klao@1157: #include <iostream>
klao@1157: #include <memory>
klao@1157: 
klao@1157: #include <boost/shared_ptr.hpp>
klao@1157: 
klao@1157: using namespace std;
klao@1157: 
klao@1157: class Ex : public exception {
klao@1157: 
klao@1157:   typedef exception Parent;
klao@1157: 
klao@1157:   mutable
klao@1157:   auto_ptr<string> uz;
klao@1157: public:
klao@1157: 
klao@1157:   // boost::shared_ptr<string> uz;
klao@1157: 
klao@1157:   Ex(const Ex &e) : Parent(e), uz(e.uz) {}
klao@1157: 
klao@1157:   explicit
klao@1157:   Ex(const char *msg = 0) {
klao@1157:     if( msg ) {
klao@1157:       try {
klao@1157: 	uz.reset(new string);
klao@1157: 	*uz = msg;
klao@1157:       }
klao@1157:       catch(...) {
klao@1157: 	uz.reset();
klao@1157:       }
klao@1157:     }
klao@1157:   }
klao@1157: 
klao@1157:   virtual
klao@1157:   const char* what() const throw() {
klao@1157:     if( uz.get() )
klao@1157:       return uz->c_str();
klao@1157:     return "Kivetel";
klao@1157:   }
klao@1157: 
klao@1157:   virtual ~Ex() throw() {}
klao@1157: };
klao@1157: 
klao@1157: static void fn1() {
klao@1157:   Ex e("alma");
klao@1157:   throw e;
klao@1157: }
klao@1157: 
klao@1157: static
klao@1157: void fn2() {
klao@1157:   throw Ex("korte");
klao@1157: }
klao@1157: 
klao@1157: int main() {
klao@1157:   try {
klao@1157:     fn1();
klao@1157:   }
klao@1157:   catch(exception const &e) {
klao@1157:     cerr << "Hiba: " << e.what() << endl;
klao@1157:   }
klao@1157: 
klao@1157:   try {
klao@1157:     fn2();
klao@1157:   }
klao@1157:   catch(exception const &e) {
klao@1157:     cerr << "Hiba: " << e.what() << endl;
klao@1157:   }
klao@1157: 
klao@1157: }