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.