cpp/coroutine/noop coroutine

Returns a coroutine handle referring to a no-op coroutine.

If there has been already a coroutine state of no-op coroutine, it is unspecified whether a subsequent call to returns a previously obtained coroutine handle, or a coroutine handle referring to a new coroutine state of no-op coroutine.

Parameters
(none)

Return value
A std referring to a no-op coroutine.