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// (C) Copyright John Maddock 2005.
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// Use, modification and distribution are subject to the
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// Boost 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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#ifndef BOOST_TR1_UTILITY_HPP_INCLUDED
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# define BOOST_TR1_UTILITY_HPP_INCLUDED
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# include <boost/tr1/detail/config.hpp>
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#ifdef BOOST_HAS_TR1_UTILITY
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# ifdef BOOST_HAS_INCLUDE_NEXT
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# include_next BOOST_TR1_HEADER(utility)
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# else
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# include BOOST_TR1_STD_HEADER(BOOST_TR1_PATH(utility))
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# endif
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#else
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#if defined(BOOST_TR1_USE_OLD_TUPLE)
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#include <boost/type_traits/integral_constant.hpp>
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#include <boost/type_traits/add_const.hpp>
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#include <boost/type_traits/add_reference.hpp>
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#include <boost/mpl/if.hpp>
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namespace std{ namespace tr1{
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template <class T> struct tuple_size; // forward declaration
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template < int I, class T> struct tuple_element; // forward declaration
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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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template <class T1, class T2>
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struct tuple_size< ::std::pair<T1, T2> >
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: public ::boost::integral_constant< ::std::size_t, 2>
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{
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};
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template <class T1, class T2>
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struct tuple_element<0, ::std::pair<T1, T2> >
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{
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typedef typename std::pair<T1, T2>::first_type type;
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};
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template <class T1, class T2>
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struct tuple_element<1, std::pair<T1, T2> >
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{
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typedef typename std::pair<T1, T2>::second_type type;
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};
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#endif
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namespace tuple_detail{
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template <int I, class T1, class T2>
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struct tuple_get_result
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{
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typedef typename boost::mpl::if_c<I==0, T1, T2>::type t1;
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typedef typename boost::add_reference<t1>::type type;
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};
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template <int I, class T1, class T2>
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struct const_tuple_get_result
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{
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typedef typename boost::mpl::if_c<I==0, T1, T2>::type t1;
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# if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x582))
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// I have absolutely no idea why add_const is not working here for Borland!
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// It passes all other free-standing tests, some strange interaction going on
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typedef typename boost::add_reference< const t1 >::type type;
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# else
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typedef typename boost::add_const<t1>::type t2;
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typedef typename boost::add_reference<t2>::type type;
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# endif
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};
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template<int I, class T1, class T2>
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inline typename tuple_detail::tuple_get_result<I,T1,T2>::type get(std::pair<T1, T2>& p, const ::boost::true_type&)
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{
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return p.first;
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}
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template<int I, class T1, class T2>
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inline typename tuple_detail::const_tuple_get_result<I,T1,T2>::type get(const std::pair<T1, T2>& p, const ::boost::true_type&)
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{
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return p.first;
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}
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template<int I, class T1, class T2>
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inline typename tuple_detail::tuple_get_result<I,T1,T2>::type get(std::pair<T1, T2>& p, const ::boost::false_type&)
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{
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return p.second;
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}
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template<int I, class T1, class T2>
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inline typename tuple_detail::const_tuple_get_result<I,T1,T2>::type get(const std::pair<T1, T2>& p, const ::boost::false_type&)
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{
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return p.second;
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}
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}
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template<int I, class T1, class T2>
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inline typename tuple_detail::tuple_get_result<I,T1,T2>::type get(std::pair<T1, T2>& p)
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{
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return tuple_detail::get<I>(p, boost::integral_constant<bool, I==0>());
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}
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template<int I, class T1, class T2>
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inline typename tuple_detail::const_tuple_get_result<I,T1,T2>::type get(const std::pair<T1, T2>& p)
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{
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return tuple_detail::get<I>(p, boost::integral_constant<bool, I==0>());
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}
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} } // namespaces
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#else
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#include <boost/tr1/tuple.hpp>
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#endif
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#endif
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#endif
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