| 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/boostorg/url | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_URL_DETAIL_OVER_ALLOCATOR_HPP | ||
| 11 | #define BOOST_URL_DETAIL_OVER_ALLOCATOR_HPP | ||
| 12 | |||
| 13 | #include <boost/config.hpp> | ||
| 14 | #include <boost/core/empty_value.hpp> | ||
| 15 | #include <boost/assert.hpp> | ||
| 16 | #include <boost/type_traits/is_final.hpp> | ||
| 17 | #include <boost/type_traits/type_with_alignment.hpp> | ||
| 18 | #ifdef BOOST_NO_CXX11_ALLOCATOR | ||
| 19 | # include <boost/core/allocator_traits.hpp> | ||
| 20 | #endif | ||
| 21 | #include <cstddef> | ||
| 22 | #include <memory> | ||
| 23 | #include <type_traits> | ||
| 24 | #include <utility> | ||
| 25 | |||
| 26 | namespace boost { | ||
| 27 | namespace urls { | ||
| 28 | namespace detail { | ||
| 29 | |||
| 30 | // This is a workaround for allocator_traits | ||
| 31 | // implementations which falsely claim C++11 | ||
| 32 | // compatibility. | ||
| 33 | #ifdef BOOST_NO_CXX11_ALLOCATOR | ||
| 34 | template<class Alloc> | ||
| 35 | using allocator_traits = | ||
| 36 | boost::allocator_traits<Alloc>; | ||
| 37 | #else | ||
| 38 | template<class Alloc> | ||
| 39 | using allocator_traits = std::allocator_traits<Alloc>; | ||
| 40 | #endif | ||
| 41 | |||
| 42 | template<class T, class Allocator> | ||
| 43 | class over_allocator | ||
| 44 | : private empty_value<Allocator> | ||
| 45 | { | ||
| 46 | template<class U, class OtherAlloc> | ||
| 47 | friend class over_allocator; | ||
| 48 | |||
| 49 | std::size_t extra_; | ||
| 50 | |||
| 51 | public: | ||
| 52 | using is_always_equal = std::false_type; | ||
| 53 | using value_type = typename | ||
| 54 | allocator_traits<typename allocator_traits< | ||
| 55 | Allocator>::template rebind_alloc<T>>::value_type; | ||
| 56 | using pointer = typename | ||
| 57 | allocator_traits<typename allocator_traits< | ||
| 58 | Allocator>::template rebind_alloc<T>>::pointer; | ||
| 59 | using const_pointer = typename | ||
| 60 | allocator_traits<typename allocator_traits< | ||
| 61 | Allocator>::template rebind_alloc<T>>::const_pointer; | ||
| 62 | using size_type = typename | ||
| 63 | allocator_traits<typename allocator_traits< | ||
| 64 | Allocator>::template rebind_alloc<T>>::size_type; | ||
| 65 | using difference_type = typename | ||
| 66 | allocator_traits<typename allocator_traits< | ||
| 67 | Allocator>::template rebind_alloc<T>>::difference_type; | ||
| 68 | |||
| 69 | template<class U> | ||
| 70 | struct rebind | ||
| 71 | { | ||
| 72 | using other = over_allocator<U, Allocator>; | ||
| 73 | }; | ||
| 74 | |||
| 75 | 2 | over_allocator( | |
| 76 | std::size_t extra, | ||
| 77 | Allocator const& alloc) | ||
| 78 | : empty_value<Allocator>( | ||
| 79 | empty_init, alloc) | ||
| 80 | 2 | , extra_(extra) | |
| 81 | { | ||
| 82 | 2 | } | |
| 83 | |||
| 84 | template<class U> | ||
| 85 | 4 | over_allocator(over_allocator<U, Allocator> const& other) noexcept | |
| 86 | : empty_value<Allocator>( | ||
| 87 | empty_init, other.get()) | ||
| 88 | 4 | , extra_(other.extra_) | |
| 89 | { | ||
| 90 | 4 | } | |
| 91 | |||
| 92 | pointer | ||
| 93 | 2 | allocate(size_type n) | |
| 94 | { | ||
| 95 |
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2 | BOOST_ASSERT(n == 1); |
| 96 | using U = typename boost::type_with_alignment< | ||
| 97 | alignof(value_type)>::type; | ||
| 98 | 2 | auto constexpr S = sizeof(U); | |
| 99 | using A = typename allocator_traits< | ||
| 100 | Allocator>::template rebind_alloc<U>; | ||
| 101 | 4 | A a(this->get()); | |
| 102 | return reinterpret_cast<pointer>( | ||
| 103 | 4 | std::allocator_traits<A>::allocate(a, | |
| 104 |
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4 | (n * sizeof(value_type) + extra_ + S - 1) / S)); |
| 105 | } | ||
| 106 | |||
| 107 | void | ||
| 108 | 2 | deallocate(pointer p, size_type n) | |
| 109 | { | ||
| 110 |
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2 | BOOST_ASSERT(n == 1); |
| 111 | using U = typename boost::type_with_alignment< | ||
| 112 | alignof(value_type)>::type; | ||
| 113 | 2 | auto constexpr S = sizeof(U); | |
| 114 | using A = typename allocator_traits< | ||
| 115 | Allocator>::template rebind_alloc<U>; | ||
| 116 | 4 | A a{this->get()}; | |
| 117 | 2 | std::allocator_traits<A>::deallocate(a, | |
| 118 | reinterpret_cast<U*>(p), | ||
| 119 |
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2 | (n * sizeof(value_type) + extra_ + S - 1) / S); |
| 120 | 2 | } | |
| 121 | |||
| 122 | #if defined(BOOST_LIBSTDCXX_VERSION) && BOOST_LIBSTDCXX_VERSION < 60000 | ||
| 123 | template<class U, class... Args> | ||
| 124 | void | ||
| 125 | construct(U* ptr, Args&&... args) | ||
| 126 | { | ||
| 127 | ::new((void*)ptr) U(std::forward<Args>(args)...); | ||
| 128 | } | ||
| 129 | |||
| 130 | template<class U> | ||
| 131 | void | ||
| 132 | destroy(U* ptr) | ||
| 133 | { | ||
| 134 | ptr->~U(); | ||
| 135 | } | ||
| 136 | #endif | ||
| 137 | |||
| 138 | template<class U> | ||
| 139 | friend | ||
| 140 | bool | ||
| 141 | operator==( | ||
| 142 | over_allocator const& lhs, | ||
| 143 | over_allocator<U, Allocator> const& rhs) | ||
| 144 | { | ||
| 145 | return | ||
| 146 | lhs.get() == rhs.get() && | ||
| 147 | lhs.extra_ == rhs.extra_; | ||
| 148 | } | ||
| 149 | |||
| 150 | template<class U> | ||
| 151 | friend | ||
| 152 | bool | ||
| 153 | operator!=( | ||
| 154 | over_allocator const& lhs, | ||
| 155 | over_allocator<U, Allocator> const& rhs) | ||
| 156 | { | ||
| 157 | return ! (lhs == rhs); | ||
| 158 | } | ||
| 159 | }; | ||
| 160 | |||
| 161 | } // detail | ||
| 162 | } // urls | ||
| 163 | } // boost | ||
| 164 | |||
| 165 | #endif | ||
| 166 |