// (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 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; }; 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