That's fantastic, Tomas, thanks! Is there any way to pass a block, lambda, or Proc into the slot for the delegate, or perhaps a way to create a .NET delegate (or Expression) from a block, lambda, or Proc?
Thanks, Ryan Riley Email: ryan.ri...@panesofglass.org LinkedIn: http://www.linkedin.com/in/ryanriley Blog: http://wizardsofsmart.net/ Twitter: @panesofglass Website: http://panesofglass.org/ On Tue, Feb 2, 2010 at 1:36 AM, Tomas Matousek <tomas.matou...@microsoft.com > wrote: > Actually, you can add Ruby methods to List<T> … IronRuby type system does > some magic for you J: > > > > >>> include System::Collections::Generic > > => Object > > >>> List[Fixnum].included_modules > > => [System::Collections::Generic::List[T], > System::Collections::Generic::IList[Fixnum], > System::Collections::Generic::IList[T], > System::Collections::Generic::ICollection[Fixnum], > System::Collections::Generic::ICollection[T], > System::Collections::Generic::IEnumerable[Fixnum], > System::Collections::Generic::IEnumerable[T], > System::Collections::IEnumerable, Enumerable, System::Collections::IList, > System::Collections::ICollection, System::Collections::Generic, Kernel] > > > > As you can see the List<> generic type definition is treated as a module > that is mixed in each of its instantiations. Although there are no > predefined methods on it you can open it and add some. First we need to get > Ruby class for List<T>. If you index System.Collections.Generic.List by a > fixnum instead of a class/module you’ll get the generic definition of arity > 1. Let’s name it ListOfT: > > > > >>> ListOfT = List[1] > > > > And then we can open it up: > > > > >>> module ListOfT > > ... def size > > ... count > > ... end > > ... end > > => nil > > >>> l = List[Fixnum].new > > => [] > > >>> l.add(1) > > => nil > > >>> l.add(2) > > => nil > > >>> l.size > > => 2 > > > > Tomas > > > > > > *From:* ironruby-core-boun...@rubyforge.org [mailto: > ironruby-core-boun...@rubyforge.org] *On Behalf Of *Orion Edwards > *Sent:* Monday, February 01, 2010 6:31 PM > *To:* ironruby-core@rubyforge.org > *Subject:* Re: [Ironruby-core] A nicer syntax for generic extension > methods > > > > IIRC you can open "concrete" generics, but not "open" ones: In plain > english this means you can add methods to List<string> but not List<T>. > > > > This is essentially because List<T> isn't a real type in the CLR, it's > basically some metadata that can be used to build a real type when the T is > supplied. > > > > You could as an alternative add methods to the underlying non-generic > IEnumerable interface, but then you'd have to do some run-time reflection to > figure out that your List is actually a List<string>... This is probably not > nice. > > > > In theory when CLR4 lands and has support for co/contra variant generics, > List<object> should match List<string> and everything else, but I don't know > if IronRuby would also work for this? > > > > Good luck > > On Tue, Feb 2, 2010 at 7:52 AM, Ryan Riley <ryan.ri...@panesofglass.org> > wrote: > > I have been trying to figure out how to Rubify generic extension methods > for use with the likes of Rx, Open XML SDK, etc. Ivan went over it a bit > with me this weekend, but I'm still having difficulty including a module > within a .NET type. Is that even possible? > > > > ... > > > > The questions I'm not able to answer are: > > 1. Can I somehow open up a .NET class, say > System::Collections::Generic::List[T] and include the EnumerableExtensions? > So far, I'm finding that's a no. > 2. How do I hook in the included(base) method above? I'm assuming > that's a one-time call, but I don't see anywhere that it's called when a > module is included. Do I need to use a before_filter or perform that action > at the beginning of the linq_select method? > > > > Thanks! > > > Ryan Riley > > Email: ryan.ri...@panesofglass.org > LinkedIn: http://www.linkedin.com/in/ryanriley > Blog: http://wizardsofsmart.net/ > Twitter: @panesofglass > Website: http://panesofglass.org/ > > _______________________________________________ > 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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