NAME¶

std::noop_coroutine_promise - std::noop_coroutine_promise

Synopsis¶

Defined in header <coroutine>
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_handle
referring to it.

This section is incomplete
Reason: more precise wording

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.

This section is incomplete
Reason: usage of no-op coroutines

Example¶

This section is incomplete
Reason: no example

See also¶

noop_coroutine creates a coroutine handle that has no observable effects when
(C++20) resumed or destroyed
(function)
noop_coroutine_handle std::coroutine_handle<std::noop_coroutine_promise>, intended
(C++20) to refer to a no-op coroutine
(typedef)