33 Concurrency support library [thread]

33.3 Stop tokens [thread.stoptoken]

33.3.4 Class stop_source [stopsource] General [stopsource.general]

The class stop_source implements the semantics of making a stop request.
A stop request made on a stop_source object is visible to all associated stop_source and stop_token ([stoptoken]) objects.
Once a stop request has been made it cannot be withdrawn (a subsequent stop request has no effect).
namespace std { // no-shared-stop-state indicator struct nostopstate_t { explicit nostopstate_t() = default; }; inline constexpr nostopstate_t nostopstate{}; class stop_source { public: // [stopsource.cons], constructors, copy, and assignment stop_source(); explicit stop_source(nostopstate_t) noexcept; stop_source(const stop_source&) noexcept; stop_source(stop_source&&) noexcept; stop_source& operator=(const stop_source&) noexcept; stop_source& operator=(stop_source&&) noexcept; ~stop_source(); void swap(stop_source&) noexcept; // [stopsource.mem], stop handling [[nodiscard]] stop_token get_token() const noexcept; [[nodiscard]] bool stop_possible() const noexcept; [[nodiscard]] bool stop_requested() const noexcept; bool request_stop() noexcept; [[nodiscard]] friend bool operator==(const stop_source& lhs, const stop_source& rhs) noexcept; friend void swap(stop_source& lhs, stop_source& rhs) noexcept; }; }