diff --git a/myhdl/_instance.py b/myhdl/_instance.py
new file mode 100644
index 00000000..218dffdc
--- /dev/null
+++ b/myhdl/_instance.py
@@ -0,0 +1,45 @@
+#  This file is part of the myhdl library, a Python package for using
+#  Python as a Hardware Description Language.
+#
+#  Copyright (C) 2003 Jan Decaluwe
+#
+#  The myhdl library is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU Lesser General Public License as
+#  published by the Free Software Foundation; either version 2.1 of the
+#  License, or (at your option) any later version.
+#
+#  This library 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
+#  Lesser General Public License for more details.
+
+#  You should have received a copy of the GNU Lesser General Public
+#  License along with this library; if not, write to the Free Software
+#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+""" Module with the always function. """
+
+__author__ = "Jan Decaluwe <jan@jandecaluwe.com>"
+__revision__ = "$Revision$"
+__date__ = "$Date$"
+
+from types import FunctionType
+
+from myhdl import InstanceError
+from myhdl._util import _isGenFunc
+
+class _error:
+    pass
+_error.NrOfArgs = "decorated generator function should not have arguments"
+_error.ArgType = "decorated object should be a generator function"
+
+
+def instance(genFunc):
+    if not isinstance(genFunc, FunctionType):
+        raise InstanceError(_error.ArgType)
+    if not _isGenFunc(genFunc):
+        raise InstanceError(_error.ArgType)
+    if genFunc.func_code.co_argcount > 0:
+        raise InstanceError(_error.NrOfArgs)
+    return genFunc()
+
diff --git a/myhdl/_intbv.py b/myhdl/_intbv.py
index f7cc2baa..00d2609e 100644
--- a/myhdl/_intbv.py
+++ b/myhdl/_intbv.py
@@ -395,7 +395,7 @@ class intbv(object):
         return -self._val
 
     def __pos__(self):
-        return +self._val
+        return self._val
 
     def __abs__(self):
         return abs(self._val)