[Ironruby-core] Problem calling explicit interface methods

Shri Borde Shri.Borde at microsoft.com
Thu Jan 8 12:57:31 EST 2009


In IronPython, we went back and forth over this. On the one hand, the API author might have chosen to make it harder to access the method, requiring a cast like this:
  App::Cls cls = new App::Cls();
  cls.bar(); // syntax error
  IFoo ifoo = (IFoo)cls;
  ifoo.bar(); // works
OTOH, dynamic languages have no type for variables, and so you don't know if it should be an error or not. ie. How would IronRuby know if the programmer expects a variable to be of type App::Cls or of type IFoo.

IronPython ended up allowing it as long as there was no clash. If there is a clash, you have to use App::IFoo(cls).bar().

Thanks,
Shri


-----Original Message-----
From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at rubyforge.org] On Behalf Of Tomas Matousek
Sent: Thursday, January 08, 2009 8:50 AM
To: ironruby-core at rubyforge.org
Subject: Re: [Ironruby-core] Problem calling explicit interface methods

Fair enough, it could be called a feature :) There needs to be some way how to call the method.

Tomas

-----Original Message-----
From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at rubyforge.org] On Behalf Of Curt Hagenlocher
Sent: Thursday, January 08, 2009 8:05 AM
To: ironruby-core at rubyforge.org
Subject: Re: [Ironruby-core] Problem calling explicit interface methods

I'm not convinced this is exactly a bug.  There is no public 'bar' method on Cls after all.  I think IronPython would require you to say something like App::IFoo::bar(App::Cls.new()) in order to make the interface call explicit.

-----Original Message-----
From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at rubyforge.org] On Behalf Of Tomas Matousek
Sent: Thursday, January 08, 2009 7:56 AM
To: ironruby-core at rubyforge.org
Subject: Re: [Ironruby-core] Problem calling explicit interface methods

Filed bug #23494.

Tomas

-----Original Message-----
From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at rubyforge.org] On Behalf Of Alex 2k8
Sent: Thursday, January 08, 2009 2:25 AM
To: ironruby-core at rubyforge.org
Subject: [Ironruby-core] Problem calling explicit interface methods

Hello,

I am trying to call explicitly implemented interface method, but get
such error
  undefined method `bar' for #<App::Cls:0x000005c>

C# code:

    public interface IFoo
    {
        void Bar();
    }

    public class Cls : IFoo
    {
        void IFoo.Bar() { }
    }

Ruby code:
    x = App::Cls.new
    x.bar


But this one works fine:

    public class Cls : IFoo
    {
        public void Bar() { }
    }

What is wrong?

- Alex
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