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From: =?ISO-8859-1?Q?Daniel_Kr=FCgler?= <daniel.kruegler@gmail.com>
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Subject: Re: Re: std::sink<T> to efficiently pass `sink` arguments
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2013/9/11 Vittorio Romeo <vittorio.romeo.vee@gmail.com>

> Sorry for the duplicate thread. As Jonathan Wakely suggested, let's just
> use this one to avoid unnecessary duplication.
>
> In the other thread, *Jared Grubb* mentioned:
>
>> At GoingNative last week, someone mentioned that "move elision" will
>> (probably?) be added to the standard. That means the compiler is allowed to
>> remove moves in the same way compilers are allowed to remove copies.
>> I think that would apply to your example, and so the results would just
>> be "1 move" and "1 copy", respectively. But, ask a guru, since I'm not 100%
>> certain.
>
>
> *Jonathan Wakely* replied to him:
>
>> That's already allowed in C++11.
>>
>
>  This sounds a good solution. However, searching online for "move elision"
> returns 0 relevant results.
> Can someone confirm this?
>

The standard does not have a separate name for it, so there exists not the
term "move elision".  The definition of copy elision starts as follows:

"This elision of copy/move operations, called copy elision, is permitted in
the following circumstances [..]"

- Daniel

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">2013=
/9/11 Vittorio Romeo <span dir=3D"ltr">&lt;<a href=3D"mailto:vittorio.romeo=
..vee@gmail.com" target=3D"_blank">vittorio.romeo.vee@gmail.com</a>&gt;</spa=
n><br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir=3D"ltr">Sorry for the duplicate thread. As=A0<span style=3D"white-=
space:nowrap"><span>Jonathan Wakely</span></span><span style=3D"white-space=
:nowrap">=A0suggested, let&#39;s just use this one to avoid unnecessary dup=
lication.<br>
<br>In the other thread, <b>Jared Grubb</b>=A0mentioned:</span><div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
x solid rgb(204,204,204);padding-left:1ex">At GoingNative last week, someon=
e mentioned that &quot;move elision&quot; will (probably?) be added to the =
standard. That means the compiler is allowed to remove moves in the same wa=
y compilers are allowed to remove copies.=A0<br>
I think that would apply to your example, and so the results would just be =
&quot;1 move&quot; and &quot;1 copy&quot;, respectively. But, ask a guru, s=
ince I&#39;m not 100% certain.</blockquote><div><br></div><div><b>Jonathan =
Wakely</b>=A0replied to him:</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">That&#39;s already allowe=
d in C++11.<br></blockquote><div><br></div><div>=A0This sounds a good solut=
ion. However, searching online for &quot;move elision&quot; returns 0 relev=
ant results.</div>
<div>Can someone confirm this?</div></div></div></blockquote><div><br></div=
><div>The standard does not have a separate name for it, so there exists no=
t the term &quot;move elision&quot;.=A0 The definition of copy elision star=
ts as follows:<br>
<br>&quot;This elision of copy/move operations, called copy elision, is per=
mitted in the following circumstances [..]&quot;<br><br></div><div>- Daniel=
 <br></div></div></div></div>

<p></p>

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