generic function with structural types questions

[Lars Hansen]

It's a spec issue.  --lars 

> -----Original Message-----
> From: es4-discuss-bounces at mozilla.org 
> [mailto:es4-discuss-bounces at mozilla.org] On Behalf Of Yuh-Ruey Chen
> Sent: 15. november 2007 01:53
> To: Lars T Hansen
> Cc: es4-discuss
> Subject: Re: generic function with structural types questions
> 
> By "fixed", do you mean an RI bug or a spec issue? If it's 
> just an RI bug, can you tell me what those exprs are supposed 
> to evaluate to?
> 
> -Yuh-Ruey Chen
> 
> Lars T Hansen wrote:
> > At present, generic functions do not discriminate on 
> structural types.
> >  This probably needs to be fixed, but I've not looked into it.
> >
> > --lars
> >
> > On 11/12/07, Yuh-Ruey Chen <maian330 at gmail.com> wrote:
> > > Given the following definitions:
> > >
> > > class C {var p: int};
> > > type S1 = {p: int};
> > > type S2 = {p: int, p2: double};
> > > generic function foo(x);
> > > generic function foo(x: *) 0
> > > generic function foo(x: C) 1
> > > generic function foo(x: S1) 2
> > > generic function foo(x: S2) 3
> > > generic function foo(x: like S1) 4
> > > generic function foo(x: like S2) 5
> > > var o1: C = new C();
> > > var o2: S1 = {p: 10};
> > > var o3: S2 = {p: 10, p2: 3.14};
> > > var o4 = {p: 10};
> > > var o5 = {p: 10, p2: 3.14};
> > > var o6 = {p: 10, p2: 3.14, p3: "hi"};
> > >
> > > What do the following exprs evaluate to?
> > > foo(o1);
> > > foo(o2);
> > > foo(o3);
> > > foo(o4);
> > > foo(o5);
> > > foo(o6);
> > >
> > > Also, I know that S1 <: Object, but is S2 <: S1? I've looked at 
> > > 
> http://wiki.ecmascript.org/doku.php?id=clarification:type_system and 
> > > it's not clear to me. Is it still true that C <: S1?
> > >
> > > -Yuh-Ruey Chen
> > > _______________________________________________
> > > Es4-discuss mailing list
> > > Es4-discuss at mozilla.org
> > > https://mail.mozilla.org/listinfo/es4-discuss
> > >
> >
> >   
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