std::noop_coroutine_promise
Defined in header <coroutine> |
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struct noop_coroutine_promise {}; |
(since C++20) |
noop_coroutine_promise is the promise type of no-op coroutines.
A no-op coroutine behaves as if it.
- does nothing other than the control flow of a coroutine, and
- is suspended immediately after beginning and resumption, and
- has a coroutine state such that destroying the state is no-op, and
- never reaches its final suspended point if there is any
std::coroutine_handlereferring to it.
No-op coroutines can be started by std::noop_coroutine, and controlled by the coroutine handle it returns. The returned coroutine handle is of type std::noop_coroutine_handle, which is a synonym for std::coroutine_handle<std::noop_coroutine_promise>.
Some operations of a no-op coroutines are determined no-op at compile time through the type std::noop_coroutine_handle.
Example
See also
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(C++20)
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creates a coroutine handle that has no observable effects when resumed or destroyed (function) |
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(C++20)
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std::coroutine_handle<std::noop_coroutine_promise>, intended to refer to a no-op coroutine (typedef) |
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