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c++cmacrosc-preprocessorpreprocessor-directive

Escaping a # symbol in a #define macro?

Without going into the gory details I want to use a #define macro that will expand to a #include but the '#' sign is confusing the preprocessor (as it thinks I want to quote an argument.)

For example, I want to do something like this:

#define MACRO(name) #include "name##foo"

And use it thus:

MACRO(Test)

Which will expand to:

#include "Testfoo"

The humble # sign is causing the preprocessor to barf. MinGW gives me the following error:

'#' is not followed by a macro parameter

I guess I need to escape the # sign but I don't if this is even possible.

Yes, macros are indeed evil...

Solution

  • As far as I remember you cannot use another preprocessor directive in define.