tmp/tmptqz7mnv3/{from.md → to.md}
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#### General <a id="stopsource.general">[[stopsource.general]]</a>
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The class `stop_source` implements the semantics of making a stop
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request. A stop request made on a `stop_source` object is visible to all
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associated `stop_source` and `stop_token` [[stoptoken]] objects. Once a
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stop request has been made it cannot be withdrawn (a subsequent stop
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request has no effect).
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``` cpp
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namespace std {
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// no-shared-stop-state indicator
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struct nostopstate_t {
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explicit nostopstate_t() = default;
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};
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inline constexpr nostopstate_t nostopstate{};
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class stop_source {
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public:
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// [stopsource.cons], constructors, copy, and assignment
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stop_source();
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explicit stop_source(nostopstate_t) noexcept
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stop_source(stop_source&&) noexcept;
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stop_source& operator=(const stop_source&) noexcept;
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stop_source& operator=(stop_source&&) noexcept;
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~stop_source();
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void swap(stop_source&) noexcept;
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[[nodiscard]] bool stop_requested() const noexcept;
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bool request_stop() noexcept;
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};
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}
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```
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#### General <a id="stopsource.general">[[stopsource.general]]</a>
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``` cpp
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namespace std {
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class stop_source {
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public:
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// [stopsource.cons], constructors, copy, and assignment
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stop_source();
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explicit stop_source(nostopstate_t) noexcept {}
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// [stopsource.mem], member functions
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void swap(stop_source&) noexcept;
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stop_token get_token() const noexcept;
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bool stop_possible() const noexcept;
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bool stop_requested() const noexcept;
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bool request_stop() noexcept;
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bool operator==(const stop_source& rhs) noexcept = default;
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private:
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shared_ptr<unspecified> stop-state; // exposition only
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};
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}
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```
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*`stop-state`* refers to the `stop_source`’s associated stop state. A
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`stop_source` object is disengaged when *`stop-state`* is empty.
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`stop_source` models `stoppable-source`, `copyable`,
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`equality_comparable`, and `swappable`.
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