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std::atomic_flag:: operator=

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std::atomic_flag
定义于头文件 <atomic>
atomic_flag & operator = ( const atomic_flag & ) = delete ;
(1) (C++11 起)
atomic_flag & operator = ( const atomic_flag & ) volatile = delete ;
(2) (C++11 起)

std::atomic_flag 不可赋值，其赋值运算符已被删除。