std::future<T>::~future
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std::future 
 
 Member functions
future::~future
 Getting the result
 State
~future();
 
 (since C++11) 
Releases any shared state. This means:
- If the current object holds the last reference to its shared state, the shared state is destroyed.
- The current object gives up its reference to its shared state.
-  These actions will not block for the shared state to become ready, except that they may block if all following conditions are satisfied:
- The shared state was created by a call to std::async .
- The shared state is not yet ready.
- The current object was the last reference to the shared state.