std::coroutine_handle<Promise>::operator(), std::coroutine_handle<Promise>::resume

Member of other specializations
void operator()() const;
void resume() const;
(1) (since C++20)
Member of specialization std::coroutine_handle<std::noop_coroutine_promise>
constexpr void operator()() const noexcept;
constexpr void resume() const noexcept;
(2) (since C++20)
1) Resumes the execution of the coroutine to which *this refers, or does nothing if the coroutine is a no-op coroutine.
2) Does nothing.

The behavior is undefined if *this does not refer to suspended coroutine, or the coroutine is not a no-op coroutine and suspended at its final suspend point. A concurrent resumption of the coroutine may result in a data race.

Resumption of a coroutine on an execution agent other than the one on which it was suspended has implementation-defined behavior unless each execution agent either is a thread represented by std::thread or std::jthread, or is the thread executing main.



Return value



If an exception is thrown from the execution of the coroutine, the exception is caught and unhandled_exception is called on the coroutine's promise object. If the call to unhandled_exception throws or rethrows an exception, that exception is propagated.


A coroutine that is resumed on a different execution agent should avoid relying on consistent thread identity throughout, such as holding a mutex object across a suspend point.


See also

destroys a coroutine
(public member function)

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