如何在 C 或 C++ 中打印宏名称

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

如何在 c 或 c++ 中打印宏名称例如:

How to print macro name in c or c++ eg:

#define APINAME abc
#define PRINTAPI(x) printf("x")

我想打印 PRINTAPI(APINAME) 而不是abc"

I want to print PRINTAPI(APINAME) and not "abc"

推荐答案

宏是预处理器，在编译代码之前，它们将被相关的语句替换.因此，您没有机会在运行时拥有宏名称.但是，您可以在编译时生成字符串名称:

Macros are pre-processors and they will be replaced by their associated statement before compiling the code. So, you have no chance to have the macro names in run-time. But, you can generate the string name in compile-time:

#define APINAME abc
#define PRINTAPI(x) std::cout << #x << std::endl;

int main()
{
    PRINTAPI(APINAME);
}

输出

APINAME

在宏中，运算符 # 将输入参数变为字符串文字(stringify)

In macros the operator # makes the input parameter to a string literal (stringify)

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