Multi-statement Macros in C++

Question

In C++, is it possible to make a multi-statement macro with nested if statements inside of it like the one below? I\'ve be

Answer 1

For a multi-line macro you need to add a \ character to the end of all but the last line to tell the macro processor to continue parsing the macro on the next line, like so:

#define MATCH_SYMBOL( symbol, token) \
     if(something == symbol){        \
          if( symbol == '-'){        \
          }else if (symbol != '-'){  \
          }                          \
     other steps;                    \
     }

Right now, it's trying to interpret it as a 1-line macro and then some actual code at the top of your file, which isn't what you want:

#define MATCH_SYMBOL( symbol, token)

// and then... wrongly thinking this is separate...

 if(something == symbol){ // symbol was never defined, because the macro was never used here!
      if( symbol == '-'){
      }else if (symbol != '-'){
      }
 other steps;
 }