std::atomic_init
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constant initialization of an atomic variable of static storage duration
(function macro) [edit]
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atomic_init
(C++11)(deprecated in C++20)
(C++11)(deprecated in C++20)
(C++11)
(C++11)
(C++11)(deprecated in C++26)
(C++11)
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(C++20)
(C++20)
Defined in header
<atomic>
template< class T >
(1)
(since C++11) void atomic_init
( std::atomic <T>* obj,
(deprecated in C++20)
template< class T >
(2)
(since C++11) void atomic_init
( volatile std::atomic <T>* obj,
(deprecated in C++20)
Initializes the default-constructed atomic object obj with the value desired. The function is not atomic: concurrent access from another thread, even through an atomic operation, is a data race.
If obj was not default-constructed, or this function is called twice on the same obj, the behavior is undefined.
[edit] Parameters
obj
-
pointer to an atomic object to initialize
desired
-
the value to initialize atomic object with
[edit] Return value
(none)
[edit] Notes
This function is provided for compatibility with C. If the compatibility is not required, std::atomic may be initialized through their non-default constructors.
[edit] Example
This section is incomplete
Reason: no example
Reason: no example
[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| P0558R1 | C++11 | exact type match was required becauseT was deduced from multiple arguments
|
T is only deducedfrom obj |
[edit] See also
(C++11)(deprecated in C++20)
(function macro) [edit]
C documentation for atomic_init