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问题描述
我有一个带有原子成员的类，我想写一个复制构造函数:
I have a class with an atomic member and i want to write a copy constructor:
struct Foo
{
std::atomic<int> mInt;
Foo() {}
Foo(const Foo& pOther)
{
std::atomic_store(mInt, std::atomic_load(pOther.mInt, memory_order_relaxed), memory_order_relaxed);
}
};
但是我不知道我必须使用哪种顺序，因为我不知道在何时何地调用此副本构造函数.
But i don't know which ordering i must use, because i don't know where and when this copy constructor will be called.
我可以对复制构造函数和赋值运算符使用relaxed排序吗?
Can i use relaxed ordering for copy constructor and assignment operator?
推荐答案
否，如果您不知道如何使用它，则应该使用memory_order_seq_cst以确保安全.如果使用memory_order_relaxed，则可能会遇到指令重新排序的问题.
No, if you don't know how it will be used, you should use memory_order_seq_cst to be safe. If you use memory_order_relaxed, you could run into issues with instructions being reordered.
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