std::atomic_flag::operator=

来自cppreference.com
< cpp‎ | atomic‎ | 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,其赋值运算符被删除。