/******************************************************************************
 ***   FILE: cathcing.cpp
 ***   DATE: 03/18/2004
 *** AUTHOR: Daniel Dementiev
 ***   GOAL: This program illustrates how to throw and catch different types of
 ***         exceptions standard and user defined. It also shows how to set
 ***         a user defined terminate function - the function that is to be
 ***         executed if an exception thrown and no appropriate catch() is
 ***         found.
 ***         To compile with MS Visual Studio command line compiler use:
 ***          c:\...> cl catching.cpp /EHsc /GR
 ******************************************************************************/
#include <iostream>
#include <stdexcept>

using namespace std;


class UserDefinedException : public logic_error {
   public:
      UserDefinedException(const string &msg) : logic_error(msg) {};
};


void my_terminate_function( )
{
   cout<<"Uncaught exception detected. I'll quit.\n"<<endl;
   exit(1);
}


bool user_prompt() throw(...)
{
   cout<<"\nPlease enter one of the following:\n"
       <<" 1 - to raise a UserDefinedException\n"
       <<" 2 - to raise a logic_error exception\n"
       <<" 3 - to raise a bad_alloc exception\n"
       <<" 4 - to divide by zero\n"
       <<" 0 - to quit\n"
       <<"Your choice: ";
   int i;
   cin>>i;
   switch( i ){
      case 1: throw UserDefinedException("as you asked this is my own exception");
      case 2: throw logic_error("some logic error occured");
      case 3: throw bad_alloc("cannot allocate enough memory");
      case 4: throw overflow_error("trying to divide by zero");
      case 0: throw 7; // thrown exception that won't be caugth
      default:
         throw domain_error("you entered an invalid number");
   }
}


void main()
{
   bool time_to_stop = false;
   terminate_handler oldHand = set_terminate(my_terminate_function);

   while( ! time_to_stop ){
      try{
         time_to_stop = user_prompt();
      }
      catch(UserDefinedException &e){
         cerr<<"UserDefinedException caught: "<<e.what()<<endl;
      }
      catch(logic_error &e){
         cerr<<"logic_error caught: "<<e.what()<<endl;
      }
      catch(runtime_error &e){
         cerr<<"runtime_error caught: "<<e.what()<<endl;
      }
      catch(exception &e){
         cerr<<"exception "<<typeid(e).name()<<" caught: "<<e.what()<<endl;
      }
   }
}