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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2023 Vinnie Falco (vinnie.falco@gmail.com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/cppalliance/buffers | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_BUFFERS_DYNAMIC_BUFFER_HPP | ||
| 11 | #define BOOST_BUFFERS_DYNAMIC_BUFFER_HPP | ||
| 12 | |||
| 13 | #include <boost/buffers/detail/config.hpp> | ||
| 14 | #include <boost/buffers/buffer.hpp> | ||
| 15 | #include <boost/core/span.hpp> | ||
| 16 | #include <cstdlib> | ||
| 17 | |||
| 18 | namespace boost { | ||
| 19 | namespace buffers { | ||
| 20 | |||
| 21 | /** Determine if T is a DynamicBuffer | ||
| 22 | */ | ||
| 23 | template< | ||
| 24 | class T, | ||
| 25 | class = void> | ||
| 26 | struct is_dynamic_buffer : std::false_type {}; | ||
| 27 | |||
| 28 | template<class T> | ||
| 29 | struct is_dynamic_buffer< | ||
| 30 | T, detail::void_t<decltype( | ||
| 31 | std::declval<std::size_t&>() = std::declval<T const&>().size(), | ||
| 32 | std::declval<std::size_t&>() = std::declval<T const&>().max_size(), | ||
| 33 | std::declval<std::size_t&>() = std::declval<T const&>().capacity(), | ||
| 34 | std::declval<T&>().commit(std::declval<std::size_t>()), | ||
| 35 | std::declval<T&>().consume(std::declval<std::size_t>()) | ||
| 36 | ) | ||
| 37 | ,typename std::enable_if< | ||
| 38 | is_const_buffer_sequence<typename T::const_buffers_type>::value && | ||
| 39 | is_mutable_buffer_sequence<typename T::mutable_buffers_type>::value | ||
| 40 | >::type | ||
| 41 | ,typename std::enable_if< | ||
| 42 | std::is_same<decltype( | ||
| 43 | std::declval<T const&>().data()), | ||
| 44 | typename T::const_buffers_type>::value | ||
| 45 | && std::is_same<decltype( | ||
| 46 | std::declval<T&>().prepare( | ||
| 47 | std::declval<std::size_t>())), | ||
| 48 | typename T::mutable_buffers_type>::value | ||
| 49 | >::type | ||
| 50 | > > : std::true_type | ||
| 51 | { | ||
| 52 | }; | ||
| 53 | |||
| 54 | /** An abstract, type-erased dynamic buffer. | ||
| 55 | */ | ||
| 56 | struct BOOST_SYMBOL_VISIBLE | ||
| 57 | any_dynamic_buffer | ||
| 58 | { | ||
| 59 | using const_buffers_type = span<const_buffer const>; | ||
| 60 | using mutable_buffers_type = span<mutable_buffer const>; | ||
| 61 | |||
| 62 | 8192 | virtual ~any_dynamic_buffer() = default; | |
| 63 | virtual std::size_t size() const = 0; | ||
| 64 | virtual std::size_t max_size() const = 0; | ||
| 65 | virtual std::size_t capacity() const = 0; | ||
| 66 | virtual const_buffers_type data() const = 0; | ||
| 67 | virtual mutable_buffers_type prepare(std::size_t) = 0; | ||
| 68 | virtual void commit(std::size_t) = 0; | ||
| 69 | virtual void consume(std::size_t) = 0; | ||
| 70 | }; | ||
| 71 | |||
| 72 | //----------------------------------------------- | ||
| 73 | |||
| 74 | /** A type-erased dynamic buffer. | ||
| 75 | */ | ||
| 76 | template< | ||
| 77 | class DynamicBuffer, | ||
| 78 | std::size_t N = 8> | ||
| 79 | class any_dynamic_buffer_impl | ||
| 80 | : public any_dynamic_buffer | ||
| 81 | { | ||
| 82 | DynamicBuffer b_; | ||
| 83 | const_buffer data_[N]; | ||
| 84 | mutable_buffer out_[N]; | ||
| 85 | std::size_t data_len_ = 0; | ||
| 86 | std::size_t out_len_ = 0; | ||
| 87 | |||
| 88 | template<class ConstBufferSequence, class BufferType> | ||
| 89 | static | ||
| 90 | std::size_t | ||
| 91 | 69760 | unroll( | |
| 92 | ConstBufferSequence const& bs, | ||
| 93 | BufferType* dest, | ||
| 94 | std::size_t len) | ||
| 95 | { | ||
| 96 | 69760 | std::size_t i = 0; | |
| 97 | 69760 | auto const end_ = end(bs); | |
| 98 |
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209280 | for(auto it = begin(bs); it != end_; ++it) |
| 99 | { | ||
| 100 | 139520 | dest[i++] = *it; | |
| 101 |
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139520 | if(i == len) |
| 102 | ✗ | break; | |
| 103 | } | ||
| 104 | 69760 | return i; | |
| 105 | } | ||
| 106 | |||
| 107 | public: | ||
| 108 | template<class DynamicBuffer_> | ||
| 109 | explicit | ||
| 110 | 4096 | any_dynamic_buffer_impl( | |
| 111 | DynamicBuffer_&& b) | ||
| 112 | 4096 | : b_(std::forward<DynamicBuffer_>(b)) | |
| 113 | { | ||
| 114 | 4096 | } | |
| 115 | |||
| 116 | DynamicBuffer& | ||
| 117 | buffer() noexcept | ||
| 118 | { | ||
| 119 | return b_; | ||
| 120 | } | ||
| 121 | |||
| 122 | DynamicBuffer const& | ||
| 123 | buffer() const noexcept | ||
| 124 | { | ||
| 125 | return b_; | ||
| 126 | } | ||
| 127 | |||
| 128 | std::size_t | ||
| 129 | ✗ | size() const override | |
| 130 | { | ||
| 131 | ✗ | return b_.size(); | |
| 132 | } | ||
| 133 | |||
| 134 | std::size_t | ||
| 135 | ✗ | max_size() const override | |
| 136 | { | ||
| 137 | ✗ | return b_.max_size(); | |
| 138 | } | ||
| 139 | |||
| 140 | std::size_t | ||
| 141 | ✗ | capacity() const override | |
| 142 | { | ||
| 143 | ✗ | return b_.capacity(); | |
| 144 | } | ||
| 145 | |||
| 146 | const_buffers_type | ||
| 147 | 12288 | data() const override | |
| 148 | { | ||
| 149 | 24576 | return const_buffers_type( | |
| 150 | 12288 | data_, data_len_); | |
| 151 | } | ||
| 152 | |||
| 153 | auto | ||
| 154 | 11792 | prepare( | |
| 155 | std::size_t n) -> | ||
| 156 | mutable_buffers_type override | ||
| 157 | { | ||
| 158 | 11792 | out_len_ = unroll( | |
| 159 |
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11792 | b_.prepare(n), out_, N); |
| 160 | 23584 | return mutable_buffers_type( | |
| 161 | 11792 | out_, out_len_); | |
| 162 | } | ||
| 163 | |||
| 164 | void | ||
| 165 | 11792 | commit( | |
| 166 | std::size_t n) override | ||
| 167 | { | ||
| 168 | 11792 | b_.commit(n); | |
| 169 | 11792 | data_len_ = unroll( | |
| 170 | 11792 | b_.data(), data_, N); | |
| 171 | 11792 | } | |
| 172 | |||
| 173 | void | ||
| 174 | 11296 | consume( | |
| 175 | std::size_t n) override | ||
| 176 | { | ||
| 177 | 11296 | b_.consume(n); | |
| 178 | 11296 | data_len_ = unroll( | |
| 179 | 11296 | b_.data(), data_, N); | |
| 180 | 11296 | } | |
| 181 | }; | ||
| 182 | |||
| 183 | template< | ||
| 184 | class DynamicBuffer | ||
| 185 | , class = typename std::enable_if< | ||
| 186 | is_dynamic_buffer< | ||
| 187 | typename std::decay<DynamicBuffer>::type | ||
| 188 | >::value>::type | ||
| 189 | > | ||
| 190 | auto | ||
| 191 | 4096 | make_any(DynamicBuffer&& b) -> | |
| 192 | any_dynamic_buffer_impl<typename | ||
| 193 | std::decay<DynamicBuffer>::type> | ||
| 194 | { | ||
| 195 | return any_dynamic_buffer_impl<typename | ||
| 196 | std::decay<DynamicBuffer>::type>( | ||
| 197 | 4096 | std::forward<DynamicBuffer>(b)); | |
| 198 | } | ||
| 199 | |||
| 200 | } // buffers | ||
| 201 | } // boost | ||
| 202 | |||
| 203 | #endif | ||
| 204 |