| 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 | @code | ||
| 32 | | front | free | acquired | back | | ||
| 33 | @endcode | ||
| 34 | |||
| 35 | @li The reserved area, which starts at the | ||
| 36 | beginning of the buffer and can grow | ||
| 37 | upwards towards the end of the buffer. | ||
| 38 | |||
| 39 | @li The acquired area, which starts at the | ||
| 40 | end of the buffer and can grow downwards | ||
| 41 | towards the beginning of the buffer. | ||
| 42 | |||
| 43 | @li The unused area, which starts from the | ||
| 44 | end of the reserved area and stretches | ||
| 45 | until the beginning of the acquired area. | ||
| 46 | */ | ||
| 47 | class workspace | ||
| 48 | { | ||
| 49 | unsigned char* begin_ = nullptr; | ||
| 50 | unsigned char* front_ = nullptr; | ||
| 51 | unsigned char* head_ = nullptr; | ||
| 52 | unsigned char* back_ = nullptr; | ||
| 53 | unsigned char* end_ = nullptr; | ||
| 54 | |||
| 55 | template<class> | ||
| 56 | struct any_impl; | ||
| 57 | struct any; | ||
| 58 | struct undo; | ||
| 59 | |||
| 60 | public: | ||
| 61 | /** Return the number of aligned bytes required for T | ||
| 62 | */ | ||
| 63 | template<class T> | ||
| 64 | static | ||
| 65 | constexpr | ||
| 66 | std::size_t | ||
| 67 | space_needed(); | ||
| 68 | |||
| 69 | /** Destructor. | ||
| 70 | */ | ||
| 71 | ~workspace(); | ||
| 72 | |||
| 73 | /** Constructor. | ||
| 74 | |||
| 75 | @param n The number of bytes of storage | ||
| 76 | to allocate for the internal buffer. | ||
| 77 | */ | ||
| 78 | explicit | ||
| 79 | workspace( | ||
| 80 | std::size_t n); | ||
| 81 | |||
| 82 | /** Constructor. | ||
| 83 | */ | ||
| 84 | 1045 | workspace() = default; | |
| 85 | |||
| 86 | /** Constructor. | ||
| 87 | */ | ||
| 88 | workspace(workspace&&) noexcept; | ||
| 89 | |||
| 90 | /** Allocate internal storage. | ||
| 91 | |||
| 92 | @throws std::logic_error this->size() > 0 | ||
| 93 | |||
| 94 | @throws std::invalid_argument n == 0 | ||
| 95 | */ | ||
| 96 | void | ||
| 97 | allocate( | ||
| 98 | std::size_t n); | ||
| 99 | |||
| 100 | /** Return a pointer to the unused area. | ||
| 101 | */ | ||
| 102 | unsigned char* | ||
| 103 | 16398 | data() noexcept | |
| 104 | { | ||
| 105 | 16398 | return front_; | |
| 106 | } | ||
| 107 | |||
| 108 | /** Return the size of the unused area. | ||
| 109 | */ | ||
| 110 | std::size_t | ||
| 111 | 4126 | size() const noexcept | |
| 112 | { | ||
| 113 | 4126 | return head_ - front_; | |
| 114 | } | ||
| 115 | |||
| 116 | /** Clear the contents while preserving capacity. | ||
| 117 | */ | ||
| 118 | BOOST_HTTP_PROTO_DECL | ||
| 119 | void | ||
| 120 | clear() noexcept; | ||
| 121 | |||
| 122 | /** Convert unused storage to reserved storage. | ||
| 123 | |||
| 124 | @throws std::invalid_argument n >= this->size() | ||
| 125 | */ | ||
| 126 | BOOST_HTTP_PROTO_DECL | ||
| 127 | unsigned char* | ||
| 128 | reserve_front( | ||
| 129 | std::size_t n); | ||
| 130 | |||
| 131 | template<class T, class... Args> | ||
| 132 | typename std::decay<T>::type& | ||
| 133 | emplace(Args&&... args); | ||
| 134 | |||
| 135 | template<class T> | ||
| 136 | T* | ||
| 137 | push_array( | ||
| 138 | std::size_t n, | ||
| 139 | T const& t); | ||
| 140 | |||
| 141 | BOOST_HTTP_PROTO_DECL | ||
| 142 | unsigned char* | ||
| 143 | reserve_back( | ||
| 144 | std::size_t n); | ||
| 145 | |||
| 146 | private: | ||
| 147 | BOOST_HTTP_PROTO_DECL | ||
| 148 | unsigned char* | ||
| 149 | bump_down( | ||
| 150 | std::size_t size, | ||
| 151 | std::size_t align); | ||
| 152 | }; | ||
| 153 | |||
| 154 | } // detail | ||
| 155 | } // http_proto | ||
| 156 | } // boost | ||
| 157 | |||
| 158 | #include <boost/http_proto/detail/impl/workspace.hpp> | ||
| 159 | |||
| 160 | #endif | ||
| 161 |