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^=