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1088.std::promise should provide non-member swap overload
Section: 32.10.6 [futures.promise] Status: Resolved Submitter: Howard Hinnant Opened: 2009-03-22 Last modified: 2016-01-28
Priority: Not Prioritized
View all other issues in [futures.promise].
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Discussion:
Addresses UK 342 [CD1]
std::promise is missing a non-member overload of swap. This is inconsistent with other types that provide a swap member function.
Add a non-member overload void swap(promise&& x,promise&& y){ x.swap(y); }
[ Summit: ]
Create an issue. Move to review, attention: Howard. Detlef will also look into it.
[ Post Summit Daniel provided wording. ]
[ 2009-10 Santa Cruz: ]
NAD Editorial Resolved. Addressed by N2997.
Proposed resolution:
In 32.10.6 [futures.promise], before p.1, immediately after class template promise add:
template <class R> void swap(promise<R>& x, promise<R>& y);
Change 32.10.6 [futures.promise]/10 as indicated (to fix a circular definition):
-10- Effects: swap(*this, other) Swaps the associated state of
*thisandotherThrows: Nothing.
After the last paragraph in 32.10.6 [futures.promise] add the following prototype description:
template <class R> void swap(promise<R>& x, promise<R>& y);Effects:
x.swap(y)Throws: Nothing.
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