From: Hugh Sasse <hgs@...>
Date: 2005-11-17T00:11:45+09:00
Subject: Re: static variable; behaviour in ruby?

On Wed, 16 Nov 2005, Ara.T.Howard wrote:

> On Wed, 16 Nov 2005, Hugh Sasse wrote:
> 
> > Any idea how to create or simulate a static variable in ruby?
        [...]
> 
>   harp:~ > cat a.rb
>   def do_this_factory x, y, z, &block
>     state = rand  # do something with x, y, z
>     lambda{ block[x, y, z] if state < 0.42 }
>   end
> 
>   a = do_this_factory 'x','y','z' do |x,y,z| p [x,y,z] end
>   a.call
>   harp:~ > ruby a.rb
> 
>   harp:~ > ruby a.rb
>   ["x", "y", "z"]
        [etc]

Maybe something like 
    def my_method x, y, z, &block
      state = rand  # do something with x, y, z
      alias :old_my_method, :my_method
      define_method(:my_method)(x,y,z, &block)
        lambda{ block[x, y, z] if state < 0.42 }.call
      end
    end

might do the trick, then?  The state would get carried around with
the closure in subesequent calls to the same method?  Except having
sevaral calls in the same block would be treated the same as severl
calls to the same method, rather than the way sed treats
/this/,/that/{ statements}, each heing independent, runnin for each
line of the input.
> 
> 
> > Maybe there's another way to do this?
> 
> write it in assembler ;-)

:-)
> 
        Hugh