Re: Proposal of a new operator for Method and Proc

On Nov 8, 2007 7:03 PM, Gonzalo Garramu=F1o <[e-mail]> wrot=
e:
> Jordi wrote:
> >
> > class Page
> >
> >  def initialize
> >    counter =3D Counter.new
> >    t=3DTimer.new
> >
> >    t.timeout -> counter.update
> >    counter.overrun -> show_error
> >
> >  end
> >
> > end
> >
>
> You probably want to learn more about ruby blocks, procs and variable
> scopes.  Here's a way to do what you want in a ruby way.
>
> class Timer
>     def callback(proc =3D nil, &block)
>         @proc =3D proc || block
>     end
>
> # protected  # but we make it public for this test
>     def timeout
>         @proc.call if @proc
>     end
> end
>
> class Page
>    def show_error
>    end
>
>    def initialize
>      @counter =3D 0
>      t =3D Timer.new
>
>      t.callback        { @counter +=3D 1  }
>      t.timeout
>
>      # or...
>      t.callback( method(:show_error) )
>      t.timeout
>    end
> end
>
> You also probably want to discuss this sort of stuff in ruby-talk until
> you are more familiar with ruby.
>


As I said I'm not familiar with the syntaxis (my classes may have
errors) but I am do familiar with the semantics (I think I pretty
understand "rubyism").

Your class have a number of problems comparing with my solution. It is
similar to the second solution I gave.

- You must add that special method callback everytime.  Of course you
can make an special class for that and use mixins ...
- You can only register one "signal" . My solution can have an
arbitrary number.
- You are adding a new method to every class


I would like to extend my proposal to disconnection:

t.timeout -> counter.update  to connect
I can't imagine a cool operator to mean disconnect (x is graphically
perfect though)


An alternative proposal, more Qt-like (see reference links in the
first email) and more verbose:

Method or Proc.connect (Method or Proc)
Method or Proc.disconnect (Method or Proc)

Or a connect and disconnect in Object but I would really won't like to
pollute it (Object has "send" method though, it is much like half of
what I need for the connection).