Re: [Dev-C++] Exception Handling

[Wolf P. <pe...@re...>]

Yes, but you should catch the base exception class by (const-) reference.
for example:

class GeneralX {
  public:
  // properties ...
  virtual bool IsSpecial() const { return false; } // 
Standard-Implementation
};

class SpecificX: public GeneralX {
  public:
  // further properties ...
  SpecificX(): m_kind( 815 ) {}
  virtual bool IsSpecial() const { return m_kind > 0; } // overrides 
Standard-Implementation using new Member
  int m_kind;
};

void may_emit(bool x_trigger) {
  // do something...
  if( x_trigger )  {
    throw SpecificX();
  }
   // do something else...
}

bool test_byref( bool x_trigger) {
  bool bSpecificCaught = false;
  try {
    may_emit(x_trigger);
  }
  catch( const GeneralX& e ) { // catch by reference
     // do something with e...
     // if you check against SpecialX you would succeed:
     bSpecificCaught = e.IsSpecial();
  }
  return bSpecificCaught;
}

bool test_byvalue(bool x_trigger) {
  bool bSpecificCaught = false;
  try {
     may_emit(x_trigger);
  }
  catch( GeneralX e ) { // catch by value
     // do something with e...
     // if you check against SpecialX you would succeed:
     bSpecificCaught = e.IsSpecial();
  }
  return bSpecificCaught;
}

bool test_all_passed() {
  bool by_ref_result = test_byref(true);
  bool by_value_result = test_byvalue(true);
  return
    (by_ref_result == true) &&
    (by_value_result == false);
}

This compiles with devcpp test_all_passed() returns true for me.

Wolf Peuker

Noorez Kassam schrieb:

> For my program, I have a main exception class to handle general 
> exceptions and all the other exceptions are derived from that one. In 
> the catch block, can i catch an error of type "general exception" for 
> all the exceptions derived from that class?
>
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