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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_ALGORITHM_HPP | ||
| 11 | #define BOOST_BUFFERS_ALGORITHM_HPP | ||
| 12 | |||
| 13 | #include <boost/buffers/detail/config.hpp> | ||
| 14 | #include <boost/buffers/buffer_size.hpp> | ||
| 15 | #include <boost/buffers/const_buffer.hpp> | ||
| 16 | #include <boost/buffers/mutable_buffer.hpp> | ||
| 17 | #include <boost/buffers/range.hpp> | ||
| 18 | #include <boost/buffers/tag_invoke.hpp> | ||
| 19 | #include <boost/buffers/type_traits.hpp> | ||
| 20 | |||
| 21 | namespace boost { | ||
| 22 | namespace buffers { | ||
| 23 | |||
| 24 | template<class BufferSequence> | ||
| 25 | void | ||
| 26 | tag_invoke( | ||
| 27 | prefix_tag const&, | ||
| 28 | BufferSequence const&, | ||
| 29 | std::size_t) = delete; | ||
| 30 | |||
| 31 | template<class BufferSequence> | ||
| 32 | void | ||
| 33 | tag_invoke( | ||
| 34 | suffix_tag const&, | ||
| 35 | BufferSequence const&, | ||
| 36 | std::size_t) = delete; | ||
| 37 | |||
| 38 | /** Returns the type of a prefix of a buffer sequence. | ||
| 39 | */ | ||
| 40 | template<class BufferSequence> | ||
| 41 | using prefix_type = decltype( | ||
| 42 | tag_invoke( | ||
| 43 | prefix_tag{}, | ||
| 44 | std::declval<BufferSequence const&>(), | ||
| 45 | std::size_t{})); | ||
| 46 | |||
| 47 | /** Returns the type of a suffix of a buffer sequence. | ||
| 48 | */ | ||
| 49 | template<class BufferSequence> | ||
| 50 | using suffix_type = decltype( | ||
| 51 | tag_invoke( | ||
| 52 | suffix_tag{}, | ||
| 53 | std::declval<BufferSequence const&>(), | ||
| 54 | std::size_t{})); | ||
| 55 | |||
| 56 | namespace detail { | ||
| 57 | |||
| 58 | struct prefix_impl | ||
| 59 | { | ||
| 60 | template<class BufferSequence> | ||
| 61 | prefix_type<BufferSequence> | ||
| 62 | 528670 | operator()( | |
| 63 | BufferSequence const& b, | ||
| 64 | std::size_t n) const | ||
| 65 | { | ||
| 66 | static_assert( | ||
| 67 | is_const_buffer_sequence< | ||
| 68 | BufferSequence>::value, | ||
| 69 | "Type requirements not met"); | ||
| 70 | |||
| 71 | 1057340 | return tag_invoke( | |
| 72 | 528670 | prefix_tag{}, b, n); | |
| 73 | } | ||
| 74 | }; | ||
| 75 | |||
| 76 | struct sans_suffix_impl | ||
| 77 | { | ||
| 78 | template<class BufferSequence> | ||
| 79 | prefix_type<BufferSequence> | ||
| 80 | 516 | operator()( | |
| 81 | BufferSequence const& b, | ||
| 82 | std::size_t n) const | ||
| 83 | { | ||
| 84 | 516 | auto const n0 = buffer_size(b); | |
| 85 |
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516 | if(n < n0) |
| 86 | 968 | return tag_invoke( | |
| 87 | 484 | prefix_tag{}, b, n0 - n); | |
| 88 | 64 | return tag_invoke( | |
| 89 | 32 | prefix_tag{}, b, 0); | |
| 90 | } | ||
| 91 | }; | ||
| 92 | |||
| 93 | struct suffix_impl | ||
| 94 | { | ||
| 95 | template<class BufferSequence> | ||
| 96 | suffix_type<BufferSequence> | ||
| 97 | 280608 | operator()( | |
| 98 | BufferSequence const& b, | ||
| 99 | std::size_t n) const | ||
| 100 | { | ||
| 101 | static_assert( | ||
| 102 | is_const_buffer_sequence< | ||
| 103 | BufferSequence>::value, | ||
| 104 | "Type requirements not met"); | ||
| 105 | |||
| 106 | 561216 | return tag_invoke( | |
| 107 | 280608 | suffix_tag{}, b, n); | |
| 108 | } | ||
| 109 | }; | ||
| 110 | |||
| 111 | struct sans_prefix_impl | ||
| 112 | { | ||
| 113 | template<class BufferSequence> | ||
| 114 | suffix_type<BufferSequence> | ||
| 115 | 280468 | operator()( | |
| 116 | BufferSequence const& b, | ||
| 117 | std::size_t n) const | ||
| 118 | { | ||
| 119 | static_assert( | ||
| 120 | is_const_buffer_sequence< | ||
| 121 | BufferSequence>::value, | ||
| 122 | "Type requirements not met"); | ||
| 123 | |||
| 124 | 280468 | auto const n0 = buffer_size(b); | |
| 125 |
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280468 | if(n < n0) |
| 126 | 560868 | return tag_invoke( | |
| 127 | 280434 | suffix_tag{}, b, n0 - n); | |
| 128 | 68 | return tag_invoke( | |
| 129 | 34 | suffix_tag{}, b, 0); | |
| 130 | } | ||
| 131 | }; | ||
| 132 | |||
| 133 | struct front_impl | ||
| 134 | { | ||
| 135 | template< | ||
| 136 | class MutableBufferSequence | ||
| 137 | , class = typename std::enable_if< | ||
| 138 | is_mutable_buffer_sequence< | ||
| 139 | MutableBufferSequence>::value | ||
| 140 | >::type> | ||
| 141 | mutable_buffer | ||
| 142 | operator()( | ||
| 143 | MutableBufferSequence const& bs) const noexcept | ||
| 144 | { | ||
| 145 | auto const it = begin(bs); | ||
| 146 | if(it != end(bs)) | ||
| 147 | return *it; | ||
| 148 | return {}; | ||
| 149 | } | ||
| 150 | |||
| 151 | template< | ||
| 152 | class ConstBufferSequence | ||
| 153 | , class = typename std::enable_if< | ||
| 154 | ! is_mutable_buffer_sequence< | ||
| 155 | ConstBufferSequence>::value | ||
| 156 | >::type> | ||
| 157 | const_buffer | ||
| 158 | operator()( | ||
| 159 | ConstBufferSequence const& bs) const noexcept | ||
| 160 | { | ||
| 161 | static_assert( | ||
| 162 | is_const_buffer_sequence< | ||
| 163 | ConstBufferSequence>::value, | ||
| 164 | "Type requirements not met"); | ||
| 165 | |||
| 166 | auto const it = bs.begin(); | ||
| 167 | if(it != bs.end()) | ||
| 168 | return *it; | ||
| 169 | return {}; | ||
| 170 | } | ||
| 171 | }; | ||
| 172 | |||
| 173 | } // detail | ||
| 174 | |||
| 175 | /** Return a prefix of the buffer sequence. | ||
| 176 | */ | ||
| 177 | constexpr detail::prefix_impl prefix{}; | ||
| 178 | |||
| 179 | /** Return a suffix of the buffer sequence. | ||
| 180 | */ | ||
| 181 | constexpr detail::suffix_impl suffix{}; | ||
| 182 | |||
| 183 | /** Return a suffix of the buffer sequence. | ||
| 184 | */ | ||
| 185 | constexpr detail::sans_prefix_impl sans_prefix{}; | ||
| 186 | |||
| 187 | /** Return a prefix of the buffer sequence. | ||
| 188 | */ | ||
| 189 | constexpr detail::sans_suffix_impl sans_suffix{}; | ||
| 190 | |||
| 191 | /** Return the first buffer in a sequence. | ||
| 192 | */ | ||
| 193 | constexpr detail::front_impl front{}; | ||
| 194 | |||
| 195 | } // buffers | ||
| 196 | } // boost | ||
| 197 | |||
| 198 | #endif | ||
| 199 |