#include <iostream>

 #include <memory>

 #include <boost/shared_ptr.hpp>

 using namespace std;

 class Ex : public exception {

   typedef exception Parent;

   mutable

   auto_ptr<string> uz;

 public:

   // boost::shared_ptr<string> uz;

   Ex(const Ex &e) : Parent(e), uz(e.uz) {}

   explicit

   Ex(const char *msg = 0) {

     if( msg ) {

       try {

 	uz.reset(new string);

 	*uz = msg;

       }

       catch(...) {

 	uz.reset();

       }

     }

   }

   virtual

   const char* what() const throw() {

     if( uz.get() )

       return uz->c_str();

     return "Kivetel";

   }

   virtual ~Ex() throw() {}

 };

 static void fn1() {

   Ex e("alma");

   throw e;

 }

 static

 void fn2() {

   throw Ex("korte");

 }

 int main() {

   try {

     fn1();

   }

   catch(exception const &e) {

     cerr << "Hiba: " << e.what() << endl;

   }

   try {

     fn2();

   }

   catch(exception const &e) {

     cerr << "Hiba: " << e.what() << endl;

   }

 }