| 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 | /** A contiguous buffer of storage used by algorithms. | ||
| 25 | |||
| 26 | Objects of this type retain ownership of a | ||
| 27 | contiguous buffer of storage allocated upon | ||
| 28 | construction. This storage is divided into | ||
| 29 | three regions: | ||
| 30 | |||
| 31 | @li The reserved area, which starts at the | ||
| 32 | beginning of the buffer and can grow | ||
| 33 | upwards towards the end of the buffer. | ||
| 34 | |||
| 35 | @li The acquired area, which starts at the | ||
| 36 | end of the buffer and can grow downwards | ||
| 37 | towards the beginning of the buffer. | ||
| 38 | |||
| 39 | @li The unused area, which starts from the | ||
| 40 | end of the reserved area and stretches | ||
| 41 | until the beginning of the acquired area. | ||
| 42 | */ | ||
| 43 | class workspace | ||
| 44 | { | ||
| 45 | unsigned char* base_ = nullptr; | ||
| 46 | unsigned char* begin_ = nullptr; | ||
| 47 | unsigned char* head_ = nullptr; | ||
| 48 | unsigned char* end_ = nullptr; | ||
| 49 | |||
| 50 | template<class> | ||
| 51 | struct any_impl; | ||
| 52 | struct any; | ||
| 53 | struct undo; | ||
| 54 | |||
| 55 | public: | ||
| 56 | /** Return the number of aligned bytes required for T | ||
| 57 | */ | ||
| 58 | template<class T> | ||
| 59 | static | ||
| 60 | constexpr | ||
| 61 | std::size_t | ||
| 62 | space_needed(); | ||
| 63 | |||
| 64 | /** Destructor. | ||
| 65 | */ | ||
| 66 | ~workspace(); | ||
| 67 | |||
| 68 | /** Constructor. | ||
| 69 | |||
| 70 | @param n The number of bytes of storage | ||
| 71 | to allocate for the internal buffer. | ||
| 72 | */ | ||
| 73 | explicit | ||
| 74 | workspace( | ||
| 75 | std::size_t n); | ||
| 76 | |||
| 77 | /** Constructor. | ||
| 78 | */ | ||
| 79 | 745 | workspace() = default; | |
| 80 | |||
| 81 | /** Constructor. | ||
| 82 | */ | ||
| 83 | workspace(workspace&&) noexcept; | ||
| 84 | |||
| 85 | /** Allocate internal storage. | ||
| 86 | |||
| 87 | @throws std::logic_error this->size() > 0 | ||
| 88 | |||
| 89 | @throws std::invalid_argument n == 0 | ||
| 90 | */ | ||
| 91 | void | ||
| 92 | allocate( | ||
| 93 | std::size_t n); | ||
| 94 | |||
| 95 | /** Return a pointer to the unused area. | ||
| 96 | */ | ||
| 97 | void* | ||
| 98 | 7958 | data() noexcept | |
| 99 | { | ||
| 100 | 7958 | return begin_; | |
| 101 | } | ||
| 102 | |||
| 103 | /** Return the size of the unused area. | ||
| 104 | */ | ||
| 105 | std::size_t | ||
| 106 | 20 | size() const noexcept | |
| 107 | { | ||
| 108 | 20 | return head_ - begin_; | |
| 109 | } | ||
| 110 | |||
| 111 | /** Clear the contents while preserving capacity. | ||
| 112 | */ | ||
| 113 | BOOST_HTTP_PROTO_DECL | ||
| 114 | void | ||
| 115 | clear() noexcept; | ||
| 116 | |||
| 117 | /** Convert unused storage to reserved storage. | ||
| 118 | |||
| 119 | @throws std::invalid_argument n >= this->size() | ||
| 120 | */ | ||
| 121 | BOOST_HTTP_PROTO_DECL | ||
| 122 | void | ||
| 123 | reserve(std::size_t n); | ||
| 124 | |||
| 125 | template<class T> | ||
| 126 | typename std::decay<T>::type& | ||
| 127 | push(T&& t); | ||
| 128 | |||
| 129 | template<class T> | ||
| 130 | T* | ||
| 131 | push_array( | ||
| 132 | std::size_t n, | ||
| 133 | T const& t); | ||
| 134 | |||
| 135 | private: | ||
| 136 | BOOST_HTTP_PROTO_DECL | ||
| 137 | void* | ||
| 138 | bump_down( | ||
| 139 | std::size_t size, | ||
| 140 | std::size_t align); | ||
| 141 | }; | ||
| 142 | |||
| 143 | } // detail | ||
| 144 | } // http_proto | ||
| 145 | } // boost | ||
| 146 | |||
| 147 | #include <boost/http_proto/detail/impl/workspace.hpp> | ||
| 148 | |||
| 149 | #endif | ||
| 150 |