T operator++(int) volatile noexcept;
T operator++(int) noexcept;
Effects: Equivalent to: return fetchadd(1);
T operator--(int) volatile noexcept;
T operator--(int) noexcept;
Effects: Equivalent to: return fetchsub(1);
T operator++() volatile noexcept;
T operator++() noexcept;
T operator--() volatile noexcept;
T operator--() noexcept;