在宏中生成包含文件名 [英] Generate include file name in a macro

问题描述

我想在宏中生成包含文件名。这在C ++中是合法的：

I'm trying to generate include file name in macro. This is supposed to be legal in C++:

#define INCLUDE_FILE "module_impl_win.hpp"
#include INCLUDE_FILE

这很好，但是一旦我尝试生成文件名，它就无法编译

this works fine, but as soon as I try to generated file name it failes to compile

#define INCLUDE_FILE(M) M##"_impl_win.hpp"
#include INCLUDE_FILE("module")

其实它在MSVC2010上给予警告

Actually it gives me warning on MSVC2010

警告C4067：预处理器伪指令后出现意外令牌 - 预期为newlin

warning C4067: unexpected tokens following preprocessor directive - expected a newlin

，但不包括该文件。

有什么问题？如何摆脱它？

What is the problem? How can I get rid of it?

推荐答案

我会使用帮助引用宏。这样的东西会给你你想要的：

I'd do this using a helper quoting macro. Something like this will give you what you want:

#define QUOTEME(M)       #M
#define INCLUDE_FILE(M)  QUOTEME(M##_impl_win.hpp)

#include INCLUDE_FILE(module)

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