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Hi,
can someone help me to solve thise problem:
Imagine I've got this class hierachy:
class A
{
virtual bool foo( A bar ) = 0;
}
class B : A
{
bool foo( B bar )
{
...
}
....
}
int main( void )
{
B foobar;
}
this won't compile as my class B is still abstract as I didn't provide a
"bool foo( A bar )" member.
But I only want class A to be an interface that tells everybody what to
expect from it's derivated classes. And one of these things is, that
every child must have a member that is called "foo" and has one
parameter of the type of the child itself.
How do I achieve that?
The only workaround I can come up with is, that I have:
class B
{
friend bool foo( class B, class B );
}
bool foo( class B bar1, class B bar2 )
{
...
}
I this doesn't guarantee me, that every child of A must have a foo
function...
Thanks,
Christian
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