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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_MUTABLE_BUFFER_HPP | ||
| 11 | #define BOOST_BUFFERS_MUTABLE_BUFFER_HPP | ||
| 12 | |||
| 13 | #include <boost/buffers/detail/config.hpp> | ||
| 14 | #include <boost/buffers/tag_invoke.hpp> | ||
| 15 | #include <cstddef> | ||
| 16 | #include <type_traits> | ||
| 17 | |||
| 18 | namespace boost { | ||
| 19 | namespace buffers { | ||
| 20 | |||
| 21 | /** Holds a buffer that can be modified. | ||
| 22 | */ | ||
| 23 | class mutable_buffer | ||
| 24 | { | ||
| 25 | unsigned char* p_ = nullptr; | ||
| 26 | std::size_t n_ = 0; | ||
| 27 | |||
| 28 | public: | ||
| 29 | using value_type = mutable_buffer; | ||
| 30 | using const_iterator = | ||
| 31 | value_type const*; | ||
| 32 | |||
| 33 | /** Constructor. | ||
| 34 | */ | ||
| 35 | 545 | mutable_buffer() = default; | |
| 36 | |||
| 37 | /** Constructor. | ||
| 38 | */ | ||
| 39 | mutable_buffer( | ||
| 40 | mutable_buffer const&) = default; | ||
| 41 | |||
| 42 | /** Constructor. | ||
| 43 | */ | ||
| 44 | 641015 | mutable_buffer( | |
| 45 | void* data, | ||
| 46 | std::size_t size) noexcept | ||
| 47 | 641015 | : p_(static_cast< | |
| 48 | unsigned char*>(data)) | ||
| 49 | 641015 | , n_(size) | |
| 50 | { | ||
| 51 | 641015 | } | |
| 52 | |||
| 53 | /** Assignment. | ||
| 54 | */ | ||
| 55 | mutable_buffer& operator=( | ||
| 56 | mutable_buffer const&) = default; | ||
| 57 | |||
| 58 | // conversion to boost::asio::mutable_buffer | ||
| 59 | template< | ||
| 60 | class T | ||
| 61 | , class = typename std::enable_if< | ||
| 62 | std::is_constructible<T, | ||
| 63 | void*, std::size_t>::value | ||
| 64 | && ! std::is_same<T, mutable_buffer>::value | ||
| 65 | //&& ! std::is_same<T, const_buffer>::value | ||
| 66 | >::type | ||
| 67 | > | ||
| 68 | 4 | operator T() const noexcept | |
| 69 | { | ||
| 70 | 4 | return T{ data(), size() }; | |
| 71 | } | ||
| 72 | |||
| 73 | void* | ||
| 74 | 813742 | data() const noexcept | |
| 75 | { | ||
| 76 | 813742 | return p_; | |
| 77 | } | ||
| 78 | |||
| 79 | std::size_t | ||
| 80 | 1695793 | size() const noexcept | |
| 81 | { | ||
| 82 | 1695793 | return n_; | |
| 83 | } | ||
| 84 | |||
| 85 | const_iterator | ||
| 86 | begin() const noexcept | ||
| 87 | { | ||
| 88 | return this; | ||
| 89 | } | ||
| 90 | |||
| 91 | const_iterator | ||
| 92 | end() const noexcept | ||
| 93 | { | ||
| 94 | return this + 1; | ||
| 95 | } | ||
| 96 | |||
| 97 | /** Remove a prefix from the buffer. | ||
| 98 | */ | ||
| 99 | mutable_buffer& | ||
| 100 | 827333 | operator+=(std::size_t n) noexcept | |
| 101 | { | ||
| 102 |
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827333 | if(n >= n_) |
| 103 | { | ||
| 104 | 23303 | p_ = p_ + n_; | |
| 105 | 23303 | n_ = 0; | |
| 106 | 23303 | return *this; | |
| 107 | } | ||
| 108 | 804030 | p_ = p_ + n; | |
| 109 | 804030 | n_ -= n; | |
| 110 | 804030 | return *this; | |
| 111 | } | ||
| 112 | |||
| 113 | /** Return the buffer with a prefix removed. | ||
| 114 | */ | ||
| 115 | friend | ||
| 116 | mutable_buffer | ||
| 117 | 827298 | operator+( | |
| 118 | mutable_buffer b, | ||
| 119 | std::size_t n) noexcept | ||
| 120 | { | ||
| 121 | 827298 | return b += n; | |
| 122 | } | ||
| 123 | |||
| 124 | /** Return the buffer with a prefix removed. | ||
| 125 | */ | ||
| 126 | friend | ||
| 127 | mutable_buffer | ||
| 128 | 1 | operator+( | |
| 129 | std::size_t n, | ||
| 130 | mutable_buffer b) noexcept | ||
| 131 | { | ||
| 132 | 1 | return b += n; | |
| 133 | } | ||
| 134 | |||
| 135 | friend | ||
| 136 | mutable_buffer | ||
| 137 | 733 | tag_invoke( | |
| 138 | prefix_tag const&, | ||
| 139 | mutable_buffer const& b, | ||
| 140 | std::size_t n) noexcept | ||
| 141 | { | ||
| 142 |
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733 | if(n < b.size()) |
| 143 | 409 | return { b.p_, n }; | |
| 144 | 324 | return b; | |
| 145 | } | ||
| 146 | |||
| 147 | friend | ||
| 148 | mutable_buffer | ||
| 149 | 733 | tag_invoke( | |
| 150 | suffix_tag const&, | ||
| 151 | mutable_buffer const& b, | ||
| 152 | std::size_t n) noexcept | ||
| 153 | { | ||
| 154 |
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733 | if(n < b.size()) |
| 155 | 287 | return { b.p_ + b.n_ - n, n }; | |
| 156 | 446 | return b; | |
| 157 | } | ||
| 158 | }; | ||
| 159 | |||
| 160 | } // buffers | ||
| 161 | } // boost | ||
| 162 | |||
| 163 | #endif | ||
| 164 |