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std::atomic_ref<T>:: is_always_lock_free

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Constants
atomic_ref::is_always_lock_free
static constexpr bool is_always_lock_free = /*implementation-defined*/ ;
(自 C++20 起)

若此 atomic_ref 类型的操作始终为无锁操作，则等于 true ；若从未或无锁操作仅有时成立，则等于 false 。

该常量的值与成员函数 is_lock_free 的结果保持一致。

参见

检查 atomic_ref 对象是否无锁
(公开成员函数)