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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../atomic/atomic_init.html below:

std::atomic_init - cppreference.com

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.

[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 [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 because
T was deduced from multiple arguments T is only deduced
from obj [edit] See also

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