On Sat, Jun 16, 2012 at 11:52 AM, Namespace <rswhi...@googlemail.com> wrote:
> Why work this:
>
> [code]
> class Foo { }
> class Bar : Foo { }
> class Quatz : Bar { }
>
> void foo(Foo f) {
>
> }
>
> void main() {
> Foo f = new Foo();
> Foo f2;
>
> foo(f);
> foo(f2);
>
> Bar b = new Bar();
> Bar b2;
>
> foo(b);
> foo(b2);
>
> Quatz q = new Quatz();
> Quatz q2;
>
> foo(q);
> foo(q2);
> }
> [/code]
>
> but not:
>
> [code]
> import std.stdio;
>
> class Foo { }
> class Bar : Foo { }
> class Quatz : Bar { }
>
> void bar(Foo[] fs) {
>
> }
>
> void main() {
> Foo[] fs = [new Foo()];
> Foo[] fs2;
>
> bar(fs);
> bar(fs2);
>
> Bar[] bs = [new Bar()];
> Bar[] bs2;
>
> bar(bs);
> bar(bs2);
>
> Quatz[] qs = [new Quatz()];
> Quatz[] qs2;
>
> bar(qs);
> bar(qs2);
> }
> [/code]
>
> I think that should work also.
The problem is that this would also work:
[code]
import std.stdio;
class Foo { }
class Bar : Foo { }
class Quatz : Bar { }
void bar(Foo[] fs) {
fs[0] = new Foo(); // <-- OH NOES
}
void main() {
Foo[] fs = [new Foo()];
Foo[] fs2;
bar(fs);
bar(fs2);
Bar[] bs = [new Bar()];
Bar[] bs2;
bar(bs);
bar(bs2);
Quatz[] qs = [new Quatz()];
Quatz[] qs2;
bar(qs);
bar(qs2);
}
[/code]
