Weed Wrote:
> >>>>> Well, D class code here is not equivalent to C++ class code. D code has
> >>>>> more features, namely, it's polymorphic: C.opAdd is able to work with
> >>>>> classes, derived from C, while corresponding C++ code is unable to do
> >>>>> so.
> > In C++ you can't pass object derived from C to opAdd method. In D you can.
>
> I am do not agree with you:
>
> // C++:
> class C {
> public:
> virtual void doSomething( C src ) {}
> };
>
> class C2 : public C {
> };
>
> int main( int argc, char* argv[] ) {
> C c;
> C2 c2;
>
> c.doSomething( c2 );
>
> return 0;
> }
Well, you can pass descendant objects :) I was surprised by this destructive
feature. But code is still not polymorphic. Consider the following code:
class C
{
public:
virtual char* doSomething( C src )
{
return src.Method();
}
virtual char* Method()
{
return "It's C.";
}
};
class C2 : public C
{
public:
virtual char* Method()
{
return "It's C2.";
}
};
int main(void)
{
C c;
C2 c2;
printf("%s\n",c.doSomething(c));
printf("%s\n",c.doSomething(c2));
return 0;
}
What do you think is its output?
