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std::future<T>::~future - cppreference.com

From cppreference.com

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.
 (since C++14)