std::suspend_never

 

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Coroutine support

Coroutine traits

coroutine_traits (C++20)

Coroutine handle

coroutine_handle (C++20)

No-op coroutines

noop_coroutine_promise (C++20)

noop_coroutine (C++20)

Trivial awaitables

suspend_never (C++20)

suspend_always (C++20)

Range generators

generator (C++23)

 

Defined in header <coroutine>
struct suspend_never;		(since C++20)

suspend_never is an empty class which can be used to indicate that an await expression never suspends and does not produce a value.

Member functions

await_ready	indicates that an await expression never suspends (public member function)
await_suspend	no-op (public member function)
await_resume	no-op (public member function)

std::suspend_never::await_ready

constexpr bool await_ready() const noexcept { return true; }

Always returns true, indicating that an await expression never suspends.

std::suspend_never::await_suspend

constexpr void await_suspend( std::coroutine_handle<> ) const noexcept {}

Does nothing.

std::suspend_never::await_resume

constexpr void await_resume() const noexcept {}

Does nothing. An await expression does not produce a value if suspend_never is used.

Example

See also

suspend_always (C++20)

indicates that an await-expression should always suspend (class)

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