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std::packaged_task<R(Args...)>:: valid

From cppreference.net
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std::packaged_task
bool valid ( ) const noexcept ;
(depuis C++11)

Vérifie si * this possède un état partagé.

Paramètres

(aucun)

Valeur de retour

true si * this possède un état partagé, false sinon.