From: ts <decoux@...>
Date: 2002-10-15T00:51:35+09:00
Subject: Re: final in ruby

>>>>> "K" == Kontra, Gergely <kgergely@mlabdial.hit.bme.hu> writes:

K> Will ruby some day support some kind of predicate or modifier, so I can
K> protect my method beeing overwritten?

 Why do you want this, this can be usefull to modify a method. Imagine that
 someone write a stupid module like this :

pigeon% cat b.rb
#!/usr/bin/ruby
require 'mwrap'

Array.mwrap(:push, :stop) do |args|
   if args == 12
      raise ArgumentError, "12 is not valid", []
   end
   next_mwrapper 12
end

a = []
4.times {|i| a.push i }
p a
begin
   a.push 12
rescue
   p $!
end

Array.munwrap :push
a.push 6
p a
pigeon% 

pigeon% b.rb
[12, 12, 12, 12]
#<ArgumentError: 12 is not valid>
[12, 12, 12, 12, 6]
pigeon% 

 this can be usefull :-)


Guy Decoux