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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
- {
- typedef typename T::version type;
- };
- 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>::type::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
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