From: musiphil@bawi.org   
      
   On 2012-12-22 12:09, Richard wrote:   
   >   
   > iii) where I need to build a single token from a fixed part and a   
   > varying part.  The preprocessor's token-pasting operator, #, does this   
   > for me and I am unaware of anything else provided by the core language   
   > that can do this.   
      
   You actually mean ## here. :)   
      
   I agree that # is also useful, though. One recent case of mine was   
   something like this:   
      
   void print(std::ostream& os, const char* name, const std::set<...>& set);   
      
   #define PRINT_SET(n) print(*log_file, #n, n)   
        PRINT_SET(added_states);   
        PRINT_SET(removed_states);   
        PRINT_SET(ignored_states);   
        PRINT_SET(unignored_states);   
   #undef PRINT_SET   
      
   I don't see how I could have achieved the same effect with similar   
   or less effort without a macro.   
      
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   Seungbeom Kim   
      
      
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