Andrei Alexandrescu, el 2 de octubre a las 13:00 me escribiste:
> I just realized that nested classes work so well with alias this,
> you'd think it was an evil plot all along. It wasn't, but I'm happy
> about the coincidence.
>
> Here's how to effect multiple subtyping in D very effectively:
>
> import std.stdio;
>
> class Base1 {
> void fun() { writeln("Base.fun"); }
> }
>
> class Base2 {
> void gun() { writeln("Base.fun"); }
> }
>
> class Multiple : Base1 {
> // Override method in Base1
> override void fun() { writeln("Multiple.fun"); }
> // Override method in Base2
> class MyBase2 : Base2 {
> override void gun() { writeln("Multiple.gun"); }
> }
> // Effect multiple subtyping
> Base2 _base2;
> alias _base2 this;
> this() {
> _base2 = new MyBase2;
> }
> }
>
> void main()
> {
> auto obj = new Multiple;
> Base1 obj1 = obj;
> obj1.fun();
> Base2 obj2 = obj;
> obj2.gun();
> }
>
> The program above segfaults because somehow obj2 is null. That is a
> bug I just reported. For now, you can replace obj2.gun() with
> obj.gun() to make things work.
>
> When we first introduced alias this, I knew multiple subtyping was
> possible. I didn't expect it to dovetail so nicely with nested
> classes.
We might have very different taste, but I find that a little... horrible.
What do you have against mixins? I think you're trying to use D as C++ :)
--
Leandro Lucarella (AKA luca) http://llucax.com.ar/
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