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