From: Pedro Del Gallego <pedro.delgallego@...>
Date: 2007-09-17T03:06:41+09:00
Subject: Re: blocks expected arguments and metaprogramming

BTW, its works perfectly, with that i can decide what parameter return
in advances, (but, yet, I dont know is a good idea or not)

Thanks

module Kernel
  def before (name, &block)
    define_method(name) do
      if block.arity == 1
        yield :only_one
      elsif  block.arity == 2
        yield :one,:two
      elsif block.arity == -2
        yield :one, :a , :splater, :argument
      end
    end
  end
end

class A
  before :foo do |first|
    puts first
  end
end

a = A.new
a.foo

class A
  before :foo do |first , second|
    puts second
  end
end

a2 = A.new
a2.foo

class A
  before :foo do |first , *splat_arg|
    puts splat_arg
  end
end

a3 = A.new
a3.foo


2007/9/16, Pedro Del Gallego <pedro.delgallego@gmail.com>:
> >
> > On Sep 16, 8:10 am, "Pedro Del Gallego" <pedro.delgall...@gmail.com>
> > wrote:
> > > hi all,
> > >
> > > in this (http://pastie.caboo.se/97662) code :
> > >
> > > module Kernel
> > >   def expected_argument_list
> > >     2
> > >   end
> > >
> >    def before (name, &blk)
> >       puts :hola
> >       define_method(name){
> >         if blk.arity==1
> >          yield :only_one
> >         else
> >          yield :one,:two
> >         end
> >       }
> >    end
> >  end
> >
> > It's not quite as simple as that but that should be enough to move you
> > forward.
>
> Yes thats enough for me. I didnt now that the block was a Proc class.
>
> Thanks.
>
>
> --
> -------------------------------------
> Pedro Del Gallego
>
> Email              :   pedro.delgallego@gmail.com
>
>


-- 
-------------------------------------
Pedro Del Gallego

Email              :   pedro.delgallego@gmail.com