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std::shared_future<T>::get

From cppreference.com
 
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std::shared_future
 
Main template
const T& get() const;
 (1) (since C++11)
std::shared_future<T&> specializations
T& get() const;
 (2) (since C++11)
std::shared_future<void> specialization
void get() const;
 (3) (since C++11)

The get member function waits (by calling wait()) until the shared state is ready, then retrieves the value stored in the shared state (if any).

If valid() is false before the call to this function, the behavior is undefined.

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