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If I specify a generic lambda as a key comparison for an associative
container will it have an is_transparent typedef?

auto comp = []( const auto& x, const auto& y )
{
return boost::iequals( x, y );
}

map<string,int,decltype(comp)> m(comp);

// If I understand correctly this should not
// construct a temporary string if
// the generic lambda has is_transparent
m.find( string_view("hello world") );


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<div dir=3D"ltr">If I specify a generic lambda as a key comparison for an a=
ssociative container will it have an is_transparent typedef?<div><br></div>=
<div><div>auto comp =3D []( const auto&amp; x, const auto&amp; y )</div><di=
v>{</div><div><span class=3D"Apple-tab-span" style=3D"white-space:pre"> </s=
pan>return boost::iequals( x, y );</div><div>}</div><div><br></div><div>map=
&lt;string,int,decltype(comp)&gt; m(comp);</div><div><br></div><div>// If I=
 understand correctly this should not</div><div>// construct a temporary st=
ring if</div><div>// the generic lambda has is_transparent</div><div>m.find=
( string_view("hello world") );</div></div><div><br></div><div><br></div></=
div>

<p></p>

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[This belongs in std-discussion, not std-proposals]

On 14 November 2013 13:04, <mike.marcin@gmail.com> wrote:

> If I specify a generic lambda as a key comparison for an associative
> container will it have an is_transparent typedef?
>

No.

If you need something more than a lambda provides, write your own function
object.
--
 Nevin ":-)" Liber  <mailto:nevin@eviloverlord.com>  (847) 691-1404

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<div dir=3D"ltr">[This belongs in std-discussion, not std-proposals]<br><di=
v class=3D"gmail_extra"><br><div class=3D"gmail_quote">On 14 November 2013 =
13:04,  <span dir=3D"ltr">&lt;<a href=3D"mailto:mike.marcin@gmail.com" targ=
et=3D"_blank">mike.marcin@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr">If I specify a generic lamb=
da as a key comparison for an associative container will it have an is_tran=
sparent typedef?</div>

</blockquote><div><br></div><div>No.<br><br></div><div>If you need somethin=
g more than a lambda provides, write your own function object.<br></div></d=
iv>-- <br>=A0Nevin &quot;:-)&quot; Liber=A0 &lt;mailto:<a href=3D"mailto:ne=
vin@eviloverlord.com" target=3D"_blank">nevin@eviloverlord.com</a>&gt;=A0 (=
847) 691-1404
</div></div>

<p></p>

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