1/*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
3 Copyright (c) 2005 Eric Niebler
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(FUSION_CONS_07172005_0843)
9#define FUSION_CONS_07172005_0843
10
11#include <boost/fusion/support/config.hpp>
12#include <boost/fusion/support/void.hpp>
13#include <boost/fusion/support/detail/enabler.hpp>
14#include <boost/fusion/container/list/cons_fwd.hpp>
15#include <boost/fusion/support/detail/access.hpp>
16#include <boost/fusion/sequence/intrinsic/begin.hpp>
17#include <boost/fusion/sequence/intrinsic/end.hpp>
18#include <boost/fusion/iterator/next.hpp>
19#include <boost/fusion/iterator/deref.hpp>
20#include <boost/fusion/container/list/nil.hpp>
21#include <boost/fusion/container/list/cons_iterator.hpp>
22#include <boost/fusion/container/list/detail/begin_impl.hpp>
23#include <boost/fusion/container/list/detail/end_impl.hpp>
24#include <boost/fusion/container/list/detail/at_impl.hpp>
25#include <boost/fusion/container/list/detail/value_at_impl.hpp>
26#include <boost/fusion/container/list/detail/empty_impl.hpp>
27#include <boost/type_traits/is_convertible.hpp>
28#include <boost/type_traits/is_base_of.hpp>
29#include <boost/utility/enable_if.hpp>
30#include <boost/fusion/support/sequence_base.hpp>
31#include <boost/fusion/support/is_sequence.hpp>
32#include <boost/mpl/int.hpp>
33#include <boost/mpl/bool.hpp>
34#include <boost/mpl/and.hpp>
35#include <boost/mpl/not.hpp>
36
37namespace boost { namespace fusion
38{
39 struct cons_tag;
40 struct forward_traversal_tag;
41 struct fusion_sequence_tag;
42
43 template <typename Car, typename Cdr /*= nil_*/>
44 struct cons : sequence_base<cons<Car, Cdr> >
45 {
46 typedef mpl::int_<Cdr::size::value+1> size;
47 typedef cons_tag fusion_tag;
48 typedef fusion_sequence_tag tag; // this gets picked up by MPL
49 typedef mpl::false_ is_view;
50 typedef forward_traversal_tag category;
51 typedef Car car_type;
52 typedef Cdr cdr_type;
53
54 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
55 cons()
56 : car(), cdr() {}
57
58 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
59 explicit cons(typename detail::call_param<Car>::type in_car)
60 : car(in_car), cdr() {}
61
62 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
63 cons(
64 typename detail::call_param<Car>::type in_car
65 , typename detail::call_param<Cdr>::type in_cdr)
66 : car(in_car), cdr(in_cdr) {}
67
68 template <typename Car2, typename Cdr2>
69 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
70 cons(cons<Car2, Cdr2> const& rhs)
71 : car(rhs.car), cdr(rhs.cdr) {}
72
73#if BOOST_WORKAROUND(BOOST_GCC, / 100 == 406) && !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)
74 // Workaround for `array used as initializer` compile error on gcc 4.6 w/ c++0x.
75 template <typename = void>
76#endif
77 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
78 cons(cons const& rhs)
79 : car(rhs.car), cdr(rhs.cdr) {}
80
81 template <typename Sequence>
82 BOOST_FUSION_GPU_ENABLED
83 cons(
84 Sequence const& seq
85 , typename boost::enable_if<
86 mpl::and_<
87 traits::is_sequence<Sequence>
88 , mpl::not_<is_base_of<cons, Sequence> >
89 , mpl::not_<is_convertible<Sequence, Car> > > // use copy to car instead
90 , detail::enabler_
91 >::type = detail::enabler
92 )
93 : car(*fusion::begin(seq))
94 , cdr(fusion::next(fusion::begin(seq)), mpl::true_()) {}
95
96 template <typename Iterator>
97 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
98 cons(Iterator const& iter, mpl::true_ /*this_is_an_iterator*/)
99 : car(*iter)
100 , cdr(fusion::next(iter), mpl::true_()) {}
101
102 template <typename Car2, typename Cdr2>
103 BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
104 cons& operator=(cons<Car2, Cdr2> const& rhs)
105 {
106 car = rhs.car;
107 cdr = rhs.cdr;
108 return *this;
109 }
110
111 BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
112 cons& operator=(cons const& rhs)
113 {
114 car = rhs.car;
115 cdr = rhs.cdr;
116 return *this;
117 }
118
119 template <typename Sequence>
120 BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
121 typename boost::enable_if<
122 mpl::and_<
123 traits::is_sequence<Sequence>
124 , mpl::not_<is_convertible<Sequence, Car> > >
125 , cons&>::type
126 operator=(Sequence const& seq)
127 {
128 typedef typename result_of::begin<Sequence const>::type Iterator;
129 Iterator iter = fusion::begin(seq);
130 this->assign_from_iter(iter);
131 return *this;
132 }
133
134 template <typename Iterator>
135 BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
136 void assign_from_iter(Iterator const& iter)
137 {
138 car = *iter;
139 cdr.assign_from_iter(fusion::next(iter));
140 }
141
142 car_type car;
143 cdr_type cdr;
144 };
145}}
146
147#endif
148
149

source code of include/boost/fusion/container/list/cons.hpp