Re: interface problem

[Ary Borenszweig]

Trass3r wrote:
Cast the instance to the base class and call the method?

Surprisingly this does compile.
What are the rules for casting between classes?

Normally you can cast A to B if B inherits from A. But this seems not to 
be the case in D. The following compiles without complains:

import std.stdio;

interface I {
}

class A : I {
}

class B {
}

int main() {
  I i = new A();
  A a = cast(A) i;
  B b = cast(B) i; // shouldn't compile
  B c = cast(B) a; // shouldn't compile

  writeln(a);
  writeln(b);
  writeln(c);

  return 0;
}

And prints:

main.A
null
null

I'll move this to another thread.