std::stop_token::stop_possible

 

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Technical Specifications

 

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thread (C++11)
jthread (C++20)
stop_token (C++20)
stop_source (C++20)
stop_callback (C++20)
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std::stop_token

Member functions

stop_token::stop_token

stop_token::~stop_token

stop_token::operator=

Modifiers

stop_token::swap

Observers

stop_token::stop_requested

stop_token::stop_possible

Non-member functions

swap(std::stop_token)

operator==

 

[[nodiscard]] bool stop_possible() const noexcept;		(since C++20)

Checks if the stop_token object has associated stop-state, and that state either has already had a stop requested or it has associated std::stop_source object(s).

A default constructed stop_token has no associated stop-state, and thus cannot be stopped; associated stop-state for which no std::stop_source object(s) exist can also not be stopped if such a request has not already been made.

Parameters

(none)

Return value

false if the stop_token object has no associated stop-state, or it did not yet receive a stop request and there are no associated std::stop_source object(s); true otherwise

Notes

If the stop_token object has associated stop-state and a stop request has already been made, this function still returns true.

If the stop_token object has associated stop-state from a std::jthread - for example the stop_token was retrieved by invoking get_stop_token() on a std::jthread object - then this function always returns true. A std::jthread always has an internal std::stop_source object even if the thread's invoking function does not check it.