diff --git a/lemon/bits/utility.h b/lemon/bits/utility.h
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+/* -*- C++ -*-
+ *
+ * This file is a part of LEMON, a generic C++ optimization library
+ *
+ * Copyright (C) 2003-2007
+ * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+ * (Egervary Research Group on Combinatorial Optimization, EGRES).
+ *
+ * Permission to use, modify and distribute this software is granted
+ * provided that this copyright notice appears in all copies. For
+ * precise terms see the accompanying LICENSE file.
+ *
+ * This software is provided "AS IS" with no warranty of any kind,
+ * express or implied, and with no claim as to its suitability for any
+ * purpose.
+ *
+ */
+
+// This file contains a modified version of the enable_if library from BOOST.
+// See the appropriate copyright notice below.
+
+// Boost enable_if library
+
+// Copyright 2003 © The Trustees of Indiana University.
+
+// Use, modification, and distribution is subject to the Boost Software
+// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+//    Authors: Jaakko Järvi (jajarvi at osl.iu.edu)
+//             Jeremiah Willcock (jewillco at osl.iu.edu)
+//             Andrew Lumsdaine (lums at osl.iu.edu)
+
+
+#ifndef LEMON_BITS_UTILITY_H
+#define LEMON_BITS_UTILITY_H
+
+///\file
+///\brief Miscellaneous basic utilities
+///
+///\todo Please rethink the organisation of the basic files like this.
+///E.g. this file might be merged with invalid.h.
+
+
+namespace lemon
+{
+
+  /// Basic type for defining "tags". A "YES" condition for \c enable_if.
+
+  /// Basic type for defining "tags". A "YES" condition for \c enable_if.
+  ///
+  ///\sa False
+  ///
+  /// \todo This should go to a separate "basic_types.h" (or something)
+  /// file.
+  struct True {
+    ///\e
+    static const bool value = true;
+  };
+
+  /// Basic type for defining "tags". A "NO" condition for \c enable_if.
+
+  /// Basic type for defining "tags". A "NO" condition for \c enable_if.
+  ///
+  ///\sa True
+  struct False {
+    ///\e
+    static const bool value = false;
+  };
+
+
+  struct InvalidType {
+  };
+
+  template <typename T>
+  struct Wrap {
+    const T &value;
+    Wrap(const T &t) : value(t) {}
+  };
+
+  /**************** dummy class to avoid ambiguity ****************/
+
+  template<int T> struct dummy { dummy(int) {} };
+
+  /**************** enable_if from BOOST ****************/
+  
+  template <typename Type, typename T = void>
+  struct exists {
+    typedef T type;
+  };
+
+ 
+  template <bool B, class T = void>
+  struct enable_if_c {
+    typedef T type;
+  };
+
+  template <class T>
+  struct enable_if_c<false, T> {};
+
+  template <class Cond, class T = void> 
+  struct enable_if : public enable_if_c<Cond::value, T> {};
+
+  template <bool B, class T>
+  struct lazy_enable_if_c {
+    typedef typename T::type type;
+  };
+
+  template <class T>
+  struct lazy_enable_if_c<false, T> {};
+
+  template <class Cond, class T> 
+  struct lazy_enable_if : public lazy_enable_if_c<Cond::value, T> {};
+
+
+  template <bool B, class T = void>
+  struct disable_if_c {
+    typedef T type;
+  };
+
+  template <class T>
+  struct disable_if_c<true, T> {};
+
+  template <class Cond, class T = void> 
+  struct disable_if : public disable_if_c<Cond::value, T> {};
+
+  template <bool B, class T>
+  struct lazy_disable_if_c {
+    typedef typename T::type type;
+  };
+
+  template <class T>
+  struct lazy_disable_if_c<true, T> {};
+
+  template <class Cond, class T> 
+  struct lazy_disable_if : public lazy_disable_if_c<Cond::value, T> {};
+
+} // namespace lemon
+
+#endif