std:: unstoppable_token

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Defined 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 ;

} ;
(since C++26)

The concept unstoppable_token<Token> specifies an additional requirement for a stoppable_token where the type does not allow stopping. That is, the expression tok. stop_possible ( ) must be usable in constant expression and returns false .

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