Exchange ownership of the asynchronous results associated with two std::experimental::promise
objects.
void swap(promise& other);
Exchange ownership of the asynchronous results associated with
other and *this.
The asynchronous result associated with other
prior to the invocation of swap
(if any) is associated with *this. The asynchronous result associated
with *this
prior to the invocation of swap
(if any) is associated with other
Nothing.
#include <experimental/future>