interface function overloading

[%u]

== Quote from Stanislav Blinov (blinov at loniir.ru)'s article
> In C++ I sometimes have similar problems, especially with multiple
> inheritance. Though, as Jonathan mentioned, those problems are even more
> annoying because of hijacking: you don't always immediately notice them.
> Long ago I've decided to always employ conversion methods for such
> cases, which in D might look like this:
> class C : I2{
>    I1 toI1() { return this; }
>    I2 toI2() { return this; }
> }
> This unclutters the code a bit, i think:
> void main(){
>    func((new C).toI2()); // compare with func(cast(I2)(new C));
>    C c = new C;
>    func(c.toI1()); // compare with(cast(I1)c);
> }
> The calls to conversion methods could be even shorter if they were
> properties, because of omitted parens. Anyway, once I stuck to this
> strategy, it never failed me.

I employ this strategy as well but I thought I would like to try the overload
method, just to experiment :)