By using MACRO definitions, you can easily write lines of code that are only included in Debug versions and not in Release versions. For instance, if you create a function ‘MyLog(x,y)’ that writes debugging information to a file you can define a macro such as:

 #ifdef DEBUG#define LOG(a,b)   MyLog(a,b);#else#define LOG(a,b)#endif

Using conditional compilation, you can remove the ‘MyLog’ code from your Release version. However, in case of logging, you want to pass a variable amount of parameters most of the time. In this case the macro definition mentioned above doesn’t work. Nevertheless, there is a nice workaround. The solution is to redefine the macro as:

 #ifdef DEBUG#define LOG(a)   MyLog a;#else#define LOG(a)#endif

In your code you should use it as:

 …LOG ((a,b,c))…LOG ((a,b,c,d,e))…

By putting the parameters between double brackets, you can pass a variable amount of parameters to your macro.