在字符串文字内展开宏

2022-01-11 00:00:00 macros visual-c++ c++ c++11

我要做的是#define一个宏:

#define a(2)

然后在字符串文字中使用它:string = "a";.

and later use it inside a string literal: string = "a";.

我希望该字符串不被解释为字符串，而是获取 a 的值，即 2.我没有成功，有人可以帮忙吗?

I want that string to be interpreted not as string but to get the value of a, i.e. 2. I didn't succeed, can anybody help?

推荐答案

#define STRINGIFY2(X) #X #define STRINGIFY(X) STRINGIFY2(X) #define A 2

然后 STRINGIFY(A) 会给你 "2".您可以通过将它们并排放置来将其与其他字符串文字连接起来.

Then STRINGIFY(A) will give you "2". You can concatenate it with other string literals by putting them side by side.

我有数字STRINGIFY(A)"." 给你我有数字 2.".

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