From: Groleo Marius <groleo@...>
Date: 2005-11-16T19:01:49+09:00
Subject: Re: Nested classes

On 11/16/05, Brian Schr�der <ruby.brian@gmail.com> wrote:
> On 16/11/05, Groleo Marius <groleo@gmail.com> wrote:
> > On 11/16/05, Brian Schr�der <ruby.brian@gmail.com> wrote:
> > >
> > > What problem do you want to solve?
> > >
> > > Is this maybe nearer to you goals:
> > >
> > > class A
> > >   class B
> > >     def fun_b
> > >       p "B"
> > >     end
> > >   end
> > > end
> > >
> > > A::B.new.fun_b
> > >
> > > cheers,
> > >
> > > Brian
> > >
> >
> > Consider the case when class B would have more member functions.
> > In your example I would have to create a new object for each call to a
> > B function.
> > OTOH, a solution that I dont like :) could be :
> >  class A
> >    class B
> >      def fun_b
> >        p "B"
> >      end
> >      def other_b
> >        p "_B"
> >      end
> >    end
> >  end
> > b = A::B.new
> > b.fun_b
> > b.other_b
> >
> > By the instantion of a new B object in the code from the first post,
> > and refering to it, I was searching to keep a hierarchy inside a
> > network protocol.
> > I couldn't find any hint on google though :(
> >
>
> Maybe you should look at the delegation pattern. That may be
> applicable here. But I have not yet understood your use case. Could
> you describe it in a bit more detail?

Sure.
Consider  a client script  that has to querry a server.
The server operate on users/domains of a running qmail.

So, I would have a class named Client, with the folowing members:
login( user, pass ) logins to the remote administration server
domain              an instantion of a domain class.

OTOH Domain class has X member functions:
add( domain_name)   adds a new domain
remove
update

So a scenario would look like:

c =Client.new     #creates a new Domain object
c.login( "foo", "bar" )
c.domain.add( "localdomain" )

Now , back to the code ,the attr_reader was the magic word from what
Pit posted .
Maybe you too observed, but why in ruby
this  attr_reader : b  is different from  attr_reader :b
                   ^space                             ^no space



--
Regards, Groleo!

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