1 #ifndef MIN_ALLOCATOR_H
2 #define MIN_ALLOCATOR_H
4 #if __cplusplus >= 201103L
8 template <class T> class min_pointer;
9 template <class T> class min_pointer<const T>;
10 template <> class min_pointer<void>;
11 template <> class min_pointer<const void>;
12 template <class T> class min_allocator;
15 class min_pointer<const void>
19 min_pointer() noexcept = default;
20 min_pointer(std::nullptr_t) : ptr_(nullptr) {}
22 min_pointer(min_pointer<T> p) : ptr_(p.ptr_) {}
24 explicit operator bool() const {return ptr_ != nullptr;}
26 friend bool operator==(min_pointer x, min_pointer y) {return x.ptr_ == y.ptr_;}
27 friend bool operator!=(min_pointer x, min_pointer y) {return !(x == y);}
28 template <class U> friend class min_pointer;
32 class min_pointer<void>
36 min_pointer() noexcept = default;
37 min_pointer(std::nullptr_t) : ptr_(nullptr) {}
39 class = typename std::enable_if
41 !std::is_const<T>::value
44 min_pointer(min_pointer<T> p) : ptr_(p.ptr_) {}
46 explicit operator bool() const {return ptr_ != nullptr;}
48 friend bool operator==(min_pointer x, min_pointer y) {return x.ptr_ == y.ptr_;}
49 friend bool operator!=(min_pointer x, min_pointer y) {return !(x == y);}
50 template <class U> friend class min_pointer;
58 explicit min_pointer(T* p) : ptr_(p) {}
60 min_pointer() noexcept = default;
61 min_pointer(std::nullptr_t) : ptr_(nullptr) {}
62 explicit min_pointer(min_pointer<void> p) : ptr_(static_cast<T*>(p.ptr_)) {}
64 explicit operator bool() const {return ptr_ != nullptr;}
66 typedef std::ptrdiff_t difference_type;
70 typedef std::random_access_iterator_tag iterator_category;
72 reference operator*() const {return *ptr_;}
73 pointer operator->() const {return ptr_;}
75 min_pointer& operator++() {++ptr_; return *this;}
76 min_pointer operator++(int) {min_pointer tmp(*this); ++ptr_; return tmp;}
78 min_pointer& operator--() {--ptr_; return *this;}
79 min_pointer operator--(int) {min_pointer tmp(*this); --ptr_; return tmp;}
81 min_pointer& operator+=(difference_type n) {ptr_ += n; return *this;}
82 min_pointer& operator-=(difference_type n) {ptr_ -= n; return *this;}
84 min_pointer operator+(difference_type n) const
86 min_pointer tmp(*this);
91 friend min_pointer operator+(difference_type n, min_pointer x)
96 min_pointer operator-(difference_type n) const
98 min_pointer tmp(*this);
103 friend difference_type operator-(min_pointer x, min_pointer y)
105 return x.ptr_ - y.ptr_;
108 reference operator[](difference_type n) const {return ptr_[n];}
110 friend bool operator< (min_pointer x, min_pointer y) {return x.ptr_ < y.ptr_;}
111 friend bool operator> (min_pointer x, min_pointer y) {return y < x;}
112 friend bool operator<=(min_pointer x, min_pointer y) {return !(y < x);}
113 friend bool operator>=(min_pointer x, min_pointer y) {return !(x < y);}
115 static min_pointer pointer_to(T& t) {return min_pointer(std::addressof(t));}
117 friend bool operator==(min_pointer x, min_pointer y) {return x.ptr_ == y.ptr_;}
118 friend bool operator!=(min_pointer x, min_pointer y) {return !(x == y);}
119 template <class U> friend class min_pointer;
120 template <class U> friend class min_allocator;
124 class min_pointer<const T>
128 explicit min_pointer(const T* p) : ptr_(p) {}
130 min_pointer() noexcept = default;
131 min_pointer(std::nullptr_t) : ptr_(nullptr) {}
132 min_pointer(min_pointer<T> p) : ptr_(p.ptr_) {}
133 explicit min_pointer(min_pointer<const void> p) : ptr_(static_cast<const T*>(p.ptr_)) {}
135 explicit operator bool() const {return ptr_ != nullptr;}
137 typedef std::ptrdiff_t difference_type;
138 typedef const T& reference;
139 typedef const T* pointer;
140 typedef const T value_type;
141 typedef std::random_access_iterator_tag iterator_category;
143 reference operator*() const {return *ptr_;}
144 pointer operator->() const {return ptr_;}
146 min_pointer& operator++() {++ptr_; return *this;}
147 min_pointer operator++(int) {min_pointer tmp(*this); ++ptr_; return tmp;}
149 min_pointer& operator--() {--ptr_; return *this;}
150 min_pointer operator--(int) {min_pointer tmp(*this); --ptr_; return tmp;}
152 min_pointer& operator+=(difference_type n) {ptr_ += n; return *this;}
153 min_pointer& operator-=(difference_type n) {ptr_ -= n; return *this;}
155 min_pointer operator+(difference_type n) const
157 min_pointer tmp(*this);
162 friend min_pointer operator+(difference_type n, min_pointer x)
167 min_pointer operator-(difference_type n) const
169 min_pointer tmp(*this);
174 friend difference_type operator-(min_pointer x, min_pointer y)
176 return x.ptr_ - y.ptr_;
179 reference operator[](difference_type n) const {return ptr_[n];}
181 friend bool operator< (min_pointer x, min_pointer y) {return x.ptr_ < y.ptr_;}
182 friend bool operator> (min_pointer x, min_pointer y) {return y < x;}
183 friend bool operator<=(min_pointer x, min_pointer y) {return !(y < x);}
184 friend bool operator>=(min_pointer x, min_pointer y) {return !(x < y);}
186 static min_pointer pointer_to(const T& t) {return min_pointer(std::addressof(t));}
188 friend bool operator==(min_pointer x, min_pointer y) {return x.ptr_ == y.ptr_;}
189 friend bool operator!=(min_pointer x, min_pointer y) {return !(x == y);}
190 template <class U> friend class min_pointer;
196 operator==(min_pointer<T> x, std::nullptr_t)
198 return !static_cast<bool>(x);
204 operator==(std::nullptr_t, min_pointer<T> x)
206 return !static_cast<bool>(x);
212 operator!=(min_pointer<T> x, std::nullptr_t)
214 return static_cast<bool>(x);
220 operator!=(std::nullptr_t, min_pointer<T> x)
222 return static_cast<bool>(x);
229 typedef T value_type;
230 typedef min_pointer<T> pointer;
232 min_allocator() = default;
234 min_allocator(min_allocator<U>) {}
236 pointer allocate(std::ptrdiff_t n)
238 return pointer(static_cast<T*>(::operator new(n*sizeof(T))));
241 void deallocate(pointer p, std::ptrdiff_t)
243 return ::operator delete(p.ptr_);
246 friend bool operator==(min_allocator, min_allocator) {return true;}
247 friend bool operator!=(min_allocator x, min_allocator y) {return !(x == y);}
250 #endif // __cplusplus >= 201103L
252 #endif // MIN_ALLOCATOR_H