| Line | Branch | Exec | Source |
|---|---|---|---|
| 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/capy | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_CAPY_BUFFERS_DYNAMIC_BUFFER_HPP | ||
| 11 | #define BOOST_CAPY_BUFFERS_DYNAMIC_BUFFER_HPP | ||
| 12 | |||
| 13 | #include <boost/capy/detail/config.hpp> | ||
| 14 | #include <boost/capy/buffers.hpp> | ||
| 15 | #include <boost/capy/concept/dynamic_buffer.hpp> | ||
| 16 | #include <boost/core/span.hpp> | ||
| 17 | #include <cstdlib> | ||
| 18 | |||
| 19 | namespace boost { | ||
| 20 | namespace capy { | ||
| 21 | |||
| 22 | /** Metafunction to detect if a type is a dynamic buffer. | ||
| 23 | */ | ||
| 24 | template<class T> | ||
| 25 | struct is_dynamic_buffer | ||
| 26 | : std::bool_constant<dynamic_buffer<T>> | ||
| 27 | { | ||
| 28 | }; | ||
| 29 | |||
| 30 | /** An abstract, type-erased dynamic buffer. | ||
| 31 | */ | ||
| 32 | struct BOOST_SYMBOL_VISIBLE | ||
| 33 | any_dynamic_buffer | ||
| 34 | { | ||
| 35 | using const_buffers_type = span<const_buffer const>; | ||
| 36 | using mutable_buffers_type = span<mutable_buffer const>; | ||
| 37 | |||
| 38 | 8192 | virtual ~any_dynamic_buffer() = default; | |
| 39 | virtual std::size_t size() const = 0; | ||
| 40 | virtual std::size_t max_size() const = 0; | ||
| 41 | virtual std::size_t capacity() const = 0; | ||
| 42 | virtual const_buffers_type data() const = 0; | ||
| 43 | virtual mutable_buffers_type prepare(std::size_t) = 0; | ||
| 44 | virtual void commit(std::size_t) = 0; | ||
| 45 | virtual void consume(std::size_t) = 0; | ||
| 46 | }; | ||
| 47 | |||
| 48 | //----------------------------------------------- | ||
| 49 | |||
| 50 | /** A type-erased dynamic buffer. | ||
| 51 | */ | ||
| 52 | template< | ||
| 53 | dynamic_buffer DynamicBuffer, | ||
| 54 | std::size_t N = 8> | ||
| 55 | class any_dynamic_buffer_impl | ||
| 56 | : public any_dynamic_buffer | ||
| 57 | { | ||
| 58 | DynamicBuffer b_; | ||
| 59 | const_buffer data_[N]; | ||
| 60 | mutable_buffer out_[N]; | ||
| 61 | std::size_t data_len_ = 0; | ||
| 62 | std::size_t out_len_ = 0; | ||
| 63 | |||
| 64 | template<const_buffer_sequence ConstBufferSequence, class BufferType> | ||
| 65 | static | ||
| 66 | std::size_t | ||
| 67 | 69760 | unroll( | |
| 68 | ConstBufferSequence const& bs, | ||
| 69 | BufferType* dest, | ||
| 70 | std::size_t len) | ||
| 71 | { | ||
| 72 | 69760 | std::size_t i = 0; | |
| 73 | 69760 | auto const end_ = end(bs); | |
| 74 |
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209280 | for(auto it = begin(bs); it != end_; ++it) |
| 75 | { | ||
| 76 | 139520 | dest[i++] = *it; | |
| 77 |
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139520 | if(i == len) |
| 78 | ✗ | break; | |
| 79 | } | ||
| 80 | 69760 | return i; | |
| 81 | } | ||
| 82 | |||
| 83 | public: | ||
| 84 | template<class DynamicBuffer_> | ||
| 85 | explicit | ||
| 86 | 4096 | any_dynamic_buffer_impl( | |
| 87 | DynamicBuffer_&& b) | ||
| 88 | 4096 | : b_(std::forward<DynamicBuffer_>(b)) | |
| 89 | { | ||
| 90 | 4096 | } | |
| 91 | |||
| 92 | DynamicBuffer& | ||
| 93 | buffer() noexcept | ||
| 94 | { | ||
| 95 | return b_; | ||
| 96 | } | ||
| 97 | |||
| 98 | DynamicBuffer const& | ||
| 99 | buffer() const noexcept | ||
| 100 | { | ||
| 101 | return b_; | ||
| 102 | } | ||
| 103 | |||
| 104 | std::size_t | ||
| 105 | ✗ | size() const override | |
| 106 | { | ||
| 107 | ✗ | return b_.size(); | |
| 108 | } | ||
| 109 | |||
| 110 | std::size_t | ||
| 111 | ✗ | max_size() const override | |
| 112 | { | ||
| 113 | ✗ | return b_.max_size(); | |
| 114 | } | ||
| 115 | |||
| 116 | std::size_t | ||
| 117 | ✗ | capacity() const override | |
| 118 | { | ||
| 119 | ✗ | return b_.capacity(); | |
| 120 | } | ||
| 121 | |||
| 122 | const_buffers_type | ||
| 123 | 12288 | data() const override | |
| 124 | { | ||
| 125 | 24576 | return const_buffers_type( | |
| 126 | 12288 | data_, data_len_); | |
| 127 | } | ||
| 128 | |||
| 129 | auto | ||
| 130 | 11792 | prepare( | |
| 131 | std::size_t n) -> | ||
| 132 | mutable_buffers_type override | ||
| 133 | { | ||
| 134 | 11792 | out_len_ = unroll( | |
| 135 |
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11792 | b_.prepare(n), out_, N); |
| 136 | 23584 | return mutable_buffers_type( | |
| 137 | 11792 | out_, out_len_); | |
| 138 | } | ||
| 139 | |||
| 140 | void | ||
| 141 | 11792 | commit( | |
| 142 | std::size_t n) override | ||
| 143 | { | ||
| 144 | 11792 | b_.commit(n); | |
| 145 | 11792 | data_len_ = unroll( | |
| 146 | 11792 | b_.data(), data_, N); | |
| 147 | 11792 | } | |
| 148 | |||
| 149 | void | ||
| 150 | 11296 | consume( | |
| 151 | std::size_t n) override | ||
| 152 | { | ||
| 153 | 11296 | b_.consume(n); | |
| 154 | 11296 | data_len_ = unroll( | |
| 155 | 11296 | b_.data(), data_, N); | |
| 156 | 11296 | } | |
| 157 | }; | ||
| 158 | |||
| 159 | template<dynamic_buffer DynamicBuffer> | ||
| 160 | auto | ||
| 161 | 4096 | make_any(DynamicBuffer&& b) -> | |
| 162 | any_dynamic_buffer_impl<std::decay_t<DynamicBuffer>> | ||
| 163 | { | ||
| 164 | return any_dynamic_buffer_impl<std::decay_t<DynamicBuffer>>( | ||
| 165 | 4096 | std::forward<DynamicBuffer>(b)); | |
| 166 | } | ||
| 167 | |||
| 168 | } // capy | ||
| 169 | } // boost | ||
| 170 | |||
| 171 | #endif | ||
| 172 |