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1 | // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
2 | // (C) Copyright 2005-2007 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_TEE_HPP_INCLUDED | |
9 | #define BOOST_IOSTREAMS_TEE_HPP_INCLUDED | |
10 | ||
11 | #if defined(_MSC_VER) | |
12 | # pragma once | |
13 | #endif | |
14 | ||
15 | #include <boost/assert.hpp> | |
16 | #include <boost/config.hpp> // BOOST_DEDUCE_TYPENAME. | |
17 | #include <boost/iostreams/categories.hpp> | |
18 | #include <boost/iostreams/detail/adapter/device_adapter.hpp> | |
19 | #include <boost/iostreams/detail/adapter/filter_adapter.hpp> | |
20 | #include <boost/iostreams/detail/call_traits.hpp> | |
21 | #include <boost/iostreams/detail/execute.hpp> | |
22 | #include <boost/iostreams/detail/functional.hpp> // call_close_all | |
23 | #include <boost/iostreams/operations.hpp> | |
24 | #include <boost/iostreams/pipeline.hpp> | |
25 | #include <boost/iostreams/traits.hpp> | |
26 | #include <boost/static_assert.hpp> | |
27 | #include <boost/type_traits/is_convertible.hpp> | |
28 | #include <boost/type_traits/is_same.hpp> | |
29 | ||
30 | namespace boost { namespace iostreams { | |
31 | ||
32 | // | |
33 | // Template name: tee_filter. | |
34 | // Template parameters: | |
35 | // Device - A blocking Sink. | |
36 | // | |
37 | template<typename Device> | |
38 | class tee_filter : public detail::filter_adapter<Device> { | |
39 | public: | |
40 | typedef typename detail::param_type<Device>::type param_type; | |
41 | typedef typename char_type_of<Device>::type char_type; | |
42 | struct category | |
43 | : dual_use_filter_tag, | |
44 | multichar_tag, | |
45 | closable_tag, | |
46 | flushable_tag, | |
47 | localizable_tag, | |
48 | optimally_buffered_tag | |
49 | { }; | |
50 | ||
51 | BOOST_STATIC_ASSERT(is_device<Device>::value); | |
52 | BOOST_STATIC_ASSERT(( | |
53 | is_convertible< // Using mode_of causes failures on VC6-7.0. | |
54 | BOOST_DEDUCED_TYPENAME iostreams::category_of<Device>::type, output | |
55 | >::value | |
56 | )); | |
57 | ||
58 | explicit tee_filter(param_type dev) | |
59 | : detail::filter_adapter<Device>(dev) | |
60 | { } | |
61 | ||
62 | template<typename Source> | |
63 | std::streamsize read(Source& src, char_type* s, std::streamsize n) | |
64 | { | |
65 | std::streamsize result = iostreams::read(src, s, n); | |
66 | if (result != -1) { | |
67 | std::streamsize result2 = iostreams::write(this->component(), s, result); | |
68 | (void) result2; // Suppress 'unused variable' warning. | |
69 | BOOST_ASSERT(result == result2); | |
70 | } | |
71 | return result; | |
72 | } | |
73 | ||
74 | template<typename Sink> | |
75 | std::streamsize write(Sink& snk, const char_type* s, std::streamsize n) | |
76 | { | |
77 | std::streamsize result = iostreams::write(snk, s, n); | |
78 | std::streamsize result2 = iostreams::write(this->component(), s, result); | |
79 | (void) result2; // Suppress 'unused variable' warning. | |
80 | BOOST_ASSERT(result == result2); | |
81 | return result; | |
82 | } | |
83 | ||
84 | template<typename Next> | |
85 | void close(Next&, BOOST_IOS::openmode) | |
86 | { | |
87 | detail::close_all(this->component()); | |
88 | } | |
89 | ||
90 | template<typename Sink> | |
91 | bool flush(Sink& snk) | |
92 | { | |
93 | bool r1 = iostreams::flush(snk); | |
94 | bool r2 = iostreams::flush(this->component()); | |
95 | return r1 && r2; | |
96 | } | |
97 | }; | |
98 | BOOST_IOSTREAMS_PIPABLE(tee_filter, 1) | |
99 | ||
100 | // | |
101 | // Template name: tee_device. | |
102 | // Template parameters: | |
103 | // Device - A blocking Device. | |
104 | // Sink - A blocking Sink. | |
105 | // | |
106 | template<typename Device, typename Sink> | |
107 | class tee_device { | |
108 | public: | |
109 | typedef typename detail::param_type<Device>::type device_param; | |
110 | typedef typename detail::param_type<Sink>::type sink_param; | |
111 | typedef typename detail::value_type<Device>::type device_value; | |
112 | typedef typename detail::value_type<Sink>::type sink_value; | |
113 | typedef typename char_type_of<Device>::type char_type; | |
114 | typedef typename | |
115 | mpl::if_< | |
116 | is_convertible< | |
117 | BOOST_DEDUCED_TYPENAME | |
118 | iostreams::category_of<Device>::type, | |
119 | output | |
120 | >, | |
121 | output, | |
122 | input | |
123 | >::type mode; | |
124 | BOOST_STATIC_ASSERT(is_device<Device>::value); | |
125 | BOOST_STATIC_ASSERT(is_device<Sink>::value); | |
126 | BOOST_STATIC_ASSERT(( | |
127 | is_same< | |
128 | char_type, | |
129 | BOOST_DEDUCED_TYPENAME char_type_of<Sink>::type | |
130 | >::value | |
131 | )); | |
132 | BOOST_STATIC_ASSERT(( | |
133 | is_convertible< | |
134 | BOOST_DEDUCED_TYPENAME iostreams::category_of<Sink>::type, | |
135 | output | |
136 | >::value | |
137 | )); | |
138 | struct category | |
139 | : mode, | |
140 | device_tag, | |
141 | closable_tag, | |
142 | flushable_tag, | |
143 | localizable_tag, | |
144 | optimally_buffered_tag | |
145 | { }; | |
146 | tee_device(device_param device, sink_param sink) | |
147 | : dev_(device), sink_(sink) | |
148 | { } | |
149 | std::streamsize read(char_type* s, std::streamsize n) | |
150 | { | |
151 | BOOST_STATIC_ASSERT(( | |
152 | is_convertible< | |
153 | BOOST_DEDUCED_TYPENAME iostreams::category_of<Device>::type, input | |
154 | >::value | |
155 | )); | |
156 | std::streamsize result1 = iostreams::read(dev_, s, n); | |
157 | if (result1 != -1) { | |
158 | std::streamsize result2 = iostreams::write(sink_, s, result1); | |
159 | (void) result1; // Suppress 'unused variable' warning. | |
160 | (void) result2; | |
161 | BOOST_ASSERT(result1 == result2); | |
162 | } | |
163 | return result1; | |
164 | } | |
165 | std::streamsize write(const char_type* s, std::streamsize n) | |
166 | { | |
167 | BOOST_STATIC_ASSERT(( | |
168 | is_convertible< | |
169 | BOOST_DEDUCED_TYPENAME iostreams::category_of<Device>::type, output | |
170 | >::value | |
171 | )); | |
172 | std::streamsize result1 = iostreams::write(dev_, s, n); | |
173 | std::streamsize result2 = iostreams::write(sink_, s, n); | |
174 | (void) result1; // Suppress 'unused variable' warning. | |
175 | (void) result2; | |
176 | BOOST_ASSERT(result1 == n && result2 == n); | |
177 | return n; | |
178 | } | |
179 | void close() | |
180 | { | |
181 | detail::execute_all( detail::call_close_all(dev_), | |
182 | detail::call_close_all(sink_) ); | |
183 | } | |
184 | bool flush() | |
185 | { | |
186 | bool r1 = iostreams::flush(dev_); | |
187 | bool r2 = iostreams::flush(sink_); | |
188 | return r1 && r2; | |
189 | } | |
190 | template<typename Locale> | |
191 | void imbue(const Locale& loc) | |
192 | { | |
193 | iostreams::imbue(dev_, loc); | |
194 | iostreams::imbue(sink_, loc); | |
195 | } | |
196 | std::streamsize optimal_buffer_size() const | |
197 | { | |
198 | return (std::max) ( iostreams::optimal_buffer_size(dev_), | |
199 | iostreams::optimal_buffer_size(sink_) ); | |
200 | } | |
201 | private: | |
202 | device_value dev_; | |
203 | sink_value sink_; | |
204 | }; | |
205 | ||
206 | template<typename Sink> | |
207 | tee_filter<Sink> tee(Sink& snk) | |
208 | { return tee_filter<Sink>(snk); } | |
209 | ||
210 | template<typename Sink> | |
211 | tee_filter<Sink> tee(const Sink& snk) | |
212 | { return tee_filter<Sink>(snk); } | |
213 | ||
214 | template<typename Device, typename Sink> | |
215 | tee_device<Device, Sink> tee(Device& dev, Sink& sink) | |
216 | { return tee_device<Device, Sink>(dev, sink); } | |
217 | ||
218 | template<typename Device, typename Sink> | |
219 | tee_device<Device, Sink> tee(const Device& dev, Sink& sink) | |
220 | { return tee_device<Device, Sink>(dev, sink); } | |
221 | ||
222 | template<typename Device, typename Sink> | |
223 | tee_device<Device, Sink> tee(Device& dev, const Sink& sink) | |
224 | { return tee_device<Device, Sink>(dev, sink); } | |
225 | ||
226 | template<typename Device, typename Sink> | |
227 | tee_device<Device, Sink> tee(const Device& dev, const Sink& sink) | |
228 | { return tee_device<Device, Sink>(dev, sink); } | |
229 | ||
230 | } } // End namespaces iostreams, boost. | |
231 | ||
232 | #endif // #ifndef BOOST_IOSTREAMS_TEE_HPP_INCLUDED |