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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_CONST_BUFFER_HPP | ||
| 11 | #define BOOST_BUFFERS_CONST_BUFFER_HPP | ||
| 12 | |||
| 13 | #include <boost/buffers/detail/config.hpp> | ||
| 14 | #include <boost/buffers/mutable_buffer.hpp> | ||
| 15 | |||
| 16 | namespace boost { | ||
| 17 | namespace buffers { | ||
| 18 | |||
| 19 | /** Holds a buffer that cannot be modified. | ||
| 20 | */ | ||
| 21 | class const_buffer | ||
| 22 | { | ||
| 23 | unsigned char const* p_ = nullptr; | ||
| 24 | std::size_t n_ = 0; | ||
| 25 | |||
| 26 | public: | ||
| 27 | /** Constructor. | ||
| 28 | */ | ||
| 29 | 139809 | const_buffer() = default; | |
| 30 | |||
| 31 | /** Constructor. | ||
| 32 | */ | ||
| 33 | 690360 | const_buffer( | |
| 34 | void const* data, | ||
| 35 | std::size_t size) noexcept | ||
| 36 | 690360 | : p_(static_cast< | |
| 37 | unsigned char const*>(data)) | ||
| 38 | 690360 | , n_(size) | |
| 39 | { | ||
| 40 | 690360 | } | |
| 41 | |||
| 42 | /** Constructor. | ||
| 43 | */ | ||
| 44 | const_buffer( | ||
| 45 | const_buffer const&) = default; | ||
| 46 | |||
| 47 | /** Constructor. | ||
| 48 | */ | ||
| 49 | 9165 | const_buffer( | |
| 50 | mutable_buffer const& b) noexcept | ||
| 51 | 18330 | : p_(static_cast< | |
| 52 | 9165 | unsigned char const*>(b.data())) | |
| 53 | 9165 | , n_(b.size()) | |
| 54 | { | ||
| 55 | 9165 | } | |
| 56 | |||
| 57 | /** Assignment. | ||
| 58 | */ | ||
| 59 | const_buffer& operator=( | ||
| 60 | const_buffer const&) = default; | ||
| 61 | |||
| 62 | // conversion to boost::asio::const_buffer | ||
| 63 | template< | ||
| 64 | class T | ||
| 65 | , class = typename std::enable_if< | ||
| 66 | std::is_constructible<T, | ||
| 67 | void const*, std::size_t>::value && | ||
| 68 | ! std::is_same<T, mutable_buffer>::value && | ||
| 69 | ! std::is_same<T, const_buffer>::value | ||
| 70 | >::type | ||
| 71 | > | ||
| 72 | operator T() const noexcept | ||
| 73 | { | ||
| 74 | return T{ data(), size() }; | ||
| 75 | } | ||
| 76 | |||
| 77 | void const* | ||
| 78 | 1388148 | data() const noexcept | |
| 79 | { | ||
| 80 | 1388148 | return p_; | |
| 81 | } | ||
| 82 | |||
| 83 | std::size_t | ||
| 84 | 5324384 | size() const noexcept | |
| 85 | { | ||
| 86 | 5324384 | return n_; | |
| 87 | } | ||
| 88 | |||
| 89 | /** Remove a prefix from the buffer. | ||
| 90 | */ | ||
| 91 | const_buffer& | ||
| 92 | 950181 | operator+=(std::size_t n) noexcept | |
| 93 | { | ||
| 94 |
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950181 | if(n >= n_) |
| 95 | { | ||
| 96 | 26302 | p_ = p_ + n_; | |
| 97 | 26302 | n_ = 0; | |
| 98 | 26302 | return *this; | |
| 99 | } | ||
| 100 | 923879 | p_ = p_ + n; | |
| 101 | 923879 | n_ -= n; | |
| 102 | 923879 | return *this; | |
| 103 | } | ||
| 104 | |||
| 105 | /** Return the buffer with a prefix removed. | ||
| 106 | */ | ||
| 107 | friend | ||
| 108 | const_buffer | ||
| 109 | 950178 | operator+( | |
| 110 | const_buffer b, | ||
| 111 | std::size_t n) noexcept | ||
| 112 | { | ||
| 113 | 950178 | return b += n; | |
| 114 | } | ||
| 115 | |||
| 116 | /** Return the buffer with a prefix removed. | ||
| 117 | */ | ||
| 118 | friend | ||
| 119 | const_buffer | ||
| 120 | 1 | operator+( | |
| 121 | std::size_t n, | ||
| 122 | const_buffer b) noexcept | ||
| 123 | { | ||
| 124 | 1 | return b += n; | |
| 125 | } | ||
| 126 | |||
| 127 | friend | ||
| 128 | const_buffer | ||
| 129 | 246621 | tag_invoke( | |
| 130 | prefix_tag const&, | ||
| 131 | const_buffer const& b, | ||
| 132 | std::size_t n) noexcept | ||
| 133 | { | ||
| 134 |
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246621 | if(n < b.size()) |
| 135 | 81945 | return { b.data(), n }; | |
| 136 | 164676 | return b; | |
| 137 | } | ||
| 138 | |||
| 139 | friend | ||
| 140 | const_buffer | ||
| 141 | 279261 | tag_invoke( | |
| 142 | suffix_tag const&, | ||
| 143 | const_buffer const& b, | ||
| 144 | std::size_t n) noexcept | ||
| 145 | { | ||
| 146 | 279261 | auto const n0 = b.size(); | |
| 147 |
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279261 | if(n < n0) |
| 148 | 135583 | return { b.p_ + (n0 - n), n }; | |
| 149 | 143678 | return b; | |
| 150 | } | ||
| 151 | }; | ||
| 152 | |||
| 153 | } // buffers | ||
| 154 | } // boost | ||
| 155 | |||
| 156 | #endif | ||
| 157 |