ATOMIC_FLAG_INIT

Defines the initializer which can be used to initialize std::atomic_flag to clear (false) state in the form std:: atomic_flag v = ATOMIC_FLAG_INIT ; . It is unspecified if it can be used with other initialization contexts.

If the flag has is a complete object with static storage duration , this initialization is static .

Example

#include <atomic>
 
std::atomic_flag static_flag = ATOMIC_FLAG_INIT; // static initialization,
// guaranteed to be available during dynamic initialization of static objects.
 
int main()
{
    std::atomic_flag automatic_flag = ATOMIC_FLAG_INIT; // guaranteed to work
//    std::atomic_flag another_flag(ATOMIC_FLAG_INIT); // unspecified
}

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

See also