std::promise::swap

From cppreference.com
void swap( promise& other );
(since C++11)

Exchanges the shared states of two promise objects.

Contents

[edit] Parameters

other - the promise to swap with

[edit] Return value

(none)

[edit] Exceptions

noexcept specification:  
noexcept
  (since C++11)

[edit] Example

[edit] See also

specializes the std::swap algorithm
(function template)