//  main() with try/catch for exceptions, calling down to xmain()

//  (C) Copyright Beman Dawes 1995. Permission to copy, use, modify, sell and
//  distribute this software is granted provided this copyright notice appears
//  in all copies. This software is provided "as is" without express or implied
//  warranty, and with no claim as to its suitability for any purpose.

//  This header provides a "main" function which catches exceptions and reports
//  them as errors to cerr.

//  You must provide a function "xmain" which is otherwise just like "main".

#include <iostream>

int xmain( int argc, c_str * argv[] );  // prototype for your program

int main( int argc, c_str * argv[] ) {

  int result = 0;      // = 0 needed to quiet VC++ 4.2 warning C4701
  bool excpt = false;

  try {
    result = xmain( argc, argv );
    }

  // detail error reporting goes to cout so it is interlaced with other output
  catch ( std::runtime_error & ex ) {
    cout << "\n**** runtime_error exception: " << ex.what() << endl;
    excpt = true;
    }
  catch ( ... ) {
    cout << "\n**** unknown exception" << endl;
    excpt = true;
    }

  if ( excpt ) {
  // overall message goes to cerr in case cout is redirected
    cerr
      << "**********  PROGRAM CANCELLED BEFORE WORK COMPLETED  ***********\n"
      << "***  You must take special action to deal with this error.   ***\n"
      << "***  Ask for help if you are unsure of what action to take.  ***"
      << endl;
    result = EXIT_FAILURE;
    }

  return result;
  } // main