C++:常量引用,在类型说明符之前 vs 之后

C++: const reference, before vs after type-specifier(C++:常量引用,在类型说明符之前 vs 之后)
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问题描述

中的参数有什么区别:

int foo1(const Fred &arg) {
...
}

int foo2(Fred const &arg) {
...
}

?我在 parashift 常见问题解答中没有看到这种情况.

? I don't see this case covered in the parashift FAQ.

推荐答案

没有区别,因为 const 相对于 & 是从右到左读取的,因此两者都表示对不可变 Fred 实例的引用.

No difference as const is read right-to-left with respect to the &, so both represent a reference to an immutable Fred instance.

弗雷德&const 意味着引用本身是不可变的,即 冗余;在处理 const 指针 时 Fred const*Fred* const 有效但不同.

Fred& const would mean the reference itself is immutable, which is redundant; when dealing with const pointers both Fred const* and Fred* const are valid but different.

这是风格问题,但我更喜欢使用 const 作为后缀,因为它可以一致地应用,包括 const 成员函数.

It's a matter of style, but I prefer using const as a suffix since it can be applied consistently including const member functions.

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