Imported from /home/lorry/working-area/delta_boost-tarball/boost_1_58_0.tar.bz2.HEADboost_1_58_0master

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diff --git a/libs/optional/test/testable_classes.hpp b/libs/optional/test/testable_classes.hpp
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+// Copyright (C) 2014 Andrzej Krzemienski.
+//
+// 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)
+//
+// See http://www.boost.org/libs/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  akrzemi1@gmail.com
+
+#ifndef BOOST_OPTIONAL_TEST_TESTABKE_CLASSES_AK_07JAN2015_HPP
+#define BOOST_OPTIONAL_TEST_TESTABKE_CLASSES_AK_07JAN2015_HPP
+
+struct ScopeGuard // no copy/move ctor/assign
+{
+  int val_;
+  explicit ScopeGuard(int v) : val_(v) {}
+  int& val() { return val_; }
+  const int& val() const { return val_; }
+  
+private:
+  ScopeGuard(ScopeGuard const&);
+  void operator=(ScopeGuard const&);
+};
+
+struct Abstract
+{
+  virtual int& val() = 0;
+  virtual const int& val() const = 0;
+  virtual ~Abstract() {}
+  Abstract(){}
+  
+private:
+  Abstract(Abstract const&);
+  void operator=(Abstract const&);
+};
+
+struct Impl : Abstract
+{
+  int val_;
+  Impl(int v) : val_(v) {}
+  int& val() { return val_; }
+  const int& val() const { return val_; }
+};
+
+template <typename T>
+struct concrete_type_of
+{
+  typedef T type;
+};
+
+template <>
+struct concrete_type_of<Abstract>
+{
+  typedef Impl type;
+};
+
+template <>
+struct concrete_type_of<const Abstract>
+{
+  typedef const Impl type;
+};
+
+template <typename T>
+struct has_arrow
+{
+  static const bool value = true;
+};
+
+template <>
+struct has_arrow<int>
+{
+  static const bool value = false;
+};
+
+int& val(int& i) { return i; }
+int& val(Abstract& a) { return a.val(); }
+int& val(ScopeGuard& g) { return g.val(); }
+
+const int& val(const int& i) { return i; }
+const int& val(const Abstract& a) { return a.val(); }
+const int& val(const ScopeGuard& g) { return g.val(); }
+
+bool operator==(const Abstract& l, const Abstract& r) { return l.val() == r.val(); }
+bool operator==(const ScopeGuard& l, const ScopeGuard& r) { return l.val() == r.val(); }
+
+bool operator<(const Abstract& l, const Abstract& r) { return l.val() < r.val(); }
+bool operator<(const ScopeGuard& l, const ScopeGuard& r) { return l.val() < r.val(); }
+
+#endif //BOOST_OPTIONAL_TEST_TESTABKE_CLASSES_AK_07JAN2015_HPP