_blank">lex.name</a>].<br>
<br>
</span>I know it is.<br>
<br>
And yet it&#39;s in use.<br>
<a href=3D"https://github.com/v8/v8/blob/master/src/x64/codegen-x64.cc#L33"=
 rel=3D"noreferrer" target=3D"_blank">https://github.com/v8/v8/blob/<wbr>ma=
ster/src/x64/codegen-x64.cc#<wbr>L33</a></blockquote><div><br></div><div>If=
 we are afraid to break people who use explicitly reserved identifiers, the=
n I think we&#39;d be making a huge mistake. I agree that we should always =
minimize breaking people when it makes sense and I know that people draw th=
e line at different places, but we should at least be able to make use of a=
n identifier that has been reserved since the initial standard.</div></div>=
</div></div>

<p></p>

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--94eb2c09351ab3efb7054bcdb14e--

.

On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 10:14:49 PDT Viacheslav Usov =
wrote:
> On Tue, Mar 28, 2017 at 7:03 PM, Thiago Macieira <thiago@macieira.org>
>=20
> wrote:
> > This should be equivalent to:
> >        auto __ =3D get_tuple(...);
>=20
> Which it is, if auto __ means either "DO retain the object" or "do NOT
> retain the object"

As proposed by the OP: exactly as that declaration would do today, except t=
hat=20
you can't access it anymore.

--=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

--=20
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..org/d/msgid/std-proposals/22600974.uQoRWN8BZc%40tjmaciei-mobl1.

.

On 2017-03-28 13:03, Thiago Macieira wrote:
> On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 09:53:51 PDT Zhihao Yuan wr=
ote:
>>   auto [__, __] =3D get_tuple(...);
>>
>> should be physically equivalent to
>>
>>   get_tuple(...);
>>
>> thus, the result object is dropped on the floor.
>=20
> This should be equivalent to:
>=20
>  auto __ =3D get_tuple(...);

I would argue it should be equivalent to:

  auto __magic__ =3D get_tuple(...); // note: same as today
  auto __ =3D get<0>(__magic__);
  auto __ =3D get<1>(__magic__);

....so that in case of side effects, there is no observable behavior
difference. (The compiler is free to elide bits of the above if there
are provably no side effects.)

This almost makes me think we need "unnamed" and "ignored" to be
implemented separately :'(...

--=20
Matthew

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On Tuesday, March 28, 2017 at 1:21:46 PM UTC-4, Matt Calabrese wrote:
>
> On Tue, Mar 28, 2017 at 1:39 AM, Thiago Macieira <thi...@macieira.org=20
> <javascript:>> wrote:
>
>> On segunda-feira, 27 de mar=C3=A7o de 2017 15:16:58 PDT 'Jeffrey Yasskin=
' via=20
>> ISO C
>> ++ Standard - Future Proposals wrote:
>> > > Just remember that there are already existing codebases using __ as
>> > > identifier
>> > > or macro names.
>> >
>> > They're not allowed. "_" is ok outside of the global namespace, but=20
>> "__" is
>> > reserved by [lex.name].
>>
>> I know it is.
>>
>> And yet it's in use.
>> https://github.com/v8/v8/blob/master/src/x64/codegen-x64.cc#L33
>
>
> If we are afraid to break people who use explicitly reserved identifiers,=
=20
> then I think we'd be making a huge mistake. I agree that we should always=
=20
> minimize breaking people when it makes sense and I know that people draw=
=20
> the line at different places, but we should at least be able to make use =
of=20
> an identifier that has been reserved since the initial standard.
>

I have to agree with that. This is literally the *whole point* of reserving=
=20
identifiers: so that we can use them later. It's not like adding a keyword,=
=20
where we need to study the impact of making a change so as to minimize=20
breakage.

If someone was using a reserved identifier (outside of a standard library=
=20
implementation), their code is wrong. We told them to stay out of this=20
area, and they didn't. Their code breaking is not our fault, nor is it on=
=20
us to stay out of their way.

Now, one thing that's important in this regard is that we should do a study=
=20
on the impact of this change on standard library implementations. Since we=
=20
would obviously be taking away one of their identifiers.

--=20
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..org/d/msgid/std-proposals/94be2101-d81a-4ea2-bc78-cddc33cad37e%40isocpp.or=
g.

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<div dir=3D"ltr">On Tuesday, March 28, 2017 at 1:21:46 PM UTC-4, Matt Calab=
rese wrote:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-left=
: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir=3D"ltr"><d=
iv><div class=3D"gmail_quote">On Tue, Mar 28, 2017 at 1:39 AM, Thiago Macie=
ira <span dir=3D"ltr">&lt;<a href=3D"javascript:" target=3D"_blank" gdf-obf=
uscated-mailto=3D"yhP7iXrFBwAJ" rel=3D"nofollow" onmousedown=3D"this.href=
=3D&#39;javascript:&#39;;return true;" onclick=3D"this.href=3D&#39;javascri=
pt:&#39;;return true;">thi...@macieira.org</a>&gt;</span> wrote:<br><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex">On segunda-feira, 27 de mar=C3=A7o de 2017 15:16:58=
 PDT &#39;Jeffrey Yasskin&#39; via ISO C<br>
<span>++ Standard - Future Proposals wrote:<br>
&gt; &gt; Just remember that there are already existing codebases using __ =
as<br>
&gt; &gt; identifier<br>
&gt; &gt; or macro names.<br>
&gt;<br>
&gt; They&#39;re not allowed. &quot;_&quot; is ok outside of the global nam=
espace, but &quot;__&quot; is<br>
&gt; reserved by [<a href=3D"http://lex.name" rel=3D"nofollow" target=3D"_b=
lank" onmousedown=3D"this.href=3D&#39;http://www.google.com/url?q\x3dhttp%3=
A%2F%2Flex.name\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNF_N3GW5zE1_7z8yWi02=
O4mJS2isg&#39;;return true;" onclick=3D"this.href=3D&#39;http://www.google.=
com/url?q\x3dhttp%3A%2F%2Flex.name\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCN=
F_N3GW5zE1_7z8yWi02O4mJS2isg&#39;;return true;">lex.name</a>].<br>
<br>
</span>I know it is.<br>
<br>
And yet it&#39;s in use.<br>
<a href=3D"https://github.com/v8/v8/blob/master/src/x64/codegen-x64.cc#L33"=
 rel=3D"nofollow" target=3D"_blank" onmousedown=3D"this.href=3D&#39;https:/=
/www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2Fv8%2Fv8%2Fblob%2Fmaster=
%2Fsrc%2Fx64%2Fcodegen-x64.cc%23L33\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjC=
NESmh4YdwRnNE1XxVxfhxmYsNRYPw&#39;;return true;" onclick=3D"this.href=3D&#3=
9;https://www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2Fv8%2Fv8%2Fblob=
%2Fmaster%2Fsrc%2Fx64%2Fcodegen-x64.cc%23L33\x26sa\x3dD\x26sntz\x3d1\x26usg=
\x3dAFQjCNESmh4YdwRnNE1XxVxfhxmYsNRYPw&#39;;return true;">https://github.co=
m/v8/v8/blob/<wbr>master/src/x64/codegen-x64.cc#<wbr>L33</a></blockquote><d=
iv><br></div><div>If we are afraid to break people who use explicitly reser=
ved identifiers, then I think we&#39;d be making a huge mistake. I agree th=
at we should always minimize breaking people when it makes sense and I know=
 that people draw the line at different places, but we should at least be a=
ble to make use of an identifier that has been reserved since the initial s=
tandard.</div></div></div></div></blockquote><div><br>I have to agree with =
that. This is literally the <i>whole point</i> of reserving identifiers: so=
 that we can use them later. It&#39;s not like adding a keyword, where we n=
eed to study the impact of making a change so as to minimize breakage.<br><=
br>If someone was using a reserved identifier (outside of a standard librar=
y implementation), their code is wrong. We told them to stay out of this ar=
ea, and they didn&#39;t. Their code breaking is not our fault, nor is it on=
 us to stay out of their way.<br><br>Now, one thing that&#39;s important in=
 this regard is that we should do a study on the impact of this change on s=
tandard library implementations. Since we would obviously be taking away on=
e of their identifiers.<br></div></div>

<p></p>

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com/a/isocpp.org/d/msgid/std-proposals/94be2101-d81a-4ea2-bc78-cddc33cad37e=
%40isocpp.org</a>.<br />

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On Tuesday, March 28, 2017 at 1:29:57 PM UTC-4, Matthew Woehlke wrote:
>
> On 2017-03-28 13:03, Thiago Macieira wrote:=20
> > On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 09:53:51 PDT Zhihao Yuan =
wrote:=20
> >>   auto [__, __] =3D get_tuple(...);=20
> >>=20
> >> should be physically equivalent to=20
> >>=20
> >>   get_tuple(...);=20
> >>=20
> >> thus, the result object is dropped on the floor.=20
> >=20
> > This should be equivalent to:=20
> >=20
> >         auto __ =3D get_tuple(...);=20
>
> I would argue it should be equivalent to:=20
>
>   auto __magic__ =3D get_tuple(...); // note: same as today=20
>   auto __ =3D get<0>(__magic__);=20
>   auto __ =3D get<1>(__magic__);=20
>
> ...so that in case of side effects, there is no observable behavior=20
> difference. (The compiler is free to elide bits of the above if there=20
> are provably no side effects.)=20
>
> This almost makes me think we need "unnamed" and "ignored" to be=20
> implemented separately :'(...
>

The question is this: will people actually want side effects of ignored=20
parameters? Or more to the point, why exactly would you want those side=20
effects?

I can't think of a case of a type that is decomposable where the=20
decomposition `get` function has side effects. Well, with one exception:=20
variant types. And the side effect there is that you get a thrown exception=
..

So it seems to me that if I have a variant, and I do:

auto [__, name] =3D expr;

I clearly don't want the side effect of calling `get<0>`. I'm declaring=20
very clearly that this variant is in state 1, and if it isn't, then throw.

So under what circumstances would a user want the side effect of `get` but=
=20
not the name? We shouldn't add such a feature based on whether someone=20
could use it. We should add the feature because someone has a genuine need=
=20
to use it.

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<div dir=3D"ltr">On Tuesday, March 28, 2017 at 1:29:57 PM UTC-4, Matthew Wo=
ehlke wrote:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-lef=
t: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">On 2017-03-28 13:0=
3, Thiago Macieira wrote:
<br>&gt; On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 09:53:51 PDT Zhihao =
Yuan wrote:
<br>&gt;&gt; =C2=A0 auto [__, __] =3D get_tuple(...);
<br>&gt;&gt;
<br>&gt;&gt; should be physically equivalent to
<br>&gt;&gt;
<br>&gt;&gt; =C2=A0 get_tuple(...);
<br>&gt;&gt;
<br>&gt;&gt; thus, the result object is dropped on the floor.
<br>&gt;=20
<br>&gt; This should be equivalent to:
<br>&gt;=20
<br>&gt; =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0auto __ =3D get_tu=
ple(...);
<br>
<br>I would argue it should be equivalent to:
<br>
<br>=C2=A0 auto __magic__ =3D get_tuple(...); // note: same as today
<br>=C2=A0 auto __ =3D get&lt;0&gt;(__magic__);
<br>=C2=A0 auto __ =3D get&lt;1&gt;(__magic__);
<br>
<br>...so that in case of side effects, there is no observable behavior
<br>difference. (The compiler is free to elide bits of the above if there
<br>are provably no side effects.)
<br>
<br>This almost makes me think we need &quot;unnamed&quot; and &quot;ignore=
d&quot; to be
<br>implemented separately :&#39;(...<br></blockquote><div><br>The question=
 is this: will people actually want side effects of ignored parameters? Or =
more to the point, why exactly would you want those side effects?<br><br>I =
can&#39;t think of a case of a type that is decomposable where the decompos=
ition `get` function has side effects. Well, with one exception: variant ty=
pes. And the side effect there is that you get a thrown exception.<br><br>S=
o it seems to me that if I have a variant, and I do:<br><br><div style=3D"b=
ackground-color: rgb(250, 250, 250); border-color: rgb(187, 187, 187); bord=
er-style: solid; border-width: 1px; overflow-wrap: break-word;" class=3D"pr=
ettyprint"><code class=3D"prettyprint"><div class=3D"subprettyprint"><span =
style=3D"color: #008;" class=3D"styled-by-prettify">auto</span><span style=
=3D"color: #000;" class=3D"styled-by-prettify"> </span><span style=3D"color=
: #660;" class=3D"styled-by-prettify">[</span><span style=3D"color: #000;" =
class=3D"styled-by-prettify">__</span><span style=3D"color: #660;" class=3D=
"styled-by-prettify">,</span><span style=3D"color: #000;" class=3D"styled-b=
y-prettify"> name</span><span style=3D"color: #660;" class=3D"styled-by-pre=
ttify">]</span><span style=3D"color: #000;" class=3D"styled-by-prettify"> <=
/span><span style=3D"color: #660;" class=3D"styled-by-prettify">=3D</span><=
span style=3D"color: #000;" class=3D"styled-by-prettify"> expr</span><span =
style=3D"color: #660;" class=3D"styled-by-prettify">;</span><span style=3D"=
color: #000;" class=3D"styled-by-prettify"><br></span></div></code></div><b=
r>I clearly don&#39;t want the side effect of calling `get&lt;0&gt;`. I&#39=
;m declaring very clearly that this variant is in state 1, and if it isn&#3=
9;t, then throw.<br><br>So under what circumstances would a user want the s=
ide effect of `get` but not the name? We shouldn&#39;t add such a feature b=
ased on whether someone could use it. We should add the feature because som=
eone has a genuine need to use it.<br></div></div>

<p></p>

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On Tue, Mar 28, 2017 at 7:29 PM, Thiago Macieira <thiago@macieira.org>
wrote:

> As proposed by the OP: exactly as that declaration would do today

Which is UB.

Cheers,
V.

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On T=
ue, Mar 28, 2017 at 7:29 PM, Thiago Macieira <span dir=3D"ltr">&lt;<a href=
=3D"mailto:thiago@macieira.org" target=3D"_blank">thiago@macieira.org</a>&g=
t;</span> wrote:<br><div><br></div><div>&gt; As proposed by the OP: exactly=
 as that declaration would do today</div><div><br></div><div>Which is UB.</=
div><div><br></div><div>Cheers,</div><div>V.</div></div></div></div>

<p></p>

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qbuLxgw8ikeRUmHg%40mail.gmail.com?utm_medium=3Demail&utm_source=3Dfooter">h=
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Ew_Y5%2BTCwD2SW0nXMcSEqbuLxgw8ikeRUmHg%40mail.gmail.com</a>.<br />

--94eb2c070e9881891c054bcdf872--

.

On 2017-03-28 13:39, Nicol Bolas wrote:
> On Tuesday, March 28, 2017 at 1:29:57 PM UTC-4, Matthew Woehlke wrote:
>> On 2017-03-28 13:03, Thiago Macieira wrote:=20
>>> On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 09:53:51 PDT Zhihao Yuan =
wrote:=20
>>>>   auto [__, __] =3D get_tuple(...);=20
>>>>
>>>> should be physically equivalent to=20
>>>>
>>>>   get_tuple(...);=20
>>>>
>>>> thus, the result object is dropped on the floor.=20
>>>
>>> This should be equivalent to:=20
>>>
>>>         auto __ =3D get_tuple(...);=20
>>
>> I would argue it should be equivalent to:=20
>>
>>   auto __magic__ =3D get_tuple(...); // note: same as today=20
>>   auto __ =3D get<0>(__magic__);=20
>>   auto __ =3D get<1>(__magic__);=20
>=20
> The question is this: will people actually want side effects of ignored=
=20
> parameters? Or more to the point, why exactly would you want those side=
=20
> effects?

Consistency?

  // Same? Uh... no?
  auto __ =3D expr;
  auto [__] =3D expr;

  // Same? I hope so?
  auto [__] =3D expr;
  auto x =3D expr; auto __ =3D get<0>(x);

  // Same? Better be!
  auto [y] =3D expr;
  auto x =3D expr; auto y =3D get<0>(x);

--=20
Matthew

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.

On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 09:53:51 PDT Zhihao Yuan wrot=
e:
> Whether a call to get<0>(anon) being made
> certainly has difference, because it can have
> observable effect.

It does not, so it cannot have an observable effect.

--=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

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.

On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 10:31:27 PDT Nicol Bolas wrot=
e:
> If someone was using a reserved identifier (outside of a standard library
> implementation), their code is wrong. We told them to stay out of this
> area, and they didn't. Their code breaking is not our fault, nor is it on
> us to stay out of their way.
>=20
> Now, one thing that's important in this regard is that we should do a stu=
dy
> on the impact of this change on standard library implementations. Since w=
e
> would obviously be taking away one of their identifiers.

I'm not saying we should avoid __.

I'm saying that the paper needs to be updated to indicate that the reserved=
=20
identifier is used and therefore we know we will cause breakage, regardless=
 of=20
who is to blame.

--=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

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> Il giorno 28 mar 2017, alle ore 18:16, Thiago Macieira <thiago@macieira.o=
rg> ha scritto:
>=20
>> On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 02:09:54 PDT Alberto Barba=
ti wrote:
>> In this particular instance, V8's programmer could and probably should h=
ave
>> used a non-reserved name (for example "m_" would have been a better choi=
ce
>> regardless). Even the choice of _Nullable was ill-conceived, since
>> identifiers beginning with an underscore and an uppercase letter are als=
o
>> reserved.
>=20
> The reason for __ is that it looks unintrusive, which allows for code=20
> generation in a way that is easy to read:
>=20
>  // Fetch the instance type of the receiver into result register.
>  __ movp(result, FieldOperand(string, HeapObject::kMapOffset));
>  __ movzxbl(result, FieldOperand(result, Map::kInstanceTypeOffset));

I don't see it much easier to read than:

    m_ movp(result, FieldOperand(string, HeapObject::kMapOffset));
    m_ movzxbl(result, FieldOperand(result, Map::kInstanceTypeOffset));

especially when the macro m_ expands to some variation of "masm". Just my o=
pinion.

A.

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=
=3Dutf-8"></head><body dir=3D"auto"><div></div><div><br></div><div>Il giorn=
o 28 mar 2017, alle ore 18:16, Thiago Macieira &lt;<a href=3D"mailto:thiago=
@macieira.org">thiago@macieira.org</a>&gt; ha scritto:<br><br></div><blockq=
uote type=3D"cite"><div><span>On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017=
 02:09:54 PDT Alberto Barbati wrote:</span><br><blockquote type=3D"cite"><s=
pan>In this particular instance, V8's programmer could and probably should =
have</span><br></blockquote><blockquote type=3D"cite"><span>used a non-rese=
rved name (for example "m_" would have been a better choice</span><br></blo=
ckquote><blockquote type=3D"cite"><span>regardless). Even the choice of _Nu=
llable was ill-conceived, since</span><br></blockquote><blockquote type=3D"=
cite"><span>identifiers beginning with an underscore and an uppercase lette=
r are also</span><br></blockquote><blockquote type=3D"cite"><span>reserved.=
</span><br></blockquote><span></span><br><span>The reason for __ is that it=
 looks unintrusive, which allows for code </span><br><span>generation in a =
way that is easy to read:</span><br><span></span><br><span> &nbsp;// Fetch =
the instance type of the receiver into result register.</span><br><span> &n=
bsp;__ movp(result, FieldOperand(string, HeapObject::kMapOffset));</span><b=
r><span> &nbsp;__ movzxbl(result, FieldOperand(result, Map::kInstanceTypeOf=
fset));</span><br></div></blockquote><div><br></div>I don't see it much eas=
ier to read than:<div><span style=3D"background-color: rgba(255, 255, 255, =
0);"><br></span></div><div><span style=3D"background-color: rgba(255, 255, =
255, 0);">&nbsp; &nbsp; m_ movp(result, FieldOperand(string, HeapObject::kM=
apOffset));</span></div><div><div><font color=3D"#000000"><span style=3D"ba=
ckground-color: rgba(255, 255, 255, 0);">&nbsp; &nbsp; m_ movzxbl(result, F=
ieldOperand(result, Map::kInstanceTypeOffset));</span></font></div><div><fo=
nt color=3D"#000000"><span style=3D"background-color: rgba(255, 255, 255, 0=
);"><br></span></font></div><div><font color=3D"#000000"><span style=3D"bac=
kground-color: rgba(255, 255, 255, 0);">especially when the macro m_ expand=
s to some variation of "masm". Just my opinion.</span></font></div><div><fo=
nt color=3D"#000000"><span style=3D"background-color: rgba(255, 255, 255, 0=
);"><br></span></font></div><div><font color=3D"#000000"><span style=3D"bac=
kground-color: rgba(255, 255, 255, 0);">A.</span></font></div><blockquote t=
ype=3D"cite"><div><span></span></div></blockquote></div></body></html>

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> Il giorno 28 mar 2017, alle ore 18:27, Zhihao Yuan <zy@miator.net> ha scr=
itto:
>=20
>=20
>> On Tue, Mar 28, 2017 at 4:23 AM, Alberto Barbati <albertobarbati@gmail.c=
om> wrote:
>> However I believe P0577 does not address the issue of decomposition decl=
aration
>=20
> Because these two "use cases" imply different semantics.
> When you write
>=20
>   auto __ =3D lock_guard(m);
>=20
> here you mean to *preserve* the result object, but when
> you write
>=20
>   auto [__, a] =3D get_tuple(...);
>=20
> you mean to *ignore* a part of the result object, so
> physically, just like std::ignore, I don't expect __ here
> to issue a call to get(obj), nor an access to a subobject.
> I don't think the *preserving* semantics can fulfill the
> *ignoring* demand.

I see it differently. For me, those two are instances of the same use case:=
 "I don't care about the name, since I don't need to refer to this lvalue a=
nymore". In the first case we are not actually "preserving" anything, since=
 we are declaring an object whose lifetime would end at the end of the lexi=
cal scope regardless of its name. Similarly in the second case, with the on=
ly difference that the name would be bound to a reference to a subobject of=
 an object whose scope is defined irrespective of the binding. In this case=
 the compiler can and probably would omit the binding without observable ef=
fects.

Cheers,

Alberto

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=
=3Dutf-8"></head><body dir=3D"auto"><div></div><div><br></div><div>Il giorn=
o 28 mar 2017, alle ore 18:27, Zhihao Yuan &lt;<a href=3D"mailto:zy@miator.=
net">zy@miator.net</a>&gt; ha scritto:<br><br></div><blockquote type=3D"cit=
e"><div><div dir=3D"ltr"><div class=3D"gmail_extra"><br><div class=3D"gmail=
_quote">On Tue, Mar 28, 2017 at 4:23 AM, Alberto Barbati <span dir=3D"ltr">=
&lt;<a href=3D"mailto:albertobarbati@gmail.com" target=3D"_blank">albertoba=
rbati@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" =
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">How=
ever I believe P0577 does not address the issue of decomposition declaratio=
n </blockquote></div><br></div><div class=3D"gmail_extra">Because these two=
 "use cases" imply different semantics.<br></div><div class=3D"gmail_extra"=
>When you write<br><br></div><div class=3D"gmail_extra">&nbsp; auto __ =3D =
lock_guard(m);<br><br></div><div class=3D"gmail_extra">here you mean to *pr=
eserve* the result object, but when<br>you write<br><br></div><div class=3D=
"gmail_extra">&nbsp; auto [__, a] =3D get_tuple(...);<br><br></div><div cla=
ss=3D"gmail_extra">you mean to *ignore* a part of the result object, so<br>=
physically, just like std::ignore, I don't expect __ here<br>to issue a cal=
l to get(obj), nor an access to a subobject.<br>I don't think the *preservi=
ng* semantics can fulfill the<br>*ignoring* demand.</div></div>
</div></blockquote><br><div>I see it differently. For me, those two are ins=
tances of the same use case: "I don't care about the name, since I don't ne=
ed to refer to this lvalue anymore". In the first case we are not actually =
"preserving" anything, since we are declaring an object whose lifetime woul=
d end at the end of the lexical scope regardless of its name. Similarly in =
the second case, with the only difference that the name would be bound to a=
 reference to a subobject of an object whose scope is defined irrespective =
of the binding. In this case the compiler can and probably would omit the b=
inding without observable effects.</div><div><br></div><div>Cheers,</div><d=
iv><br></div><div>Alberto</div></body></html>

<p></p>

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.

> Il giorno 28 mar 2017, alle ore 19:29, Thiago Macieira <thiago@macieira.o=
rg> ha scritto:
>=20
>> On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 10:14:49 PDT Viacheslav Us=
ov wrote:
>> On Tue, Mar 28, 2017 at 7:03 PM, Thiago Macieira <thiago@macieira.org>
>>=20
>> wrote:
>>> This should be equivalent to:
>>>       auto __ =3D get_tuple(...);
>>=20
>> Which it is, if auto __ means either "DO retain the object" or "do NOT
>> retain the object"
>=20
> As proposed by the OP: exactly as that declaration would do today, except=
 that=20
> you can't access it anymore.

Precisely. There's no "retain" or "not retain" added semantic, as I explain=
ed in another post.

Alberto

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> Il giorno 28 mar 2017, alle ore 19:41, Viacheslav Usov <via.usov@gmail.com> ha scritto:
>
> On Tue, Mar 28, 2017 at 7:29 PM, Thiago Macieira <thiago@macieira.org> wrote:
>
> > As proposed by the OP: exactly as that declaration would do today
>
> Which is UB.
>

Care to explain? I can't see UB there.

Cheers,

Alberto

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=
=3Dutf-8"></head><body dir=3D"auto"><div></div><div><br></div><div><br>Il g=
iorno 28 mar 2017, alle ore 19:41, Viacheslav Usov &lt;<a href=3D"mailto:vi=
a.usov@gmail.com">via.usov@gmail.com</a>&gt; ha scritto:<br><br></div><bloc=
kquote type=3D"cite"><div><div dir=3D"ltr"><div class=3D"gmail_extra"><div =
class=3D"gmail_quote">On Tue, Mar 28, 2017 at 7:29 PM, Thiago Macieira <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:thiago@macieira.org" target=3D"_blank">=
thiago@macieira.org</a>&gt;</span> wrote:<br><div><br></div><div>&gt; As pr=
oposed by the OP: exactly as that declaration would do today</div><div><br>=
</div><div>Which is UB.</div><div><br></div></div></div></div>
</div></blockquote><br><div>Care to explain? I can't see UB there.</div><di=
v><br></div><div>Cheers,</div><div><br></div><div>Alberto</div></body></htm=
l>

<p></p>

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On Tue, Mar 28, 2017 at 10:53 PM, Alberto Barbati <albertobarbati@gmail.com>
wrote:

> Care to explain? I can't see UB there.

[lex.name]/3 "In addition, some identifiers are reserved for use by C++
implementations and shall not be used otherwise; no diagnostic is required."

No behavior is imposed by the International Standard, hence
[defns.undefined] applies.

Cheers,
V.

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On T=
ue, Mar 28, 2017 at 10:53 PM, Alberto Barbati <span dir=3D"ltr">&lt;<a href=
=3D"mailto:albertobarbati@gmail.com" target=3D"_blank">albertobarbati@gmail=
..com</a>&gt;</span> wrote:<br><div><br></div><div>&gt; Care to explain? I c=
an&#39;t see UB there.</div><div><br></div><div>[<a href=3D"http://lex.name=
">lex.name</a>]/3 &quot;In addition, some identifiers are reserved for use =
by C++ implementations and shall not be used otherwise;
no diagnostic is required.&quot;</div><div><br></div><div>No=C2=A0behavior =
is imposed by the International Standard, hence [defns.undefined] applies.<=
/div><div><br></div><div>Cheers,</div><div>V.</div><div><br></div></div></d=
iv></div>

<p></p>

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> Il giorno 28 mar 2017, alle ore 23:09, Viacheslav Usov <via.usov@gmail.com> ha scritto:
>
> On Tue, Mar 28, 2017 at 10:53 PM, Alberto Barbati <albertobarbati@gmail.com> wrote:
>
> > Care to explain? I can't see UB there.
>
> [lex.name]/3 "In addition, some identifiers are reserved for use by C++ implementations and shall not be used otherwise; no diagnostic is required."
>
> No behavior is imposed by the International Standard, hence [defns.undefined] applies.

Well... the starting point of the whole discussion is that my proposal would allow the use of __ in user code...

Alberto

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=
=3Dutf-8"></head><body dir=3D"auto"><div></div><div><br></div><div>Il giorn=
o 28 mar 2017, alle ore 23:09, Viacheslav Usov &lt;<a href=3D"mailto:via.us=
ov@gmail.com">via.usov@gmail.com</a>&gt; ha scritto:<br><br></div><blockquo=
te type=3D"cite"><div>On Tue, Mar 28, 2017 at 10:53 PM, Alberto Barbati <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:albertobarbati@gmail.com" target=3D"_b=
lank">albertobarbati@gmail.com</a>&gt;</span> wrote:<br><div><br></div><div=
>&gt; Care to explain? I can't see UB there.</div><div><br></div><div>[<a h=
ref=3D"http://lex.name">lex.name</a>]/3 "In addition, some identifiers are =
reserved for use by C++ implementations and shall not be used otherwise;
no diagnostic is required."</div><div><br></div><div>No&nbsp;behavior is im=
posed by the International Standard, hence [defns.undefined] applies.</div>=
</div></blockquote><br><div>Well... the starting point of the whole discuss=
ion is that my proposal would allow the use of __ in user code...</div><div=
><br></div><div>Alberto</div><div><br></div></body></html>

<p></p>

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On Tue, Mar 28, 2017 at 11:15 PM, Alberto Barbati <albertobarbati@gmail.com>
wrote:

> Well... the starting point of the whole discussion is that my proposal
would allow the use of __ in user code...

I responded to this: "As proposed by the OP: exactly as that declaration
would do today".

Today, this is UB, per the standard.

Cheers,
V.

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On T=
ue, Mar 28, 2017 at 11:15 PM, Alberto Barbati <span dir=3D"ltr">&lt;<a href=
=3D"mailto:albertobarbati@gmail.com" target=3D"_blank">albertobarbati@gmail=
..com</a>&gt;</span> wrote:</div><div class=3D"gmail_quote"><br></div><div c=
lass=3D"gmail_quote">&gt; Well... the starting point of the whole discussio=
n is that my proposal would allow the use of __ in user code...</div><div c=
lass=3D"gmail_quote"><br></div><div class=3D"gmail_quote">I responded to th=
is: &quot;<span style=3D"font-size:12.8px">As proposed by the OP: exactly a=
s that declaration would do today&quot;.</span></div><div class=3D"gmail_qu=
ote"><span style=3D"font-size:12.8px"><br></span></div><div class=3D"gmail_=
quote"><span style=3D"font-size:12.8px">Today, this is UB, per the standard=
..</span></div><div class=3D"gmail_quote"><span style=3D"font-size:12.8px"><=
br></span></div><div class=3D"gmail_quote"><span style=3D"font-size:12.8px"=
>Cheers,</span></div><div class=3D"gmail_quote"><span style=3D"font-size:12=
..8px">V.</span></div></div></div>

<p></p>

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.

On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 14:46:13 PDT Viacheslav Usov =
wrote:
> I responded to this: "As proposed by the OP: exactly as that declaration
> would do today".
>=20
> Today, this is UB, per the standard.

Ok, so amending: exactly as it is doing today in compilers that don't enfor=
ce=20
that __ is a reserved identifier.

--=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

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.

On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 13:27:25 PDT Alberto Barbati =
wrote:
> > // Fetch the instance type of the receiver into result register.
> > __ movp(result, FieldOperand(string, HeapObject::kMapOffset));
> > __ movzxbl(result, FieldOperand(result, Map::kInstanceTypeOffset));
>=20
> I don't see it much easier to read than:
>=20
>     m_ movp(result, FieldOperand(string, HeapObject::kMapOffset));
>     m_ movzxbl(result, FieldOperand(result, Map::kInstanceTypeOffset));
>=20
> especially when the macro m_ expands to some variation of "masm". Just my
> opinion.

It does to me, because the space is not as visible, so my first glance was=
=20
"m_movp", which is not at all what was meant.

--=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

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On Tuesday, March 28, 2017 at 9:55:54 PM UTC+8, Matthew Woehlke wrote:
>
> The decomposition case I think would be best solved by allowing empty and
> nested declarations. See
>
> https://groups.google.com/a/isocpp.org/d/msg/std-proposals/gg3_eUhCuqo/HcippDFiBgAJ
> and following posts in the thread. This would let you write:
>
>   auto [] = get_lock(); // no name
>   auto [x, [], y] = get_tuple(); // middle element is unnamed
>   auto [x, [a, b], y] = get_tuple(); // nested decomposition
>
> Both solve the simple case, but both also have additional but
> non-overlapping usefulness. I'm inclined to think that both are useful.
>

While I like the idea, but compilers probably don't. In the following
example:
auto [[a, b], c] = get_tuple();

"[["conflicts with the attribute syntax.

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<div dir=3D"ltr">On Tuesday, March 28, 2017 at 9:55:54 PM UTC+8, Matthew Wo=
ehlke wrote:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-lef=
t: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">The
decomposition case I think would be best solved by allowing empty and
<br>nested declarations. See
<br><a href=3D"https://groups.google.com/a/isocpp.org/d/msg/std-proposals/g=
g3_eUhCuqo/HcippDFiBgAJ" target=3D"_blank" rel=3D"nofollow" onmousedown=3D"=
this.href=3D&#39;https://groups.google.com/a/isocpp.org/d/msg/std-proposals=
/gg3_eUhCuqo/HcippDFiBgAJ&#39;;return true;" onclick=3D"this.href=3D&#39;ht=
tps://groups.google.com/a/isocpp.org/d/msg/std-proposals/gg3_eUhCuqo/HcippD=
FiBgAJ&#39;;return true;">https://groups.google.com/a/<wbr>isocpp.org/d/msg=
/std-<wbr>proposals/gg3_eUhCuqo/<wbr>HcippDFiBgAJ</a>
<br>and following posts in the thread. This would let you write:
<br>
<br>=C2=A0 auto [] =3D get_lock(); // no name
<br>=C2=A0 auto [x, [], y] =3D get_tuple(); // middle element is unnamed
<br>=C2=A0 auto [x, [a, b], y] =3D get_tuple(); // nested decomposition
<br>
<br>Both solve the simple case, but both also have additional but
<br>non-overlapping usefulness. I&#39;m inclined to think that both are use=
ful.
<br></blockquote><div><br></div><div>While I like the idea, but compilers p=
robably don&#39;t. In the following example:</div><div><div class=3D"pretty=
print" style=3D"background-color: rgb(250, 250, 250); border-color: rgb(187=
, 187, 187); border-style: solid; border-width: 1px; word-wrap: break-word;=
"><code class=3D"prettyprint"><div class=3D"subprettyprint"><span style=3D"=
color: #008;" class=3D"styled-by-prettify">auto</span><span style=3D"color:=
 #000;" class=3D"styled-by-prettify"> </span><span style=3D"color: #660;" c=
lass=3D"styled-by-prettify">[[</span><span style=3D"color: #000;" class=3D"=
styled-by-prettify">a</span><span style=3D"color: #660;" class=3D"styled-by=
-prettify">,</span><span style=3D"color: #000;" class=3D"styled-by-prettify=
"> b</span><span style=3D"color: #660;" class=3D"styled-by-prettify">],</sp=
an><span style=3D"color: #000;" class=3D"styled-by-prettify"> c</span><span=
 style=3D"color: #660;" class=3D"styled-by-prettify">]</span><span style=3D=
"color: #000;" class=3D"styled-by-prettify"> </span><span style=3D"color: #=
660;" class=3D"styled-by-prettify">=3D</span><span style=3D"color: #000;" c=
lass=3D"styled-by-prettify"> </span><span style=3D"color: #000;" class=3D"s=
tyled-by-prettify">get_tuple</span><span style=3D"color: #660;" class=3D"st=
yled-by-prettify">();</span></div></code></div><br></div><div>&quot;[[&quot=
;conflicts with the attribute syntax.</div></div>

<p></p>

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On Wednesday, March 29, 2017 at 12:34:29 AM UTC+8, Brittany Friedman wrote:
>
> Instead of __, I'd propose using ?. For example auto ? = scope_guard{...}.
> ? isn't allowed in identifiers so it shouldn't conflict with existing
> nonconformant code. ? is also shorter :)
>

You get my support :)
FWIW, I have developed a "template declname parameter
<https://www.reddit.com/r/cpp/comments/61r0qf/rfc_template_declname_parameter_and/>"
feature which also uses `?` to represent "unnamed".
That said, for lifetime extension, I'd prefer p0577 <http://wg21.link/p0577>
..

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<div dir=3D"ltr">On Wednesday, March 29, 2017 at 12:34:29 AM UTC+8, Brittan=
y Friedman wrote:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margi=
n-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir=3D"l=
tr"><div><div>Instead of __, I&#39;d propose using ?. For example auto ? =
=3D scope_guard{...}. ? isn&#39;t allowed in identifiers so it shouldn&#39;=
t conflict with existing nonconformant code. ? is also shorter :)</div></di=
v></div></blockquote><div><br></div><div>You get my support :)</div><div>FW=
IW, I have developed a &quot;<a href=3D"https://www.reddit.com/r/cpp/commen=
ts/61r0qf/rfc_template_declname_parameter_and/">template declname parameter=
</a>&quot; feature which also uses `?` to represent &quot;unnamed&quot;.</d=
iv><div>That said, for lifetime extension, I&#39;d prefer=C2=A0<a href=3D"h=
ttp://wg21.link/p0577">p0577</a>.</div></div>

<p></p>

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On Tue, Mar 28, 2017 at 10:52 AM Thiago Macieira <thiago@macieira.org>
wrote:

> On ter=C3=A7a-feira, 28 de mar=C3=A7o de 2017 09:53:51 PDT Zhihao Yuan wr=
ote:
> > Whether a call to get<0>(anon) being made
> > certainly has difference, because it can have
> > observable effect.
>
> It does not, so it cannot have an observable effect.

doesnt it? If a function returns a Shared_ptr of a string and string_view
that references the string, if you do:

    auto __ =3D getstr()
    auto [__, view] =3D getstr()

The behavior is observably different between the two cases depending on
whether the compiler elides the get(0).  If you elide the get(0) in the
second example isn't view going to point potentially freed memory?  It
seems like there needs to be a distinction for structured binding between
"don't care about name but keep alive for RAII" vs "don't care about value
at all".  There may be cases in the former where a compiler finds room for
optimization so it'll be equivalent in many cases.  It also has the added
benefit of ensuring that the performance and lifetime behavior is identical
to when you provide an identifier which is great for consistency and
teachability.

Personally I think the "ignore" semantic is not as interesting - if
performance is a concern then you'll have to be slightly more explicit or
if it's common enough a separate mechanism can be developed.


> --
> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
>    Software Architect - Intel Open Source Technology Center
>
> --
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>

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<div><br><div class=3D"gmail_quote"><div>On Tue, Mar 28, 2017 at 10:52 AM T=
hiago Macieira &lt;<a href=3D"mailto:thiago@macieira.org">thiago@macieira.o=
rg</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On ter=C3=A7a-fei=
ra, 28 de mar=C3=A7o de 2017 09:53:51 PDT Zhihao Yuan wrote:<br class=3D"gm=
ail_msg">
&gt; Whether a call to get&lt;0&gt;(anon) being made<br class=3D"gmail_msg"=
>
&gt; certainly has difference, because it can have<br class=3D"gmail_msg">
&gt; observable effect.<br class=3D"gmail_msg">
<br class=3D"gmail_msg">
It does not, so it cannot have an observable effect.</blockquote><div>doesn=
t it? If a function returns a Shared_ptr of a string and string_view that r=
eferences the string, if you do:</div><div><br></div><div>=C2=A0 =C2=A0 aut=
o __ =3D getstr()</div><div>=C2=A0 =C2=A0 auto [__, view] =3D getstr()</div=
><div><br></div><div>The behavior is observably different between the two c=
ases depending on whether the compiler elides the get(0).=C2=A0 If you elid=
e the get(0) in the second example isn&#39;t view going to point potentiall=
y freed memory?=C2=A0 It seems like there needs to be a distinction for str=
uctured binding between &quot;don&#39;t care about name but keep alive for =
RAII&quot; vs &quot;don&#39;t care about value at all&quot;.=C2=A0 There ma=
y be cases in the former where a compiler finds room for optimization so it=
&#39;ll be equivalent in many cases.=C2=A0 It also has the added benefit of=
 ensuring that the performance and lifetime behavior is identical to when y=
ou provide an identifier which is great for consistency and teachability.</=
div><div><br></div><div>Personally I think the &quot;ignore&quot; semantic =
is not as interesting - if performance is a concern then you&#39;ll have to=
 be slightly more explicit or if it&#39;s common enough a separate mechanis=
m can be developed.</div><div><br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br =
class=3D"gmail_msg">
--<br class=3D"gmail_msg">
Thiago Macieira - thiago (AT) <a href=3D"http://macieira.info" rel=3D"noref=
errer" class=3D"gmail_msg" target=3D"_blank">macieira.info</a> - thiago (AT=
) <a href=3D"http://kde.org" rel=3D"noreferrer" class=3D"gmail_msg" target=
=3D"_blank">kde.org</a><br class=3D"gmail_msg">
=C2=A0 =C2=A0Software Architect - Intel Open Source Technology Center<br cl=
ass=3D"gmail_msg">
<br class=3D"gmail_msg">
--<br class=3D"gmail_msg">
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</blockquote></div></div>

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--001a113dd48afdec35054bea7817--

.

On quarta-feira, 29 de mar=C3=A7o de 2017 20:41:37 PDT Vitali Lovich wrote:
> > It does not, so it cannot have an observable effect.
>=20
> doesnt it? If a function returns a Shared_ptr of a string and string_view
> that references the string, if you do:

Can you be more specific what this function returns? "A shared_ptr of a str=
ing=20
and a string_view" does not make sense, since shared_ptr only takes one=20
template parameter.

I'll analyse the rest when you post your reply.

--=20
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

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Wouldn't it be much better to have a concept of *Context*? I am taking=20
inspiration from python (I know they use it for RAII, but that is a=20
different discussion).

The code might look like:

  void foo() {
    // do stuff
    with (unique_lock{mutex}) {
      // critical code
    }
    // other stuff
  }

Then, for prettiness and to avoid unnecessary indentations, when the=20
*Context* extends till the end of the parent scope, it can just be a=20
declaration:

  void foo() {
    with unique_lock{mutex};
    // critical code
  }

You can also nest *Contexts*:

  void foo() {
    with unique_lock{mutex1};
    with unique_lock{mutex2};
    // etc
  }

Also, by having a proper concept of *Context*, compilers and static=20
analysis tools would have more information available.

I don't know about the decomposition side of things, but perhaps using, say=
=20
@  instead? But I have to admit I still haven't understood the difference=
=20
with std::ignore (perhaps I have homework to do):

    auto [x, @, z] =3D expr;

Is anything of this any useful at all?

On Monday, 27 March 2017 21:27:11 UTC+1, Alberto Barbati wrote:

> Hello,
>
> this is a draft for a proposal to add a special meaning to the identifier=
=20
> __ (double underscore) so that it can be used (even repeatedly in the sam=
e=20
> lexical scope) for all variables whose name is not important and that is =
no=20
> longer needed after declaration. The draft includes a few examples.
>
> Is there any interest in this?
>
> Thanks in advance,
>
> Alberto
>
>
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<div dir=3D"ltr"><div>Wouldn&#39;t it be much better to have a concept of <=
b>Context</b>? I am taking inspiration from python (I know they use it for =
RAII, but that is a different discussion).</div><div><br></div><div>The cod=
e might look like:</div><div><br></div><div><font face=3D"courier new, mono=
space">=C2=A0 void foo() {</font></div><div><font face=3D"courier new, mono=
space">=C2=A0 =C2=A0 // do stuff</font></div><div><font face=3D"courier new=
, monospace">=C2=A0 =C2=A0 with (unique_lock{mutex}) {</font></div><div><fo=
nt face=3D"courier new, monospace">=C2=A0 =C2=A0 =C2=A0 // critical code</f=
ont></div><div><font face=3D"courier new, monospace">=C2=A0 =C2=A0 }</font>=
</div><div><font face=3D"courier new, monospace">=C2=A0 =C2=A0 // other stu=
ff</font></div><div><font face=3D"courier new, monospace">=C2=A0 }</font></=
div><div><br></div><div>Then, for prettiness and to avoid unnecessary inden=
tations, when the <b>Context</b> extends till the end of the parent scope, =
it can just be a declaration:</div><div><br></div><div><font face=3D"courie=
r new, monospace">=C2=A0 void foo() {</font></div><div><font face=3D"courie=
r new, monospace">=C2=A0 =C2=A0 with unique_lock{mutex};</font></div><div><=
font face=3D"courier new, monospace">=C2=A0 =C2=A0 // critical code<br></fo=
nt></div><div><font face=3D"courier new, monospace">=C2=A0 }</font></div><d=
iv><div><br></div><div>You can also nest <b>Contexts</b>:</div><div><br></d=
iv><div><font face=3D"courier new, monospace">=C2=A0 void foo() {</font></d=
iv><div><font face=3D"courier new, monospace">=C2=A0 =C2=A0 with unique_loc=
k{mutex1};</font></div><div><div><font face=3D"courier new, monospace">=C2=
=A0 =C2=A0 with unique_lock{mutex2};</font></div><div><font face=3D"courier=
 new, monospace">=C2=A0 =C2=A0 // etc</font></div><div><font face=3D"courie=
r new, monospace">=C2=A0 }</font></div><div><br></div><div>Also, by having =
a proper concept of <b>Context</b>, compilers and static analysis tools wou=
ld have more information available.</div><div><br></div><div>I don&#39;t kn=
ow about the decomposition side of things, but perhaps using, say <font fac=
e=3D"courier new, monospace">@</font> =C2=A0instead? But I have to admit I =
still haven&#39;t understood the difference with <font face=3D"courier new,=
 monospace">std::ignore</font> (perhaps I have homework to do):</div><div><=
br></div><div><font face=3D"courier new, monospace">=C2=A0 =C2=A0 auto [x, =
@, z] =3D expr;<br></font></div><div><br></div><div>Is anything of this any=
 useful at all?</div><div><br></div><div>On Monday, 27 March 2017 21:27:11 =
UTC+1, Alberto Barbati  wrote:<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-le=
ft: 1ex;"><div dir=3D"ltr">Hello,<br><br>this is a draft for a proposal to =
add a special meaning to the identifier __ (double underscore) so that it c=
an be used (even repeatedly in the same lexical scope) for all variables wh=
ose name is not important and that is no longer needed after declaration. T=
he draft includes a few examples.<br><br>Is there any interest in this?<br>=
<br>Thanks in advance,<br><br>Alberto<br><br></div></blockquote></div></div=
></div>
<br>
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Wouldn't it be much better to have a concept of Context? I am taking
inspiration from python (I know they use it for RAII, but that is a
different discussion).

The code might look like:

  void foo() {
    // do stuff
    with (unique_lock{mutex}) {
      // critical code
    }
    // other stuff
  }

Then, for prettiness and to avoid unnecessary indentations, when the
Context extends till the end of the parent scope, it can just be a
declaration:

  void foo() {
    with unique_lock{mutex};
    // critical code
  }

You can also nest Contexts:

  void foo() {
    with unique_lock{mutex1};
    with unique_lock{mutex2};
    // etc
  }

Also, by having a proper concept of Context, compilers and static analysis
tools would have more information available.

I don't know about the decomposition side of things, but perhaps using, say
@  instead? But I have to admit I still haven't understood the difference
with std::ignore (perhaps I have homework to do):

    auto [x, @, z] = expr;

Is anything of this any useful at all?

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<div dir=3D"ltr"><div>Wouldn&#39;t it be much better to have a concept of C=
ontext? I am taking inspiration from python (I know they use it for RAII, b=
ut that is a different discussion).<br></div><div><br></div><div>The code m=
ight look like:</div><div><font face=3D"courier new, monospace"><br></font>=
</div><div><font face=3D"courier new, monospace">=C2=A0 void foo() {</font>=
</div><div><font face=3D"courier new, monospace">=C2=A0 =C2=A0 // do stuff<=
/font></div><div><font face=3D"courier new, monospace">=C2=A0 =C2=A0 with (=
unique_lock{mutex}) {</font></div><div><font face=3D"courier new, monospace=
">=C2=A0 =C2=A0 =C2=A0 // critical code</font></div><div><font face=3D"cour=
ier new, monospace">=C2=A0 =C2=A0 }</font></div><div><font face=3D"courier =
new, monospace">=C2=A0 =C2=A0 // other stuff</font></div><div><font face=3D=
"courier new, monospace">=C2=A0 }</font></div><div><br></div><div>Then, for=
 prettiness and to avoid unnecessary indentations, when the Context extends=
 till the end of the parent scope, it can just be a declaration:</div><div>=
<br></div><div><font face=3D"courier new, monospace">=C2=A0 void foo() {</f=
ont></div><div><font face=3D"courier new, monospace">=C2=A0 =C2=A0 with uni=
que_lock{mutex};</font></div><div><font face=3D"courier new, monospace">=C2=
=A0 =C2=A0 // critical code</font></div><div><font face=3D"courier new, mon=
ospace">=C2=A0 }</font></div><div><br></div><div>You can also nest Contexts=
:</div><div><br></div><div><font face=3D"courier new, monospace">=C2=A0 voi=
d foo() {</font></div><div><font face=3D"courier new, monospace">=C2=A0 =C2=
=A0 with unique_lock{mutex1};</font></div><div><font face=3D"courier new, m=
onospace">=C2=A0 =C2=A0 with unique_lock{mutex2};</font></div><div><font fa=
ce=3D"courier new, monospace">=C2=A0 =C2=A0 // etc</font></div><div><font f=
ace=3D"courier new, monospace">=C2=A0 }</font></div><div><br></div><div>Als=
o, by having a proper concept of Context, compilers and static analysis too=
ls would have more information available.</div><div><br></div><div>I don&#3=
9;t know about the decomposition side of things, but perhaps using, say @ =
=C2=A0instead? But I have to admit I still haven&#39;t understood the diffe=
rence with <font face=3D"courier new, monospace">std::ignore</font> (perhap=
s I have homework to do):</div><div><br></div><div><font face=3D"courier ne=
w, monospace">=C2=A0 =C2=A0 auto [x, @, z] =3D expr;</font></div><div><br><=
/div><div>Is anything of this any useful at all?</div><div><br></div></div>

<p></p>

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On 2017-03-30 04:12, Raffaele Rossi wrote:
> Wouldn't it be much better to have a concept of Context? I am taking
> inspiration from python (I know they use it for RAII, but that is a
> different discussion).
>
> The code might look like:
>
>   void foo() {
>     // do stuff
>     with (unique_lock{mutex}) {
>       // critical code
>     }
>     // other stuff
>   }

Or, without needing to introduce a new keyword:

  void foo() {
    // do stuff
    using (unique_lock{mutex}) {
      // critical code
    }
    // other stuff
  }

We could support both:

  using (expression) { ... }
  using (declaration = expression) { ... }

....though of course the latter is equivalent to:

  if (declaration = expression; true)

....or, y'know, just using some bare {}'s, which is probably why no one
has been enthusiastic about such a proposal. That may also be why this
direction has not been pursued more enthusiastically; anonymous
variables and/or lifetime extension just seem like a better solution...

(I'm confident this has come up before...)

--
Matthew

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On Thursday, March 30, 2017 at 4:12:46 AM UTC-4, Raffaele Rossi wrote:
>
> Wouldn't it be much better to have a concept of Context?
>

Why would I want to introduce a whole new scope when simply declaring an
unnamed variable is sufficient? It's adding pointless braces for something
that C++ gives by default.

Other languages use this syntax because they *don't* provide RAII by
default. C++ does, so there's no need for explicit syntax to say what we
normally have.

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<div dir=3D"ltr">On Thursday, March 30, 2017 at 4:12:46 AM UTC-4, Raffaele =
Rossi wrote:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-lef=
t: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir=3D"ltr"><=
div>Wouldn&#39;t it be much better to have a concept of Context?</div></div=
></blockquote><div><br>Why would I want to introduce a whole new scope when=
 simply declaring an unnamed variable is sufficient? It&#39;s adding pointl=
ess braces for something that C++ gives by default.<br><br>Other languages =
use this syntax because they <i>don&#39;t</i> provide RAII by default. C++ =
does, so there&#39;s no need for explicit syntax to say what we normally ha=
ve.<br></div></div>

<p></p>

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You only add a scope if you need it, i.e to lock only a section of a=20
function, in which case you have to create a scope anyway:

void foo() {
    // do stuff
    {
        unique_lock __{mutex};
    }
}

And between the two, doing using(...) { } is also more explicit on the=20
intention, instead of just opening a "anonymous" scope, isn't it?

Il giorno gioved=C3=AC 30 marzo 2017 15:36:10 UTC+1, Nicol Bolas ha scritto=
:
>
> On Thursday, March 30, 2017 at 4:12:46 AM UTC-4, Raffaele Rossi wrote:
>>
>> Wouldn't it be much better to have a concept of Context?
>>
>
> Why would I want to introduce a whole new scope when simply declaring an=
=20
> unnamed variable is sufficient? It's adding pointless braces for somethin=
g=20
> that C++ gives by default.
>
> Other languages use this syntax because they *don't* provide RAII by=20
> default. C++ does, so there's no need for explicit syntax to say what we=
=20
> normally have.
>

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<div dir=3D"ltr"><div>You only add a scope if you need it, i.e to lock only=
 a section of a function, in which case you have to create a scope anyway:<=
br></div><div><br></div><div><font face=3D"courier new, monospace">void foo=
() {</font></div><div><font face=3D"courier new, monospace">=C2=A0 =C2=A0 /=
/ do stuff</font></div><div><font face=3D"courier new, monospace">=C2=A0 =
=C2=A0 {</font></div><div><font face=3D"courier new, monospace">=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 unique_lock __{mutex};</font></div><div><font face=3D"cou=
rier new, monospace">=C2=A0 =C2=A0 }<br>}</font></div><div><br>And between =
the two, doing <font face=3D"courier new, monospace">using(...) { }</font> =
is also more explicit on the intention, instead of just opening a &quot;ano=
nymous&quot; scope, isn&#39;t it?<br><br>Il giorno gioved=C3=AC 30 marzo 20=
17 15:36:10 UTC+1, Nicol Bolas ha scritto:<blockquote class=3D"gmail_quote"=
 style=3D"margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-=
left: 1ex;"><div dir=3D"ltr">On Thursday, March 30, 2017 at 4:12:46 AM UTC-=
4, Raffaele Rossi wrote:<blockquote class=3D"gmail_quote" style=3D"margin:0=
;margin-left:0.8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D=
"ltr"><div>Wouldn&#39;t it be much better to have a concept of Context?</di=
v></div></blockquote><div><br>Why would I want to introduce a whole new sco=
pe when simply declaring an unnamed variable is sufficient? It&#39;s adding=
 pointless braces for something that C++ gives by default.<br><br>Other lan=
guages use this syntax because they <i>don&#39;t</i> provide RAII by defaul=
t. C++ does, so there&#39;s no need for explicit syntax to say what we norm=
ally have.<br></div></div></blockquote></div></div>

<p></p>

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.

> Il giorno 30 mar 2017, alle ore 05:41, Vitali Lovich <vlovich@gmail.com> =
ha scritto:
>=20
> If a function returns a Shared_ptr of a string and string_view that refer=
ences the string, if you do:
>=20
>     auto __ =3D getstr()
>     auto [__, view] =3D getstr()
>=20
> The behavior is observably different between the two cases depending on w=
hether the compiler elides the get(0).  If you elide the get(0) in the seco=
nd example isn't view going to point potentially freed memory?=20

Why would view point to potentially freed memory? Decomposition declaration=
 works like this:

1) initialize a hidden "main" object using the initializer
2) bind "element" names to subobjects of the main objects

The elements are guaranteed not to outlive the main object. Point 2) can be=
 obtained differently according to the type of the main object. In the most=
 general case, get<>() may be invoked. The Standard does not mandate that g=
et<>() function shall have no side effects, but, really, the intent should =
be to get hold of a reference of a subobject of the main object, no signifi=
cant task should be performed.

> It seems like there needs to be a distinction for structured binding betw=
een "don't care about name but keep alive for RAII" vs "don't care about va=
lue at all".

In the case of a decomposition declaration, all RAII logic should performed=
 by the main object itself, since it's guaranteed to be destroyed after the=
 elements. Having an element perform RAII logic is a misuse of the feature.=
 Remember that you are not required to always decompose the object with thi=
s syntax.

> Personally I think the "ignore" semantic is not as interesting - if perfo=
rmance is a concern then you'll have to be slightly more explicit or if it'=
s common enough a separate mechanism can be developed.

I believe it is interesting. However, I understand what you mean. For regul=
ar declarations we definitely want the "keep" semantic, I guess we agree on=
 that. For decomposition declarations we might get either a "keep" or "igno=
re" semantic. In most cases (e.g.: aggregates, arrays and objects whose get=
() functions have no side effect) the result is the same. In the remaining =
corner case, I expect the "ignore" semantic to be more useful, but this is =
a personal opinion. It's a fact, however that if we mandate the "ignore" se=
mantic, the programmer might easily get the "keep" by just providing any id=
entifier different from __. However if we mandate the "keep" semantic, ther=
e's no way to get the other one.

A.

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tuple<shared_ptr<string>, string_view> getstr()

The 2nd argument is a view into the string owned by shared_ptr.

The semantics of whether or not the string view points to owned memory
depends on the lifetime of the shared_ptr and my understanding of what you
were saying is that the lifetime changes depending on whether the get() is
done or ignored.

On Wed, Mar 29, 2017 at 9:12 PM Thiago Macieira <thiago@macieira.org> wrote=
:

> On quarta-feira, 29 de mar=C3=A7o de 2017 20:41:37 PDT Vitali Lovich wrot=
e:
> > > It does not, so it cannot have an observable effect.
> >
> > doesnt it? If a function returns a Shared_ptr of a string and string_vi=
ew
> > that references the string, if you do:
>
> Can you be more specific what this function returns? "A shared_ptr of a
> string
> and a string_view" does not make sense, since shared_ptr only takes one
> template parameter.
>
> I'll analyse the rest when you post your reply.
>
> --
> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
>    Software Architect - Intel Open Source Technology Center
>
> --
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> https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/3760122.IY8c=
Fr858X%40tjmaciei-mobl1
> .
>

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<div>tuple&lt;shared_ptr&lt;string&gt;, string_view&gt; getstr()</div><div>=
<br></div><div>The 2nd argument is a view into the string owned by shared_p=
tr.</div><div><br></div><div>The semantics of whether or not the string vie=
w points to owned memory depends on the lifetime of the shared_ptr and my u=
nderstanding of what you were saying is that the lifetime changes depending=
 on whether the get() is done or ignored.</div><div><br><div class=3D"gmail=
_quote"><div>On Wed, Mar 29, 2017 at 9:12 PM Thiago Macieira &lt;<a href=3D=
"mailto:thiago@macieira.org">thiago@macieira.org</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px =
#ccc solid;padding-left:1ex">On quarta-feira, 29 de mar=C3=A7o de 2017 20:4=
1:37 PDT Vitali Lovich wrote:<br class=3D"gmail_msg">
&gt; &gt; It does not, so it cannot have an observable effect.<br class=3D"=
gmail_msg">
&gt;<br class=3D"gmail_msg">
&gt; doesnt it? If a function returns a Shared_ptr of a string and string_v=
iew<br class=3D"gmail_msg">
&gt; that references the string, if you do:<br class=3D"gmail_msg">
<br class=3D"gmail_msg">
Can you be more specific what this function returns? &quot;A shared_ptr of =
a string<br class=3D"gmail_msg">
and a string_view&quot; does not make sense, since shared_ptr only takes on=
e<br class=3D"gmail_msg">
template parameter.<br class=3D"gmail_msg">
<br class=3D"gmail_msg">
I&#39;ll analyse the rest when you post your reply.<br class=3D"gmail_msg">
<br class=3D"gmail_msg">
--<br class=3D"gmail_msg">
Thiago Macieira - thiago (AT) <a href=3D"http://macieira.info" rel=3D"noref=
errer" class=3D"gmail_msg" target=3D"_blank">macieira.info</a> - thiago (AT=
) <a href=3D"http://kde.org" rel=3D"noreferrer" class=3D"gmail_msg" target=
=3D"_blank">kde.org</a><br class=3D"gmail_msg">
=C2=A0 =C2=A0Software Architect - Intel Open Source Technology Center<br cl=
ass=3D"gmail_msg">
<br class=3D"gmail_msg">
--<br class=3D"gmail_msg">
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Ah. But I forgot now that with structured binding there's a hidden local
variable anyway for the tuple itself.  I was thinking the compiler was
smart and applied RVO to the individual elements directly.

On Thu, Mar 30, 2017 at 2:40 PM Vitali Lovich <vlovich@gmail.com> wrote:

> tuple<shared_ptr<string>, string_view> getstr()
>
> The 2nd argument is a view into the string owned by shared_ptr.
>
> The semantics of whether or not the string view points to owned memory
> depends on the lifetime of the shared_ptr and my understanding of what yo=
u
> were saying is that the lifetime changes depending on whether the get() i=
s
> done or ignored.
>
> On Wed, Mar 29, 2017 at 9:12 PM Thiago Macieira <thiago@macieira.org>
> wrote:
>
> On quarta-feira, 29 de mar=C3=A7o de 2017 20:41:37 PDT Vitali Lovich wrot=
e:
> > > It does not, so it cannot have an observable effect.
> >
> > doesnt it? If a function returns a Shared_ptr of a string and string_vi=
ew
> > that references the string, if you do:
>
> Can you be more specific what this function returns? "A shared_ptr of a
> string
> and a string_view" does not make sense, since shared_ptr only takes one
> template parameter.
>
> I'll analyse the rest when you post your reply.
>
> --
> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
>    Software Architect - Intel Open Source Technology Center
>
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>
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<div>Ah. But I forgot now that with structured binding there&#39;s a hidden=
 local variable anyway for the tuple itself.=C2=A0 I was thinking the compi=
ler was smart and applied RVO to the individual elements directly.</div><di=
v><br><div class=3D"gmail_quote"><div>On Thu, Mar 30, 2017 at 2:40 PM Vital=
i Lovich &lt;<a href=3D"mailto:vlovich@gmail.com">vlovich@gmail.com</a>&gt;=
 wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex"><div class=3D"gmail_msg">tu=
ple&lt;shared_ptr&lt;string&gt;, string_view&gt; getstr()</div><div class=
=3D"gmail_msg"><br class=3D"gmail_msg"></div><div class=3D"gmail_msg">The 2=
nd argument is a view into the string owned by shared_ptr.</div><div class=
=3D"gmail_msg"><br class=3D"gmail_msg"></div><div class=3D"gmail_msg">The s=
emantics of whether or not the string view points to owned memory depends o=
n the lifetime of the shared_ptr and my understanding of what you were sayi=
ng is that the lifetime changes depending on whether the get() is done or i=
gnored.</div><div class=3D"gmail_msg"><br class=3D"gmail_msg"><div class=3D=
"gmail_quote gmail_msg"><div class=3D"gmail_msg">On Wed, Mar 29, 2017 at 9:=
12 PM Thiago Macieira &lt;<a href=3D"mailto:thiago@macieira.org" class=3D"g=
mail_msg" target=3D"_blank">thiago@macieira.org</a>&gt; wrote:<br class=3D"=
gmail_msg"></div><blockquote class=3D"gmail_quote gmail_msg" style=3D"margi=
n:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On quarta-feira, =
29 de mar=C3=A7o de 2017 20:41:37 PDT Vitali Lovich wrote:<br class=3D"gmai=
l_msg">
&gt; &gt; It does not, so it cannot have an observable effect.<br class=3D"=
gmail_msg">
&gt;<br class=3D"gmail_msg">
&gt; doesnt it? If a function returns a Shared_ptr of a string and string_v=
iew<br class=3D"gmail_msg">
&gt; that references the string, if you do:<br class=3D"gmail_msg">
<br class=3D"gmail_msg">
Can you be more specific what this function returns? &quot;A shared_ptr of =
a string<br class=3D"gmail_msg">
and a string_view&quot; does not make sense, since shared_ptr only takes on=
e<br class=3D"gmail_msg">
template parameter.<br class=3D"gmail_msg">
<br class=3D"gmail_msg">
I&#39;ll analyse the rest when you post your reply.<br class=3D"gmail_msg">
<br class=3D"gmail_msg">
--<br class=3D"gmail_msg">
Thiago Macieira - thiago (AT) <a href=3D"http://macieira.info" rel=3D"noref=
errer" class=3D"gmail_msg" target=3D"_blank">macieira.info</a> - thiago (AT=
) <a href=3D"http://kde.org" rel=3D"noreferrer" class=3D"gmail_msg" target=
=3D"_blank">kde.org</a><br class=3D"gmail_msg">
=C2=A0 =C2=A0Software Architect - Intel Open Source Technology Center<br cl=
ass=3D"gmail_msg">
<br class=3D"gmail_msg">
--<br class=3D"gmail_msg">
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> Il giorno 30 mar 2017, alle ore 23:41, Vitali Lovich <vlovich@gmail.com> =
ha scritto:
>=20
> Ah. But I forgot now that with structured binding there's a hidden local =
variable anyway for the tuple itself.  I was thinking the compiler was smar=
t and applied RVO to the individual elements directly.

Exactly. All RAII logic is (or at least should be) performed by the "main" =
hidden object that is being decomposed. No get() function should ever depen=
d on the side effects of other get() function on the same object, because o=
therwise the following valid code would become problematic:

auto x =3D getstr();
auto v =3D get<1>(x);

A.=20

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=
=3Dutf-8"></head><body dir=3D"auto"><div><span></span></div><div><meta http=
-equiv=3D"content-type" content=3D"text/html; charset=3Dutf-8"><div><br></d=
iv><div>Il giorno 30 mar 2017, alle ore 23:41, Vitali Lovich &lt;<a href=3D=
"mailto:vlovich@gmail.com">vlovich@gmail.com</a>&gt; ha scritto:<br><br></d=
iv><blockquote type=3D"cite"><div><div>Ah. But I forgot now that with struc=
tured binding there's a hidden local variable anyway for the tuple itself.&=
nbsp; I was thinking the compiler was smart and applied RVO to the individu=
al elements directly.</div></div></blockquote><div><br></div>Exactly. All R=
AII logic is (or at least should be) performed by the "main" hidden object =
that is being decomposed. No get() function should ever depend on the side =
effects of other get() function on the same object, because otherwise the f=
ollowing valid code would become problematic:<div><br></div><div>auto x =3D=
&nbsp;<span style=3D"background-color: rgba(255, 255, 255, 0);">getstr();</=
span></div><div>auto v =3D get&lt;1&gt;(x);</div><div><br></div><div>A.&nbs=
p;</div></div></body></html>

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I don't think you need a reserved identifier for this, nor to change the
meaning of any existing code (whether or not it uses a reserved
identifier). It seems to me that your use cases could be addressed by
allowing the identifier _ to declare multiple entities within a block
scope. (If it is multiply declared, any reference to it would be ill-formed
due to ambiguity; if it's only declared once, it can still be referenced
for backwards compatibility, but such usage could be deprecated.)

Have you considered that possibility? It would give a better name (_ rather
than __) and avoid "breaking" existing code that uses __.

On 27 Mar 2017 10:27 am, "Alberto Barbati" <albertobarbati@gmail.com> wrote:

Hello,

this is a draft for a proposal to add a special meaning to the identifier
__ (double underscore) so that it can be used (even repeatedly in the same
lexical scope) for all variables whose name is not important and that is no
longer needed after declaration. The draft includes a few examples.

Is there any interest in this?

Thanks in advance,

Alberto

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<div dir=3D"auto"><div>I don&#39;t think you need a reserved identifier for=
 this, nor to change the meaning of any existing code (whether or not it us=
es a reserved identifier). It seems to me that your use cases could be addr=
essed by allowing the identifier _ to declare multiple entities within a bl=
ock scope. (If it is multiply declared, any reference to it would be ill-fo=
rmed due to ambiguity; if it&#39;s only declared once, it can still be refe=
renced for backwards compatibility, but such usage could be deprecated.)<br=
><div class=3D"gmail_extra" dir=3D"auto"><br></div><div class=3D"gmail_extr=
a" dir=3D"auto">Have you considered that possibility? It would give a bette=
r name (_ rather than __) and avoid &quot;breaking&quot; existing code that=
 uses __.</div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On=
 27 Mar 2017 10:27 am, &quot;Alberto Barbati&quot; &lt;<a href=3D"mailto:al=
bertobarbati@gmail.com">albertobarbati@gmail.com</a>&gt; wrote:<br type=3D"=
attribution"><blockquote class=3D"quote" style=3D"margin:0 0 0 .8ex;border-=
left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Hello,<br><br>this i=
s a draft for a proposal to add a special meaning to the identifier __ (dou=
ble underscore) so that it can be used (even repeatedly in the same lexical=
 scope) for all variables whose name is not important and that is no longer=
 needed after declaration. The draft includes a few examples.<br><br>Is the=
re any interest in this?<br><br>Thanks in advance,<br><br>Alberto<font colo=
r=3D"#888888"><br><br></font></div><font color=3D"#888888">

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On Sat, Apr 01, 2017 at 09:19:37PM -0700, Richard Smith wrote:
> I don't think you need a reserved identifier for this, nor to change the
> meaning of any existing code (whether or not it uses a reserved
> identifier). It seems to me that your use cases could be addressed by
> allowing the identifier _ to declare multiple entities within a block
> scope. (If it is multiply declared, any reference to it would be ill-formed
> due to ambiguity; if it's only declared once, it can still be referenced
> for backwards compatibility, but such usage could be deprecated.)
>
> Have you considered that possibility? It would give a better name (_ rather
> than __) and avoid "breaking" existing code that uses __.

If there are concerns about the use of __ due to it beeing used in real code
then that is way worse for _.

One common use of _ is as a macro name in gettextized GNU programs. Now, this
use doesn't clash with the proposed use case but I doubt they are the only
ones that have used the name.

Additionally the name _ is reserved for the library so it is not even ours
in the first place.

/MF

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On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard Smith wrote:
> Have you considered that possibility? It would give a better name (_ rath=
er
> than __) and avoid "breaking" existing code that uses __.

_ is not reserved to the compiler and is VERY often #defined to gettext.

Let's use __. At least we can point to V8 developers and tell them it's the=
ir=20
own fault.

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   Software Architect - Intel Open Source Technology Center

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On 2 April 2017 at 11:03, Thiago Macieira <thiago@macieira.org> wrote:

> On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard Smith wrote:
> > Have you considered that possibility? It would give a better name (_
> rather
> > than __) and avoid "breaking" existing code that uses __.
>
> _ is not reserved to the compiler and is VERY often #defined to gettext.
>

Only as a function-like macro.

Let's use __.


Let's use the thing that works best for C++, sure. I am not (yet) convinced
that's __.


> At least we can point to V8 developers and tell them it's their
> own fault.
>
> --
> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
>    Software Architect - Intel Open Source Technology Center
>
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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On 2=
 April 2017 at 11:03, Thiago Macieira <span dir=3D"ltr">&lt;<a href=3D"mail=
to:thiago@macieira.org" target=3D"_blank">thiago@macieira.org</a>&gt;</span=
> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex"><span class=3D"">On s=C3=A1bado,=
 1 de abril de 2017 21:19:37 PDT Richard Smith wrote:<br>
&gt; Have you considered that possibility? It would give a better name (_ r=
ather<br>
&gt; than __) and avoid &quot;breaking&quot; existing code that uses __.<br=
>
<br>
</span>_ is not reserved to the compiler and is VERY often #defined to gett=
ext.<br></blockquote><div><br></div><div>Only as a function-like macro.</di=
v><div><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex">
Let&#39;s use __.</blockquote><div><br></div><div>Let&#39;s use the thing t=
hat works best for C++, sure. I am not (yet) convinced that&#39;s __.</div>=
<div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex">At least we can point to V8=
 developers and tell them it&#39;s their<br>
own fault.<br>
<span class=3D""><br>
--<br>
Thiago Macieira - thiago (AT) <a href=3D"http://macieira.info" rel=3D"noref=
errer" target=3D"_blank">macieira.info</a> - thiago (AT) <a href=3D"http://=
kde.org" rel=3D"noreferrer" target=3D"_blank">kde.org</a><br>
=C2=A0 =C2=A0Software Architect - Intel Open Source Technology Center<br>
<br>
</span><span class=3D"">--<br>
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<wbr>isocpp.org/d/msgid/std-<wbr>proposals/1491170458.<wbr>9U0G8TLsOk%40tjm=
aciei-mobl1</a>.<br>
</blockquote></div><br></div></div>

<p></p>

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On Sunday, April 2, 2017 at 3:28:54 PM UTC-4, Richard Smith wrote:
>
> On 2 April 2017 at 11:03, Thiago Macieira <thi...@macieira.org=20
> <javascript:>> wrote:
>
>> On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard Smith wrote:
>> > Have you considered that possibility? It would give a better name (_=
=20
>> rather
>> > than __) and avoid "breaking" existing code that uses __.
>>
>> _ is not reserved to the compiler and is VERY often #defined to gettext.
>>
>
> Only as a function-like macro.
>
> Let's use __.
>
>
> Let's use the thing that works best for C++, sure. I am not (yet)=20
> convinced that's __.
>

Well, let's look at the options.

You can't use nothing; that would create parsing ambiguities. So you have=
=20
to put something there: either an identifier or something that is not an=20
identifier.

If it is not an identifier, then it must be a keyword (new or old) or some=
=20
form of punctuation. Adding a new keyword for something like this is rather=
=20
silly. And I don't know of an old keyword that would make for a good=20
placeholder.

You could use `[]` as I once suggested, piggybacking off of structured=20
binding rules. But most other punctuation would be confusing or otherwise=
=20
unexpected in a variable declaration.

If it is an identifier, then it must be a *reserved* identifier, to=20
minimize code breakage when we change its meaning. The shortest reserved=20
identifier is `_`, which is currently reserved for use by the=20
implementation, but only for names in the global namespace. Which means=20
that right now, this is 100% legal:

namespace foo
{
  constexpr int _ =3D 20;
}

So changing the meaning of that code is a non-starter.

The second shortest reserved identifiers are of the form `_*`, where `*` is=
=20
an uppercase letter or `_`. These are reserved by the implementation for *a=
ny=20
use*. And implementations are more easily changed than user code.

So from my perspective, `__` is the most viable identifier.

--=20
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ISO C++ Standard - Future Proposals" group.
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..org/d/msgid/std-proposals/10c2c556-b6bb-4714-83bc-7b0ac8fd4143%40isocpp.or=
g.

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<div dir=3D"ltr">On Sunday, April 2, 2017 at 3:28:54 PM UTC-4, Richard Smit=
h wrote:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-left: 0=
..8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir=3D"ltr"><div>=
<div class=3D"gmail_quote">On 2 April 2017 at 11:03, Thiago Macieira <span =
dir=3D"ltr">&lt;<a href=3D"javascript:" target=3D"_blank" gdf-obfuscated-ma=
ilto=3D"WGTld1FVCQAJ" rel=3D"nofollow" onmousedown=3D"this.href=3D&#39;java=
script:&#39;;return true;" onclick=3D"this.href=3D&#39;javascript:&#39;;ret=
urn true;">thi...@macieira.org</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex"><span>On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard=
 Smith wrote:<br>
&gt; Have you considered that possibility? It would give a better name (_ r=
ather<br>
&gt; than __) and avoid &quot;breaking&quot; existing code that uses __.<br=
>
<br>
</span>_ is not reserved to the compiler and is VERY often #defined to gett=
ext.<br></blockquote><div><br></div><div>Only as a function-like macro.</di=
v><div><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex">
Let&#39;s use __.</blockquote><div><br></div><div>Let&#39;s use the thing t=
hat works best for C++, sure. I am not (yet) convinced that&#39;s __.</div>=
</div></div></div></blockquote><div><br>Well, let&#39;s look at the options=
..<br><br>You can&#39;t use nothing; that would create parsing ambiguities. =
So you have to put something there: either an identifier or something that =
is not an identifier.<br><br>If it is not an identifier, then it must be a =
keyword (new or old) or some form of punctuation. Adding a new keyword for =
something like this is rather silly. And I don&#39;t know of an old keyword=
 that would make for a good placeholder.<br><br>You could use `[]` as I onc=
e suggested, piggybacking off of structured binding rules. But most other p=
unctuation would be confusing or otherwise unexpected in a variable declara=
tion.<br><br>If it is an identifier, then it must be a <i>reserved</i> iden=
tifier, to minimize code breakage when we change its meaning. The shortest =
reserved identifier is `_`, which is currently reserved for use by the impl=
ementation, but only for names in the global namespace. Which means that ri=
ght now, this is 100% legal:<br><br><div style=3D"background-color: rgb(250=
, 250, 250); border-color: rgb(187, 187, 187); border-style: solid; border-=
width: 1px; overflow-wrap: break-word;" class=3D"prettyprint"><code class=
=3D"prettyprint"><div class=3D"subprettyprint"><span style=3D"color: #008;"=
 class=3D"styled-by-prettify">namespace</span><span style=3D"color: #000;" =
class=3D"styled-by-prettify"> foo<br></span><span style=3D"color: #660;" cl=
ass=3D"styled-by-prettify">{</span><span style=3D"color: #000;" class=3D"st=
yled-by-prettify"><br>=C2=A0 </span><span style=3D"color: #008;" class=3D"s=
tyled-by-prettify">constexpr</span><span style=3D"color: #000;" class=3D"st=
yled-by-prettify"> </span><span style=3D"color: #008;" class=3D"styled-by-p=
rettify">int</span><span style=3D"color: #000;" class=3D"styled-by-prettify=
"> _ </span><span style=3D"color: #660;" class=3D"styled-by-prettify">=3D</=
span><span style=3D"color: #000;" class=3D"styled-by-prettify"> </span><spa=
n style=3D"color: #066;" class=3D"styled-by-prettify">20</span><span style=
=3D"color: #660;" class=3D"styled-by-prettify">;</span><span style=3D"color=
: #000;" class=3D"styled-by-prettify"><br></span><span style=3D"color: #660=
;" class=3D"styled-by-prettify">}</span></div></code></div><br>So changing =
the meaning of that code is a non-starter.<br><br>The second shortest reser=
ved identifiers are of the form `_*`, where `*` is an uppercase letter or `=
_`. These are reserved by the implementation for <i>any use</i>. And implem=
entations are more easily changed than user code.<br><br>So from my perspec=
tive, `__` is the most viable identifier.<br></div></div>

<p></p>

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40isocpp.org?utm_medium=3Demail&utm_source=3Dfooter">https://groups.google.=
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%40isocpp.org</a>.<br />

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.

Il giorno 02 apr 2017, alle ore 20:03, Thiago Macieira <thiago@macieira.org=
> ha scritto:

>> On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard Smith wrote:
>> Have you considered that possibility? It would give a better name (_ rat=
her
>> than __) and avoid "breaking" existing code that uses __.
>=20
> _ is not reserved to the compiler and is VERY often #defined to gettext.

Thank you Richard for your suggestion which is very interesting, since it p=
rovides good insights about a possible wording. As for the name, I believe =
Thiago and Magnus raised valid concerns, though. It's true that the we migh=
t choose _ without breaking existing code. However defining _ as a macro is=
 currently valid and apparently widely used. I believe we therefore have on=
ly two choices: either we make such uses undefined behavior (upsetting a lo=
t of people) or we choose wording to avoid that (making the feature essenti=
ally unusable for users of all libraries like gettext). None of the two app=
roaches seems very good. Is there a third option?

__ seems somewhat safer and less controversial.

Alberto

--=20
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..

.

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On 2 April 2017 at 12:56, Alberto Barbati <albertobarbati@gmail.com> wrote:

> Il giorno 02 apr 2017, alle ore 20:03, Thiago Macieira <
> thiago@macieira.org> ha scritto:
>
> >> On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard Smith wrote:
> >> Have you considered that possibility? It would give a better name (_
> rather
> >> than __) and avoid "breaking" existing code that uses __.
> >
> > _ is not reserved to the compiler and is VERY often #defined to gettext=
..
>
> Thank you Richard for your suggestion which is very interesting, since it
> provides good insights about a possible wording. As for the name, I belie=
ve
> Thiago and Magnus raised valid concerns, though. It's true that the we
> might choose _ without breaking existing code. However defining _ as a
> macro is currently valid and apparently widely used. I believe we therefo=
re
> have only two choices: either we make such uses undefined behavior
> (upsetting a lot of people) or we choose wording to avoid that (making th=
e
> feature essentially unusable for users of all libraries like gettext). No=
ne
> of the two approaches seems very good. Is there a third option?
>

As noted, gettext defines _ as a function-like macro, so there seems to be
no technical problem for users of gettext (although some might consider
overloading the meaning of _ in this way to be a readability problem).

__ seems somewhat safer and less controversial.


I would expect you'll find controversy if you pick a worse name in order to
avoid collision with a macro name that some would already consider to be
poorly chosen, so I don't think it's clear which will be less controversial=
..

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On 2=
 April 2017 at 12:56, Alberto Barbati <span dir=3D"ltr">&lt;<a href=3D"mail=
to:albertobarbati@gmail.com" target=3D"_blank">albertobarbati@gmail.com</a>=
&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0=
 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span>Il giorno 02 apr=
 2017, alle ore 20:03, Thiago Macieira &lt;<a href=3D"mailto:thiago@macieir=
a.org" target=3D"_blank">thiago@macieira.org</a>&gt; ha scritto:<br>
<br>
&gt;&gt; On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard Smith wrot=
e:<br>
&gt;&gt; Have you considered that possibility? It would give a better name =
(_ rather<br>
&gt;&gt; than __) and avoid &quot;breaking&quot; existing code that uses __=
..<br>
&gt;<br>
&gt; _ is not reserved to the compiler and is VERY often #defined to gettex=
t.<br>
<br>
</span>Thank you Richard for your suggestion which is very interesting, sin=
ce it provides good insights about a possible wording. As for the name, I b=
elieve Thiago and Magnus raised valid concerns, though. It&#39;s true that =
the we might choose _ without breaking existing code. However defining _ as=
 a macro is currently valid and apparently widely used. I believe we theref=
ore have only two choices: either we make such uses undefined behavior (ups=
etting a lot of people) or we choose wording to avoid that (making the feat=
ure essentially unusable for users of all libraries like gettext). None of =
the two approaches seems very good. Is there a third option?<br></blockquot=
e><div><br></div><div>As noted, gettext defines _ as a function-like macro,=
 so there seems to be no technical problem for users of gettext (although s=
ome might consider overloading the meaning of _ in this way to be a readabi=
lity problem).</div><div><br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
__ seems somewhat safer and less controversial.</blockquote><div><br></div>=
<div>I would expect you&#39;ll find controversy if you pick a worse name in=
 order to avoid collision with a macro name that some would already conside=
r to be poorly chosen, so I don&#39;t think it&#39;s clear which will be le=
ss controversial.</div></div></div></div>

<p></p>

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h9XneTPCgB4AK7GQ%40mail.gmail.com?utm_medium=3Demail&utm_source=3Dfooter">h=
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On 2 April 2017 at 12:45, Nicol Bolas <jmckesson@gmail.com> wrote:

> On Sunday, April 2, 2017 at 3:28:54 PM UTC-4, Richard Smith wrote:
>>
>> On 2 April 2017 at 11:03, Thiago Macieira <thi...@macieira.org> wrote:
>>
>>> On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard Smith wrote:
>>> > Have you considered that possibility? It would give a better name (_
>>> rather
>>> > than __) and avoid "breaking" existing code that uses __.
>>>
>>> _ is not reserved to the compiler and is VERY often #defined to gettext=
..
>>>
>>
>> Only as a function-like macro.
>>
>> Let's use __.
>>
>>
>> Let's use the thing that works best for C++, sure. I am not (yet)
>> convinced that's __.
>>
>
> Well, let's look at the options.
>
> You can't use nothing; that would create parsing ambiguities. So you have
> to put something there: either an identifier or something that is not an
> identifier.
>
> If it is not an identifier, then it must be a keyword (new or old) or som=
e
> form of punctuation. Adding a new keyword for something like this is rath=
er
> silly. And I don't know of an old keyword that would make for a good
> placeholder.
>
> You could use `[]` as I once suggested, piggybacking off of structured
> binding rules. But most other punctuation would be confusing or otherwise
> unexpected in a variable declaration.
>
> If it is an identifier, then it must be a *reserved* identifier, to
> minimize code breakage when we change its meaning.
>

As I pointed out, this is an incorrect conclusion. There is no necessity
for any code breakage here, and there is no need to pick a reserved
identifier: the core functionality of this proposal does not require that
the identifier be unusable within its scope, and if we don't add that
restriction, this is strictly an extension.

The shortest reserved identifier is `_`, which is currently reserved for
> use by the implementation, but only for names in the global namespace.
> Which means that right now, this is 100% legal:
>
> namespace foo
> {
>   constexpr int _ =3D 20;
> }
>
> So changing the meaning of that code is a non-starter.
>
> The second shortest reserved identifiers are of the form `_*`, where `*`
> is an uppercase letter or `_`. These are reserved by the implementation f=
or *any
> use*. And implementations are more easily changed than user code.
>
> So from my perspective, `__` is the most viable identifier.
>
> --
> You received this message because you are subscribed to the Google Groups
> "ISO C++ Standard - Future Proposals" group.
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> To view this discussion on the web visit https://groups.google.com/a/
> isocpp.org/d/msgid/std-proposals/10c2c556-b6bb-4714-
> 83bc-7b0ac8fd4143%40isocpp.org
> <https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/10c2c556-b6=
bb-4714-83bc-7b0ac8fd4143%40isocpp.org?utm_medium=3Demail&utm_source=3Dfoot=
er>
> .
>

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On 2=
 April 2017 at 12:45, Nicol Bolas <span dir=3D"ltr">&lt;<a href=3D"mailto:j=
mckesson@gmail.com" target=3D"_blank">jmckesson@gmail.com</a>&gt;</span> wr=
ote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border=
-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">On Sunday, April 2,=
 2017 at 3:28:54 PM UTC-4, Richard Smith wrote:<span class=3D""><blockquote=
 class=3D"gmail_quote" style=3D"margin:0;margin-left:0.8ex;border-left:1px =
#ccc solid;padding-left:1ex"><div dir=3D"ltr"><div><div class=3D"gmail_quot=
e">On 2 April 2017 at 11:03, Thiago Macieira <span dir=3D"ltr">&lt;<a rel=
=3D"nofollow">thi...@macieira.org</a>&gt;</span> wrote:<br><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pad=
ding-left:1ex"><span>On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richar=
d Smith wrote:<br>
&gt; Have you considered that possibility? It would give a better name (_ r=
ather<br>
&gt; than __) and avoid &quot;breaking&quot; existing code that uses __.<br=
>
<br>
</span>_ is not reserved to the compiler and is VERY often #defined to gett=
ext.<br></blockquote><div><br></div><div>Only as a function-like macro.</di=
v><div><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex">
Let&#39;s use __.</blockquote><div><br></div><div>Let&#39;s use the thing t=
hat works best for C++, sure. I am not (yet) convinced that&#39;s __.</div>=
</div></div></div></blockquote></span><div><br>Well, let&#39;s look at the =
options.<br><br>You can&#39;t use nothing; that would create parsing ambigu=
ities. So you have to put something there: either an identifier or somethin=
g that is not an identifier.<br><br>If it is not an identifier, then it mus=
t be a keyword (new or old) or some form of punctuation. Adding a new keywo=
rd for something like this is rather silly. And I don&#39;t know of an old =
keyword that would make for a good placeholder.<br><br>You could use `[]` a=
s I once suggested, piggybacking off of structured binding rules. But most =
other punctuation would be confusing or otherwise unexpected in a variable =
declaration.<br><br>If it is an identifier, then it must be a <i>reserved</=
i> identifier, to minimize code breakage when we change its meaning.</div><=
/div></blockquote><div><br></div><div>As I pointed out, this is an incorrec=
t conclusion. There is no necessity for any code breakage here, and there i=
s no need to pick a reserved identifier: the core functionality of this pro=
posal does not require that the identifier be unusable within its scope, an=
d if we don&#39;t add that restriction, this is strictly an extension.</div=
><div><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8e=
x;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div>The sh=
ortest reserved identifier is `_`, which is currently reserved for use by t=
he implementation, but only for names in the global namespace. Which means =
that right now, this is 100% legal:<br><br><div style=3D"background-color:r=
gb(250,250,250);border-color:rgb(187,187,187);border-style:solid;border-wid=
th:1px" class=3D"m_6865967731990214384prettyprint"><code class=3D"m_6865967=
731990214384prettyprint"><div class=3D"m_6865967731990214384subprettyprint"=
><span style=3D"color:#008" class=3D"m_6865967731990214384styled-by-prettif=
y">namespace</span><span style=3D"color:#000" class=3D"m_686596773199021438=
4styled-by-prettify"> foo<br></span><span style=3D"color:#660" class=3D"m_6=
865967731990214384styled-by-prettify">{</span><span style=3D"color:#000" cl=
ass=3D"m_6865967731990214384styled-by-prettify"><br>=C2=A0 </span><span sty=
le=3D"color:#008" class=3D"m_6865967731990214384styled-by-prettify">constex=
pr</span><span style=3D"color:#000" class=3D"m_6865967731990214384styled-by=
-prettify"> </span><span style=3D"color:#008" class=3D"m_686596773199021438=
4styled-by-prettify">int</span><span style=3D"color:#000" class=3D"m_686596=
7731990214384styled-by-prettify"> _ </span><span style=3D"color:#660" class=
=3D"m_6865967731990214384styled-by-prettify">=3D</span><span style=3D"color=
:#000" class=3D"m_6865967731990214384styled-by-prettify"> </span><span styl=
e=3D"color:#066" class=3D"m_6865967731990214384styled-by-prettify">20</span=
><span style=3D"color:#660" class=3D"m_6865967731990214384styled-by-prettif=
y">;</span><span style=3D"color:#000" class=3D"m_6865967731990214384styled-=
by-prettify"><br></span><span style=3D"color:#660" class=3D"m_6865967731990=
214384styled-by-prettify">}</span></div></code></div><br>So changing the me=
aning of that code is a non-starter.<br><br>The second shortest reserved id=
entifiers are of the form `_*`, where `*` is an uppercase letter or `_`. Th=
ese are reserved by the implementation for <i>any use</i>. And implementati=
ons are more easily changed than user code.<br><br>So from my perspective, =
`__` is the most viable identifier.<br></div></div><span class=3D"">

<p></p>

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</blockquote></div><br></div></div>

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> Il giorno 02 apr 2017, alle ore 22:10, Richard Smith <richard@metafoo.co.=
uk> ha scritto:
>=20
> On 2 April 2017 at 12:56, Alberto Barbati <albertobarbati@gmail.com <mail=
to:albertobarbati@gmail.com>> wrote:
> Il giorno 02 apr 2017, alle ore 20:03, Thiago Macieira <thiago@macieira.o=
rg <mailto:thiago@macieira.org>> ha scritto:
>=20
> >> On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard Smith wrote:
> >> Have you considered that possibility? It would give a better name (_ r=
ather
> >> than __) and avoid "breaking" existing code that uses __.
> >
> > _ is not reserved to the compiler and is VERY often #defined to gettext=
..
>=20
> Thank you Richard for your suggestion which is very interesting, since it=
 provides good insights about a possible wording. As for the name, I believ=
e Thiago and Magnus raised valid concerns, though. It's true that the we mi=
ght choose _ without breaking existing code. However defining _ as a macro =
is currently valid and apparently widely used. I believe we therefore have =
only two choices: either we make such uses undefined behavior (upsetting a =
lot of people) or we choose wording to avoid that (making the feature essen=
tially unusable for users of all libraries like gettext). None of the two a=
pproaches seems very good. Is there a third option?
>=20
> As noted, gettext defines _ as a function-like macro, so there seems to b=
e no technical problem for users of gettext (although some might consider o=
verloading the meaning of _ in this way to be a readability problem).

I guess the proposal might use an assessment of the usage of _ as a macro n=
ame.

However, I am a bit worried about this:

  unique_lock _ (mutex1); // ok, _ is an identifier
  unique_lock _(mutex2); // ops! may not compile if I #include gettext

>=20
> __ seems somewhat safer and less controversial.
>=20
> I would expect you'll find controversy if you pick a worse name in order =
to avoid collision with a macro name that some would already consider to be=
 poorly chosen, so I don't think it's clear which will be less controversia=
l.

Duly noted. By the way, I personally don=E2=80=99t think __ is much worse t=
han _. This seems very subjective to me.

Alberto

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html charset=
=3Dutf-8"></head><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: s=
pace; -webkit-line-break: after-white-space;" class=3D""><br class=3D""><di=
v><blockquote type=3D"cite" class=3D""><div class=3D"">Il giorno 02 apr 201=
7, alle ore 22:10, Richard Smith &lt;<a href=3D"mailto:richard@metafoo.co.u=
k" class=3D"">richard@metafoo.co.uk</a>&gt; ha scritto:</div><br class=3D"A=
pple-interchange-newline"><div class=3D""><div dir=3D"ltr" class=3D""><div =
class=3D"gmail_extra"><div class=3D"gmail_quote">On 2 April 2017 at 12:56, =
Alberto Barbati <span dir=3D"ltr" class=3D"">&lt;<a href=3D"mailto:albertob=
arbati@gmail.com" target=3D"_blank" class=3D"">albertobarbati@gmail.com</a>=
&gt;</span> wrote:<br class=3D""><blockquote class=3D"gmail_quote" style=3D=
"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=
=3D"">Il giorno 02 apr 2017, alle ore 20:03, Thiago Macieira &lt;<a href=3D=
"mailto:thiago@macieira.org" target=3D"_blank" class=3D"">thiago@macieira.o=
rg</a>&gt; ha scritto:<br class=3D"">
<br class=3D"">
&gt;&gt; On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard Smith wrot=
e:<br class=3D"">
&gt;&gt; Have you considered that possibility? It would give a better name =
(_ rather<br class=3D"">
&gt;&gt; than __) and avoid "breaking" existing code that uses __.<br class=
=3D"">
&gt;<br class=3D"">
&gt; _ is not reserved to the compiler and is VERY often #defined to gettex=
t.<br class=3D"">
<br class=3D"">
</span>Thank you Richard for your suggestion which is very interesting, sin=
ce it provides good insights about a possible wording. As for the name, I b=
elieve Thiago and Magnus raised valid concerns, though. It's true that the =
we might choose _ without breaking existing code. However defining _ as a m=
acro is currently valid and apparently widely used. I believe we therefore =
have only two choices: either we make such uses undefined behavior (upsetti=
ng a lot of people) or we choose wording to avoid that (making the feature =
essentially unusable for users of all libraries like gettext). None of the =
two approaches seems very good. Is there a third option?<br class=3D""></bl=
ockquote><div class=3D""><br class=3D""></div><div class=3D"">As noted, get=
text defines _ as a function-like macro, so there seems to be no technical =
problem for users of gettext (although some might consider overloading the =
meaning of _ in this way to be a readability problem).</div></div></div></d=
iv></div></blockquote><div><br class=3D""></div><div>I guess the proposal m=
ight use an assessment of the usage of _ as a macro name.</div><div><br cla=
ss=3D""></div><div>However, I am a bit worried about this:</div><div><br cl=
ass=3D""></div><div>&nbsp; unique_lock _ (mutex1); // ok, _ is an identifie=
r</div><div>&nbsp; unique_lock _(mutex2); // ops! may not compile if I #inc=
lude gettext</div><div><br class=3D""></div><blockquote type=3D"cite" class=
=3D""><div class=3D""><div dir=3D"ltr" class=3D""><div class=3D"gmail_extra=
"><div class=3D"gmail_quote"><div class=3D""><br class=3D""></div><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex">
__ seems somewhat safer and less controversial.</blockquote><div class=3D""=
><br class=3D""></div><div class=3D"">I would expect you'll find controvers=
y if you pick a worse name in order to avoid collision with a macro name th=
at some would already consider to be poorly chosen, so I don't think it's c=
lear which will be less controversial.</div></div></div></div></div></block=
quote><br class=3D""></div><div>Duly noted. By the way, I personally don=E2=
=80=99t think __ is much worse than _. This seems very subjective to me.</d=
iv><div><br class=3D""></div><div>Alberto</div><br class=3D""></body></html=
>

<p></p>

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On Sunday, April 2, 2017 at 4:13:36 PM UTC-4, Richard Smith wrote:
>
> On 2 April 2017 at 12:45, Nicol Bolas <jmck...@gmail.com <javascript:>>=
=20
> wrote:
>
>> On Sunday, April 2, 2017 at 3:28:54 PM UTC-4, Richard Smith wrote:
>>>
>>> On 2 April 2017 at 11:03, Thiago Macieira <thi...@macieira.org> wrote:
>>>
>>>> On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard Smith wrote:
>>>> > Have you considered that possibility? It would give a better name (_=
=20
>>>> rather
>>>> > than __) and avoid "breaking" existing code that uses __.
>>>>
>>>> _ is not reserved to the compiler and is VERY often #defined to gettex=
t.
>>>>
>>>
>>> Only as a function-like macro.
>>>
>>> Let's use __.
>>>
>>>
>>> Let's use the thing that works best for C++, sure. I am not (yet)=20
>>> convinced that's __.
>>>
>>
>> Well, let's look at the options.
>>
>> You can't use nothing; that would create parsing ambiguities. So you hav=
e=20
>> to put something there: either an identifier or something that is not an=
=20
>> identifier.
>>
>> If it is not an identifier, then it must be a keyword (new or old) or=20
>> some form of punctuation. Adding a new keyword for something like this i=
s=20
>> rather silly. And I don't know of an old keyword that would make for a g=
ood=20
>> placeholder.
>>
>> You could use `[]` as I once suggested, piggybacking off of structured=
=20
>> binding rules. But most other punctuation would be confusing or otherwis=
e=20
>> unexpected in a variable declaration.
>>
>> If it is an identifier, then it must be a *reserved* identifier, to=20
>> minimize code breakage when we change its meaning.
>>
>
> As I pointed out, this is an incorrect conclusion. There is no necessity=
=20
> for any code breakage here, and there is no need to pick a reserved=20
> identifier: the core functionality of this proposal does not require that=
=20
> the identifier be unusable within its scope, and if we don't add that=20
> restriction, this is strictly an extension.
>

But that makes it a *different proposal*. This proposal is about having a=
=20
scope-bound object which *cannot be later referenced*, which has a name=20
that is generated by the compiler. That's what the proposal is for: "for=20
all variables whose name is not important and that is no longer needed=20
after declaration".

You are talking about something else.

--=20
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<div dir=3D"ltr">On Sunday, April 2, 2017 at 4:13:36 PM UTC-4, Richard Smit=
h wrote:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-left: 0=
..8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir=3D"ltr"><div>=
<div class=3D"gmail_quote">On 2 April 2017 at 12:45, Nicol Bolas <span dir=
=3D"ltr">&lt;<a href=3D"javascript:" target=3D"_blank" gdf-obfuscated-mailt=
o=3D"lUG55sFXCQAJ" rel=3D"nofollow" onmousedown=3D"this.href=3D&#39;javascr=
ipt:&#39;;return true;" onclick=3D"this.href=3D&#39;javascript:&#39;;return=
 true;">jmck...@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex"><div dir=3D"ltr">On Sunday, April 2, 2017 at 3:28:54 PM UTC-4, Richa=
rd Smith wrote:<span><blockquote class=3D"gmail_quote" style=3D"margin:0;ma=
rgin-left:0.8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"lt=
r"><div><div class=3D"gmail_quote">On 2 April 2017 at 11:03, Thiago Macieir=
a <span dir=3D"ltr">&lt;<a rel=3D"nofollow">thi...@macieira.org</a>&gt;</sp=
an> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;=
border-left:1px #ccc solid;padding-left:1ex"><span>On s=C3=A1bado, 1 de abr=
il de 2017 21:19:37 PDT Richard Smith wrote:<br>
&gt; Have you considered that possibility? It would give a better name (_ r=
ather<br>
&gt; than __) and avoid &quot;breaking&quot; existing code that uses __.<br=
>
<br>
</span>_ is not reserved to the compiler and is VERY often #defined to gett=
ext.<br></blockquote><div><br></div><div>Only as a function-like macro.</di=
v><div><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex">
Let&#39;s use __.</blockquote><div><br></div><div>Let&#39;s use the thing t=
hat works best for C++, sure. I am not (yet) convinced that&#39;s __.</div>=
</div></div></div></blockquote></span><div><br>Well, let&#39;s look at the =
options.<br><br>You can&#39;t use nothing; that would create parsing ambigu=
ities. So you have to put something there: either an identifier or somethin=
g that is not an identifier.<br><br>If it is not an identifier, then it mus=
t be a keyword (new or old) or some form of punctuation. Adding a new keywo=
rd for something like this is rather silly. And I don&#39;t know of an old =
keyword that would make for a good placeholder.<br><br>You could use `[]` a=
s I once suggested, piggybacking off of structured binding rules. But most =
other punctuation would be confusing or otherwise unexpected in a variable =
declaration.<br><br>If it is an identifier, then it must be a <i>reserved</=
i> identifier, to minimize code breakage when we change its meaning.</div><=
/div></blockquote><div><br></div><div>As I pointed out, this is an incorrec=
t conclusion. There is no necessity for any code breakage here, and there i=
s no need to pick a reserved identifier: the core functionality of this pro=
posal does not require that the identifier be unusable within its scope, an=
d if we don&#39;t add that restriction, this is strictly an extension.</div=
></div></div></div></blockquote><div><br>But that makes it a <i>different p=
roposal</i>. This proposal is about having a scope-bound object which <i>ca=
nnot be later referenced</i>, which has a name that is generated by the com=
piler. That&#39;s what the proposal is for: &quot;for all variables whose n=
ame is not important and that is no longer needed after declaration&quot;.<=
br><br>You are talking about something else.</div></div>

<p></p>

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com/a/isocpp.org/d/msgid/std-proposals/5d35116c-5974-417a-840f-3dc714eae601=
%40isocpp.org</a>.<br />

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On Sunday, April 2, 2017 at 4:10:38 PM UTC-4, Richard Smith wrote:
>
> On 2 April 2017 at 12:56, Alberto Barbati <alberto...@gmail.com=20
> <javascript:>> wrote:
>
>> Il giorno 02 apr 2017, alle ore 20:03, Thiago Macieira <
>> thi...@macieira.org <javascript:>> ha scritto:
>>
>> >> On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard Smith wrote:
>> >> Have you considered that possibility? It would give a better name (_=
=20
>> rather
>> >> than __) and avoid "breaking" existing code that uses __.
>> >
>> > _ is not reserved to the compiler and is VERY often #defined to gettex=
t.
>>
>> Thank you Richard for your suggestion which is very interesting, since i=
t=20
>> provides good insights about a possible wording. As for the name, I beli=
eve=20
>> Thiago and Magnus raised valid concerns, though. It's true that the we=
=20
>> might choose _ without breaking existing code. However defining _ as a=
=20
>> macro is currently valid and apparently widely used. I believe we theref=
ore=20
>> have only two choices: either we make such uses undefined behavior=20
>> (upsetting a lot of people) or we choose wording to avoid that (making t=
he=20
>> feature essentially unusable for users of all libraries like gettext). N=
one=20
>> of the two approaches seems very good. Is there a third option?
>>
>
> As noted, gettext defines _ as a function-like macro, so there seems to b=
e=20
> no technical problem for users of gettext (although some might consider=
=20
> overloading the meaning of _ in this way to be a readability problem).
>

But we can't do that. As previously mentioned, this does break valid code:

namespace Name
{
  int _ =3D 5;
};

`_` is only reserved for implementation use in the global namespace. That=
=20
name is not in a global namespace, so it's perfectly fine for users to use=
=20
it.

Using it for this feature would change this code, such that the variable is=
=20
no longer accessible.

__ seems somewhat safer and less controversial.
>
>
> I would expect you'll find controversy if you pick a worse name in order=
=20
> to avoid collision with a macro name that some would already consider to =
be=20
> poorly chosen, so I don't think it's clear which will be less controversi=
al.
>

I've yet to see evidence that `__` is in any technical way worse than `_`.

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<div dir=3D"ltr"><br><br>On Sunday, April 2, 2017 at 4:10:38 PM UTC-4, Rich=
ard Smith wrote:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin=
-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir=3D"lt=
r"><div><div class=3D"gmail_quote">On 2 April 2017 at 12:56, Alberto Barbat=
i <span dir=3D"ltr">&lt;<a href=3D"javascript:" target=3D"_blank" gdf-obfus=
cated-mailto=3D"AIL6XZhXCQAJ" rel=3D"nofollow" onmousedown=3D"this.href=3D&=
#39;javascript:&#39;;return true;" onclick=3D"this.href=3D&#39;javascript:&=
#39;;return true;">alberto...@gmail.com</a>&gt;</span> wrote:<br><blockquot=
e class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc sol=
id;padding-left:1ex"><span>Il giorno 02 apr 2017, alle ore 20:03, Thiago Ma=
cieira &lt;<a href=3D"javascript:" target=3D"_blank" gdf-obfuscated-mailto=
=3D"AIL6XZhXCQAJ" rel=3D"nofollow" onmousedown=3D"this.href=3D&#39;javascri=
pt:&#39;;return true;" onclick=3D"this.href=3D&#39;javascript:&#39;;return =
true;">thi...@macieira.org</a>&gt; ha scritto:<br>
<br>
&gt;&gt; On s=C3=A1bado, 1 de abril de 2017 21:19:37 PDT Richard Smith wrot=
e:<br>
&gt;&gt; Have you considered that possibility? It would give a better name =
(_ rather<br>
&gt;&gt; than __) and avoid &quot;breaking&quot; existing code that uses __=
..<br>
&gt;<br>
&gt; _ is not reserved to the compiler and is VERY often #defined to gettex=
t.<br>
<br>
</span>Thank you Richard for your suggestion which is very interesting, sin=
ce it provides good insights about a possible wording. As for the name, I b=
elieve Thiago and Magnus raised valid concerns, though. It&#39;s true that =
the we might choose _ without breaking existing code. However defining _ as=
 a macro is currently valid and apparently widely used. I believe we theref=
ore have only two choices: either we make such uses undefined behavior (ups=
etting a lot of people) or we choose wording to avoid that (making the feat=
ure essentially unusable for users of all libraries like gettext). None of =
the two approaches seems very good. Is there a third option?<br></blockquot=
e><div><br></div><div>As noted, gettext defines _ as a function-like macro,=
 so there seems to be no technical problem for users of gettext (although s=
ome might consider overloading the meaning of _ in this way to be a readabi=
lity problem).</div></div></div></div></blockquote><div><br>But we can&#39;=
t do that. As previously mentioned, this does break valid code:<br><br><div=
 style=3D"background-color: rgb(250, 250, 250); border-color: rgb(187, 187,=
 187); border-style: solid; border-width: 1px; overflow-wrap: break-word;" =
class=3D"prettyprint"><code class=3D"prettyprint"><div class=3D"subprettypr=
int"><span style=3D"color: #008;" class=3D"styled-by-prettify">namespace</s=
pan><span style=3D"color: #000;" class=3D"styled-by-prettify"> </span><span=
 style=3D"color: #606;" class=3D"styled-by-prettify">Name</span><span style=
=3D"color: #000;" class=3D"styled-by-prettify"><br></span><span style=3D"co=
lor: #660;" class=3D"styled-by-prettify">{</span><span style=3D"color: #000=
;" class=3D"styled-by-prettify"><br>=C2=A0 </span><span style=3D"color: #00=
8;" class=3D"styled-by-prettify">int</span><span style=3D"color: #000;" cla=
ss=3D"styled-by-prettify"> _ </span><span style=3D"color: #660;" class=3D"s=
tyled-by-prettify">=3D</span><span style=3D"color: #000;" class=3D"styled-b=
y-prettify"> </span><span style=3D"color: #066;" class=3D"styled-by-prettif=
y">5</span><span style=3D"color: #660;" class=3D"styled-by-prettify">;</spa=
n><span style=3D"color: #000;" class=3D"styled-by-prettify"><br></span><spa=
n style=3D"color: #660;" class=3D"styled-by-prettify">};</span><span style=
=3D"color: #000;" class=3D"styled-by-prettify"><br></span></div></code></di=
v><br>`_` is only reserved for implementation use in the global namespace. =
That name is not in a global namespace, so it&#39;s perfectly fine for user=
s to use it.<br><br>Using it for this feature would change this code, such =
that the variable is no longer accessible.<br><br></div><blockquote class=
=3D"gmail_quote" style=3D"margin: 0;margin-left: 0.8ex;border-left: 1px #cc=
c solid;padding-left: 1ex;"><div dir=3D"ltr"><div><div class=3D"gmail_quote=
"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:=
1px #ccc solid;padding-left:1ex">
__ seems somewhat safer and less controversial.</blockquote><div><br></div>=
<div>I would expect you&#39;ll find controversy if you pick a worse name in=
 order to avoid collision with a macro name that some would already conside=
r to be poorly chosen, so I don&#39;t think it&#39;s clear which will be le=
ss controversial.</div></div></div></div></blockquote><div><br>I&#39;ve yet=
 to see evidence that `__` is in any technical way worse than `_`.<br></div=
></div>

<p></p>

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.

On domingo, 2 de abril de 2017 13:10:14 PDT Richard Smith wrote:
> As noted, gettext defines _ as a function-like macro,

Even as a function-like macro, it wouldn't work:

 std::lock_guard _(mutex);

--
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center

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>
>
>> If it is an identifier, then it must be a *reserved* identifier, to
>> minimize code breakage when we change its meaning.
>>
>
> As I pointed out, this is an incorrect conclusion. There is no necessity
> for any code breakage here, and there is no need to pick a reserved
> identifier: the core functionality of this proposal does not require that
> the identifier be unusable within its scope, and if we don't add that
> restriction, this is strictly an extension.
>
>
I think the logical extreme of this idea is to not pick any identifier at
all - simply allow hiding declarations in the same scope. So from the
original paper's examples, using __ to declare multiple variables in the
same scope just works not because of some special magic bestowed upon the
identifier "__", but instead because you're actually declaring multiple
variables in the same scope named "__". You'd have no way of accessing the
earlier versions of __, but then you don't want to anyway. I don't know how
to get the compiler to not warn against not using the last incarnation of
__ though. That just may be a "teach the compiler that this is a convention
that people want to use" kind of thing.

We'd have to change the scope rules for names, but I'm not sure that's any
worse than bestowing magic language meaning on a specific identifier.

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<div dir=3D"ltr"><blockquote class=3D"gmail_quote" style=3D"margin: 0;margi=
n-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir=3D"l=
tr"><div><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=
=3D"ltr"><div><br>If it is an identifier, then it must be a <i>reserved</i>=
 identifier, to minimize code breakage when we change its meaning.</div></d=
iv></blockquote><div><br></div><div>As I pointed out, this is an incorrect =
conclusion. There is no necessity for any code breakage here, and there is =
no need to pick a reserved identifier: the core functionality of this propo=
sal does not require that the identifier be unusable within its scope, and =
if we don&#39;t add that restriction, this is strictly an extension.</div><=
div><br></div></div></div></div></blockquote><div><br></div><div>I think th=
e logical extreme of this idea is to not pick any identifier at all - simpl=
y allow hiding declarations in the same scope. So from the original paper&#=
39;s examples, using __ to declare multiple variables in the same scope jus=
t works not because of some special magic bestowed upon the identifier &quo=
t;__&quot;, but instead because you&#39;re actually declaring multiple vari=
ables in the same scope named &quot;__&quot;. You&#39;d have no way of acce=
ssing the earlier versions of __, but then you don&#39;t want to anyway. I =
don&#39;t know how to get the compiler to not warn against not using the la=
st incarnation of __ though. That just may be a &quot;teach the compiler th=
at this is a convention that people want to use&quot; kind of thing.=C2=A0<=
/div><div><br></div><div>We&#39;d have to change the scope rules for names,=
 but I&#39;m not sure that&#39;s any worse than bestowing magic language me=
aning on a specific identifier.=C2=A0</div></div>

<p></p>

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%40isocpp.org</a>.<br />

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.

On 2017-04-03 15:37, Barry Revzin wrote:
> I think the logical extreme of this idea is to not pick any identifier at
> all - simply allow hiding declarations in the same scope. So from the
> original paper's examples, using __ to declare multiple variables in the
> same scope just works not because of some special magic bestowed upon the
> identifier "__", but instead because you're actually declaring multiple
> variables in the same scope named "__". You'd have no way of accessing the
> earlier versions of __, but then you don't want to anyway. I don't know how
> to get the compiler to not warn against not using the last incarnation of
> __ though. That just may be a "teach the compiler that this is a convention
> that people want to use" kind of thing.

That seems like a recipe for bugs. We have enough problems with -Wshadow
as it is, let alone making the situation *worse*...

--
Matthew

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On Monday, April 3, 2017 at 3:55:16 PM UTC-4, Matthew Woehlke wrote:
>
> On 2017-04-03 15:37, Barry Revzin wrote:
> > I think the logical extreme of this idea is to not pick any identifier
> at
> > all - simply allow hiding declarations in the same scope. So from the
> > original paper's examples, using __ to declare multiple variables in the
> > same scope just works not because of some special magic bestowed upon
> the
> > identifier "__", but instead because you're actually declaring multiple
> > variables in the same scope named "__". You'd have no way of accessing
> the
> > earlier versions of __, but then you don't want to anyway. I don't know
> how
> > to get the compiler to not warn against not using the last incarnation
> of
> > __ though. That just may be a "teach the compiler that this is a
> convention
> > that people want to use" kind of thing.
>
> That seems like a recipe for bugs. We have enough problems with -Wshadow
> as it is, let alone making the situation *worse*...
>
>
I think the original idea Richard posited is that there is no hiding.
Instead, if you declare multiple variables with the same name in the same
scope, you can't access *any* of them. Name lookup will simply find all the
declarations and declare an ambiguity at that point.

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<div dir=3D"ltr"><br><br>On Monday, April 3, 2017 at 3:55:16 PM UTC-4, Matt=
hew Woehlke wrote:<blockquote class=3D"gmail_quote" style=3D"margin: 0;marg=
in-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">On 2017-04-0=
3 15:37, Barry Revzin wrote:
<br>&gt; I think the logical extreme of this idea is to not pick any identi=
fier at=20
<br>&gt; all - simply allow hiding declarations in the same scope. So from =
the=20
<br>&gt; original paper&#39;s examples, using __ to declare multiple variab=
les in the=20
<br>&gt; same scope just works not because of some special magic bestowed u=
pon the=20
<br>&gt; identifier &quot;__&quot;, but instead because you&#39;re actually=
 declaring multiple=20
<br>&gt; variables in the same scope named &quot;__&quot;. You&#39;d have n=
o way of accessing the=20
<br>&gt; earlier versions of __, but then you don&#39;t want to anyway. I d=
on&#39;t know how=20
<br>&gt; to get the compiler to not warn against not using the last incarna=
tion of=20
<br>&gt; __ though. That just may be a &quot;teach the compiler that this i=
s a convention=20
<br>&gt; that people want to use&quot; kind of thing.=20
<br>
<br>That seems like a recipe for bugs. We have enough problems with -Wshado=
w
<br>as it is, let alone making the situation *worse*...
<br>
<br></blockquote><div><br></div><div>I think the original idea Richard posi=
ted is that there is no hiding. Instead, if you declare multiple variables =
with the same name in the same scope, you can&#39;t access *any* of them. N=
ame lookup will simply find all the declarations and declare an ambiguity a=
t that point.</div></div>

<p></p>

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Maybe an existing keyword could be used instead. Something like:
    unique_lock auto {lock};
or
    unique_lock default {lock};

or some other keyword.

On Monday, March 27, 2017 at 3:27:11 PM UTC-5, Alberto Barbati wrote:
>
> Hello,
>
> this is a draft for a proposal to add a special meaning to the identifier
> __ (double underscore) so that it can be used (even repeatedly in the same
> lexical scope) for all variables whose name is not important and that is no
> longer needed after declaration. The draft includes a few examples.
>
> Is there any interest in this?
>
> Thanks in advance,
>
> Alberto
>
>

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<div dir=3D"ltr">Maybe an existing keyword could be used instead. Something=
 like: <br><div style=3D"background-color: rgb(250, 250, 250); border-color=
: rgb(187, 187, 187); border-style: solid; border-width: 1px; overflow-wrap=
: break-word;" class=3D"prettyprint"><code class=3D"prettyprint"><div class=
=3D"subprettyprint"><span style=3D"color: #000;" class=3D"styled-by-prettif=
y">=C2=A0 =C2=A0 unique_lock </span><span style=3D"color: #008;" class=3D"s=
tyled-by-prettify">auto</span><span style=3D"color: #000;" class=3D"styled-=
by-prettify"> </span><span style=3D"color: #660;" class=3D"styled-by-pretti=
fy">{</span><span style=3D"color: #008;" class=3D"styled-by-prettify">lock<=
/span><span style=3D"color: #660;" class=3D"styled-by-prettify">};</span></=
div></code></div>or<br><div style=3D"background-color: rgb(250, 250, 250); =
border-color: rgb(187, 187, 187); border-style: solid; border-width: 1px; o=
verflow-wrap: break-word;" class=3D"prettyprint"><code class=3D"prettyprint=
"><div class=3D"subprettyprint"><span style=3D"color: #000;" class=3D"style=
d-by-prettify">=C2=A0 =C2=A0 unique_lock </span><span style=3D"color: #008;=
" class=3D"styled-by-prettify">default</span><span style=3D"color: #000;" c=
lass=3D"styled-by-prettify"> </span><span style=3D"color: #660;" class=3D"s=
tyled-by-prettify">{</span><span style=3D"color: #008;" class=3D"styled-by-=
prettify">lock</span><span style=3D"color: #660;" class=3D"styled-by-pretti=
fy">};</span></div></code></div><br>or some other keyword. <br><br>On Monda=
y, March 27, 2017 at 3:27:11 PM UTC-5, Alberto Barbati wrote:<blockquote cl=
ass=3D"gmail_quote" style=3D"margin: 0;margin-left: 0.8ex;border-left: 1px =
#ccc solid;padding-left: 1ex;"><div dir=3D"ltr">Hello,<br><br>this is a dra=
ft for a proposal to add a special meaning to the identifier __ (double und=
erscore) so that it can be used (even repeatedly in the same lexical scope)=
 for all variables whose name is not important and that is no longer needed=
 after declaration. The draft includes a few examples.<br><br>Is there any =
interest in this?<br><br>Thanks in advance,<br><br>Alberto<br><br></div></b=
lockquote></div>

<p></p>

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Was a #unique-id,  #id  or #__ preprocessor like syntax considered before
for this reason?

void demo_scope_exit_fail_success()
{
 std::ostringstream out {};
 auto lam = [&]{out << "called ";};
 try{
   scope_exit     *#id* {[&]{out << "always ";}};
   scope_success  *#unique_id* {[&]{out << "not ";}};
   scope_fail     *#__* {lam};
   ...


Peter

On Monday, March 27, 2017 at 10:27:11 PM UTC+2, Alberto Barbati wrote:
>
> Hello,
>
> this is a draft for a proposal to add a special meaning to the identifier
> __ (double underscore) so that it can be used (even repeatedly in the same
> lexical scope) for all variables whose name is not important and that is no
> longer needed after declaration. The draft includes a few examples.
>
> Is there any interest in this?
>
> Thanks in advance,
>
> Alberto
>
>

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<div dir=3D"ltr">Was a <font face=3D"courier new, monospace">#unique-id,</f=
ont>=C2=A0=C2=A0<font face=3D"courier new, monospace">#id</font>=C2=A0 or <=
font face=3D"courier new, monospace">#__</font> preprocessor like syntax co=
nsidered before for this reason?<div><br></div><div><font face=3D"courier n=
ew, monospace">void demo_scope_exit_fail_success()<br>{<br>=C2=A0std::ostri=
ngstream out {};<br>=C2=A0auto lam =3D [&amp;]{out &lt;&lt; &quot;called &q=
uot;;};<br>=C2=A0try{<br>=C2=A0 =C2=A0scope_exit =C2=A0 =C2=A0 <b>#id</b>=
=C2=A0{[&amp;]{out &lt;&lt; &quot;always &quot;;}};<br>=C2=A0 =C2=A0scope_s=
uccess =C2=A0<b>#unique_id</b>=C2=A0{[&amp;]{out &lt;&lt; &quot;not &quot;;=
}};<br>=C2=A0 =C2=A0scope_fail =C2=A0 =C2=A0 <b>#__</b>=C2=A0{lam};</font><=
/div><div><font face=3D"courier new, monospace">=C2=A0 =C2=A0...<br></font>=
<div><div><br></div></div><div><br></div><div>Peter<br><br>On Monday, March=
 27, 2017 at 10:27:11 PM UTC+2, Alberto Barbati wrote:<blockquote class=3D"=
gmail_quote" style=3D"margin: 0;margin-left: 0.8ex;border-left: 1px #ccc so=
lid;padding-left: 1ex;"><div dir=3D"ltr">Hello,<br><br>this is a draft for =
a proposal to add a special meaning to the identifier __ (double underscore=
) so that it can be used (even repeatedly in the same lexical scope) for al=
l variables whose name is not important and that is no longer needed after =
declaration. The draft includes a few examples.<br><br>Is there any interes=
t in this?<br><br>Thanks in advance,<br><br>Alberto<br><br></div></blockquo=
te></div></div></div>

<p></p>

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> Il giorno 03 apr 2017, alle ore 00:45, Nicol Bolas <jmckesson@gmail.com> =
ha scritto:
>=20
> This proposal is about having a scope-bound object which cannot be later =
referenced, which has a name that is generated by the compiler. That's what=
 the proposal is for: "for all variables whose name is not important and th=
at is no longer needed after declaration".

Sorry to have left the thread for so long. After some pondering, although t=
he __ approach is still on the table, I have decided to explore a bit furth=
er other options that do not require reserving an identifier, in particular=
 the one suggested by Nicol Bolas. The fact is that I realized C++17 alread=
y has a tool that creates an object that cannot be referenced...  that tool=
 is decomposition declaration itself. With just three tweaks, which would m=
ake for a pure extension, we can achieve both goals of my proposal.

Tweak #1

Allow identifiers in a decomposition declaration to be omitted. So in

    auto [x, , z] =3D func();

the second element is not named so the corresponding element needs not be b=
ound and get<1>() is guaranteed not to be called (however, we might still c=
heck that it might have been called, for consistency).

This tweak alone solves goal #2 of the proposal and is probably more elegan=
t: since there's no name, there's little room for misunderstanding about th=
e semantic.

Tweak #2

Make [] a special case by allowing it for all types: in this particular cas=
e, tuple_size<>, tuple_element<> and  get<>() functions are not required no=
r called. We would therefore be able to write:

    auto [] =3D lock_guard{m};

even if lock_guard does not have a tuple-like interface. This actually solv=
es goal #1! In fact, the declaration instantiate the "hidden" object, which=
 is destroyed at the end of scope, as usual. It  simply doesn't bind it to =
a name.

There's only one drawback: since decomposition declarations mandate the use=
 of auto, the syntax seems unnecessarily verbose.

Tweak #3

Allow the decl-specifier-seq in a decomposition declaration to be different=
 from auto. This would allow to write the code above more concisely:

    lock_guard [] {m};

Incidentally, this tweak would provide greater control over "normal" decomp=
osition declarations too, giving a concise syntax to coerce the type of the=
 hidden object.

Tweak #3 is probably the most problematic part. I admit I didn't follow the=
 discussion that brought to the current wording of decomposition declaratio=
ns, but I'm sure it has been discussed before and if there weren't problems=
 it would probably have been allowed already. If anyone has pointers to sha=
re about that they are definitely welcome.

Alberto


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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=
=3Dutf-8"></head><body dir=3D"auto"><div><span></span></div><div><meta http=
-equiv=3D"content-type" content=3D"text/html; charset=3Dutf-8"><div><span><=
/span></div><div><meta http-equiv=3D"content-type" content=3D"text/html; ch=
arset=3Dutf-8"><div></div><div><br></div><div>Il giorno 03 apr 2017, alle o=
re 00:45, Nicol Bolas &lt;<a href=3D"mailto:jmckesson@gmail.com">jmckesson@=
gmail.com</a>&gt; ha scritto:<br><br></div><blockquote type=3D"cite"><div>T=
his proposal is about having a scope-bound object which <i>cannot be later =
referenced</i>, which has a name that is generated by the compiler. That's =
what the proposal is for: "for all variables whose name is not important an=
d that is no longer needed after declaration".</div></blockquote><br><div>S=
orry to have left the thread for so long. After some pondering, although th=
e __ approach is still on the table, I have decided to explore a bit furthe=
r other options that do not require reserving an identifier, in particular =
the one suggested by Nicol Bolas. The fact is that I realized C++17 already=
 has a tool that creates an object that cannot be referenced... &nbsp;that =
tool is decomposition declaration itself. With just three tweaks, which wou=
ld make for a pure extension, we can achieve both goals of my proposal.</di=
v><div><br></div><div>Tweak #1</div><div><br></div><div>Allow identifiers i=
n a decomposition declaration to be omitted. So in</div><div><br></div><div=
>&nbsp; &nbsp; auto [x, , z] =3D func();</div><div><br></div><div>the secon=
d element is not named so the corresponding element needs not be bound and =
get&lt;1&gt;() is guaranteed not to be called (however, we might still chec=
k that it might have been called, for consistency).</div><div><br></div><di=
v>This tweak alone solves goal #2 of the proposal and is probably more eleg=
ant: since there's no name, there's little room for misunderstanding about =
the semantic.</div><div><br></div><div>Tweak #2</div><div><br></div><div>Ma=
ke [] a special case by allowing it for all types: in this particular case,=
 tuple_size&lt;&gt;, tuple_element&lt;&gt; and &nbsp;get&lt;&gt;() function=
s are not required nor called. We would therefore be able to write:</div><d=
iv><br></div><div>&nbsp; &nbsp; auto [] =3D lock_guard{m};</div><div><br></=
div><div>even if lock_guard does not have a tuple-like interface. This actu=
ally solves goal #1! In fact, the declaration instantiate the "hidden" obje=
ct, which is destroyed at the end of scope, as usual. It &nbsp;simply doesn=
't bind it to a name.</div><div><br></div><div>There's only one drawback: s=
ince decomposition declarations mandate the use of auto, the syntax seems u=
nnecessarily verbose.</div><div><br></div><div>Tweak #3</div><div><br></div=
><div>Allow the decl-specifier-seq in a decomposition declaration to be dif=
ferent from auto. This would allow to write the code above more concisely:<=
/div><div><br></div><div><span style=3D"background-color: rgba(255, 255, 25=
5, 0);">&nbsp; &nbsp;&nbsp;lock_guard&nbsp;[] {m};</span></div><div><br></d=
iv><div><span style=3D"background-color: rgba(255, 255, 255, 0);">Incidenta=
lly, this tweak would provide greater control over "normal" decomposition d=
eclarations too, giving a concise syntax to coerce the type of the hidden o=
bject.</span></div><div><span style=3D"background-color: rgba(255, 255, 255=
, 0);"><br></span></div><div>Tweak #3 is probably the most problematic part=
.. I admit I didn't follow the discussion that brought to the current wordin=
g of decomposition declarations, but I'm sure it has been discussed before =
and if there weren't problems<span style=3D"background-color: rgba(255, 255=
, 255, 0);">&nbsp;it would probably have been allowed already. If anyone ha=
s pointers to share about that they are definitely welcome.</span></div><di=
v><span style=3D"background-color: rgba(255, 255, 255, 0);"><br></span></di=
v><div>Alberto</div><div><br></div><div><br></div></div></div></body></html=
>

<p></p>

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--001a11c16b40f2bd4d054cca6cd5
Content-Type: text/plain; charset=UTF-8

2017-04-10 1:10 GMT+02:00 Alberto Barbati <albertobarbati@gmail.com>:

>
> Il giorno 03 apr 2017, alle ore 00:45, Nicol Bolas <jmckesson@gmail.com>
> ha scritto:
>
> This proposal is about having a scope-bound object which *cannot be later
> referenced*, which has a name that is generated by the compiler. That's
> what the proposal is for: "for all variables whose name is not important
> and that is no longer needed after declaration".
>
>
> Sorry to have left the thread for so long. After some pondering, although
> the __ approach is still on the table, I have decided to explore a bit
> further other options that do not require reserving an identifier, in
> particular the one suggested by Nicol Bolas. The fact is that I realized
> C++17 already has a tool that creates an object that cannot be
> referenced...  that tool is decomposition declaration itself. With just
> three tweaks, which would make for a pure extension, we can achieve both
> goals of my proposal.
>
> Tweak #1
>
> Allow identifiers in a decomposition declaration to be omitted. So in
>
>     auto [x, , z] = func();
>
> the second element is not named so the corresponding element needs not be
> bound and get<1>() is guaranteed not to be called (however, we might still
> check that it might have been called, for consistency).
>
> This tweak alone solves goal #2 of the proposal and is probably more
> elegant: since there's no name, there's little room for misunderstanding
> about the semantic.
>

Won't this be annoying to read? It might be just me but I would still
prefer a placeholder for something like that.

Regards,

Domen

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<div dir=3D"ltr">2017-04-10 1:10 GMT+02:00 Alberto Barbati <span dir=3D"ltr=
">&lt;<a href=3D"mailto:albertobarbati@gmail.com" target=3D"_blank">alberto=
barbati@gmail.com</a>&gt;</span>:<br><div class=3D"gmail_extra"><div class=
=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"auto"><div><spa=
n></span></div><div><div><span></span></div><div><div></div><div><br></div>=
<div>Il giorno 03 apr 2017, alle ore 00:45, Nicol Bolas &lt;<a href=3D"mail=
to:jmckesson@gmail.com" target=3D"_blank">jmckesson@gmail.com</a>&gt; ha sc=
ritto:<br><br></div><blockquote type=3D"cite"><div>This proposal is about h=
aving a scope-bound object which <i>cannot be later referenced</i>, which h=
as a name that is generated by the compiler. That&#39;s what the proposal i=
s for: &quot;for all variables whose name is not important and that is no l=
onger needed after declaration&quot;.</div></blockquote><br><div>Sorry to h=
ave left the thread for so long. After some pondering, although the __ appr=
oach is still on the table, I have decided to explore a bit further other o=
ptions that do not require reserving an identifier, in particular the one s=
uggested by Nicol Bolas. The fact is that I realized C++17 already has a to=
ol that creates an object that cannot be referenced... =C2=A0that tool is d=
ecomposition declaration itself. With just three tweaks, which would make f=
or a pure extension, we can achieve both goals of my proposal.</div><div><b=
r></div><div>Tweak #1</div><div><br></div><div>Allow identifiers in a decom=
position declaration to be omitted. So in</div><div><br></div><div>=C2=A0 =
=C2=A0 auto [x, , z] =3D func();</div><div><br></div><div>the second elemen=
t is not named so the corresponding element needs not be bound and get&lt;1=
&gt;() is guaranteed not to be called (however, we might still check that i=
t might have been called, for consistency).</div><div><br></div><div>This t=
weak alone solves goal #2 of the proposal and is probably more elegant: sin=
ce there&#39;s no name, there&#39;s little room for misunderstanding about =
the semantic.</div></div></div></div></blockquote><div><br></div><div>Won&#=
39;t this be annoying to read? It might be just me but I would still prefer=
 a placeholder for something like that.<br><br></div><div>Regards,<br><br><=
/div><div>Domen<br></div></div><br></div></div>

<p></p>

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.

On 2017-04-03 16:28, T. C. wrote:
> if you declare multiple variables with the same name in the same
> scope, you can't access *any* of them. Name lookup will simply find
> all the declarations and declare an ambiguity at that point.

How's that going to work?

  auto x = ...;
  ... lots of code ...
  foo(..., x, ...);
  ... lots more code ...
  auto x = ...;

The compiler isn't going to parse the entire scope for variable
declarations first in order to "retroactively" forbid the earlier use of
`x`.

Is the intent that `x` can be used until the second declaration? That's
just... bizarre.

--
Matthew

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.