Re: ambiguity in diamond inheritance
On 8 mar, 08:57, karthikbalaguru <karthikbalagur...@gmail.com> wrote:
On Mar 7, 6:11 pm, Pete Becker <p...@versatilecoding.com> wrote:
On 2008-03-06 23:34:45 -0500, karthikbalaguru
<karthikbalagur...@gmail.com> said:
I understand the Diamond Problem and the solution of
"Virtual Inheritance" that is used to overcome ambiguity.
But, i wonder why should the Diamond problem arise. This
should be taken care by C++ internally and resolved. Why
C++ could not handle it internally without asking us to do
the 'virtual inheritance'?
"The Diamond Problem" arises because the writer of a class
hierarchy didn't understand how inheritance works.
struct A
{
int i;
};
struct B : A
{
};
struct C : A
{
};
struct D : B, C
{
void f();
};
void D::f()
{
i = 3; // error: ambiguous
}
There are two separate "i" members in D. There's no way the
compiler can "handle it internally".
But, Why is the compiler unable to handle it internally ?
Handle what? How is the compiler supposed to know which i
(B::A::i or C::A::i) you want to refer to?
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