Difference between revisions of "cpp/coroutine/suspend always"
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{{member | {{small|std::suspend_always::}}await_suspend | 2= | {{member | {{small|std::suspend_always::}}await_suspend | 2= | ||
{{ddcl | since=c++20 | | {{ddcl | since=c++20 | | ||
| − | constexpr void await_suspend() const noexcept {} | + | constexpr void await_suspend(std::coroutine_handle<>) const noexcept {} |
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Revision as of 11:02, 18 July 2021
| Defined in header <coroutine>
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| 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.
Contents |
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
| This section is incomplete Reason: no example |
See also
| (C++20) |
indicates that an await-expression should never suspend (class) |
