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1 | |
2 | #ifndef BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED | |
3 | #define BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED | |
4 | ||
5 | // Copyright Aleksey Gurtovoy 2000-2004 | |
6 | // | |
7 | // Distributed under the Boost Software License, Version 1.0. | |
8 | // (See accompanying file LICENSE_1_0.txt or copy at | |
9 | // http://www.boost.org/LICENSE_1_0.txt) | |
10 | // | |
11 | // See http://www.boost.org/libs/mpl for documentation. | |
12 | ||
13 | // $Id$ | |
14 | // $Date$ | |
15 | // $Revision$ | |
16 | ||
17 | #include <boost/mpl/next_prior.hpp> | |
18 | #include <boost/mpl/deref.hpp> | |
19 | #include <boost/mpl/iterator_tags.hpp> | |
20 | #include <boost/mpl/aux_/lambda_spec.hpp> | |
21 | #include <boost/mpl/aux_/config/ctps.hpp> | |
22 | ||
23 | #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) | |
24 | # include <boost/type_traits/is_same.hpp> | |
25 | #endif | |
26 | ||
27 | namespace boost { namespace mpl { | |
28 | ||
29 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) | |
30 | ||
31 | template< | |
32 | typename Iterator1 | |
33 | , typename LastIterator1 | |
34 | , typename Iterator2 | |
35 | > | |
36 | struct joint_iter | |
37 | { | |
38 | typedef Iterator1 base; | |
39 | typedef forward_iterator_tag category; | |
40 | }; | |
41 | ||
42 | template< | |
43 | typename LastIterator1 | |
44 | , typename Iterator2 | |
45 | > | |
46 | struct joint_iter<LastIterator1,LastIterator1,Iterator2> | |
47 | { | |
48 | typedef Iterator2 base; | |
49 | typedef forward_iterator_tag category; | |
50 | }; | |
51 | ||
52 | ||
53 | template< typename I1, typename L1, typename I2 > | |
54 | struct deref< joint_iter<I1,L1,I2> > | |
55 | { | |
56 | typedef typename joint_iter<I1,L1,I2>::base base_; | |
57 | typedef typename deref<base_>::type type; | |
58 | }; | |
59 | ||
60 | template< typename I1, typename L1, typename I2 > | |
61 | struct next< joint_iter<I1,L1,I2> > | |
62 | { | |
63 | typedef joint_iter< typename mpl::next<I1>::type,L1,I2 > type; | |
64 | }; | |
65 | ||
66 | template< typename L1, typename I2 > | |
67 | struct next< joint_iter<L1,L1,I2> > | |
68 | { | |
69 | typedef joint_iter< L1,L1,typename mpl::next<I2>::type > type; | |
70 | }; | |
71 | ||
72 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION | |
73 | ||
74 | template< | |
75 | typename Iterator1 | |
76 | , typename LastIterator1 | |
77 | , typename Iterator2 | |
78 | > | |
79 | struct joint_iter; | |
80 | ||
81 | template< bool > struct joint_iter_impl | |
82 | { | |
83 | template< typename I1, typename L1, typename I2 > struct result_ | |
84 | { | |
85 | typedef I1 base; | |
86 | typedef forward_iterator_tag category; | |
87 | typedef joint_iter< typename mpl::next<I1>::type,L1,I2 > next; | |
88 | typedef typename deref<I1>::type type; | |
89 | }; | |
90 | }; | |
91 | ||
92 | template<> struct joint_iter_impl<true> | |
93 | { | |
94 | template< typename I1, typename L1, typename I2 > struct result_ | |
95 | { | |
96 | typedef I2 base; | |
97 | typedef forward_iterator_tag category; | |
98 | typedef joint_iter< L1,L1,typename mpl::next<I2>::type > next; | |
99 | typedef typename deref<I2>::type type; | |
100 | }; | |
101 | }; | |
102 | ||
103 | template< | |
104 | typename Iterator1 | |
105 | , typename LastIterator1 | |
106 | , typename Iterator2 | |
107 | > | |
108 | struct joint_iter | |
109 | : joint_iter_impl< is_same<Iterator1,LastIterator1>::value > | |
110 | ::template result_<Iterator1,LastIterator1,Iterator2> | |
111 | { | |
112 | }; | |
113 | ||
114 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION | |
115 | ||
116 | BOOST_MPL_AUX_PASS_THROUGH_LAMBDA_SPEC(3, joint_iter) | |
117 | ||
118 | }} | |
119 | ||
120 | #endif // BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED |