std::experimental::future Unwrapping Assignment Operator

Replaces the asynchronous state associated with *this with a new asynchronous state that unwraps the provided std::experimental::future object.

future& operator=(future<future<ResultType>>&& other);

Effects:

future& operator=(future<future<ResultType>>&& other){
  future temp(std::move(other));
  swap(temp);
  return *this;
}

#include <experimental/future>

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