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std::suspend_always

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

suspend_always is an empty class which can be used to indicate that an await expression always suspends and does not produce a value.

Member functions

await_ready
(C++20)
indicates that an await expression always suspends
(public member function)
await_suspend
(C++20)
no-op
(public member function)
await_resume
(C++20)
no-op
(public member function)

std::suspend_always::await_ready

constexpr bool await_ready() const noexcept { return false; }
 (since C++20)

Always returns false, indicating that an await expression always suspends.

std::suspend_always::await_suspend

constexpr void await_suspend( std::coroutine_handle<> ) const noexcept {}
 (since C++20)

Does nothing.

std::suspend_always::await_resume

constexpr void await_resume() const noexcept {}
 (since C++20)

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

Example

See also

(C++20)
indicates that an await-expression should never suspend
(class)

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https://en.cppreference.com/w/cpp/coroutine/suspend_always