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─────C/C++ Language─────────────────────────────────────────────────────────
 
  Operator:  ##
 
  Syntax:    token##parameter
             parameter##token
 
  Summary:   The token-pasting operator, used only with macros. If ##
             precedes or follows a formal parameter in the definition
             of a macro, the actual argument is concatenated with the
             token on the other side of the ## when the macro is
             expanded. For example,
 
                  #define printvar(x) printf("%d\n", var##x)
 
             causes the statement
 
                  printvar(7);
 
             to be expanded into
 
                  printf("%d\n",var7);
                                    -♦-