That would be great for databinding wpf :) --- Met vriendelijke groeten - Best regards - Salutations Ivan Porto Carrero Blog: http://flanders.co.nz Twitter: http://twitter.com/casualjim Author of IronRuby in Action (http://manning.com/carrero)
Vince Lombardi<http://www.brainyquote.com/quotes/authors/v/vince_lombardi.html> - "We didn't lose the game; we just ran out of time." On Tue, May 12, 2009 at 10:35 PM, Curt Hagenlocher <cu...@microsoft.com>wrote: > But this redirection can be done entirely at the level of Ruby > metaprogramming, can’t it. I’m pretty sure I’ve seen Proxy objects defined > in ActiveSupport that do something quite similar. (Full disclosure, though: > I’m really a Ruby noob.) > > > > By contrast, consider the following > > > > class C > > clr_property :Value, System::Int32, ::get_value, ::set_value > > > > def get_value > > 42 > > end > > def set_value > > raise RuntimeError, 'Read-only, sucker!' > > end > > end > > > > The *hypothetical* class method clr_property might set some kind of > metadata on the class which would be picked up by the CLS type generator, > and turned into a CLS-visible property on the generated type with getter and > setter methods. This is the sort of thing I had in mind when I described > “additional metadata”. > > > > *From:* ironruby-core-boun...@rubyforge.org [mailto: > ironruby-core-boun...@rubyforge.org] *On Behalf Of *Ivan Porto Carrero > *Sent:* Tuesday, May 12, 2009 12:58 PM > *To:* ironruby-core@rubyforge.org > *Subject:* Re: [Ironruby-core] interop question > > > > About the metadata.. I think in my case it would be great if I could > redirect the methods on the type to methods on a property of that type. > > > > So for the ShurikenProxy class I would like to say that it needs to forward > all method calls to the property subject for example possibly with an > exception list of methods that won't be forwarded. I guess that would get me > the behavior I'm expecting. Would that be possible? > --- > Met vriendelijke groeten - Best regards - Salutations > Ivan Porto Carrero > Blog: http://flanders.co.nz > Twitter: http://twitter.com/casualjim > Author of IronRuby in Action (http://manning.com/carrero) > > On Tue, May 12, 2009 at 4:49 PM, Curt Hagenlocher <cu...@microsoft.com> > wrote: > > We can’t apply all Ruby standards when we travel back to staticland. > > > > When you define and use a Ruby class, we need to create a static CLR type > to represent that class. This underlying type is constrained by what can be > done with CLR types; and in particular, it’s structure is immutable. So we > can’t just go back to this type and tell it that it should now implement > IWeapon – we need to have known this at the time the class is created. > > > > Now, it’s possible to be pretty flexible about the ingredients that go into > the type. So if the IronRuby community decides to change how this underlying > type is created – perhaps by taking additional metadata into account – then > that’s no problem. But as soon as you create the first instance of > ShurikenProxy, that’s when we need to freeze things and actually emit the > type. > > > > In this particular case, when creating a proxy for an object that > implements certain CLR interfaces, the proxy itself will have to implement > the same interfaces if the object is going to be passed back to static code. > But Ruby’s metaprogramming makes this pretty easy – get all ancestors of > class Module whose to_clr_type is not nil, and simply include those into a > newly-created proxy class programmatically. > > > > > > *From:* ironruby-core-boun...@rubyforge.org [mailto: > ironruby-core-boun...@rubyforge.org] *On Behalf Of *Ivan Porto Carrero > *Sent:* Tuesday, May 12, 2009 12:23 AM > *To:* ironruby-core > *Subject:* [Ironruby-core] interop question > > > > > > Let's say I have these interfaces > > > > public interface IWeapon{ > > void Attack(IWarrior warrior); > > int Damage(); > > } > > > > public interface IWarrior > > { > > > > int Id { get; } > > string Name { get; set; } > > bool IsKilledBy(IWeapon weapon); > > void Attack(IWarrior target, IWeapon weapon); > > } > > > > And one implementor defined in C# > > > > public class Ninja : IWarrior{ > > > > private readonly int _id; > > > > public string Name { get; set; } > > public int Id { get { return _id; } } > > > > public void Attack(IWarrior target, IWeapon weapon){ > > weapon.Attack(target); > > } > > > > public bool IsKilledBy(IWeapon weapon) > > { > > return weapon.Damage() > 3; > > } > > } > > > > Now if I create an implementation of IWeapon in Ruby > > > > class Shuriken > > > > include IWeapon > > > > def damage > > 2 > > end > > end > > > > which I then proceed to wrap in a forwarding class > > > > class ShurikenProxy > > > > instance_methods.each do |name| > > undef_method name unless name =~ /^__|^instance_eval$/ > > end > > > > def initialize > > @subject = Shuriken.new > > end > > > > def method_missing(m, *a, &b) > > @subject.send(m, *a, &b) > > end > > > > end > > > > Then I would expect this to work: > > > > ninja = Ninja.new > > ninja.is_killed_by ShurikenProxy.new > > > > only it tells me that the ruby object isn't an implementation of IWeapon > > while by all ruby standards it is. if you ask it for its ancestors it's got > IWeapon there > > if you ask it for its class it tells you Shuriken and not ShurikenProxy > > > > Is that supposed to happen? > > > > > --- > Met vriendelijke groeten - Best regards - Salutations > Ivan Porto Carrero > Blog: http://flanders.co.nz > Twitter: http://twitter.com/casualjim > Author of IronRuby in Action (http://manning.com/carrero) > > Emma Goldman<http://www.brainyquote.com/quotes/authors/e/emma_goldman.html> - > "If voting changed anything, they'd make it illegal." > > > _______________________________________________ > Ironruby-core mailing list > Ironruby-core@rubyforge.org > http://rubyforge.org/mailman/listinfo/ironruby-core > > > > _______________________________________________ > Ironruby-core mailing list > Ironruby-core@rubyforge.org > http://rubyforge.org/mailman/listinfo/ironruby-core > >
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