Jeff Thompson | 86b6d64 | 2013-10-17 15:01:56 -0700 | [diff] [blame] | 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 NDNBOOST_IOSTREAMS_TEE_HPP_INCLUDED |
| 9 | #define NDNBOOST_IOSTREAMS_TEE_HPP_INCLUDED |
| 10 | |
| 11 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
| 12 | # pragma once |
| 13 | #endif |
| 14 | |
| 15 | #include <ndnboost/assert.hpp> |
| 16 | #include <ndnboost/config.hpp> // NDNBOOST_DEDUCE_TYPENAME. |
| 17 | #include <ndnboost/iostreams/categories.hpp> |
| 18 | #include <ndnboost/iostreams/detail/adapter/device_adapter.hpp> |
| 19 | #include <ndnboost/iostreams/detail/adapter/filter_adapter.hpp> |
| 20 | #include <ndnboost/iostreams/detail/call_traits.hpp> |
| 21 | #include <ndnboost/iostreams/detail/execute.hpp> |
| 22 | #include <ndnboost/iostreams/detail/functional.hpp> // call_close_all |
| 23 | #include <ndnboost/iostreams/operations.hpp> |
| 24 | #include <ndnboost/iostreams/pipeline.hpp> |
| 25 | #include <ndnboost/iostreams/traits.hpp> |
| 26 | #include <ndnboost/static_assert.hpp> |
| 27 | #include <ndnboost/type_traits/is_convertible.hpp> |
| 28 | #include <ndnboost/type_traits/is_same.hpp> |
| 29 | |
| 30 | namespace ndnboost { 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 | NDNBOOST_STATIC_ASSERT(is_device<Device>::value); |
| 52 | NDNBOOST_STATIC_ASSERT(( |
| 53 | is_convertible< // Using mode_of causes failures on VC6-7.0. |
| 54 | NDNBOOST_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 | NDNBOOST_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 | NDNBOOST_ASSERT(result == result2); |
| 81 | return result; |
| 82 | } |
| 83 | |
| 84 | template<typename Next> |
| 85 | void close(Next&, NDNBOOST_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 | NDNBOOST_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 | NDNBOOST_DEDUCED_TYPENAME |
| 118 | iostreams::category_of<Device>::type, |
| 119 | output |
| 120 | >, |
| 121 | output, |
| 122 | input |
| 123 | >::type mode; |
| 124 | NDNBOOST_STATIC_ASSERT(is_device<Device>::value); |
| 125 | NDNBOOST_STATIC_ASSERT(is_device<Sink>::value); |
| 126 | NDNBOOST_STATIC_ASSERT(( |
| 127 | is_same< |
| 128 | char_type, |
| 129 | NDNBOOST_DEDUCED_TYPENAME char_type_of<Sink>::type |
| 130 | >::value |
| 131 | )); |
| 132 | NDNBOOST_STATIC_ASSERT(( |
| 133 | is_convertible< |
| 134 | NDNBOOST_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 | NDNBOOST_STATIC_ASSERT(( |
| 152 | is_convertible< |
| 153 | NDNBOOST_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 | NDNBOOST_ASSERT(result1 == result2); |
| 162 | } |
| 163 | return result1; |
| 164 | } |
| 165 | std::streamsize write(const char_type* s, std::streamsize n) |
| 166 | { |
| 167 | NDNBOOST_STATIC_ASSERT(( |
| 168 | is_convertible< |
| 169 | NDNBOOST_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 | NDNBOOST_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 NDNBOOST_IOSTREAMS_TEE_HPP_INCLUDED |