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std::shared_future<T>:: ~shared_future

From cppreference.net
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Memory ordering
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Free functions for atomic operations
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Free functions for atomic flags
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std::shared_future
~shared_future ( ) ;
(depuis C++11)

Si * this est le dernier objet référençant l'état partagé, détruit l'état partagé. Sinon, ne fait rien.