sl@0: //  (C) Copyright John Maddock 2005.
sl@0: //  Use, modification and distribution are subject to the
sl@0: //  Boost Software License, Version 1.0. (See accompanying file
sl@0: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
sl@0: 
sl@0: #ifndef BOOST_TR1_UTILITY_HPP_INCLUDED
sl@0: #  define BOOST_TR1_UTILITY_HPP_INCLUDED
sl@0: #  include <boost/tr1/detail/config.hpp>
sl@0: 
sl@0: #ifdef BOOST_HAS_TR1_UTILITY
sl@0: 
sl@0: #  ifdef BOOST_HAS_INCLUDE_NEXT
sl@0: #     include_next BOOST_TR1_HEADER(utility)
sl@0: #  else
sl@0: #     include BOOST_TR1_STD_HEADER(BOOST_TR1_PATH(utility))
sl@0: #  endif
sl@0: 
sl@0: #else
sl@0: 
sl@0: #if defined(BOOST_TR1_USE_OLD_TUPLE)
sl@0: 
sl@0: #include <boost/type_traits/integral_constant.hpp>
sl@0: #include <boost/type_traits/add_const.hpp>
sl@0: #include <boost/type_traits/add_reference.hpp>
sl@0: #include <boost/mpl/if.hpp>
sl@0: 
sl@0: 
sl@0: namespace std{ namespace tr1{
sl@0: 
sl@0: template <class T> struct tuple_size; // forward declaration
sl@0: template < int I, class T> struct tuple_element; // forward declaration
sl@0: 
sl@0: #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
sl@0: template <class T1, class T2>
sl@0: struct tuple_size< ::std::pair<T1, T2> >
sl@0:    : public ::boost::integral_constant< ::std::size_t, 2>
sl@0: {
sl@0: };
sl@0: 
sl@0: template <class T1, class T2>
sl@0: struct tuple_element<0, ::std::pair<T1, T2> >
sl@0: {
sl@0:    typedef typename std::pair<T1, T2>::first_type type;
sl@0: };
sl@0: 
sl@0: template <class T1, class T2>
sl@0: struct tuple_element<1, std::pair<T1, T2> >
sl@0: {
sl@0:    typedef typename std::pair<T1, T2>::second_type type;
sl@0: };
sl@0: #endif
sl@0: 
sl@0: namespace tuple_detail{
sl@0:    template <int I, class T1, class T2>
sl@0:    struct tuple_get_result
sl@0:    {
sl@0:       typedef typename boost::mpl::if_c<I==0, T1, T2>::type t1;
sl@0:       typedef typename boost::add_reference<t1>::type type;
sl@0:    };
sl@0:    template <int I, class T1, class T2>
sl@0:    struct const_tuple_get_result
sl@0:    {
sl@0:       typedef typename boost::mpl::if_c<I==0, T1, T2>::type t1;
sl@0: # if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x582))
sl@0:       // I have absolutely no idea why add_const is not working here for Borland!
sl@0:       // It passes all other free-standing tests, some strange interaction going on
sl@0:       typedef typename boost::add_reference< const t1 >::type type;
sl@0: # else
sl@0:       typedef typename boost::add_const<t1>::type t2;
sl@0:       typedef typename boost::add_reference<t2>::type type;
sl@0: # endif
sl@0:    };
sl@0: 
sl@0: template<int I, class T1, class T2>
sl@0: inline typename tuple_detail::tuple_get_result<I,T1,T2>::type get(std::pair<T1, T2>& p, const ::boost::true_type&)
sl@0: {
sl@0:    return p.first;
sl@0: }
sl@0: 
sl@0: template<int I, class T1, class T2>
sl@0: inline typename tuple_detail::const_tuple_get_result<I,T1,T2>::type get(const std::pair<T1, T2>& p, const ::boost::true_type&)
sl@0: {
sl@0:    return p.first;
sl@0: }
sl@0: 
sl@0: template<int I, class T1, class T2>
sl@0: inline typename tuple_detail::tuple_get_result<I,T1,T2>::type get(std::pair<T1, T2>& p, const ::boost::false_type&)
sl@0: {
sl@0:    return p.second;
sl@0: }
sl@0: 
sl@0: template<int I, class T1, class T2>
sl@0: inline typename tuple_detail::const_tuple_get_result<I,T1,T2>::type get(const std::pair<T1, T2>& p, const ::boost::false_type&)
sl@0: {
sl@0:    return p.second;
sl@0: }
sl@0: 
sl@0: }
sl@0: 
sl@0: template<int I, class T1, class T2> 
sl@0: inline typename tuple_detail::tuple_get_result<I,T1,T2>::type get(std::pair<T1, T2>& p)
sl@0: {
sl@0:    return tuple_detail::get<I>(p, boost::integral_constant<bool, I==0>());
sl@0: }
sl@0: 
sl@0: template<int I, class T1, class T2> 
sl@0: inline typename tuple_detail::const_tuple_get_result<I,T1,T2>::type get(const std::pair<T1, T2>& p)
sl@0: {
sl@0:    return tuple_detail::get<I>(p, boost::integral_constant<bool, I==0>());
sl@0: }
sl@0: 
sl@0: } } // namespaces
sl@0: 
sl@0: #else
sl@0: 
sl@0: #include <boost/tr1/tuple.hpp>
sl@0: 
sl@0: #endif
sl@0: 
sl@0: #endif
sl@0: 
sl@0: #endif