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std::jthread::joinable

From cppreference.com
< cpp‎ | thread‎ | jthread

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std::jthread
 
bool joinable() const noexcept;
 (since C++20)

Checks if the std::jthread object identifies an active thread of execution. Specifically, returns true if get_id() != std::jthread::id(). So a default constructed jthread is not joinable.

A thread that has finished executing code, but has not yet been joined is still considered an active thread of execution and is therefore joinable.

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