A solution to the multiple inclusion problem

[Jonathan Shapiro]

Okay, here's another cute trick.

Have an include file called include-files.h, which contains things
like

   #define FRED_H "fred.h"
   #define WILMA_H "wilma.h"

include them by doing the following in all source files:

   #include "include-files.h"  // done once in all source files
  
   #include FRED_H
   #include ...

inside FRED_H do the following:

   #ifdef FRED_H
   #undef FRED_H
   #define FRED_H /dev/null
   #endif

This works, doesn't require much overhead, and can be automatically
done applied to existing code by a fairly simple shell script.

Jonathan S. Shapiro
Synergistic Computing Associates