Re: Hidden Virtual Functions
Re: Hidden Virtual Functions
- Subject: Re: Hidden Virtual Functions
- From: Clark Cox <email@hidden>
- Date: Thu, 26 May 2005 09:32:36 -0400
On 5/23/05, William Rector <email@hidden> wrote:
> I'm using Xcode 2.0 OS X 10.4.1 and moving several C++ projects from CW 9.5
> to Xcode.
>
>
> I am getting a bunch of warnings of hidden virtual functions and am
> wondering if Xcode is really unabled to match the right virtual function or
> the message is bogus.
> I have a base class with the following:
> virtual SInt32 ProcessKeyword(char* szKey,char* szParams);
> virtual SInt32 ProcessKeyword(UInt32 nKeyCode,char* szParams);
> I keep getting 'warning: 'virtual SInt32
> CTFReader::ProcessKeyword(char*,char*) was hidden.
> I guess I will find out soon when I get past my libraries to one of my
> applications.
I am assuming that you have something like:
class Base
{
virtual SInt32 ProcessKeyword(char* szKey,char* szParams);
virtual SInt32 ProcessKeyword(UInt32 nKeyCode,char* szParams);
};
class Derived : Base
{
//Only overloading one of them
virtual SInt32 ProcessKeyword(char* szKey,char* szParams);
};
If this is so, then the warning is correct, and it is an error if you
do something like:
Derived d;
d.ProcessKeyword(25,"asdf");
But this is still OK:
Base *b = new Derrived;
b->ProcessKeyword(25,"asdf");
You can fix this by either:
1) Adding "using Base::ProcessKeyword;" like so:
class Derived : Base
{
using Base::ProcessKeyword;
virtual SInt32 ProcessKeyword(char* szKey,char* szParams);
};
2) or making sure that you implement all overloads of ProcessKeyword
in the derrived class.
--
Clark S. Cox III
email@hidden
http://www.livejournal.com/users/clarkcox3/
http://homepage.mac.com/clarkcox3/
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