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1 | #ifndef BOOST_ARCHIVE_ITERATORS_ISTREAM_ITERATOR_HPP |
2 | #define BOOST_ARCHIVE_ITERATORS_ISTREAM_ITERATOR_HPP | |
3 | ||
4 | // MS compatible compilers support #pragma once | |
5 | #if defined(_MSC_VER) | |
6 | # pragma once | |
7 | #endif | |
8 | ||
9 | /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 | |
10 | // istream_iterator.hpp | |
11 | ||
12 | // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . | |
13 | // Use, modification and distribution is subject to the Boost Software | |
14 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
15 | // http://www.boost.org/LICENSE_1_0.txt) | |
16 | ||
17 | // See http://www.boost.org for updates, documentation, and revision history. | |
18 | ||
19 | // note: this is a custom version of the standard istream_iterator. | |
20 | // This is necessary as the standard version doesn't work as expected | |
21 | // for wchar_t based streams on systems for which wchar_t not a true | |
22 | // type but rather a synonym for some integer type. | |
23 | ||
24 | #include <cstddef> // NULL | |
25 | #include <istream> | |
26 | #include <boost/iterator/iterator_facade.hpp> | |
27 | ||
28 | namespace boost { | |
29 | namespace archive { | |
30 | namespace iterators { | |
31 | ||
32 | // given a type, make an input iterator based on a pointer to that type | |
33 | template<class Elem = char> | |
34 | class istream_iterator : | |
35 | public boost::iterator_facade< | |
36 | istream_iterator<Elem>, | |
37 | Elem, | |
38 | std::input_iterator_tag, | |
39 | Elem | |
40 | > | |
41 | { | |
42 | friend class boost::iterator_core_access; | |
43 | typedef istream_iterator this_t ; | |
44 | typedef typename boost::iterator_facade< | |
45 | istream_iterator<Elem>, | |
46 | Elem, | |
47 | std::input_iterator_tag, | |
48 | Elem | |
49 | > super_t; | |
50 | typedef typename std::basic_istream<Elem> istream_type; | |
51 | ||
52 | bool equal(const this_t & rhs) const { | |
53 | // note: only works for comparison against end of stream | |
54 | return m_istream == rhs.m_istream; | |
55 | } | |
56 | ||
57 | //Access the value referred to | |
58 | Elem dereference() const { | |
59 | return m_istream->peek(); | |
60 | } | |
61 | ||
62 | void increment(){ | |
63 | if(NULL != m_istream){ | |
64 | m_istream->ignore(1); | |
65 | } | |
66 | } | |
67 | ||
68 | istream_type *m_istream; | |
69 | Elem m_current_value; | |
70 | public: | |
71 | istream_iterator(istream_type & is) : | |
72 | m_istream(& is) | |
73 | { | |
74 | //increment(); | |
75 | } | |
76 | ||
77 | istream_iterator() : | |
78 | m_istream(NULL) | |
79 | {} | |
80 | ||
81 | istream_iterator(const istream_iterator<Elem> & rhs) : | |
82 | m_istream(rhs.m_istream), | |
83 | m_current_value(rhs.m_current_value) | |
84 | {} | |
85 | ||
86 | }; | |
87 | ||
88 | } // namespace iterators | |
89 | } // namespace archive | |
90 | } // namespace boost | |
91 | ||
92 | #endif // BOOST_ARCHIVE_ITERATORS_ISTREAM_ITERATOR_HPP |