//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2013. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/container for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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//
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// This code comes from N1953 document by Howard E. Hinnant
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_CONTAINER_DETAIL_VERSION_TYPE_HPP
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#define BOOST_CONTAINER_DETAIL_VERSION_TYPE_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/container/detail/config_begin.hpp>
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#include <boost/container/detail/workaround.hpp>
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#include <boost/container/detail/mpl.hpp>
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#include <boost/container/detail/type_traits.hpp>
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namespace boost{
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namespace container {
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namespace dtl {
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template <class T, unsigned V>
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struct version_type
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: public dtl::integral_constant<unsigned, V>
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{
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typedef T type;
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};
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namespace impl{
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template <class T>
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struct extract_version
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{
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typedef typename T::version type;
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};
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template <class T>
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struct has_version
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{
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private:
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struct two {char _[2];};
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template <class U> static two test(...);
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template <class U> static char test(const typename U::version*);
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public:
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static const bool value = sizeof(test<T>(0)) == 1;
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void dummy(){}
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};
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template <class T, bool = has_version<T>::value>
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struct version
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{
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static const unsigned value = 1;
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};
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template <class T>
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struct version<T, true>
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{
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static const unsigned value = extract_version<T>::type::value;
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};
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} //namespace impl
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template <class T>
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struct version
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: public dtl::integral_constant<unsigned, impl::version<T>::value>
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{};
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template<class T, unsigned N>
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struct is_version
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{
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static const bool value =
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is_same< typename version<T>::type, integral_constant<unsigned, N> >::value;
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};
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} //namespace dtl {
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typedef dtl::integral_constant<unsigned, 0> version_0;
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typedef dtl::integral_constant<unsigned, 1> version_1;
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typedef dtl::integral_constant<unsigned, 2> version_2;
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} //namespace container {
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} //namespace boost{
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#include <boost/container/detail/config_end.hpp>
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#endif //#define BOOST_CONTAINER_DETAIL_VERSION_TYPE_HPP
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