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

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

Prüft, ob * this einen gemeinsamen Zustand besitzt.

Parameter

(keine)

Rückgabewert

true wenn * this einen gemeinsamen Zustand besitzt, false andernfalls.