title: Foreach macro on macros arguments
body: <p>I wonder if it is possible to write a macro foreach on macros arguments. Here is what want to do:</p>
  
  <pre><code>#define PRINT(a) printf(#a": %d", a)
  #define PRINT_ALL(...) ? ? ? THE PROBLEM ? ? ? 
  </code></pre>
  
  <p>And possible usage:</p>
  
  <pre><code>int a = 1, b = 3, d = 0;
  PRINT_ALL(a,b,d);
  </code></pre>
  
  <p>Here is what I achieved so far</p>
  
  <pre><code>#define FIRST_ARG(arg,...) arg
  #define AFTER_FIRST_ARG(arg,...) , ##__VA_ARGS__     
  #define PRINT(a) printf(#a": %d", a)
  #define PRINT_ALL PRINT(FIRST_ARG(__VA_ARGS__)); PRINT_ALL(AFTER_FIRST_ARG(__VA_ARGS__))
  </code></pre>
  
  <p>This is a recursive macro, which is illegal. And another problem with that is <code>stop condition</code> of recursion.</p>