std::stoppable_token

 

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定義於標頭檔案 <stop_token>
template< class Token > concept stoppable_token =     requires (const Token tok) {         typename /*check-type-alias-exists*/<Token::template callback_type>;         { tok.stop_requested() } noexcept -> std::same_as<bool>;         { tok.stop_possible() } noexcept -> std::same_as<bool>;         { Token(tok) } noexcept; // see implicit expression variations     } &&     std::copyable<Token> &&     std::equality_comparable<Token>;		(C++26 起)
幫助模板
template< template<class> class > struct /*check-type-alias-exists*/; // not defined		(僅作說明*)

概念 stoppable_token<Token> 指定了一個停止令牌的基本介面，該令牌是 可複製的 和 可相等比較的，並允許輪詢以檢視停止請求是否可能以及請求是否已發出。

參閱

unstoppable_token (C++26)

指定不允許停止的停止令牌 (concept)