Difference between revisions of "cpp/atomic/atomic init"
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Revision as of 09:39, 12 March 2022
| Defined in header <atomic>
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| template< class T > void atomic_init( std::atomic<T>* obj, |
(since C++11) (deprecated in C++20) |
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| template< class T > void atomic_init( volatile std::atomic<T>* obj, |
(since C++11) (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, the behavior is undefined.
If this function is called twice on the same obj, the behavior is undefined.
Contents |
Parameters
| obj | - | pointer to an atomic object to initialize |
| desired | - | the value to initialize atomic object with |
Return value
(none)
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.
Example
| This section is incomplete Reason: no example |
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 required because T is deduced from multiple arguments
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T is deduced from the atomic argument only
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See also
| (C++11)(deprecated in C++20) |
constant initialization of an atomic variable of static storage duration (function macro) |
| constructs an atomic object (public member function of std::atomic<T>)
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| C documentation for atomic_init
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