3rdparty/boost/boost/fusion/container/deque/detail/keyed_element.hpp

   1 /*=============================================================================
   2     Copyright (c) 2005-2012 Joel de Guzman
   3     Copyright (c) 2005-2006 Dan Marsden
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 ==============================================================================*/
   8 #if !defined(BOOST_FUSION_DEQUE_DETAIL_KEYED_ELEMENT_26112006_1330)
   9 #define BOOST_FUSION_DEQUE_DETAIL_KEYED_ELEMENT_26112006_1330
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/fusion/support/detail/access.hpp>
  13 #include <boost/fusion/iterator/deref.hpp>
  14 #include <boost/fusion/iterator/next.hpp>
  15
  16 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && BOOST_WORKAROUND(BOOST_GCC, / 100 == 404)
  17 #include <boost/core/enable_if.hpp>
  18 #include <boost/type_traits/is_same.hpp>
  19 #endif
  20
  21 namespace boost { namespace fusion
  22 {
  23     struct fusion_sequence_tag;
  24 }}
  25
  26 namespace boost { namespace fusion { namespace detail
  27 {
  28     struct nil_keyed_element
  29     {
  30         typedef fusion_sequence_tag tag;
  31         BOOST_FUSION_GPU_ENABLED
  32         void get();
  33
  34         template<typename It>
  35         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  36         static nil_keyed_element
  37         from_iterator(It const&)
  38         {
  39             return nil_keyed_element();
  40         }
  41     };
  42
  43     template <typename Key, typename Value, typename Rest>
  44     struct keyed_element : Rest
  45     {
  46         typedef Rest base;
  47         typedef fusion_sequence_tag tag;
  48         using Rest::get;
  49
  50         template <typename It>
  51         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  52         static keyed_element
  53         from_iterator(It const& it)
  54         {
  55             return keyed_element(
  56                 *it, base::from_iterator(fusion::next(it)));
  57         }
  58
  59         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  60         keyed_element(keyed_element const& rhs)
  61           : Rest(rhs.get_base()), value_(rhs.value_)
  62         {}
  63
  64 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
  65         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  66         keyed_element(keyed_element&& rhs)
  67           : Rest(rhs.forward_base())
  68           , value_(BOOST_FUSION_FWD_ELEM(Value, rhs.value_))
  69         {}
  70 #endif
  71
  72         template <typename U, typename Rst>
  73         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  74         keyed_element(keyed_element<Key, U, Rst> const& rhs
  75           , typename enable_if<is_convertible<U, Value> >::type* = 0)
  76           : Rest(rhs.get_base()), value_(rhs.value_)
  77         {}
  78
  79 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
  80 #endif
  81
  82         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  83         Rest& get_base() BOOST_NOEXCEPT
  84         {
  85             return *this;
  86         }
  87
  88         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  89         Rest const& get_base() const BOOST_NOEXCEPT
  90         {
  91             return *this;
  92         }
  93
  94 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
  95         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  96         Rest&& forward_base() BOOST_NOEXCEPT
  97         {
  98             return std::move(*static_cast<Rest*>(this));
  99         }
 100 #endif
 101
 102         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
 103         typename cref_result<Value>::type get(Key) const
 104         {
 105             return value_;
 106         }
 107
 108         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
 109         typename ref_result<Value>::type get(Key)
 110         {
 111             return value_;
 112         }
 113
 114         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
 115         keyed_element(
 116             typename detail::call_param<Value>::type value
 117           , Rest const& rest)
 118             : Rest(rest), value_(value)
 119         {}
 120
 121 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
 122 #if BOOST_WORKAROUND(BOOST_GCC, / 100 == 404)
 123         template <typename Value_, typename = typename enable_if<is_same<Value_, Value> >::type>
 124 #else
 125         typedef Value Value_;
 126 #endif
 127         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
 128         keyed_element(Value_&& value, Rest&& rest)
 129             : Rest(std::move(rest))
 130             , value_(BOOST_FUSION_FWD_ELEM(Value, value))
 131         {}
 132 #endif
 133
 134         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
 135         keyed_element()
 136             : Rest(), value_()
 137         {}
 138
 139         template<typename U, typename Rst>
 140         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
 141         keyed_element& operator=(keyed_element<Key, U, Rst> const& rhs)
 142         {
 143             base::operator=(static_cast<Rst const&>(rhs)); // cast for msvc-7.1
 144             value_ = rhs.value_;
 145             return *this;
 146         }
 147
 148         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
 149         keyed_element& operator=(keyed_element const& rhs)
 150         {
 151             base::operator=(rhs);
 152             value_ = rhs.value_;
 153             return *this;
 154         }
 155
 156 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
 157         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
 158         keyed_element& operator=(keyed_element&& rhs)
 159         {
 160             base::operator=(rhs.forward_base());
 161             value_ = std::move(rhs.value_);
 162             return *this;
 163         }
 164 #endif
 165
 166         Value value_;
 167     };
 168
 169     template<typename Elem, typename Key>
 170     struct keyed_element_value_at
 171       : keyed_element_value_at<typename Elem::base, Key>
 172     {};
 173
 174     template<typename Key, typename Value, typename Rest>
 175     struct keyed_element_value_at<keyed_element<Key, Value, Rest>, Key>
 176     {
 177         typedef Value type;
 178     };
 179 }}}
 180
 181 #endif