静态常量与#define

问题描述

使用 static const 变量比使用 #define 预处理器更好吗?或者这取决于上下文?

Is it better to use static const vars than #define preprocessor? Or maybe it depends on the context?

每种方法的优点/缺点是什么?

What are advantages/disadvantages for each method?

推荐答案

就个人而言，我讨厌预处理器，所以我总是使用 const.

Personally, I loathe the preprocessor, so I'd always go with const.

#define 的主要优点是它不需要内存来存储您的程序，因为它实际上只是用文字值替换一些文本.它还有一个优点是它没有类型，所以它可以用于任何整数值而不会产生警告.

The main advantage to a #define is that it requires no memory to store in your program, as it is really just replacing some text with a literal value. It also has the advantage that it has no type, so it can be used for any integer value without generating warnings.

const"的优点是可以限定范围，可以在需要传递对象指针的情况下使用.

Advantages of "const"s are that they can be scoped, and they can be used in situations where a pointer to an object needs to be passed.

不过，我不知道您对static"部分的确切含义.如果您是全局声明，我会将它放在匿名命名空间中，而不是使用 static.例如

I don't know exactly what you are getting at with the "static" part though. If you are declaring globally, I'd put it in an anonymous namespace instead of using static. For example

namespace {
   unsigned const seconds_per_minute = 60;
};

int main (int argc; char *argv[]) {
...
}

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