std::atomic_ref<T>::operator++,++(int),--,--(int) (3) - Linux Manuals

std::atomic_ref<T>::operator++,++(int),--,--(int): std::atomic_ref<T>::operator++,++(int),--,--(int)


std::atomic_ref<T>::operator++,++(int),--,--(int) - std::atomic_ref<T>::operator++,++(int),--,--(int)


member only of atomic_ref<Integral> and atomic_ref<T*> template specializations
value_type operator++() const noexcept; (1) (since C++20)
value_type operator++(int) const noexcept; (2) (since C++20)
value_type operator--() const noexcept; (3) (since C++20)
value_type operator--(int) const noexcept; (4) (since C++20)

Atomically increments or decrements the current value of the referenced object. These operations are read-modify-write operations.
1) Performs atomic pre-increment. Equivalent to return fetch_add(1) + 1;.
2) Performs atomic post-increment. Equivalent to return fetch_add(1);.
3) Performs atomic pre-decrement. Equivalent to return fetch_sub(1) - 1;
4) Performs atomic post-decrement. Equivalent to return fetch_sub(1);.
For signed Integral types, arithmetic is defined to use two’s complement representation. There are no undefined results.
For T* types, the result may be an undefined address, but the operations otherwise have no undefined behavior. The program is ill-formed if T is not an object type.



Return value

1,3) The value of the referenced object after the modification.
2,4) The value of the referenced object before the modification.


Unlike most pre-increment and pre-decrement operators, the pre-increment and pre-decrement operators for atomic_ref do not return a reference to the modified object. They return a copy of the stored value instead.

See also

           atomically adds the argument to the value stored in the referenced object and obtains the value held previously
fetch_add (public member function)
           atomically subtracts the argument from the value stored in the referenced object and obtains the value held previously
fetch_sub (public member function)

operator-= atomically adds, subtracts, or performs bitwise AND, OR, XOR with the referenced value
operator&= (public member function)