Chris@16: //  (C) Copyright John Maddock 2005.
Chris@16: //  Use, modification and distribution are subject to the
Chris@16: //  Boost Software License, Version 1.0. (See accompanying file
Chris@16: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_TR1_UTILITY_HPP_INCLUDED
Chris@16: #  define BOOST_TR1_UTILITY_HPP_INCLUDED
Chris@16: #  include <boost/tr1/detail/config.hpp>
Chris@16: 
Chris@16: #ifdef BOOST_HAS_TR1_UTILITY
Chris@16: 
Chris@16: #  if defined(BOOST_HAS_INCLUDE_NEXT) && !defined(BOOST_TR1_DISABLE_INCLUDE_NEXT)
Chris@16: #     include_next BOOST_TR1_HEADER(utility)
Chris@16: #  else
Chris@16: #     include <boost/tr1/detail/config_all.hpp>
Chris@16: #     include BOOST_TR1_STD_HEADER(BOOST_TR1_PATH(utility))
Chris@16: #  endif
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16: #if defined(BOOST_TR1_USE_OLD_TUPLE)
Chris@16: 
Chris@16: #include <boost/type_traits/integral_constant.hpp>
Chris@16: #include <boost/type_traits/add_const.hpp>
Chris@16: #include <boost/type_traits/add_reference.hpp>
Chris@16: #include <boost/mpl/if.hpp>
Chris@16: 
Chris@16: 
Chris@16: namespace std{ namespace tr1{
Chris@16: 
Chris@16: template <class T> struct tuple_size; // forward declaration
Chris@16: template < int I, class T> struct tuple_element; // forward declaration
Chris@16: 
Chris@16: template <class T1, class T2> 
Chris@16: struct tuple_size< ::std::pair<T1, T2> >
Chris@16:    : public ::boost::integral_constant< ::std::size_t, 2>
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: template <class T1, class T2> 
Chris@16: struct tuple_element<0, ::std::pair<T1, T2> >
Chris@16: {
Chris@16:    typedef typename std::pair<T1, T2>::first_type type;
Chris@16: };
Chris@16: 
Chris@16: template <class T1, class T2> 
Chris@16: struct tuple_element<1, std::pair<T1, T2> >
Chris@16: {
Chris@16:    typedef typename std::pair<T1, T2>::second_type type;
Chris@16: };
Chris@16: 
Chris@16: namespace tuple_detail{
Chris@16:    template <int I, class T1, class T2>
Chris@16:    struct tuple_get_result
Chris@16:    {
Chris@16:       typedef typename boost::mpl::if_c<I==0, T1, T2>::type t1;
Chris@16:       typedef typename boost::add_reference<t1>::type type;
Chris@16:    };
Chris@16:    template <int I, class T1, class T2>
Chris@16:    struct const_tuple_get_result
Chris@16:    {
Chris@16:       typedef typename boost::mpl::if_c<I==0, T1, T2>::type t1;
Chris@16: # if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x582))
Chris@16:       // I have absolutely no idea why add_const is not working here for Borland!
Chris@16:       // It passes all other free-standing tests, some strange interaction going on
Chris@16:       typedef typename boost::add_reference< const t1 >::type type;
Chris@16: # else
Chris@16:       typedef typename boost::add_const<t1>::type t2;
Chris@16:       typedef typename boost::add_reference<t2>::type type;
Chris@16: # endif
Chris@16:    };
Chris@16: 
Chris@16: template<int I, class T1, class T2> 
Chris@16: inline typename tuple_detail::tuple_get_result<I,T1,T2>::type get(std::pair<T1, T2>& p, const ::boost::true_type&)
Chris@16: {
Chris@16:    return p.first;
Chris@16: }
Chris@16: 
Chris@16: template<int I, class T1, class T2> 
Chris@16: inline typename tuple_detail::const_tuple_get_result<I,T1,T2>::type get(const std::pair<T1, T2>& p, const ::boost::true_type&)
Chris@16: {
Chris@16:    return p.first;
Chris@16: }
Chris@16: 
Chris@16: template<int I, class T1, class T2> 
Chris@16: inline typename tuple_detail::tuple_get_result<I,T1,T2>::type get(std::pair<T1, T2>& p, const ::boost::false_type&)
Chris@16: {
Chris@16:    return p.second;
Chris@16: }
Chris@16: 
Chris@16: template<int I, class T1, class T2> 
Chris@16: inline typename tuple_detail::const_tuple_get_result<I,T1,T2>::type get(const std::pair<T1, T2>& p, const ::boost::false_type&)
Chris@16: {
Chris@16:    return p.second;
Chris@16: }
Chris@16: 
Chris@16: }
Chris@16: 
Chris@16: template<int I, class T1, class T2> 
Chris@16: inline typename tuple_detail::tuple_get_result<I,T1,T2>::type get(std::pair<T1, T2>& p)
Chris@16: {
Chris@16:    return tuple_detail::get<I>(p, boost::integral_constant<bool, I==0>());
Chris@16: }
Chris@16: 
Chris@16: template<int I, class T1, class T2> 
Chris@16: inline typename tuple_detail::const_tuple_get_result<I,T1,T2>::type get(const std::pair<T1, T2>& p)
Chris@16: {
Chris@16:    return tuple_detail::get<I>(p, boost::integral_constant<bool, I==0>());
Chris@16: }
Chris@16: 
Chris@16: } } // namespaces
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16: #include <boost/tr1/tuple.hpp>
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: #endif