Re: How to get rid of the annoying compiling warning on virtual function

From:

"Jim Langston" <tazmaster@rocketmail.com>

Newsgroups:

comp.lang.c++

Date:

Thu, 9 Oct 2008 10:57:15 -0700

Message-ID:

<QIqHk.15937$hB1.4437@newsfe02.iad>

"asm23" <asmwarrior@gmail.com> wrote in message
news:gclann$tsh$1@aioe.org...

Hi, I'm using Intel C++ compiler 9 to compiler a project. But, there are a
lot of warning saying like "virtual function override intended....". I
searched old messages in Google groups, someone already talk about this
issue. But I still confused..

This is the simple test code I copied from these messages
////////////////////////////////////////////////////////////////////
class Base {
   virtual void foo(); //*position A*
};

class Derived1 : Base {
   virtual void foo(int); //*position B*
};

class Derived2 : Derived1 {
   void foo(int); //*position C*
};
////////////////////////////////////////////////////////////////////

The compiler will report two warnings:

Warning one:

warning #1125: function "Base::foo()" is hidden by "Derived1::foo" --
virtual function override intended?

Warning Two:

warning #1125: function "Base::foo()" is hidden by "Derived2::foo" --
virtual function override intended?

In my opinion, *overriding* is only occurred between two functions which
have the same signature and parameter list. It seems that the function
prototype are different between class Base and class Derived1.

I will be very appreciated if you can give me some explanation. Thank you
for reading my post.

Unfortunately what you opionion is and what the facts are don't happen to
mesh on this. If you have the same function name, reguardless of signature,
you will hide a base function by the derived function. The best work around
is, name your function something different in your derived. Unless you
actually intended polymorphism, then fix the signatures and use the virtual
keyword in the base.