33 Thread support library [thread]

33.6 Futures [futures]

33.6.10 Class template packaged_­task [futures.task]

33.6.10.2 packaged_­task globals [futures.task.nonmembers]

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template <class R, class... ArgTypes> void swap(packaged_task<R(ArgTypes...)>& x, packaged_task<R(ArgTypes...)>& y) noexcept;
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#
Effects: As if by x.swap(y).
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template <class R, class Alloc> struct uses_allocator<packaged_task<R>, Alloc> : true_type { };
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Requires: Alloc shall be an Allocator ([allocator.requirements]).