[thread.stoptoken.syn]

namespace std { // [stoptoken], class stop_token class stop_token; // [stopsource], class stop_source class stop_source; // no-shared-stop-state indicator struct nostopstate_t { explicit nostopstate_t() = default; }; inline constexpr nostopstate_t nostopstate{}; // [stopcallback], class stop_callback template<class Callback> class stop_callback; }