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1 | /* |
2 | Copyright 2019 Glen Joseph Fernandes | |
3 | (glenjofe@gmail.com) | |
4 | ||
5 | Distributed under the Boost Software License, Version 1.0. | |
6 | (http://www.boost.org/LICENSE_1_0.txt) | |
7 | */ | |
8 | #ifndef BOOST_CORE_DEFAULT_ALLOCATOR_HPP | |
9 | #define BOOST_CORE_DEFAULT_ALLOCATOR_HPP | |
10 | ||
11 | #include <boost/config.hpp> | |
12 | #include <new> | |
92f5a8d4 TL |
13 | |
14 | namespace boost { | |
15 | ||
16 | #if defined(BOOST_NO_EXCEPTIONS) | |
17 | BOOST_NORETURN void throw_exception(const std::exception&); | |
18 | #endif | |
19 | ||
20 | namespace default_ { | |
21 | ||
22 | struct true_type { | |
23 | typedef bool value_type; | |
24 | typedef true_type type; | |
25 | ||
26 | BOOST_STATIC_CONSTANT(bool, value = true); | |
27 | ||
28 | BOOST_CONSTEXPR operator bool() const BOOST_NOEXCEPT { | |
29 | return true; | |
30 | } | |
31 | ||
32 | BOOST_CONSTEXPR bool operator()() const BOOST_NOEXCEPT { | |
33 | return true; | |
34 | } | |
35 | }; | |
36 | ||
37 | template<class T> | |
38 | struct add_reference { | |
39 | typedef T& type; | |
40 | }; | |
41 | ||
42 | template<> | |
43 | struct add_reference<void> { | |
44 | typedef void type; | |
45 | }; | |
46 | ||
47 | template<> | |
48 | struct add_reference<const void> { | |
49 | typedef const void type; | |
50 | }; | |
51 | ||
52 | template<class T> | |
53 | struct default_allocator { | |
54 | typedef T value_type; | |
55 | typedef T* pointer; | |
56 | typedef const T* const_pointer; | |
57 | typedef typename add_reference<T>::type reference; | |
58 | typedef typename add_reference<const T>::type const_reference; | |
59 | typedef std::size_t size_type; | |
60 | typedef std::ptrdiff_t difference_type; | |
61 | typedef true_type propagate_on_container_move_assignment; | |
62 | typedef true_type is_always_equal; | |
63 | ||
64 | template<class U> | |
65 | struct rebind { | |
66 | typedef default_allocator<U> other; | |
67 | }; | |
68 | ||
69 | #if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) | |
70 | default_allocator() = default; | |
71 | #else | |
72 | BOOST_CONSTEXPR default_allocator() BOOST_NOEXCEPT { } | |
73 | #endif | |
74 | ||
75 | template<class U> | |
76 | BOOST_CONSTEXPR default_allocator(const default_allocator<U>&) | |
77 | BOOST_NOEXCEPT { } | |
78 | ||
92f5a8d4 | 79 | BOOST_CONSTEXPR std::size_t max_size() const BOOST_NOEXCEPT { |
20effc67 | 80 | return static_cast<std::size_t>(-1) / (2 < sizeof(T) ? sizeof(T) : 2); |
92f5a8d4 | 81 | } |
92f5a8d4 TL |
82 | |
83 | #if !defined(BOOST_NO_EXCEPTIONS) | |
84 | T* allocate(std::size_t n) { | |
85 | if (n > max_size()) { | |
86 | throw std::bad_alloc(); | |
87 | } | |
88 | return static_cast<T*>(::operator new(sizeof(T) * n)); | |
89 | } | |
90 | ||
91 | void deallocate(T* p, std::size_t) { | |
92 | ::operator delete(p); | |
93 | } | |
94 | #else | |
95 | T* allocate(std::size_t n) { | |
96 | if (n > max_size()) { | |
97 | boost::throw_exception(std::bad_alloc()); | |
98 | } | |
99 | void* p = ::operator new(sizeof(T) * n, std::nothrow); | |
100 | if (!p) { | |
101 | boost::throw_exception(std::bad_alloc()); | |
102 | } | |
103 | return static_cast<T*>(p); | |
104 | } | |
105 | ||
106 | void deallocate(T* p, std::size_t) { | |
107 | ::operator delete(p, std::nothrow); | |
108 | } | |
109 | #endif | |
110 | ||
20effc67 TL |
111 | #if (defined(BOOST_LIBSTDCXX_VERSION) && BOOST_LIBSTDCXX_VERSION < 60000) || \ |
112 | defined(BOOST_NO_CXX11_ALLOCATOR) | |
92f5a8d4 TL |
113 | template<class U, class V> |
114 | void construct(U* p, const V& v) { | |
115 | ::new(p) U(v); | |
116 | } | |
117 | ||
118 | template<class U> | |
119 | void destroy(U* p) { | |
120 | p->~U(); | |
20effc67 | 121 | (void)p; |
92f5a8d4 TL |
122 | } |
123 | #endif | |
124 | }; | |
125 | ||
126 | template<class T, class U> | |
127 | BOOST_CONSTEXPR inline bool | |
128 | operator==(const default_allocator<T>&, | |
129 | const default_allocator<U>&) BOOST_NOEXCEPT | |
130 | { | |
131 | return true; | |
132 | } | |
133 | ||
134 | template<class T, class U> | |
135 | BOOST_CONSTEXPR inline bool | |
136 | operator!=(const default_allocator<T>&, | |
137 | const default_allocator<U>&) BOOST_NOEXCEPT | |
138 | { | |
139 | return false; | |
140 | } | |
141 | ||
142 | } /* default_ */ | |
143 | ||
144 | using default_::default_allocator; | |
145 | ||
146 | } /* boost */ | |
147 | ||
148 | #endif |