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std:: nostopstate, std:: nostopstate_t

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std::stop_source
定义于头文件 <stop_token>
struct nostopstate_t { explicit nostopstate_t ( ) = default ; } ;
(1) (C++20 起)
inline constexpr std:: nostopstate_t nostopstate { } ;
(2) (C++20 起)
1) 用于在 std::stop_source 非默认构造函数中作为占位符的空标签类型，该构造函数会使构造的 std::stop_source 成为空对象且不关联任何停止状态。
2) 用于构造空 std::stop_source 的 std::nostopstate_t 对应常量对象实例，在非默认构造函数中作为占位符值使用。

参见

(C++20)
表示停止一个或多个 std::jthread 请求的类
(类)