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According to the most recent paper for the proposed expected<,T, E> class
template,  p0323r5 <http://en.cppreference.com/w/cpp/utility/any/emplace>,
the return type of the emplace() method is void.   The  emplace() method of
std::optional<T> has recently been changed to return T&, in order  to
simplify code where the new value cannot be completely set with just a
constructor call.  Several other classes have had similar changes.  I think
that this same change should be made for the expected class, for the same
reason.

Joe Gottman

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<div dir=3D"ltr">According to the most recent paper for the proposed expect=
ed&lt;,T, E&gt; class template,=C2=A0=C2=A0<a href=3D"http://en.cppreferenc=
e.com/w/cpp/utility/any/emplace">p0323r5</a>, the return type of the emplac=
e() method is void.=C2=A0 =C2=A0The=C2=A0 emplace() method of std::optional=
&lt;T&gt; has recently been changed to return T&amp;, in order=C2=A0 to sim=
plify code where the new value cannot be completely set with just a constru=
ctor call.=C2=A0 Several other classes have had similar changes.=C2=A0 I th=
ink that this same change should be made for the expected class, for the sa=
me reason.<div><br></div><div>Joe Gottman</div></div>

<p></p>

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.

Le 18/02/2018 =C3=A0 13:51, Daniel Kr=C3=BCgler a =C3=A9crit=C2=A0:
> 2018-02-18 10:22 GMT+01:00 Ga=C5=A1per A=C5=BEman <gasper.azman@gmail.com=
>:
>> That's a great defect proposal. Report the issue to Hal, it needs wordin=
g,
>> no?
> A defect report wouldn't go to Hal, but to the lwgchair address, if
> what we are talking about would be part of the standard. But it
> currently isn't, so it should be reported to the authors of P0323R5
> instead. It is a bit confusing, that Joe Gottman linked p0323r5 not to
> the actual proposal, but to an internet page that talks about
> any::emplace. Here is the link to the paper Joe is talking about:
>
> http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0323r5.html
>
> - Daniel
>
Hi,

we missed this change to optional/any. We would add it in JAX.

Best,

Vicente

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.