Atomically replaces the current value with the result of arithmetic addition of the value and arg. That is, it performs atomic post-increment. The operation is a read-modify-write operation. Memory is affected according to the value of order.
1,2)For signed integral types, arithmetic is defined to use twoâs complement representation. There are no undefined results.
For floating-point types, the floating-point environment in effect may be different from the calling thread's floating-point environment. The operation need not conform to the corresponding std::numeric_limits traits but is encouraged to do so. If the result is not a representable value for its type, the result is unspecified but the operation otherwise has no undefined behavior.
(since C++20)3,4) The result may be an undefined address, but the operation otherwise has no undefined behavior.
If T is not a complete object type, the program is ill-formed.
It is deprecated if std::atomic<T>::is_always_lock_free is false and overload (2) or (4) participates in overload resolution.
(since C++20) [edit] Parameters arg - the other argument of arithmetic addition order - memory order constraints to enforce [edit] Return valueThe value immediately preceding the effects of this function in the modification order of *this.
[edit] ExamplePossible output:
Result : 15 Seen return value : 11 Seen return value : 10 Seen return value : 14 Seen return value : 12 Seen return value : 13[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 arithmetic permitted on pointers to (possibly cv-qualified) void or function made ill-formed [edit] See alsoRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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