| 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_IMPL_WORKSPACE_HPP | ||
| 11 | #define BOOST_HTTP_PROTO_DETAIL_IMPL_WORKSPACE_HPP | ||
| 12 | |||
| 13 | namespace boost { | ||
| 14 | namespace http_proto { | ||
| 15 | namespace detail { | ||
| 16 | |||
| 17 | 672 | struct workspace::any | |
| 18 | { | ||
| 19 | any* next = nullptr; | ||
| 20 | |||
| 21 | BOOST_HTTP_PROTO_DECL | ||
| 22 | virtual ~any() = 0; | ||
| 23 | }; | ||
| 24 | |||
| 25 | template<class U> | ||
| 26 | struct alignas(alignof(::max_align_t)) | ||
| 27 | workspace::any_impl : any | ||
| 28 | { | ||
| 29 | U u; | ||
| 30 | |||
| 31 | any_impl() = delete; | ||
| 32 | any_impl(any_impl&&) = default; | ||
| 33 | |||
| 34 | template<class U_> | ||
| 35 | 624 | explicit any_impl(U_&& u_) | |
| 36 | 624 | : u(std::move(u_)) | |
| 37 | { | ||
| 38 | 624 | } | |
| 39 | }; | ||
| 40 | |||
| 41 | struct workspace::undo | ||
| 42 | { | ||
| 43 | explicit | ||
| 44 | 336 | undo(workspace& ws0) noexcept | |
| 45 | 336 | : ws_(ws0) | |
| 46 | 336 | , head_(ws0.head_) | |
| 47 | { | ||
| 48 | 336 | } | |
| 49 | |||
| 50 | 336 | ~undo() | |
| 51 | 336 | { | |
| 52 |
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336 | if(head_) |
| 53 | ✗ | ws_.head_ = head_; | |
| 54 | 336 | } | |
| 55 | |||
| 56 | void | ||
| 57 | 336 | commit() noexcept | |
| 58 | { | ||
| 59 | 336 | head_ = nullptr; | |
| 60 | 336 | } | |
| 61 | |||
| 62 | private: | ||
| 63 | workspace& ws_; | ||
| 64 | unsigned char* head_; | ||
| 65 | }; | ||
| 66 | |||
| 67 | template<class T> | ||
| 68 | constexpr | ||
| 69 | std::size_t | ||
| 70 | workspace:: | ||
| 71 | space_needed() | ||
| 72 | { | ||
| 73 | using U = typename std::decay<T>::type; | ||
| 74 | |||
| 75 | static_assert( | ||
| 76 | alignof(U) <= alignof(::max_align_t), | ||
| 77 | "Overaligned types not supported"); | ||
| 78 | |||
| 79 | return sizeof(any_impl<U>); | ||
| 80 | } | ||
| 81 | |||
| 82 | template<class T> | ||
| 83 | auto | ||
| 84 | 325 | workspace:: | |
| 85 | push(T&& t) -> | ||
| 86 | typename std::decay<T>::type& | ||
| 87 | { | ||
| 88 | static_assert( | ||
| 89 | alignof(T) <= alignof(::max_align_t), | ||
| 90 | "Overaligned types not supported"); | ||
| 91 | |||
| 92 | using U = any_impl<typename | ||
| 93 | std::decay<T>::type>; | ||
| 94 | |||
| 95 | 325 | undo u(*this); | |
| 96 |
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325 | auto p = ::new(bump_down( |
| 97 | sizeof(U), alignof(U))) U( | ||
| 98 | 325 | std::forward<T>(t)); | |
| 99 | 325 | u.commit(); | |
| 100 | 325 | p->next = reinterpret_cast< | |
| 101 | 325 | any*>(head_); | |
| 102 | 325 | head_ = reinterpret_cast< | |
| 103 | unsigned char*>(p); | ||
| 104 | 650 | return p->u; | |
| 105 | } | ||
| 106 | |||
| 107 | template<class T> | ||
| 108 | T* | ||
| 109 | 24 | workspace:: | |
| 110 | push_array( | ||
| 111 | std::size_t n, | ||
| 112 | T const& t) | ||
| 113 | { | ||
| 114 | struct alignas(alignof(::max_align_t)) | ||
| 115 | 24 | U : any | |
| 116 | { | ||
| 117 | std::size_t n_ = 0; | ||
| 118 | |||
| 119 | U() = default; | ||
| 120 | 48 | ~U() | |
| 121 | { | ||
| 122 | 140 | for(std::size_t i = n_; | |
| 123 |
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140 | i-- > 0;) |
| 124 | 92 | data()[i].~T(); | |
| 125 | 96 | } | |
| 126 | |||
| 127 | 24 | U( std::size_t n, | |
| 128 | T const& t) | ||
| 129 | 24 | : U() | |
| 130 | { | ||
| 131 |
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70 | while(n_ < n) |
| 132 | { | ||
| 133 | 46 | new(&data()[n_]) T(t); | |
| 134 | 46 | ++n_; | |
| 135 | } | ||
| 136 | 24 | } | |
| 137 | |||
| 138 | 116 | T* data() noexcept | |
| 139 | { | ||
| 140 | return reinterpret_cast< | ||
| 141 | 116 | T*>(this + 1); | |
| 142 | } | ||
| 143 | }; | ||
| 144 | |||
| 145 | 48 | undo u(*this); | |
| 146 | 24 | auto p = ::new(bump_down( | |
| 147 |
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24 | sizeof(U) + n * sizeof(T), |
| 148 | alignof(::max_align_t))) U(n, t); | ||
| 149 | 24 | u.commit(); | |
| 150 | 24 | p->next = reinterpret_cast< | |
| 151 | 24 | any*>(head_); | |
| 152 | 24 | head_ = reinterpret_cast< | |
| 153 | unsigned char*>(p); | ||
| 154 | 48 | return p->data(); | |
| 155 | } | ||
| 156 | |||
| 157 | } // detail | ||
| 158 | } // http_proto | ||
| 159 | } // boost | ||
| 160 | |||
| 161 | #endif | ||
| 162 |