From: ts <decoux@...>
Date: 2000-08-07T14:54:51+02:00
Subject: [ruby-talk:04328] Re: TABWTDI and Hash.new([])

>>>>> "H" == Hugh Sasse Staff Elec Eng <hgs@dmu.ac.uk> writes:

H> I agree with those sentiments as well.  I wonder if this would be worth
H> extending more gnerally, so user-created classes can use it?

 Something like this ?

pigeon% cat b.rb
#!/usr/bin/ruby
class A
   def initialize
      @a = []
      @obj = if iterator?
                Proc.new
             else
                nil
             end
   end
   def add(*args)
      @a += if @obj &&  args.size == 0
               @obj.call
            else
               args
            end
   end
end
 
a = A.new {[1, 2] + 1}
a.add
p a
a.add [12, 24]
p a
 
pigeon% b.rb
#<A: @a=[1, 2, 1], @obj=#<Proc:0x401675d0>>
#<A: @a=[1, 2, 1, [12, 24]], @obj=#<Proc:0x401675d0>>
pigeon% 


Guy Decoux