1 | // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
2 | // (C) Copyright 2004-2007 Jonathan Turkanis |
3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) |
5 | |
6 | // See http://www.boost.org/libs/iostreams for documentation. |
7 | |
8 | #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED |
9 | #define BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED |
10 | |
11 | #if defined(_MSC_VER) |
12 | # pragma once |
13 | #endif |
14 | |
15 | #include <memory> // allocator. |
16 | #include <boost/iostreams/detail/access_control.hpp> |
17 | #include <boost/iostreams/detail/char_traits.hpp> |
18 | #include <boost/iostreams/detail/iostream.hpp> // standard streams. |
19 | #include <boost/iostreams/detail/push.hpp> |
20 | #include <boost/iostreams/detail/select.hpp> |
21 | #include <boost/iostreams/detail/streambuf.hpp> // pubsync. |
22 | #include <boost/iostreams/filtering_streambuf.hpp> |
23 | #include <boost/mpl/and.hpp> |
24 | #include <boost/mpl/bool.hpp> |
25 | #include <boost/static_assert.hpp> |
26 | #include <boost/type_traits/is_convertible.hpp> |
27 | |
28 | // Must come last. |
29 | #include <boost/iostreams/detail/config/disable_warnings.hpp> // MSVC. |
30 | |
31 | namespace boost { namespace iostreams { |
32 | |
33 | //--------------Definition of filtered_istream--------------------------------// |
34 | |
35 | namespace detail { |
36 | |
37 | template<typename Mode, typename Ch, typename Tr> |
38 | struct filtering_stream_traits { |
39 | typedef typename |
40 | iostreams::select< // Disambiguation for Tru64 |
41 | mpl::and_< |
42 | is_convertible<Mode, input>, |
43 | is_convertible<Mode, output> |
44 | >, |
45 | BOOST_IOSTREAMS_BASIC_IOSTREAM(Ch, Tr), |
46 | is_convertible<Mode, input>, |
47 | BOOST_IOSTREAMS_BASIC_ISTREAM(Ch, Tr), |
48 | else_, |
49 | BOOST_IOSTREAMS_BASIC_OSTREAM(Ch, Tr) |
50 | >::type stream_type; |
51 | typedef typename |
52 | iostreams::select< // Dismbiguation required for Tru64. |
53 | mpl::and_< |
54 | is_convertible<Mode, input>, |
55 | is_convertible<Mode, output> |
56 | >, |
57 | iostream_tag, |
58 | is_convertible<Mode, input>, |
59 | istream_tag, |
60 | else_, |
61 | ostream_tag |
62 | >::type stream_tag; |
63 | }; |
64 | |
65 | #if defined(BOOST_MSVC) && (BOOST_MSVC == 1700) |
66 | # pragma warning(push) |
67 | // https://connect.microsoft.com/VisualStudio/feedback/details/733720/ |
68 | # pragma warning(disable: 4250) |
69 | #endif |
70 | |
71 | template<typename Chain, typename Access> |
72 | class filtering_stream_base |
73 | : public access_control< |
74 | boost::iostreams::detail::chain_client<Chain>, |
75 | Access |
76 | >, |
77 | public filtering_stream_traits< |
78 | typename Chain::mode, |
79 | typename Chain::char_type, |
80 | typename Chain::traits_type |
81 | >::stream_type |
82 | { |
83 | public: |
84 | typedef Chain chain_type; |
85 | typedef access_control< |
86 | boost::iostreams::detail::chain_client<Chain>, |
87 | Access |
88 | > client_type; |
89 | protected: |
90 | typedef typename |
91 | filtering_stream_traits< |
92 | typename Chain::mode, |
93 | typename Chain::char_type, |
94 | typename Chain::traits_type |
95 | >::stream_type stream_type; |
96 | filtering_stream_base() : stream_type(0) { this->set_chain(&chain_); } |
97 | private: |
98 | void notify() { this->rdbuf(chain_.empty() ? 0 : &chain_.front()); } |
99 | Chain chain_; |
100 | }; |
101 | |
102 | #if defined(BOOST_MSVC) && (BOOST_MSVC == 1700) |
103 | # pragma warning(pop) |
104 | #endif |
105 | |
106 | } // End namespace detail. |
107 | |
108 | // |
109 | // Macro: BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) |
110 | // Description: Defines a template derived from std::basic_streambuf which uses |
111 | // a chain to perform i/o. The template has the following parameters: |
112 | // Mode - the i/o mode. |
113 | // Ch - The character type. |
114 | // Tr - The character traits type. |
115 | // Alloc - The allocator type. |
116 | // Access - Indicates accessibility of the chain interface; must be either |
117 | // public_ or protected_; defaults to public_. |
118 | // Macro parameters: |
119 | // name_ - The name of the template to be defined. |
120 | // chain_type_ - The name of the chain template. |
121 | // default_char_ - The default value for the char template parameter. |
122 | // |
123 | #define BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) \ |
124 | template< typename Mode, \ |
125 | typename Ch = default_char_, \ |
126 | typename Tr = BOOST_IOSTREAMS_CHAR_TRAITS(Ch), \ |
127 | typename Alloc = std::allocator<Ch>, \ |
128 | typename Access = public_ > \ |
129 | class name_ \ |
130 | : public boost::iostreams::detail::filtering_stream_base< \ |
131 | chain_type_<Mode, Ch, Tr, Alloc>, Access \ |
132 | > \ |
133 | { \ |
134 | public: \ |
135 | typedef Ch char_type; \ |
136 | struct category \ |
137 | : Mode, \ |
138 | closable_tag, \ |
139 | detail::filtering_stream_traits<Mode, Ch, Tr>::stream_tag \ |
140 | { }; \ |
141 | BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) \ |
142 | typedef Mode mode; \ |
143 | typedef chain_type_<Mode, Ch, Tr, Alloc> chain_type; \ |
144 | name_() { } \ |
145 | BOOST_IOSTREAMS_DEFINE_PUSH_CONSTRUCTOR(name_, mode, Ch, push_impl) \ |
146 | ~name_() { \ |
147 | if (this->is_complete()) \ |
148 | this->rdbuf()->BOOST_IOSTREAMS_PUBSYNC(); \ |
149 | } \ |
150 | private: \ |
151 | typedef access_control< \ |
152 | boost::iostreams::detail::chain_client< \ |
153 | chain_type_<Mode, Ch, Tr, Alloc> \ |
154 | >, \ |
155 | Access \ |
156 | > client_type; \ |
157 | template<typename T> \ |
158 | void push_impl(const T& t BOOST_IOSTREAMS_PUSH_PARAMS()) \ |
159 | { client_type::push(t BOOST_IOSTREAMS_PUSH_ARGS()); } \ |
160 | }; \ |
161 | /**/ |
162 | |
163 | #if defined(BOOST_MSVC) && (BOOST_MSVC == 1700) |
164 | # pragma warning(push) |
165 | // https://connect.microsoft.com/VisualStudio/feedback/details/733720/ |
166 | # pragma warning(disable: 4250) |
167 | #endif |
168 | |
169 | BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(filtering_stream, boost::iostreams::chain, char) |
170 | BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(wfiltering_stream, boost::iostreams::chain, wchar_t) |
171 | |
172 | #if defined(BOOST_MSVC) && (BOOST_MSVC == 1700) |
173 | # pragma warning(pop) |
174 | #endif |
175 | |
176 | typedef filtering_stream<input> filtering_istream; |
177 | typedef filtering_stream<output> filtering_ostream; |
178 | typedef wfiltering_stream<input> filtering_wistream; |
179 | typedef wfiltering_stream<output> filtering_wostream; |
180 | |
181 | //----------------------------------------------------------------------------// |
182 | |
183 | } } // End namespace iostreams, boost |
184 | |
185 | #include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC |
186 | |
187 | #endif // #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED |
188 | |