From: Rassat Nicolas <nicolas.rassat@...>
Date: 2007-10-01T04:50:37+09:00
Subject: canonical Array#append to hang hook

I have a class which inherit from Array. I want to perform some task
each time something is append to an instance of this class. The problem
is: there are so many way to append something to an array. For example:

class Narray < Array
  alias_method :old_push, :push
  def push(*obj)
    p "pushing #{obj}"
    old_push(*obj)
  end
  alias_method :old_append, :<<
  def <<(obj)
    p "<<ing #{obj}"
    old_append(obj)
  end
  alias_method :old_bracket, :[]=
  def []=(i,l=0)
    p "[]=ing #{i}"
    old_bracket(i,l)
  end
  alias_method :old_add, :+
  def +(i)
    p "+ing #{i}"
    old_add(i)
  end
end

a = Narray.new
a.push(1)
a << 2
a[a.length] = 3
a = a + [4]
p a

I forgot Array#insert, Array#fill and probably other...

Is there any Array#append function that can hooked to perform task every
time something is append to a?

Any solution is welcome.

LarsTico

PS: sorry for my poor frenchy english, but I hope you understand me.
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