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std:: unstoppable_token

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定義済みヘッダー <stop_token>
template < class Token >

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

} ;
(C++26以降)

unstoppable_token<Token> コンセプトは、 stoppable_token に対する追加要件を指定するもので、停止を許可しない型を対象とします。すなわち、式 tok. stop_possible ( ) は定数式で使用可能であり、 false を返さなければなりません。