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1 | // Copyright (c) 2001 Daniel C. Nuffer |
2 | // Copyright (c) 2001-2011 Hartmut Kaiser | |
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 | #if !defined(BOOST_SPIRIT_ITERATOR_INPUT_ITERATOR_POLICY_MAR_16_2007_1156AM) | |
8 | #define BOOST_SPIRIT_ITERATOR_INPUT_ITERATOR_POLICY_MAR_16_2007_1156AM | |
9 | ||
10 | #include <boost/spirit/home/support/iterators/multi_pass_fwd.hpp> | |
11 | #include <boost/spirit/home/support/iterators/detail/multi_pass.hpp> | |
12 | #include <boost/detail/iterator.hpp> // for boost::detail::iterator_traits | |
13 | #include <boost/assert.hpp> | |
14 | ||
15 | namespace boost { namespace spirit { namespace iterator_policies | |
16 | { | |
17 | namespace input_iterator_is_valid_test_ | |
18 | { | |
19 | /////////////////////////////////////////////////////////////////////// | |
20 | template <typename Token> | |
21 | inline bool token_is_valid(Token const& c) | |
22 | { | |
23 | return c ? true : false; | |
24 | } | |
25 | } | |
26 | ||
27 | /////////////////////////////////////////////////////////////////////////// | |
28 | // class input_iterator | |
29 | // Implementation of the InputPolicy used by multi_pass | |
30 | // | |
31 | // The input_iterator encapsulates an input iterator of type T | |
32 | /////////////////////////////////////////////////////////////////////////// | |
33 | struct input_iterator | |
34 | { | |
35 | /////////////////////////////////////////////////////////////////////// | |
36 | template <typename T> | |
37 | class unique // : public detail::default_input_policy | |
38 | { | |
39 | private: | |
40 | typedef | |
41 | typename boost::detail::iterator_traits<T>::value_type | |
42 | result_type; | |
43 | ||
44 | public: | |
45 | typedef | |
46 | typename boost::detail::iterator_traits<T>::difference_type | |
47 | difference_type; | |
48 | typedef | |
49 | typename boost::detail::iterator_traits<T>::difference_type | |
50 | distance_type; | |
51 | typedef | |
52 | typename boost::detail::iterator_traits<T>::pointer | |
53 | pointer; | |
54 | typedef | |
55 | typename boost::detail::iterator_traits<T>::reference | |
56 | reference; | |
57 | typedef result_type value_type; | |
58 | ||
59 | protected: | |
60 | unique() {} | |
61 | explicit unique(T x) {} | |
62 | ||
63 | void swap(unique&) {} | |
64 | ||
65 | public: | |
66 | template <typename MultiPass> | |
67 | static void destroy(MultiPass&) {} | |
68 | ||
69 | template <typename MultiPass> | |
70 | static typename MultiPass::reference get_input(MultiPass& mp) | |
71 | { | |
72 | return *mp.shared()->input_; | |
73 | } | |
74 | ||
75 | template <typename MultiPass> | |
76 | static void advance_input(MultiPass& mp) | |
77 | { | |
78 | ++mp.shared()->input_; | |
79 | } | |
80 | ||
81 | // test, whether we reached the end of the underlying stream | |
82 | template <typename MultiPass> | |
83 | static bool input_at_eof(MultiPass const& mp) | |
84 | { | |
85 | static T const end_iter; | |
86 | return mp.shared()->input_ == end_iter; | |
87 | } | |
88 | ||
89 | template <typename MultiPass> | |
90 | static bool input_is_valid(MultiPass const& mp, value_type const& t) | |
91 | { | |
92 | using namespace input_iterator_is_valid_test_; | |
93 | return token_is_valid(t); | |
94 | } | |
95 | ||
96 | // no unique data elements | |
97 | }; | |
98 | ||
99 | /////////////////////////////////////////////////////////////////////// | |
100 | template <typename T> | |
101 | struct shared | |
102 | { | |
103 | explicit shared(T const& input) : input_(input) {} | |
104 | ||
105 | T input_; | |
106 | }; | |
107 | }; | |
108 | ||
109 | }}} | |
110 | ||
111 | #endif |