std::atomic_ref::operator++,++(int),--,--(int)(3)

NAME
std::atomic_ref::operator++,++(int),--,--(int) - std::atomic_ref::operator++,++(int),--,--(int)

Synopsis
   member of atomic_ref<Integral> specializations
   and atomic_ref<T*> partial specialization
   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.

Notes
   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
   fetch_add and obtains the value held previously
              (public member function)
              atomically subtracts the argument from the value stored in the referenced
   fetch_sub object and obtains the value held previously
              (public member function)
   operator+= atomically adds to or subtracts from the referenced value
   operator-= (public member function)
   operator&= atomically performs bitwise AND, OR, XOR with the referenced value
   operator|= (public member function)
   operator^=