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Are call wrappers move-enabled?
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Scott Meyers
Nov 17, 2009, 11:27:50 AM11/17/09
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[func.require]/4 (20.7.2/4 in N3000) says that call wrappers (such as are
returned from std::bind) must be copy constructible, but it says nothing about
such wrappers being movable. Does this mean that in
returned from std::bind) must be copy constructible, but it says nothing about
such wrappers being movable. Does this mean that in
auto f = std::bind( /* blah, blah, blah */ );
I should expect f to be copy constructed from the object returned by bind?
Thanks,
Scott
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Daniel Krügler
Nov 17, 2009, 2:29:11 PM11/17/09
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On 17 Nov., 17:27, Scott Meyers <use...@aristeia.com> wrote:
> [func.require]/4 (20.7.2/4 in N3000) says that call wrappers (such as are
> returned from std::bind) must be copy constructible, but it says nothing about
> such wrappers being movable. Does this mean that in
>
> auto f = std::bind( /* blah, blah, blah */ );
>
> I should expect f to be copy constructed from the object returned by bind?
> [func.require]/4 (20.7.2/4 in N3000) says that call wrappers (such as are
> returned from std::bind) must be copy constructible, but it says nothing about
> such wrappers being movable. Does this mean that in
>
> auto f = std::bind( /* blah, blah, blah */ );
>
> I should expect f to be copy constructed from the object returned by bind?
No, the result should be movable. Note that this LWG issue:
http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#817
HTH & Geetings from Bremen,
Daniel Kr�gler
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