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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