Add adder device

Gemfile

@@ -1,2 +1,3 @@
 source "https://rubygems.org"
 gem "yard"
+gem "pry"

Gemfile.lock

@@ -1,12 +1,18 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    coderay (1.1.2)
+    method_source (0.9.0)
+    pry (0.11.3)
+      coderay (~> 1.1.0)
+      method_source (~> 0.9.0)
     yard (0.9.14)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
+  pry
   yard
 
 BUNDLED WITH

console

@@ -0,0 +1,6 @@
+#!/usr/bin/env ruby
+require "pry"
+require_relative "lib/rcircuit.rb"
+a=Port.new(8)
+b=Port.new(8)
+Pry.start()

lib/rcircuit.rb

@@ -5,3 +5,4 @@ require_relative "rcircuit/not.rb"
 require_relative "rcircuit/and.rb"
 require_relative "rcircuit/or.rb"
 require_relative "rcircuit/xor.rb"
+require_relative "rcircuit/adder.rb"

lib/rcircuit/adder.rb

@@ -0,0 +1,13 @@
+class Adder < Device
+  def initialize(width, init_args)
+    add_input("a", width)
+    add_input("b", width)
+    add_output("out", width)
+    init_assign(init_args)
+    @mask=(2**width)-1
+  end
+
+  def on_change(data_val)
+    out.setval((a.val+b.val)&@mask)
+  end
+end

lib/rcircuit/device.rb

@@ -5,7 +5,6 @@ class Device
   # @param width [Integer] Width of the port
   # @return [void]
   def add_input(name, width=1)
-    self.class.class_eval{attr_reader name.to_sym}
     port = Port.new(width)
     instance_variable_set("@#{name}", port)
     port.add_callback { |val| on_change(val) }
@@ -38,7 +37,7 @@ class Device
     hash.each do |name, port|
       #check if there is a defined method (port) that matches
       if self.respond_to?(name)
-        method(name).call(port)
+        instance_variable_get("@#{name}").connect(port)
       else
         raise ArgumentError, "No defined input '#{name}'"
       end