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1 | // Boost.Range library |
2 | // | |
3 | // Copyright Neil Groves 2010. Use, modification and | |
4 | // distribution is subject to the Boost Software License, Version | |
5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt) | |
7 | // | |
8 | // For more information, see http://www.boost.org/libs/range/ | |
9 | // | |
10 | #ifndef BOOST_RANGE_DETAIL_ANY_ITERATOR_BUFFER_HPP_INCLUDED | |
11 | #define BOOST_RANGE_DETAIL_ANY_ITERATOR_BUFFER_HPP_INCLUDED | |
12 | ||
13 | #include <boost/array.hpp> | |
14 | #include <boost/assert.hpp> | |
15 | #include <boost/static_assert.hpp> | |
16 | #include <boost/noncopyable.hpp> | |
17 | ||
18 | namespace boost | |
19 | { | |
20 | template<std::size_t StackBufferSize> | |
21 | class any_iterator_buffer | |
22 | : noncopyable | |
23 | { | |
24 | BOOST_STATIC_ASSERT(( StackBufferSize > 0 )); | |
25 | public: | |
26 | any_iterator_buffer() | |
27 | : m_ptr() | |
28 | { | |
29 | } | |
30 | ||
31 | ~any_iterator_buffer() | |
32 | { | |
33 | delete [] m_ptr; | |
34 | } | |
35 | ||
36 | void* allocate(std::size_t bytes) | |
37 | { | |
38 | BOOST_ASSERT( !m_ptr ); | |
39 | if (bytes <= StackBufferSize) | |
40 | return m_buffer.data(); | |
41 | ||
42 | m_ptr = new char[bytes]; | |
43 | return m_ptr; | |
44 | } | |
45 | ||
46 | void deallocate() | |
47 | { | |
48 | delete [] m_ptr; | |
49 | m_ptr = 0; | |
50 | } | |
51 | ||
52 | private: | |
53 | // Rationale: | |
54 | // Do not use inheritance from noncopyable because this causes | |
55 | // the concepts to erroneous detect the derived any_iterator | |
56 | // as noncopyable. | |
57 | any_iterator_buffer(const any_iterator_buffer&); | |
58 | void operator=(const any_iterator_buffer&); | |
59 | ||
60 | char* m_ptr; | |
61 | boost::array<char, StackBufferSize> m_buffer; | |
62 | }; | |
63 | ||
64 | class any_iterator_heap_only_buffer | |
65 | : noncopyable | |
66 | { | |
67 | public: | |
68 | any_iterator_heap_only_buffer() | |
69 | : m_ptr() | |
70 | { | |
71 | } | |
72 | ||
73 | ~any_iterator_heap_only_buffer() | |
74 | { | |
75 | delete [] m_ptr; | |
76 | } | |
77 | ||
78 | void* allocate(std::size_t bytes) | |
79 | { | |
80 | BOOST_ASSERT( !m_ptr ); | |
81 | m_ptr = new char[bytes]; | |
82 | return m_ptr; | |
83 | } | |
84 | ||
85 | void deallocate() | |
86 | { | |
87 | delete [] m_ptr; | |
88 | m_ptr = 0; | |
89 | } | |
90 | ||
91 | private: | |
92 | char* m_ptr; | |
93 | }; | |
94 | ||
95 | template<std::size_t StackBufferSize> | |
96 | class any_iterator_stack_only_buffer | |
97 | { | |
98 | BOOST_STATIC_ASSERT(( StackBufferSize > 0 )); | |
99 | public: | |
100 | void* allocate(std::size_t bytes) | |
101 | { | |
102 | BOOST_ASSERT( bytes <= m_buffer.size() ); | |
103 | return m_buffer.data(); | |
104 | } | |
105 | ||
106 | void deallocate() | |
107 | { | |
108 | } | |
109 | ||
110 | private: | |
111 | boost::array<char, StackBufferSize> m_buffer; | |
112 | }; | |
113 | ||
114 | typedef any_iterator_buffer<64> any_iterator_default_buffer; | |
115 | } // namespace boost | |
116 | ||
117 | #endif // include guard |