Chris@16: /*=============================================================================
Chris@16:     Copyright (c) 2001-2011 Joel de Guzman
Chris@16:     Copyright (c) 2006 Tobias Schwinger
Chris@16: 
Chris@16:     Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16:     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: ==============================================================================*/
Chris@16: #if !defined(FUSION_PAIR_07222005_1203)
Chris@16: #define FUSION_PAIR_07222005_1203
Chris@16: 
Chris@101: #include <boost/fusion/support/config.hpp>
Chris@16: #include <iosfwd>
Chris@16: 
Chris@16: #include <boost/fusion/support/detail/access.hpp>
Chris@16: #include <boost/fusion/support/detail/as_fusion_element.hpp>
Chris@16: #include <boost/config.hpp>
Chris@16: #include <boost/utility/enable_if.hpp>
Chris@16: #include <boost/type_traits/is_convertible.hpp>
Chris@101: #include <boost/type_traits/is_lvalue_reference.hpp>
Chris@16: 
Chris@16: #if defined (BOOST_MSVC)
Chris@16: #  pragma warning(push)
Chris@16: #  pragma warning (disable: 4512) // assignment operator could not be generated.
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost { namespace fusion
Chris@16: {
Chris@16:     // A half runtime pair where the first type does not have data
Chris@16:     template <typename First, typename Second>
Chris@16:     struct pair
Chris@16:     {
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         pair()
Chris@16:             : second() {}
Chris@16: 
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         pair(pair const& rhs)
Chris@16:             : second(rhs.second) {}
Chris@16: 
Chris@16: #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
Chris@101:         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         pair(pair&& rhs)
Chris@101:             : second(BOOST_FUSION_FWD_ELEM(Second, rhs.second)) {}
Chris@16: #endif
Chris@16: 
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         pair(typename detail::call_param<Second>::type val)
Chris@16:             : second(val) {}
Chris@16: 
Chris@16: #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
Chris@16:         template <typename Second2>
Chris@101:         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         pair(Second2&& val
Chris@101:           , typename boost::disable_if<is_lvalue_reference<Second2> >::type* /* dummy */ = 0
Chris@16:           , typename boost::enable_if<is_convertible<Second2, Second> >::type* /*dummy*/ = 0
Chris@101:         ) : second(BOOST_FUSION_FWD_ELEM(Second, val)) {}
Chris@16: #endif
Chris@16: 
Chris@16:         template <typename Second2>
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         pair(pair<First, Second2> const& rhs)
Chris@16:             : second(rhs.second) {}
Chris@16: 
Chris@16:         template <typename Second2>
Chris@101:         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         pair& operator=(pair<First, Second2> const& rhs)
Chris@16:         {
Chris@16:             second = rhs.second;
Chris@16:             return *this;
Chris@16:         }
Chris@16: 
Chris@101:         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         pair& operator=(pair const& rhs)
Chris@16:         {
Chris@16:             second = rhs.second;
Chris@16:             return *this;
Chris@16:         }
Chris@16: 
Chris@16: #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
Chris@101:         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         pair& operator=(pair&& rhs)
Chris@16:         {
Chris@101:             second = BOOST_FUSION_FWD_ELEM(Second, rhs.second);
Chris@16:             return *this;
Chris@16:         }
Chris@16: #endif
Chris@16: 
Chris@16:         typedef First first_type;
Chris@16:         typedef Second second_type;
Chris@16:         Second second;
Chris@16:     };
Chris@16: 
Chris@16:     namespace result_of
Chris@16:     {
Chris@16:         template<typename First, typename Second>
Chris@16:         struct make_pair
Chris@16:         {
Chris@16:             typedef fusion::pair<First,
Chris@16:                         typename detail::as_fusion_element<Second>::type> type;
Chris@16:         };
Chris@16: 
Chris@16:         template<class Pair>
Chris@16:         struct first
Chris@16:         {
Chris@16:             typedef typename Pair::first_type type;
Chris@16:         };
Chris@16: 
Chris@16:         template<class Pair>
Chris@16:         struct second
Chris@16:         {
Chris@16:             typedef typename Pair::second_type type;
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     template <typename First, typename Second>
Chris@101:     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:     inline typename result_of::make_pair<First,Second>::type
Chris@16:     make_pair(Second const& val)
Chris@16:     {
Chris@16:         return pair<First, typename detail::as_fusion_element<Second>::type>(val);
Chris@16:     }
Chris@16: 
Chris@16:     template <typename First, typename Second>
Chris@16:     inline std::ostream&
Chris@16:     operator<<(std::ostream& os, pair<First, Second> const& p)
Chris@16:     {
Chris@16:         os << p.second;
Chris@16:         return os;
Chris@16:     }
Chris@16: 
Chris@16:     template <typename First, typename Second>
Chris@16:     inline std::istream&
Chris@16:     operator>>(std::istream& is, pair<First, Second>& p)
Chris@16:     {
Chris@16:         is >> p.second;
Chris@16:         return is;
Chris@16:     }
Chris@16: 
Chris@16:     template <typename First, typename SecondL, typename SecondR>
Chris@101:     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:     inline bool
Chris@16:     operator==(pair<First, SecondL> const& l, pair<First, SecondR> const& r)
Chris@16:     {
Chris@16:         return l.second == r.second;
Chris@16:     }
Chris@16: 
Chris@16:     template <typename First, typename SecondL, typename SecondR>
Chris@101:     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:     inline bool
Chris@16:     operator!=(pair<First, SecondL> const& l, pair<First, SecondR> const& r)
Chris@16:     {
Chris@16:         return l.second != r.second;
Chris@16:     }
Chris@16: 
Chris@16:     template <typename First, typename SecondL, typename SecondR>
Chris@101:     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:     inline bool
Chris@16:     operator<(pair<First, SecondL> const& l, pair<First, SecondR> const& r)
Chris@16:     {
Chris@16:         return l.second < r.second;
Chris@16:     }
Chris@16: }}
Chris@16: 
Chris@16: #if defined (BOOST_MSVC)
Chris@16: #  pragma warning(pop)
Chris@16: #endif
Chris@16: 
Chris@16: #endif