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

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

Проверяет, имеет ли * this общее состояние.

Параметры

(нет)

Возвращаемое значение

true если * this имеет общее состояние, false в противном случае.