std::swap(std::promise)
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                    |   Defined in header  <future>
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|   template< class R > void swap( promise<R> &lhs, promise<R> &rhs ) noexcept;  | 
(since C++11) | |
Specializes the std::swap algorithm for std::promise. Exchanges the shared state of lhs with that of rhs. Effectively calls lhs.swap(rhs).
Parameters
| lhs, rhs | - | promises whose states to swap | 
Return value
(none)
Example
| This section is incomplete Reason: no example  | 
See also
|    swaps two promise objects  (public member function)  |