libs/capy/include/boost/capy/buffers/some_buffers.hpp
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libs/capy/include/boost/capy/buffers/some_buffers.hpp
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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2025 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/capy | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_CAPY_BUFFERS_SOME_BUFFERS_HPP | ||
| 11 | #define BOOST_CAPY_BUFFERS_SOME_BUFFERS_HPP | ||
| 12 | |||
| 13 | #include <boost/capy/detail/config.hpp> | ||
| 14 | #include <boost/capy/buffers.hpp> | ||
| 15 | |||
| 16 | #include <cstddef> | ||
| 17 | #include <new> | ||
| 18 | #include <utility> | ||
| 19 | |||
| 20 | namespace boost { | ||
| 21 | namespace capy { | ||
| 22 | |||
| 23 | namespace detail { | ||
| 24 | |||
| 25 | template<class Buffer, class BS, std::size_t... Is> | ||
| 26 | std::size_t | ||
| 27 | 8 | fill_buffers_impl( | |
| 28 | Buffer* arr, | ||
| 29 | BS const& bs, | ||
| 30 | std::index_sequence<Is...>) noexcept | ||
| 31 | { | ||
| 32 | 8 | auto it = begin(bs); | |
| 33 | 8 | auto const last = end(bs); | |
| 34 | 8 | std::size_t n = 0; | |
| 35 |
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8 | ((it != last ? (::new(&arr[Is]) Buffer(*it++), ++n, void()) : void()), ...); |
| 36 | 8 | return n; | |
| 37 | } | ||
| 38 | |||
| 39 | template<class Buffer, class BS> | ||
| 40 | std::size_t | ||
| 41 | 8 | fill_buffers(Buffer* arr, BS const& bs) noexcept | |
| 42 | { | ||
| 43 | 8 | return fill_buffers_impl( | |
| 44 | 8 | arr, bs, std::make_index_sequence<max_iovec_>{}); | |
| 45 | } | ||
| 46 | |||
| 47 | } // detail | ||
| 48 | |||
| 49 | //------------------------------------------------ | ||
| 50 | |||
| 51 | /** A buffer sequence holding up to max_iovec_ const buffers. | ||
| 52 | |||
| 53 | This class stores a fixed-size array of const_buffer | ||
| 54 | descriptors, populated from an arbitrary buffer sequence. | ||
| 55 | It provides efficient storage for small buffer sequences | ||
| 56 | without dynamic allocation. | ||
| 57 | |||
| 58 | @par Usage | ||
| 59 | |||
| 60 | @code | ||
| 61 | void process(ConstBufferSequence auto const& buffers) | ||
| 62 | { | ||
| 63 | some_const_buffers bufs(buffers); | ||
| 64 | // use bufs.data(), bufs.size() | ||
| 65 | } | ||
| 66 | @endcode | ||
| 67 | */ | ||
| 68 | class some_const_buffers | ||
| 69 | { | ||
| 70 | union { | ||
| 71 | int dummy_; | ||
| 72 | const_buffer arr_[detail::max_iovec_]; | ||
| 73 | }; | ||
| 74 | std::size_t n_ = 0; | ||
| 75 | |||
| 76 | public: | ||
| 77 | /** Default constructor. | ||
| 78 | |||
| 79 | Constructs an empty buffer sequence. | ||
| 80 | */ | ||
| 81 | 1 | some_const_buffers() noexcept | |
| 82 | 1 | : dummy_(0) | |
| 83 | { | ||
| 84 | 1 | } | |
| 85 | |||
| 86 | /** Copy constructor. | ||
| 87 | */ | ||
| 88 | 1 | some_const_buffers(some_const_buffers const& other) noexcept | |
| 89 | 1 | : n_(other.n_) | |
| 90 | { | ||
| 91 |
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2 | for(std::size_t i = 0; i < n_; ++i) |
| 92 | 1 | ::new(&arr_[i]) const_buffer(other.arr_[i]); | |
| 93 | 1 | } | |
| 94 | |||
| 95 | /** Construct from a buffer sequence. | ||
| 96 | |||
| 97 | Copies up to @ref detail::max_iovec_ buffer descriptors | ||
| 98 | from the source sequence into the internal array. | ||
| 99 | |||
| 100 | @param bs The buffer sequence to copy from. | ||
| 101 | */ | ||
| 102 | template<ConstBufferSequence BS> | ||
| 103 | explicit | ||
| 104 | 4 | some_const_buffers(BS const& bs) noexcept | |
| 105 | 4 | : n_(detail::fill_buffers(arr_, bs)) | |
| 106 | { | ||
| 107 | 4 | } | |
| 108 | |||
| 109 | /** Destructor. | ||
| 110 | */ | ||
| 111 | 6 | ~some_const_buffers() | |
| 112 | { | ||
| 113 |
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13 | while(n_--) |
| 114 | 7 | arr_[n_].~const_buffer(); | |
| 115 | 6 | } | |
| 116 | |||
| 117 | /** Return a pointer to the buffer array. | ||
| 118 | */ | ||
| 119 | const_buffer* | ||
| 120 | 7 | data() noexcept | |
| 121 | { | ||
| 122 | 7 | return arr_; | |
| 123 | } | ||
| 124 | |||
| 125 | /** Return a pointer to the buffer array. | ||
| 126 | */ | ||
| 127 | const_buffer const* | ||
| 128 | data() const noexcept | ||
| 129 | { | ||
| 130 | return arr_; | ||
| 131 | } | ||
| 132 | |||
| 133 | /** Return the number of buffers. | ||
| 134 | */ | ||
| 135 | std::size_t | ||
| 136 | 4 | size() const noexcept | |
| 137 | { | ||
| 138 | 4 | return n_; | |
| 139 | } | ||
| 140 | |||
| 141 | /** Return an iterator to the beginning. | ||
| 142 | */ | ||
| 143 | const_buffer* | ||
| 144 | 2 | begin() noexcept | |
| 145 | { | ||
| 146 | 2 | return arr_; | |
| 147 | } | ||
| 148 | |||
| 149 | /** Return an iterator to the beginning. | ||
| 150 | */ | ||
| 151 | const_buffer const* | ||
| 152 | begin() const noexcept | ||
| 153 | { | ||
| 154 | return arr_; | ||
| 155 | } | ||
| 156 | |||
| 157 | /** Return an iterator to the end. | ||
| 158 | */ | ||
| 159 | const_buffer* | ||
| 160 | 3 | end() noexcept | |
| 161 | { | ||
| 162 | 3 | return arr_ + n_; | |
| 163 | } | ||
| 164 | |||
| 165 | /** Return an iterator to the end. | ||
| 166 | */ | ||
| 167 | const_buffer const* | ||
| 168 | end() const noexcept | ||
| 169 | { | ||
| 170 | return arr_ + n_; | ||
| 171 | } | ||
| 172 | }; | ||
| 173 | |||
| 174 | //------------------------------------------------ | ||
| 175 | |||
| 176 | /** A buffer sequence holding up to max_iovec_ mutable buffers. | ||
| 177 | |||
| 178 | This class stores a fixed-size array of mutable_buffer | ||
| 179 | descriptors, populated from an arbitrary buffer sequence. | ||
| 180 | It provides efficient storage for small buffer sequences | ||
| 181 | without dynamic allocation. | ||
| 182 | |||
| 183 | @par Usage | ||
| 184 | |||
| 185 | @code | ||
| 186 | void process(MutableBufferSequence auto const& buffers) | ||
| 187 | { | ||
| 188 | some_mutable_buffers bufs(buffers); | ||
| 189 | // use bufs.data(), bufs.size() | ||
| 190 | } | ||
| 191 | @endcode | ||
| 192 | */ | ||
| 193 | class some_mutable_buffers | ||
| 194 | { | ||
| 195 | union { | ||
| 196 | int dummy_; | ||
| 197 | mutable_buffer arr_[detail::max_iovec_]; | ||
| 198 | }; | ||
| 199 | std::size_t n_ = 0; | ||
| 200 | |||
| 201 | public: | ||
| 202 | /** Default constructor. | ||
| 203 | |||
| 204 | Constructs an empty buffer sequence. | ||
| 205 | */ | ||
| 206 | 1 | some_mutable_buffers() noexcept | |
| 207 | 1 | : dummy_(0) | |
| 208 | { | ||
| 209 | 1 | } | |
| 210 | |||
| 211 | /** Copy constructor. | ||
| 212 | */ | ||
| 213 | 1 | some_mutable_buffers(some_mutable_buffers const& other) noexcept | |
| 214 | 1 | : n_(other.n_) | |
| 215 | { | ||
| 216 |
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2 | for(std::size_t i = 0; i < n_; ++i) |
| 217 | 1 | ::new(&arr_[i]) mutable_buffer(other.arr_[i]); | |
| 218 | 1 | } | |
| 219 | |||
| 220 | /** Construct from a buffer sequence. | ||
| 221 | |||
| 222 | Copies up to @ref detail::max_iovec_ buffer descriptors | ||
| 223 | from the source sequence into the internal array. | ||
| 224 | |||
| 225 | @param bs The buffer sequence to copy from. | ||
| 226 | */ | ||
| 227 | template<MutableBufferSequence BS> | ||
| 228 | explicit | ||
| 229 | 4 | some_mutable_buffers(BS const& bs) noexcept | |
| 230 | 4 | : n_(detail::fill_buffers(arr_, bs)) | |
| 231 | { | ||
| 232 | 4 | } | |
| 233 | |||
| 234 | /** Destructor. | ||
| 235 | */ | ||
| 236 | 6 | ~some_mutable_buffers() | |
| 237 | { | ||
| 238 |
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13 | while(n_--) |
| 239 | 7 | arr_[n_].~mutable_buffer(); | |
| 240 | 6 | } | |
| 241 | |||
| 242 | /** Return a pointer to the buffer array. | ||
| 243 | */ | ||
| 244 | mutable_buffer* | ||
| 245 | 7 | data() noexcept | |
| 246 | { | ||
| 247 | 7 | return arr_; | |
| 248 | } | ||
| 249 | |||
| 250 | /** Return a pointer to the buffer array. | ||
| 251 | */ | ||
| 252 | mutable_buffer const* | ||
| 253 | data() const noexcept | ||
| 254 | { | ||
| 255 | return arr_; | ||
| 256 | } | ||
| 257 | |||
| 258 | /** Return the number of buffers. | ||
| 259 | */ | ||
| 260 | std::size_t | ||
| 261 | 4 | size() const noexcept | |
| 262 | { | ||
| 263 | 4 | return n_; | |
| 264 | } | ||
| 265 | |||
| 266 | /** Return an iterator to the beginning. | ||
| 267 | */ | ||
| 268 | mutable_buffer* | ||
| 269 | 2 | begin() noexcept | |
| 270 | { | ||
| 271 | 2 | return arr_; | |
| 272 | } | ||
| 273 | |||
| 274 | /** Return an iterator to the beginning. | ||
| 275 | */ | ||
| 276 | mutable_buffer const* | ||
| 277 | begin() const noexcept | ||
| 278 | { | ||
| 279 | return arr_; | ||
| 280 | } | ||
| 281 | |||
| 282 | /** Return an iterator to the end. | ||
| 283 | */ | ||
| 284 | mutable_buffer* | ||
| 285 | 3 | end() noexcept | |
| 286 | { | ||
| 287 | 3 | return arr_ + n_; | |
| 288 | } | ||
| 289 | |||
| 290 | /** Return an iterator to the end. | ||
| 291 | */ | ||
| 292 | mutable_buffer const* | ||
| 293 | end() const noexcept | ||
| 294 | { | ||
| 295 | return arr_ + n_; | ||
| 296 | } | ||
| 297 | }; | ||
| 298 | |||
| 299 | } // namespace capy | ||
| 300 | } // namespace boost | ||
| 301 | |||
| 302 | #endif | ||
| 303 |