PRODUCT  :  Borland C++                            NUMBER  :  733
  VERSION  :  2.0
       OS  :  DOS
     DATE  :  October 19, 1993                         PAGE  :  1/1

    TITLE  :  How to Use Variable Arguments




  /*************************************************************
  Example code for using a variable number of arguments.
  There is only one guaranteed way of accessing arguments passed
  using the ... mechanism.  The standard header file <stdarg.h> as
  specified for ANSI C will provide declarations that can be used
  by a function that does not know the number or types of its
  arguments when it is compiled.
  *************************************************************/

  #include <stdarg.h>
  void real_handler(const char*, va_list);
  void my_error_handler(const char* format, ...)
  {
      // ...
      va_list ap;
      va_start(ap,format);
      real_handler(format,ap);  /* get arguments */
      va_end(ap);
      exit(99);
  }

  void real_handler(const char* format, va_list ap)
  {
      // assume that 'format' tells us that
      // three arguments, a char*, an int, and a double,
      // are passed - in that order - by the va_list 'ap'
      char* p = va_arg(ap,char*);
      int i = va_arg(ap,int);
      double d = va_arg(ap,double);
  }

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