[nem-en] Late Binding in Nemerle

[Kamil Skalski]

Ok, I will commit it sometime tomorrow. I've also made some
improvements to handle static methods and I'm plannig to support
macros also:

late
  def x = foo.bar;
  System.Console.WriteLine (x)
  Nemerle.IO.print ("$x\n")   // print is a macro

On 7/20/06, Snaury <snaury at gmail.com> wrote:
> It's fine for me. :)
>
> However, with current implementation it seems one must avoid named
> parameters for .NET classes (for ComObjects named parameters work fine
> though [on MS.NET, never tested on Mono] and for MarshalByRefObjects I
> just didn't test it). DefaultBinder in MS.NET has a horrible bug which
> sometimes passes named parameters in wrong order, and Mono's
> DefaultBinder doesn't currently support named parameters at all.
>
> Consider example:
>
> public class TestClass
>   public Method(a : int, b : int, c : int = 3) : int
>     printf("TestClass.Method(%d,%d,%d)\n", a, b, c)
>     a + b + c
>
> def t = TestClass()
> def o = t : object
> def n = late o.Method(c = 1, a = 2, b = 3) :> int
> printf("Got result: %d\n", n)
>
> On MS.NET:
> TestClass.Method(3,1,2)
> Got result: 6
> On Mono:
> TestClass.Method(1,2,3)
> Got result: 6
>
> Both are wrong of course (but I must say that MS.NET doesn't *always*
> get order wrong, if there are less that 3 named parameters they will
> always be correct, btw). Not that I want to scare you, but I just want
> to mention it before you put it to nemerle codebase (even though these
> are *not* my bugs, but bugs of underlying implementations). To fix
> this on both platforms I'd need to implement my own (correct) binder,
> which is a huge work, will impact performance, and I'm still weighing
> whether I want to code all of this or just wait when both parties fix
> their binders...
>
> Anyway, you're welcome to include it. :) Just in case, because I don't
> know what version you currently have, fresh version can be taked from
> http://snaury.googlepages.com/Kitsu.Latebinding (old link just
> redirects here, though)
>
> On 7/20/06, Kamil Skalski <kamil.skalski at gmail.com> wrote:
> > Well, I played a bit with the late binding macros and they work nice. :-)
> > What do you thing about including them into Nemerle standard macros?
> >
> > For example under namespace Nemerle.Late;
>
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>


-- 
Kamil Skalski
http://nazgul.omega.pl