Question

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C, Macro defining Macro

Does anyone know how to pull off something like this…

I have a lot of repetitive macros as : –

#define MYMACRO1(x)         Do1(x)
#define MYMACRO2(x,y)       Do2(x, y)
#define MYNEXTMACRO1(x)     Do1(x)
#define MYNEXTMACRO2(x,y)   Do2(x, y)

The code above works fine, but I want to write a macro that creates macros (a meta macro).

For example: –

#define MYMETAMACRO(name) \
#define #name1(x)     Do1(x) \
#define #name2(x,y)   Do2(x, y) \

Such that I can do : –

MYMETAMACRO(MYMACRO);
MYMETAMACRO(MYNEXTMACRO);

and then : –

MYMACRO1(2);
MYMACRO2(2,3);
MYNEXTMACRO1(4);
MYNEXTMACRO2(4, 5);

The preprocessor bombs out at the #define as it thinks it is a missing parameter of the macro.

Answer 1

As far as I know, you can’t write a macros that writes another macros in C/C++.

I’ve spent enough time trying to do something like that using C preprocessor in C++ in the past, asked people around, and concluded that it isn’t possible.