C programming, make change at two location with one macro

Question

struct Error
{
   MACRO(1, Connect);
   MACRO(2, Timeout);
};    

I need to define MACRO() in such way that the above code will generate the following code.

struct Error
{  
   static const int Connect = 1;
   static const int Timeout = 2;
   const char * const name[] = {"Connect", "Timeout"};
};

Is this possible or what is the alternative to get what I'm trying to do?

Answer 1

You can't do this directly, but you can if you move the macros to a separate location (such as a separate file):

macros.hpp

MACRO(1, Connect)
MACRO(2, Timeout)

#undef MACRO

the other file

struct Error
{
  #define MACRO(a, b) static const int b = a;
  #include "macros.hpp"

  const char * const name [] = {
  #define MACRO(a, b) #b,
  #include "macros.hpp"
  }
};

Alternatively, you could achieve a similar effect with Boost.Preprocessor.