tmp/tmp6cgrzq9r/{from.md → to.md}
RENAMED
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| 1 |
+
### Class template `stop_callback` <a id="stopcallback">[[stopcallback]]</a>
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| 3 |
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``` cpp
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namespace std {
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template<class Callback>
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class stop_callback {
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public:
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using callback_type = Callback;
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// [stopcallback.cons], constructors and destructor
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template<class C>
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explicit stop_callback(const stop_token& st, C&& cb)
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noexcept(is_nothrow_constructible_v<Callback, C>);
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template<class C>
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explicit stop_callback(stop_token&& st, C&& cb)
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noexcept(is_nothrow_constructible_v<Callback, C>);
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~stop_callback();
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stop_callback(const stop_callback&) = delete;
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stop_callback(stop_callback&&) = delete;
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stop_callback& operator=(const stop_callback&) = delete;
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stop_callback& operator=(stop_callback&&) = delete;
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private:
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Callback callback; // exposition only
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};
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template<class Callback>
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stop_callback(stop_token, Callback) -> stop_callback<Callback>;
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}
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```
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*Mandates:* `stop_callback` is instantiated with an argument for the
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template parameter `Callback` that satisfies both `invocable` and
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`destructible`.
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*Preconditions:* `stop_callback` is instantiated with an argument for
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the template parameter `Callback` that models both `invocable` and
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`destructible`.
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| 40 |
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#### Constructors and destructor <a id="stopcallback.cons">[[stopcallback.cons]]</a>
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``` cpp
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template<class C>
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explicit stop_callback(const stop_token& st, C&& cb)
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noexcept(is_nothrow_constructible_v<Callback, C>);
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template<class C>
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explicit stop_callback(stop_token&& st, C&& cb)
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noexcept(is_nothrow_constructible_v<Callback, C>);
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```
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*Constraints:* `Callback` and `C` satisfy
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`constructible_from<Callback, C>`.
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*Preconditions:* `Callback` and `C` model
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`constructible_from<Callback, C>`.
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*Effects:* Initializes `callback` with `std::forward<C>(cb)`. If
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`st.stop_requested()` is `true`, then
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`std::forward<Callback>(callback)()` is evaluated in the current thread
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before the constructor returns. Otherwise, if `st` has ownership of a
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stop state, acquires shared ownership of that stop state and registers
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| 63 |
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the callback with that stop state such that
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| 64 |
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`std::forward<Callback>(callback)()` is evaluated by the first call to
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`request_stop()` on an associated `stop_source`.
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| 66 |
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*Remarks:* If evaluating `std::forward<Callback>(callback)()` exits via
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| 68 |
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an exception, then `terminate` is called [[except.terminate]].
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*Throws:* Any exception thrown by the initialization of `callback`.
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``` cpp
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~stop_callback();
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```
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*Effects:* Unregisters the callback from the owned stop state, if any.
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The destructor does not block waiting for the execution of another
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callback registered by an associated `stop_callback`. If `callback` is
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concurrently executing on another thread, then the return from the
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| 80 |
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invocation of `callback` strongly happens before [[intro.races]]
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`callback` is destroyed. If `callback` is executing on the current
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thread, then the destructor does not block [[defns.block]] waiting for
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the return from the invocation of `callback`. Releases ownership of the
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stop state, if any.
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