| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2019 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/http_proto | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_HTTP_PROTO_DETAIL_WORKSPACE_HPP | ||
| 11 | #define BOOST_HTTP_PROTO_DETAIL_WORKSPACE_HPP | ||
| 12 | |||
| 13 | #include <boost/http_proto/detail/except.hpp> | ||
| 14 | #include <boost/assert.hpp> | ||
| 15 | #include <cstdlib> | ||
| 16 | #include <new> | ||
| 17 | #include <utility> | ||
| 18 | #include <stddef.h> // ::max_align_t | ||
| 19 | |||
| 20 | namespace boost { | ||
| 21 | namespace http_proto { | ||
| 22 | namespace detail { | ||
| 23 | |||
| 24 | class workspace | ||
| 25 | { | ||
| 26 | 74 | struct any | |
| 27 | { | ||
| 28 | any* next = nullptr; | ||
| 29 | |||
| 30 | BOOST_HTTP_PROTO_DECL | ||
| 31 | virtual ~any() = 0; | ||
| 32 | }; | ||
| 33 | |||
| 34 | unsigned char* begin_ = nullptr; | ||
| 35 | unsigned char* end_; | ||
| 36 | unsigned char* head_; | ||
| 37 | |||
| 38 | public: | ||
| 39 | ~workspace(); | ||
| 40 | |||
| 41 | 744 | workspace() = default; | |
| 42 | workspace(workspace&&) noexcept; | ||
| 43 | workspace& operator=( | ||
| 44 | workspace&&) noexcept; | ||
| 45 | |||
| 46 | explicit | ||
| 47 | workspace( | ||
| 48 | std::size_t n); | ||
| 49 | |||
| 50 | void* | ||
| 51 | 7523 | data() noexcept | |
| 52 | { | ||
| 53 | 7523 | return begin_; | |
| 54 | } | ||
| 55 | |||
| 56 | std::size_t | ||
| 57 | 14 | size() const noexcept | |
| 58 | { | ||
| 59 | 14 | return head_ - begin_; | |
| 60 | } | ||
| 61 | |||
| 62 | BOOST_HTTP_PROTO_DECL | ||
| 63 | void | ||
| 64 | clear() noexcept; | ||
| 65 | |||
| 66 | BOOST_HTTP_PROTO_DECL | ||
| 67 | void* | ||
| 68 | reserve(std::size_t n); | ||
| 69 | |||
| 70 | template<class T> | ||
| 71 | auto | ||
| 72 | push(T&& t) -> | ||
| 73 | typename std::decay<T>::type&; | ||
| 74 | |||
| 75 | template<class T> | ||
| 76 | T* | ||
| 77 | push_array( | ||
| 78 | std::size_t n, | ||
| 79 | T const& t); | ||
| 80 | |||
| 81 | private: | ||
| 82 | BOOST_HTTP_PROTO_DECL | ||
| 83 | void* | ||
| 84 | bump_down( | ||
| 85 | std::size_t size, | ||
| 86 | std::size_t align); | ||
| 87 | }; | ||
| 88 | |||
| 89 | template<class T> | ||
| 90 | auto | ||
| 91 | 26 | workspace:: | |
| 92 | push(T&& t) -> | ||
| 93 | typename std::decay<T>::type& | ||
| 94 | { | ||
| 95 | struct alignas(alignof(::max_align_t)) | ||
| 96 | U : any | ||
| 97 | { | ||
| 98 | typename std::decay<T>::type v_; | ||
| 99 | |||
| 100 | U() = delete; | ||
| 101 | U(U&&) = default; | ||
| 102 | |||
| 103 | 13 | explicit U(T&& t) | |
| 104 | 13 | : v_(std::move(t)) | |
| 105 | { | ||
| 106 | } | ||
| 107 | }; | ||
| 108 | |||
| 109 | 26 | auto p = ::new(bump_down( | |
| 110 | sizeof(U), alignof(U))) U( | ||
| 111 | 26 | std::forward<T>(t)); | |
| 112 | 26 | p->next = reinterpret_cast< | |
| 113 | 26 | any*>(head_); | |
| 114 | 26 | head_ = reinterpret_cast< | |
| 115 | unsigned char*>(p); | ||
| 116 | 26 | return p->v_; | |
| 117 | } | ||
| 118 | |||
| 119 | template<class T> | ||
| 120 | T* | ||
| 121 | 24 | workspace:: | |
| 122 | push_array( | ||
| 123 | std::size_t n, | ||
| 124 | T const& t) | ||
| 125 | { | ||
| 126 | struct alignas(alignof(::max_align_t)) | ||
| 127 | 24 | U : any | |
| 128 | { | ||
| 129 | std::size_t n_ = 0; | ||
| 130 | |||
| 131 | U() = default; | ||
| 132 | 48 | ~U() | |
| 133 | { | ||
| 134 | 140 | for(std::size_t i = n_; | |
| 135 |
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140 | i-- > 0;) |
| 136 | 92 | data()[i].~T(); | |
| 137 | } | ||
| 138 | |||
| 139 | 24 | U( std::size_t n, | |
| 140 | T const& t) | ||
| 141 | 24 | : U() | |
| 142 | { | ||
| 143 |
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70 | while(n_ < n) |
| 144 | { | ||
| 145 | 46 | new(&data()[n_]) T(t); | |
| 146 | 46 | ++n_; | |
| 147 | } | ||
| 148 | 24 | } | |
| 149 | |||
| 150 | 116 | T* data() noexcept | |
| 151 | { | ||
| 152 | return reinterpret_cast< | ||
| 153 | 116 | T*>(this + 1); | |
| 154 | } | ||
| 155 | }; | ||
| 156 | |||
| 157 | 24 | auto p = ::new(bump_down( | |
| 158 | 24 | sizeof(U) + n * sizeof(T), | |
| 159 | alignof(::max_align_t))) U(n, t); | ||
| 160 | 24 | p->next = reinterpret_cast< | |
| 161 | 24 | any*>(head_); | |
| 162 | 24 | head_ = reinterpret_cast< | |
| 163 | unsigned char*>(p); | ||
| 164 | 24 | return p->data(); | |
| 165 | } | ||
| 166 | |||
| 167 | } // detail | ||
| 168 | } // http_proto | ||
| 169 | } // boost | ||
| 170 | |||
| 171 | #endif | ||
| 172 |