std::atomic_ref<T>::operator+=,-=

Atomically replaces the current value referenced by *ptr with the result of computation involving the previous value and arg. These operations are read-modify-write operations.

# Declarations

Provided only when T is an arithmetic type other than cv bool or a pointer-to-object type

value_type operator+=( difference_type arg ) const noexcept;

(constexpr since C++26)

value_type operator-=( difference_type arg ) const noexcept;

(constexpr since C++26)

# Parameters

• arg: the argument for the arithmetic operation

# Return value

The resulting value (that is, the result of applying the corresponding binary operator to the value referenced by *ptr immediately preceding the effects of the corresponding member function).

# Notes

Unlike most compound assignment operators, the compound assignment operators for atomic_ref return a copy of the stored value instead of a reference to arg.

# Example

This section is incompleteReason: no example

# Defect reports

# See also

• fetch_add
• fetch_sub
• operator++operator++(int)operator–operator–(int)
• operator&=operator|=operator^=