root/lang/ruby/CPU-Z80/trunk/lib/CPU/Z80/register16.rb @ 4473

# $Id$

require 'CPU/Z80/register8'

module CPU
  module Z80
    class Register16
      MASK16 = 0xFFFF

      def value
        @high.value << 8 | @low.value
      end

      def value=(v)
        @high.value = v >> 8
        @low.value = v
      end

      def high; @high.value; end
      def low;  @low.value;  end

      def high=(v)
        @high.value = v
      end

      def low=(v)
        @low.value = v
      end

      # e.g. @hl = Register.new(:h, :l)
      #
      def initialize(names=nil, v=nil)
        if names
          high_name, low_name = names[0,2]
          eval <<-END_OF_DEFINITION
            def self.#{high_name}; self.high; end
            def self.#{low_name}; self.low; end
            def self.#{high_name}=(v); self.high = v; end
            def self.#{low_name}=(v); self.low = v; end
          END_OF_DEFINITION
        end
        @high = Register8.new
        @low = Register8.new
        self.value = v || 0
      end
    end
  end
end

# Local Variables:
# coding: utf-8
# mode: ruby
# ruby-indent-level: 2
# ruby-indent-tabs-mode: nil
# End: