std::stoppable_token

 

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定义于头文件 <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>;		（自 C++26 起）
辅助模板
template< template<class> class > struct /*check-type-alias-exists*/; // not defined		（仅作演示*）

概念 stoppable_token<Token> 指定了停止令牌的基本接口，该令牌是可复制 (copyable) 和可相等比较 (equality_comparable) 的，并允许轮询以查看停止请求是否可能以及是否已发出请求。

参见

unstoppable_token (C++26)

指定一个不允许停止的停止令牌 (概念)