1 /*=============================================================================
2     Copyright (c) 2014-2015 Kohei Takahashi
3 
4     Distributed under the Boost Software License, Version 1.0. (See accompanying
5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 ==============================================================================*/
7 #ifndef FUSION_TUPLE_14122014_0102
8 #define FUSION_TUPLE_14122014_0102
9 
10 #include <boost/fusion/support/config.hpp>
11 #include <boost/fusion/tuple/tuple_fwd.hpp>
12 
13 ///////////////////////////////////////////////////////////////////////////////
14 // With no variadics, we will use the C++03 version
15 ///////////////////////////////////////////////////////////////////////////////
16 #if !defined(BOOST_FUSION_HAS_VARIADIC_TUPLE)
17 # include <boost/fusion/tuple/detail/tuple.hpp>
18 #else
19 
20 ///////////////////////////////////////////////////////////////////////////////
21 // C++11 interface
22 ///////////////////////////////////////////////////////////////////////////////
23 #include <boost/core/enable_if.hpp>
24 #include <boost/fusion/container/vector/vector.hpp>
25 #include <boost/fusion/sequence/intrinsic/size.hpp>
26 #include <boost/fusion/sequence/intrinsic/value_at.hpp>
27 #include <boost/fusion/sequence/intrinsic/at.hpp>
28 #include <boost/fusion/sequence/comparison.hpp>
29 #include <boost/fusion/sequence/io.hpp>
30 #include <boost/fusion/support/detail/and.hpp>
31 #include <boost/type_traits/is_convertible.hpp>
32 #include <utility>
33 
34 namespace boost { namespace fusion
35 {
36     template <typename ...T>
37     struct tuple
38         : vector_detail::vector_data<
39               typename detail::make_index_sequence<sizeof...(T)>::type
40             , T...
41           >
42     {
43         typedef vector_detail::vector_data<
44             typename detail::make_index_sequence<sizeof...(T)>::type
45           , T...
46         > base;
47 
48         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
tupleboost::fusion::tuple49         BOOST_DEFAULTED_FUNCTION(tuple(), {})
50 
51         template <
52             typename ...U
53           , typename = typename boost::enable_if_c<
54                 sizeof...(U) >= sizeof...(T)
55             >::type
56         >
57         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
58         tuple(tuple<U...> const& other)
59             : base(vector_detail::each_elem(), other) {}
60 
61         template <
62             typename ...U
63           , typename = typename boost::enable_if_c<
64                 sizeof...(U) >= sizeof...(T)
65             >::type
66         >
67         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
tupleboost::fusion::tuple68         tuple(tuple<U...>&& other)
69             : base(vector_detail::each_elem(), std::move(other)) {}
70 
71         template <
72             typename ...U
73           , typename = typename boost::enable_if_c<(
74                 fusion::detail::and_<is_convertible<U, T>...>::value &&
75                 sizeof...(U) >= 1
76             )>::type
77         >
78         /*BOOST_CONSTEXPR*/ BOOST_FUSION_GPU_ENABLED
79         explicit
tupleboost::fusion::tuple80         tuple(U&&... args)
81             : base(vector_detail::each_elem(), std::forward<U>(args)...) {}
82 
83         template<typename U1, typename U2>
84         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
tupleboost::fusion::tuple85         tuple(std::pair<U1, U2> const& other)
86             : base(vector_detail::each_elem(), other.first, other.second) {}
87 
88         template<typename U1, typename U2>
89         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
tupleboost::fusion::tuple90         tuple(std::pair<U1, U2>&& other)
91             : base(vector_detail::each_elem(), std::move(other.first), std::move(other.second)) {}
92 
93         template<typename U>
94         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
operator =boost::fusion::tuple95         tuple& operator=(U&& rhs)
96         {
97             base::assign_sequence(std::forward<U>(rhs));
98             return *this;
99         }
100     };
101 
102     template <typename Tuple>
103     struct tuple_size : result_of::size<Tuple> {};
104 
105     template <int N, typename Tuple>
106     struct tuple_element : result_of::value_at_c<Tuple, N> {};
107 
108     template <int N, typename Tuple>
109     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
110     inline typename result_of::at_c<Tuple, N>::type
get(Tuple & tup)111     get(Tuple& tup)
112     {
113         return at_c<N>(tup);
114     }
115 
116     template <int N, typename Tuple>
117     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
118     inline typename result_of::at_c<Tuple const, N>::type
get(Tuple const & tup)119     get(Tuple const& tup)
120     {
121         return at_c<N>(tup);
122     }
123 }}
124 
125 #endif
126 #endif
127 
128