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std::atomic_ref<T>:: fetch_xor

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atomic_ref::fetch_xor
Constants
仅当 T 为除 cv bool 之外的整数类型时提供
value_type fetch_xor ( value_type arg,

std:: memory_order order =

std:: memory_order_seq_cst ) const noexcept ;
(C++20 起)

以原子方式将引用对象的当前值替换为原值与 arg 按位异或的结果。此操作属于读-改-写操作。内存访问顺序根据 order 参数的值确定。

此重载仅当 std:: is_const_v < T > 为 false 时参与重载决议。

参数

arg - 按位异或运算的另一个参数
order - 要强制执行的内存顺序约束

返回值

被引用对象的值，在此函数生效之前的值。

缺陷报告

下列行为变更缺陷报告被追溯应用于先前发布的C++标准。

缺陷报告 应用于 发布时的行为 正确行为
LWG 3508
( P3323R1 ) 		C++20 fetch_xor 对于 const T 无意义 约束为仅接受非 const 的 T