From: James French <James.French@...>
Date: 2009-11-06T22:50:30+09:00
Subject: encapsulation issue

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Hi,

Is there any way of providing read only access to an array? (problem shown =
by code below).

class A

  def initialize
    @dependencies =3D []
  end

  # intended to be read only access
  def dependencies
    @dependencies
  end

  def addDependency(d)
    @dependencies << d
    puts "adding #{d}"
  end
end


a =3D A.new
a.addDependency("foo")
a.dependencies << "bar" # encapsulation subverted

puts a.dependencies   # foo and bar both in array


Any suggestions appreciated,
James


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