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Philippe Leybaert

2010-Jun-29 16:56 UTC

[Ironruby-core] Calling constructor when static .New() method is defined

Shay Friedman suggested I''d post this to the mailing list, as it may be
a bug in IronRuby:

It seems impossible to call a constructor when there is a static .New() method
defined on a class.

This is a minimal test case demonstrating the problem:

.NET (C#) class:

    public class Tester
    {
        public static void New()
        {
            Console.WriteLine("In Tester.New()");
        }

        public Tester()
        {
            Console.WriteLine("In constructor");
        }
    }

IronRuby code:

    Tester.new
    Tester.New

The ruby code above calls Tester.New() in both cases. There seems to be no way
to call the regular constructor of this class.

Tomas Matousek

2010-Jun-29 17:24 UTC

head link

[Ironruby-core] Calling constructor when static .New() method is defined

You can call CLR constructor using "clr_new" method:

Tester.clr_new

Tomas

-----Original Message-----
From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at
rubyforge.org] On Behalf Of Philippe Leybaert
Sent: Tuesday, June 29, 2010 9:57 AM
To: ironruby-core at rubyforge.org
Subject: [Ironruby-core] Calling constructor when static .New() method is
defined

Shay Friedman suggested I''d post this to the mailing list, as it may be
a bug in IronRuby:

It seems impossible to call a constructor when there is a static .New() method
defined on a class.

This is a minimal test case demonstrating the problem:

.NET (C#) class:

    public class Tester
    {
        public static void New()
        {
            Console.WriteLine("In Tester.New()");
        }

        public Tester()
        {
            Console.WriteLine("In constructor");
        }
    }

IronRuby code:

    Tester.new
    Tester.New

The ruby code above calls Tester.New() in both cases. There seems to be no way
to call the regular constructor of this class.

_______________________________________________
Ironruby-core mailing list
Ironruby-core at rubyforge.org
http://rubyforge.org/mailman/listinfo/ironruby-core

Philippe Leybaert

2010-Jun-29 18:30 UTC

head link

[Ironruby-core] Calling constructor when static .New() method is defined

Thanks, that does seem to work.

But I personally think this behavior is completely wrong. Calling .new from
IronRuby should always call the constructor, not a static method named .New()
that happens to exist somewhere in the class hierarchy. (if the .New() method is
defined in a base class, you get the same problem).


Philippe

-----Original Message-----
From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at
rubyforge.org] On Behalf Of Tomas Matousek
Sent: dinsdag 29 juni 2010 19:24
To: ironruby-core at rubyforge.org
Subject: Re: [Ironruby-core] Calling constructor when static .New() method is
defined

You can call CLR constructor using "clr_new" method:

Tester.clr_new

Tomas

-----Original Message-----
From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at
rubyforge.org] On Behalf Of Philippe Leybaert
Sent: Tuesday, June 29, 2010 9:57 AM
To: ironruby-core at rubyforge.org
Subject: [Ironruby-core] Calling constructor when static .New() method is
defined

Shay Friedman suggested I''d post this to the mailing list, as it may be
a bug in IronRuby:

It seems impossible to call a constructor when there is a static .New() method
defined on a class.

This is a minimal test case demonstrating the problem:

.NET (C#) class:

    public class Tester
    {
        public static void New()
        {
            Console.WriteLine("In Tester.New()");
        }

        public Tester()
        {
            Console.WriteLine("In constructor");
        }
    }

IronRuby code:

    Tester.new
    Tester.New

The ruby code above calls Tester.New() in both cases. There seems to be no way
to call the regular constructor of this class.

_______________________________________________
Ironruby-core mailing list
Ironruby-core at rubyforge.org
http://rubyforge.org/mailman/listinfo/ironruby-core

_______________________________________________
Ironruby-core mailing list
Ironruby-core at rubyforge.org
http://rubyforge.org/mailman/listinfo/ironruby-core

Jimmy Schementi

2010-Jun-29 18:58 UTC

head link

[Ironruby-core] Calling constructor when static .New() method is defined

Philippe Leybaert wrote: > But I personally think this behavior is completely wrong. Calling .new from
> IronRuby should always call the constructor, not a static method named
> .New() that happens to exist somewhere in the class hierarchy. (if the
> .New() method is defined in a base class, you get the same problem).
"new" is just a Ruby method on the Class object, which Ruby happens to
call to construct an object. Because it''s just a method, it can be
overridden. For example, a Ruby class''s #new can be overridden to
return ANY object.
>>> class Foo...   def self.new
...     42
...   end
... end
=> nil>>> Foo.new
=> 42>>> Foo.new.class
=> Fixnum>>>
So, anywhere in the class hierarchy, #new can be overridden. For example, if a
base class overrides new, it does so for all its subclasses also, just as normal
inheritance tells it do:
>>> class Bar < Foo... end
=> nil>>> Bar.new=> 42

At a high-level, the way IronRuby''s .NET interop works is by treating
any .NET-based code as if it were Ruby code, so a CLR Type will be shown as a
Ruby Class. Therefore, defining a "New" method in C# is the moral
equivalent of defining "new" on any Ruby class, which will override
Class#new, which in turn overrides the CLR .ctor. Which is why
"clr_new" is provided.

~js
> -----Original Message-----
> From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-
> bounces at rubyforge.org] On Behalf Of Tomas Matousek
> Sent: dinsdag 29 juni 2010 19:24
> To: ironruby-core at rubyforge.org
> Subject: Re: [Ironruby-core] Calling constructor when static .New() method
is
> defined
> 
> You can call CLR constructor using "clr_new" method:
> 
> Tester.clr_new
> 
> Tomas
> 
> -----Original Message-----
> From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-
> bounces at rubyforge.org] On Behalf Of Philippe Leybaert
> Sent: Tuesday, June 29, 2010 9:57 AM
> To: ironruby-core at rubyforge.org
> Subject: [Ironruby-core] Calling constructor when static .New() method is
> defined
> 
> Shay Friedman suggested I''d post this to the mailing list, as it
may be a bug in
> IronRuby:
> 
> It seems impossible to call a constructor when there is a static .New()
> method defined on a class.
> 
> This is a minimal test case demonstrating the problem:
> 
> .NET (C#) class:
> 
>     public class Tester
>     {
>         public static void New()
>         {
>             Console.WriteLine("In Tester.New()");
>         }
> 
>         public Tester()
>         {
>             Console.WriteLine("In constructor");
>         }
>     }
> 
> IronRuby code:
> 
>     Tester.new
>     Tester.New
> 
> The ruby code above calls Tester.New() in both cases. There seems to be no
> way to call the regular constructor of this class.
> 
> _______________________________________________
> Ironruby-core mailing list
> Ironruby-core at rubyforge.org
> http://rubyforge.org/mailman/listinfo/ironruby-core
> 
> _______________________________________________
> Ironruby-core mailing list
> Ironruby-core at rubyforge.org
> http://rubyforge.org/mailman/listinfo/ironruby-core
> _______________________________________________
> Ironruby-core mailing list
> Ironruby-core at rubyforge.org
> http://rubyforge.org/mailman/listinfo/ironruby-core

Jimmy Schementi

2010-Jun-29 19:42 UTC

head link

[Ironruby-core] Calling constructor when static .New() method is defined

I said "#new" in some places where I shouldn''t have ... so
corrected below in case there was some confusion ...
 > -----Original Message-----
> From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-
> bounces at rubyforge.org] On Behalf Of Jimmy Schementi
> Sent: Tuesday, June 29, 2010 11:59 AM
> To: ironruby-core at rubyforge.org
> Subject: Re: [Ironruby-core] Calling constructor when static .New() method
is
> defined
> 
> Philippe Leybaert wrote:
> > But I personally think this behavior is completely wrong. Calling .new
from
> > IronRuby should always call the constructor, not a static method named
> > .New() that happens to exist somewhere in the class hierarchy. (if the
> > .New() method is defined in a base class, you get the same problem).
> 
> "new" is just a Ruby method on the Class object, which Ruby
happens to call
> to construct an object. Because it''s just a method, it can be
overridden. For
> example, a Ruby class''s .new can be overridden to return ANY
object.
> 
> >>> class Foo
> ...   def self.new
> ...     42
> ...   end
> ... end
> => nil
> >>> Foo.new
> => 42
> >>> Foo.new.class
> => Fixnum
> >>>
> 
> So, anywhere in the class hierarchy, .new can be overridden. For example,
if
> a base class overrides new, it does so for all its subclasses also, just as
normal
> inheritance tells it to:
> 
> >>> class Bar < Foo
> ... end
> => nil
> >>> Bar.new
> => 42
> 
> At a high-level, the way IronRuby''s .NET interop works is by
treating any
> .NET-based code as if it were Ruby code, so a CLR Type will be shown as a
> Ruby Class. Therefore, defining a "New" method in C# is the moral
> equivalent of defining "new" on any Ruby class, which will
override
> Class#new, which in turn overrides the CLR .ctor. Which is why
"clr_new" is
> provided.
> 
> ~js
> 
> > -----Original Message-----
> > From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-
> > bounces at rubyforge.org] On Behalf Of Tomas Matousek
> > Sent: dinsdag 29 juni 2010 19:24
> > To: ironruby-core at rubyforge.org
> > Subject: Re: [Ironruby-core] Calling constructor when static .New()
method
> is
> > defined
> >
> > You can call CLR constructor using "clr_new" method:
> >
> > Tester.clr_new
> >
> > Tomas
> >
> > -----Original Message-----
> > From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-
> > bounces at rubyforge.org] On Behalf Of Philippe Leybaert
> > Sent: Tuesday, June 29, 2010 9:57 AM
> > To: ironruby-core at rubyforge.org
> > Subject: [Ironruby-core] Calling constructor when static .New() method
is
> > defined
> >
> > Shay Friedman suggested I''d post this to the mailing list, as
it may be a bug
> in
> > IronRuby:
> >
> > It seems impossible to call a constructor when there is a static
.New()
> > method defined on a class.
> >
> > This is a minimal test case demonstrating the problem:
> >
> > .NET (C#) class:
> >
> >     public class Tester
> >     {
> >         public static void New()
> >         {
> >             Console.WriteLine("In Tester.New()");
> >         }
> >
> >         public Tester()
> >         {
> >             Console.WriteLine("In constructor");
> >         }
> >     }
> >
> > IronRuby code:
> >
> >     Tester.new
> >     Tester.New
> >
> > The ruby code above calls Tester.New() in both cases. There seems to
be
> no
> > way to call the regular constructor of this class.
> >
> > _______________________________________________
> > Ironruby-core mailing list
> > Ironruby-core at rubyforge.org
> > http://rubyforge.org/mailman/listinfo/ironruby-core
> >
> > _______________________________________________
> > Ironruby-core mailing list
> > Ironruby-core at rubyforge.org
> > http://rubyforge.org/mailman/listinfo/ironruby-core
> > _______________________________________________
> > Ironruby-core mailing list
> > Ironruby-core at rubyforge.org
> > http://rubyforge.org/mailman/listinfo/ironruby-core
> 
> _______________________________________________
> Ironruby-core mailing list
> Ironruby-core at rubyforge.org
> http://rubyforge.org/mailman/listinfo/ironruby-core

Ironruby core - Jun 2010 - Calling constructor when static .New() method is defined

[Ironruby-core] Calling constructor when static .New() method is defined

[Ironruby-core] Calling constructor when static .New() method is defined

[Ironruby-core] Calling constructor when static .New() method is defined

[Ironruby-core] Calling constructor when static .New() method is defined

[Ironruby-core] Calling constructor when static .New() method is defined