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+
+-- Copyright (C) 2002 Morgan Kaufmann Publishers, Inc
+
+-- This file is part of VESTs (Vhdl tESTs).
+
+-- VESTs is free software; you can redistribute it and/or modify it
+-- under the terms of the GNU General Public License as published by the
+-- Free Software Foundation; either version 2 of the License, or (at
+-- your option) any later version. 
+
+-- VESTs is distributed in the hope that it will be useful, but WITHOUT
+-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+-- FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+-- for more details. 
+
+-- You should have received a copy of the GNU General Public License
+-- along with VESTs; if not, write to the Free Software Foundation,
+-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+
+package function_plus is
+
+  -- code from book (in text)
+
+  function "+" ( bv1, bv2 : bit_vector ) return bit_vector;
+
+  -- end code from book
+
+end package function_plus;
+
+
+
+package body function_plus is
+
+  -- code from book
+
+  function "+" ( bv1, bv2 : bit_vector ) return bit_vector is
+
+    alias norm1 : bit_vector(1 to bv1'length) is bv1;
+    alias norm2 : bit_vector(1 to bv2'length) is bv2;
+
+    variable result : bit_vector(1 to bv1'length);
+    variable carry : bit := '0';
+
+  begin
+    if bv1'length /= bv2'length then
+      report "arguments of different length" severity failure;
+    else
+      for index in norm1'reverse_range loop
+        result(index) := norm1(index) xor norm2(index) xor carry;
+        carry := ( norm1(index) and norm2(index) )
+              or ( carry and ( norm1(index) or norm2(index) ) );
+      end loop;
+    end if;
+    return result;
+  end function "+";
+
+  -- end code from book
+
+end package body function_plus;