From: nobu.nokada@...
Date: 2004-07-16T15:57:35+09:00
Subject: Re: Do you want ":=" operator?

Hi,

At Fri, 16 Jul 2004 15:02:19 +0900,
Xiangyu  Yang wrote in [ruby-talk:106622]:
> It seems that I need more words to explain my CPU model. I'll show why
> it is *impossible* to impletement *register assignment* by "=".

Isn't this acceptable?

class CPU
> class Reg
> attr_accessor :value, :new_value, :data_enb
> 
> def initialize()
> @value=@new_value=0
> @data_enb=false
> end
> 
> def assign(data)
> @new_value = data
> @data_enb=true
> end
> 
> def update
> @value, @data_enb=@new_value, false if @data_enb
> end
> 
> end

  def initialize(regnum = 32)
    @regset = Array.new(regnum) {Reg.new}
  end
  def [](idx)
    (0...@regset.size) === idx or raise RangeError
    @regset[idx]
  end
  def []=(idx, data)
    (0...@regset.size) === idx or raise RangeError
    @regset[idx].assign(data)
  end
end

R = CPU.new

-- 
Nobu Nakada