std::atomic::operators
：原子：：运算符+=，-=，&=，=，^=
| | (1) | (since C++11) (member only of atomic |
|---|---|---|
| T operator+=( T arg | | |
| T operator+=( T arg ) volatile; | | |
| | (1) | (since C++11) (member only of atomic<T*> template specialization) |
| T* operator+=( std::ptrdiff_t arg | | |
| T* operator+=( std::ptrdiff_t arg ) volatile; | | |
| | (2) | (since C++11) (member only of atomic<Integral> template specialization) |
| T operator-=( T arg | | |
| T operator-=( T arg ) volatile; | | |
| | (2) | (since C++11) (member only of atomic<T*> template specialization) |
| T* operator-=( std::ptrdiff_t arg | | |
| T* operator-=( std::ptrdiff_t arg ) volatile; | | |
| | (3) | (since C++11) (member only of atomic<Integral> template specialization) |
| T operator&=( T arg | | |
| T operator&=( T arg ) volatile; | | |
| | (4) | (since C++11) (member only of atomic<Integral> template specialization) |
| T operator|=( T arg | | |
| T operator|=( T arg ) volatile; | | |
| | (5) | (since C++11) (member only of atomic<Integral> template specialization) |
| T operator^=( T arg | | |
| T operator^=( T arg ) volatile; | |
原子化地用涉及到前一个值的计算结果替换当前值arg.操作是读-修改-写操作.
1%29执行原子加法。相当于fetch_add(arg)+Arg.
2%29执行原子减法。相当于fetch_sub(arg)-Arg
3%29按位执行原子运算。相当于fetch_and(arg)&Arg.
4%29按位执行原子运算。相当于fetch_or(arg)阿格。
5%29执行原子位排他性或。相当于fetch_xor(arg)^Arg
签名Integral类型，算法定义为使用两种补码表示形式。没有未定义的结果。为T*类型，结果可能是一个未定义的地址，但否则操作就没有未定义的行为。
参数
| arg | - | the argument for the arithmetic operation |
|---|
返回值
结果值%28，即将相应的二进制运算符应用于紧接在修改顺序成*this29%。
例外
noexcept规格：
noexcept
注记
与大多数复合赋值运算符不同，原子类型的复合赋值运算符不返回对其左侧参数的引用。它们返回存储值的副本。
另见
| operator++operator++(int)operator--operator--(int) | increments or decrements the atomic value by one (public member function) |
|---|
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