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std:: unstoppable_token

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Definido en el encabezado <stop_token>
template < class Token >

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

} ;
(desde C++26)

El concepto unstoppable_token<Token> especifica un requisito adicional para un stoppable_token donde el tipo no permite el paro. Es decir, la expresión tok. stop_possible ( ) debe ser utilizable en una expresión constante y retorna false .