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std::atomic_init - cppreference.com

From cppreference.com

Defined in header <atomic>

template< class T > void atomic_init ( std::atomic<T>* obj, typename std::atomic<T>::value_type desired ) noexcept;

 (1) (since C++11)
(deprecated in C++20)

template< class T > void atomic_init ( volatile std::atomic<T>* obj, typename std::atomic<T>::value_type desired ) noexcept;

 (2) (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, or this function is called twice on the same obj, the behavior is undefined.

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

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 because
T was deduced from multiple arguments 		T is only deduced
from obj

See also