Re: Derived class hiding a name
jordigh@gmail.com wrote:
On May 22, 4:57 pm, nickf3 <nic...@gmail.com> wrote:
As soon as the compiler sees B::f it stops going up the scope
with the lookup. This could've been fixed by including "using
A::f;" in the public section of B, but that's itself is ambiguous
due
to two overloaded members of A.
I eventually realised that my class interface was a little weird
anyways, and I changed the private access to protected. I'm not
exactly sure yet when it's desirable to have private virtuals, which
seem like a weird idea.
It is not really weird at all, if the idea is to override behavior of
base classes, but not call the base functions directly.
But just for academic interest, is there a reason why the standard
doesn't allow me to be more specific about the using declaration?
Why can't I say "using::A(foo)" so that the compiler doesn't try to
also bring the inaccessible overloaded private function into scope
and only brings the one that I need?
The "using" is about making names visible, not specific functions or
variables.
If you need one specific function from the base class, you can use an
indirection.
class B : public A
{
void f(int x)
{ A::f(x); }
// ...
};
Bo Persson
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