RE: c++ and inheritance

 

The keyword I think you're looking for is protected.  It should do what you
want.  If not what you would have to do is rap your message calls in
functions thus keeping it private and allowing public functions to access it
correctly.  I think though Protected does what you want you use it like
public and private.  Just go read the docs on that and I think your all set.

 

Ken

 

From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Tyler
Littlefield
Sent: Friday, December 26, 2008 3:25 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: c++ and inheritance

 

Hello list,

I'm writing a basic framework for some of my applications to use, to keep me
from reinventing the wheel every time I start something new

I'm working on a basic Exception class, which I can use coupled with others
to throw exceptions when needed.

now, here's my problem.

My exception looks somewhat like this:

class Exception

{

public:

virtual Exception(char* err);

virtual exception();

~exception();

virtual void SetMessage(char* err);

virtual char* GetMessage();

private:

char* Message;

};

this works, but when I have other exceptions inheriting this, I have to
inherit both public and private scope.

Is there a more efficient way of doing this?

I can do something like:

class MemoryException:public Exception

{

...

private:

char* Message

};

but that requires that message is defined in every new exception class.

I would like message to remain private so that it does not get changed by
calls, and so that if needed SetMessage can be overridden to just return
without changing the message.

TIA,

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