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std:: unstoppable_token

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Definiert in Header <stop_token>
template < class Token >

concept unstoppable_token =
std :: stoppable_token < Token > &&
requires ( const Token tok ) {
requires std:: bool_constant < ( ! tok. stop_possible ( ) ) > :: value ;

} ;
(seit C++26)

Das Konzept unstoppable_token<Token> spezifiziert eine zusätzliche Anforderung für einen stoppable_token , bei dem der Typ das Stoppen nicht erlaubt. Das bedeutet, dass der Ausdruck tok. stop_possible ( ) in konstanten Ausdrücken verwendbar sein muss und false zurückgibt.