Defined in header <atomic> | ||
|---|---|---|
template< class T >
void atomic_init( std::atomic<T>* obj,
typename std::atomic<T>::value_type desired ) noexcept;
| (since C++11) | |
template< class T >
void atomic_init( volatile std::atomic<T>* obj,
typename std::atomic<T>::value_type desired ) noexcept;
| (since C++11) |
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.
| obj | - | pointer to an atomic object to initialize |
| desired | - | the value to initialize atomic object with |
(none).
This function is provided for compatibility with C. If the compatibility is not required, std::atomic may be initialized through their non-default constructors.
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 | T is deduced from the atomic argument only |
|
(C++11) | constant initialization of an atomic variable of static storage duration (function macro) |
| constructs an atomic object (public member function of std::atomic) |
|
C documentation for atomic_init |
|
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