Re: Is this a bug of gcc ?

[Andrew Pinski <pinskia at physics dot uc dot edu>]

On Mar 6, 2006, at 8:12 AM, Pierre Chatelier wrote:

> Hello,
>
> I cannot compile a code that seems correct to me. I have tried with 
> gcc 3.3 and gcc 4.0.1 on MacOS X-ppc, and gcc 4.0.1 on Linux i686.
>
> Here is the code, that uses pure virtual functions and simple 
> inheritance.
>
> //-------------------------------------
> struct a
> {
>   virtual int foo() =0;
>   virtual ~a(){}
> };
>
> struct b : public a
> {
>   virtual int foo(int a) =0;
>   virtual ~b(){}
> };
>
> struct c : public b
> {
>   int test()
>    {
>      return (foo() + // <--- the compiler claims here that it cannot 
> find foo()
>              foo(2));
>   }
>   virtual ~c(){}
> };
This is not a bug in gcc.  foo in b hides the one from a.
You can "fix" the source by:
struct b : public a
{
  virtual int foo(int a) =0;
  using a::foo;
  virtual ~b(){}
};

Which interjects foo from a into b's "namespace".

-- Pinski