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+//  (C) Copyright Gennadiy Rozental 2001.
+//  Distributed under 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/test for the library home page.
+//
+//!@file
+//! Input iterator facade
+// ***************************************************************************
+
+#ifndef BOOST_TEST_UTILS_INPUT_ITERATOR_FACADE_HPP
+#define BOOST_TEST_UTILS_INPUT_ITERATOR_FACADE_HPP
+
+// Boost
+#include <boost/iterator/iterator_facade.hpp>
+
+#include <boost/test/detail/suppress_warnings.hpp>
+
+//____________________________________________________________________________//
+
+namespace boost {
+namespace unit_test {
+namespace utils {
+
+// ************************************************************************** //
+// **************          input_iterator_core_access          ************** //
+// ************************************************************************** //
+
+class input_iterator_core_access
+{
+#if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
+public:
+#else
+    template <class I, class V, class R, class TC> friend class input_iterator_facade;
+#endif
+
+    template <class Facade>
+    static bool get( Facade& f )
+    {
+        return f.get();
+    }
+
+private:
+    // objects of this class are useless
+    input_iterator_core_access(); //undefined
+};
+
+// ************************************************************************** //
+// **************            input_iterator_facade             ************** //
+// ************************************************************************** //
+
+template<typename Derived,
+         typename ValueType,
+         typename Reference = ValueType const&,
+         typename Traversal = single_pass_traversal_tag>
+class input_iterator_facade : public iterator_facade<Derived,ValueType,Traversal,Reference>
+{
+public:
+    // Constructor
+    input_iterator_facade() : m_valid( false ), m_value() {}
+
+protected: // provide access to the Derived
+    void                init()
+    {
+        m_valid = true;
+        increment();
+    }
+
+    // Data members
+    mutable bool        m_valid;
+    ValueType           m_value;
+
+private:
+    friend class boost::iterator_core_access;
+
+    // iterator facade interface implementation
+    void                increment()
+    {
+        // we make post-end incrementation indefinetly safe
+        if( m_valid )
+            m_valid = input_iterator_core_access::get( *static_cast<Derived*>(this) );
+    }
+    Reference           dereference() const
+    {
+        return m_value;
+    }
+
+    // iterator facade interface implementation
+    bool                equal( input_iterator_facade const& rhs ) const
+    {
+        // two invalid iterator equals, inequal otherwise
+        return !m_valid && !rhs.m_valid;
+    }
+};
+
+} // namespace utils
+} // namespace unit_test
+} // namespace boost
+
+//____________________________________________________________________________//
+
+#include <boost/test/detail/enable_warnings.hpp>
+
+#endif // BOOST_TEST_UTILS_INPUT_ITERATOR_FACADE_HPP