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std::atomic_flag:: atomic_flag

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Free functions for atomic flags
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std::atomic_flag
定义于头文件 <atomic>
(1)
atomic_flag ( ) noexcept = default ;
(C++11 起)
(C++20 前)
constexpr atomic_flag ( ) noexcept ;
(C++20 起)
atomic_flag ( const atomic_flag & ) = delete ;
(2) (C++11 起)

构造一个新的 std::atomic_flag 。

1) 平凡的默认构造函数，将 std::atomic_flag 初始化为未指定状态。
(C++20 前)
1) 将 std::atomic_flag 初始化为清除状态。
(C++20 起)
2) 复制构造函数被删除； std::atomic_flag 不可复制。

此外， std::atomic_flag 可通过 ATOMIC_FLAG_INIT 表达式进行值初始化以清除状态。对于具有静态 存储期 的 atomic_flag ，这保证了 静态初始化 ：该标志可在静态对象的构造函数中使用。

参见

(C++11)
将 std::atomic_flag 初始化为 false
(宏常量)