std::once_flag - cppreference.com (original) (raw)
| | | | | ----------------- | | ------------- | | class once_flag; | | (since C++11) |
The class std::once_flag is a helper structure for std::call_once.
An object of type std::once_flag that is passed to multiple calls to std::call_once allows those calls to coordinate with each other such that only one of the calls will actually run to completion.
std::once_flag is neither copyable nor movable.
Contents
[edit] Member functions
std::once_flag::once_flag
| constexpr once_flag() noexcept; | | | | -------------------------------- | | |
Constructs an once_flag object. The internal state is set to indicate that no function has been called yet.
Parameters
(none)