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1 | // (C) Copyright Gennadiy Rozental 2001. |
2 | // Distributed under the Boost Software License, Version 1.0. | |
3 | // (See accompanying file LICENSE_1_0.txt or copy at | |
4 | // http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | // See http://www.boost.org/libs/test for the library home page. | |
7 | // | |
8 | //!@file | |
9 | //! Input iterator facade | |
10 | // *************************************************************************** | |
11 | ||
12 | #ifndef BOOST_TEST_UTILS_INPUT_ITERATOR_FACADE_HPP | |
13 | #define BOOST_TEST_UTILS_INPUT_ITERATOR_FACADE_HPP | |
14 | ||
15 | // Boost | |
16 | #include <boost/iterator/iterator_facade.hpp> | |
17 | ||
18 | #include <boost/test/detail/suppress_warnings.hpp> | |
19 | ||
20 | //____________________________________________________________________________// | |
21 | ||
22 | namespace boost { | |
23 | namespace unit_test { | |
24 | namespace utils { | |
25 | ||
26 | // ************************************************************************** // | |
27 | // ************** input_iterator_core_access ************** // | |
28 | // ************************************************************************** // | |
29 | ||
30 | class input_iterator_core_access | |
31 | { | |
32 | #if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551)) | |
33 | public: | |
34 | #else | |
35 | template <class I, class V, class R, class TC> friend class input_iterator_facade; | |
36 | #endif | |
37 | ||
38 | template <class Facade> | |
39 | static bool get( Facade& f ) | |
40 | { | |
41 | return f.get(); | |
42 | } | |
43 | ||
44 | private: | |
45 | // objects of this class are useless | |
46 | input_iterator_core_access(); //undefined | |
47 | }; | |
48 | ||
49 | // ************************************************************************** // | |
50 | // ************** input_iterator_facade ************** // | |
51 | // ************************************************************************** // | |
52 | ||
53 | template<typename Derived, | |
54 | typename ValueType, | |
55 | typename Reference = ValueType const&, | |
56 | typename Traversal = single_pass_traversal_tag> | |
57 | class input_iterator_facade : public iterator_facade<Derived,ValueType,Traversal,Reference> | |
58 | { | |
59 | public: | |
60 | // Constructor | |
61 | input_iterator_facade() : m_valid( false ), m_value() {} | |
62 | ||
63 | protected: // provide access to the Derived | |
64 | void init() | |
65 | { | |
66 | m_valid = true; | |
67 | increment(); | |
68 | } | |
69 | ||
70 | // Data members | |
71 | mutable bool m_valid; | |
72 | ValueType m_value; | |
73 | ||
74 | private: | |
75 | friend class boost::iterator_core_access; | |
76 | ||
77 | // iterator facade interface implementation | |
78 | void increment() | |
79 | { | |
80 | // we make post-end incrementation indefinetly safe | |
81 | if( m_valid ) | |
82 | m_valid = input_iterator_core_access::get( *static_cast<Derived*>(this) ); | |
83 | } | |
84 | Reference dereference() const | |
85 | { | |
86 | return m_value; | |
87 | } | |
88 | ||
89 | // iterator facade interface implementation | |
90 | bool equal( input_iterator_facade const& rhs ) const | |
91 | { | |
92 | // two invalid iterator equals, inequal otherwise | |
93 | return !m_valid && !rhs.m_valid; | |
94 | } | |
95 | }; | |
96 | ||
97 | } // namespace utils | |
98 | } // namespace unit_test | |
99 | } // namespace boost | |
100 | ||
101 | //____________________________________________________________________________// | |
102 | ||
103 | #include <boost/test/detail/enable_warnings.hpp> | |
104 | ||
105 | #endif // BOOST_TEST_UTILS_INPUT_ITERATOR_FACADE_HPP |