From: matz@... (Yukihiro Matsumoto)
Date: 2002-03-14T23:18:51+09:00
Subject: Re: how do i: add_observer( { small bit of code } )

Hi,

In message "Re: how do i: add_observer( { small bit of code } )"
    on 02/03/14, mrp@cre.canon.co.uk <mrp@cre.canon.co.uk> writes:

|more context required from me!  i'm using the observer mixin.  putting
|update() methods in observers is fine for 'normal' code,  but when
|writing unit tests etc.  i want to use small bits of code like:
|    x.add_observer({ count += 1 }) 
|
|up until now i've used a small Wrapper class (brief desc above).  i'm now
|wondering if there's a better way of doing this.  any ideas?

I guess a wrapper is the best solution, or you can define a "functional
wrapper" like this:

  def proc_observer(&block)
    def block.update(*args)
       block.call(*args)
    end
    block
  end

then

  x.add_observer(proc_observer{count += 1})

							matz.