table of contents
std::once_flag(3) | C++ Standard Libary | std::once_flag(3) |
NAME¶
std::once_flag - std::once_flag
Synopsis¶
Defined in header <mutex>
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.
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)
See also¶
call_once invokes a function only once even if called from
multiple threads
(C++11) (function template)
C documentation for
once_flag
2024.06.10 | http://cppreference.com |