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+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2005-2013. 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/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// This code comes from N1953 document by Howard E. Hinnant
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+#ifndef BOOST_CONTAINER_DETAIL_VERSION_TYPE_HPP
+#define BOOST_CONTAINER_DETAIL_VERSION_TYPE_HPP
+
+#ifndef BOOST_CONFIG_HPP
+# include <boost/config.hpp>
+#endif
+
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+# pragma once
+#endif
+
+#include <boost/container/detail/config_begin.hpp>
+#include <boost/container/detail/workaround.hpp>
+
+#include <boost/container/detail/mpl.hpp>
+#include <boost/container/detail/type_traits.hpp>
+
+namespace boost{
+namespace container {
+namespace dtl {
+
+template <class T, unsigned V>
+struct version_type
+ : public dtl::integral_constant<unsigned, V>
+{
+ typedef T type;
+};
+
+namespace impl{
+
+template <class T>
+struct extract_version
+ : T::version
+{};
+
+template <class T>
+struct has_version
+{
+ private:
+ struct two {char _[2];};
+ template <class U> static two test(...);
+ template <class U> static char test(const typename U::version*);
+ public:
+ static const bool value = sizeof(test<T>(0)) == 1;
+ void dummy(){}
+};
+
+template <class T, bool = has_version<T>::value>
+struct version
+{
+ static const unsigned value = 1;
+};
+
+template <class T>
+struct version<T, true>
+{
+ static const unsigned value = extract_version<T>::value;
+};
+
+} //namespace impl
+
+template <class T>
+struct version
+ : public dtl::integral_constant<unsigned, impl::version<T>::value>
+{};
+
+template<class T, unsigned N>
+struct is_version
+{
+ static const bool value =
+ is_same< typename version<T>::type, integral_constant<unsigned, N> >::value;
+};
+
+} //namespace dtl {
+
+typedef dtl::integral_constant<unsigned, 0> version_0;
+typedef dtl::integral_constant<unsigned, 1> version_1;
+typedef dtl::integral_constant<unsigned, 2> version_2;
+
+} //namespace container {
+} //namespace boost{
+
+#include <boost/container/detail/config_end.hpp>
+
+#endif //#define BOOST_CONTAINER_DETAIL_VERSION_TYPE_HPP