[fa2de95] | 1 | // |
---|
| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
---|
| 3 | // |
---|
| 4 | // The contents of this file are covered under the licence agreement in the |
---|
| 5 | // file "LICENCE" distributed with Cforall. |
---|
| 6 | // |
---|
| 7 | // ScopedMap.h -- |
---|
| 8 | // |
---|
| 9 | // Author : Aaron B. Moss |
---|
| 10 | // Created On : Wed Feb 1 16:55:00 2017 |
---|
| 11 | // Last Modified By : Aaron B. Moss |
---|
| 12 | // Last Modified On : Wed Feb 1 16:55:00 2017 |
---|
| 13 | // Update Count : 1 |
---|
| 14 | // |
---|
| 15 | |
---|
| 16 | #ifndef _VECTORMAP_H |
---|
| 17 | #define _VECTORMAP_H |
---|
| 18 | |
---|
| 19 | #include <iterator> |
---|
| 20 | #include <utility> |
---|
| 21 | #include <vector> |
---|
| 22 | |
---|
| 23 | /// Maps integers from a contiguous range to T's |
---|
| 24 | template<typename T> |
---|
| 25 | class VectorMap { |
---|
| 26 | std::vector<T> data; |
---|
| 27 | |
---|
| 28 | public: |
---|
| 29 | typedef typename std::vector<T>::size_type size_type; |
---|
| 30 | typedef size_type key_type; |
---|
| 31 | typedef T mapped_type; |
---|
| 32 | typedef std::pair<size_type, T&> value_type; |
---|
| 33 | typedef std::pair<size_type, const T&> const_value_type; |
---|
| 34 | typedef typename std::vector<T>::difference_type difference_type; |
---|
| 35 | typedef const value_type& reference; |
---|
| 36 | typedef const const_value_type& const_reference; |
---|
| 37 | typedef const value_type* pointer; |
---|
| 38 | typedef const const_value_type* const_pointer; |
---|
| 39 | |
---|
[97d246d] | 40 | class iterator : public std::iterator< std::random_access_iterator_tag, |
---|
[fa2de95] | 41 | value_type, |
---|
[97d246d] | 42 | difference_type, |
---|
| 43 | pointer, |
---|
| 44 | reference > { |
---|
[fa2de95] | 45 | friend class VectorMap; |
---|
| 46 | friend class const_iterator; |
---|
| 47 | |
---|
| 48 | value_type data; |
---|
| 49 | |
---|
| 50 | iterator(size_type i, std::vector<T>& v) : data(i, v[i]) {} |
---|
| 51 | public: |
---|
| 52 | iterator(const iterator& that) : data(that.data) {} |
---|
| 53 | iterator& operator= (const iterator& that) { |
---|
| 54 | new(&data) value_type{ that.data }; |
---|
| 55 | return *this; |
---|
| 56 | } |
---|
| 57 | |
---|
| 58 | reference operator* () { return data; } |
---|
| 59 | pointer operator-> () { return &data; } |
---|
| 60 | |
---|
| 61 | iterator& operator++ () { |
---|
| 62 | // SHENANIGANS: relies on pair<unsigned, T&> having a trivial destructor and |
---|
| 63 | // vector<T> having contiguous layout |
---|
| 64 | new(&data) value_type{ (data.first + 1), *(&data.second + 1) }; |
---|
| 65 | return *this; |
---|
| 66 | } |
---|
| 67 | iterator operator++ (int) { iterator tmp = *this; ++(*this); return tmp; } |
---|
| 68 | |
---|
| 69 | iterator& operator-- () { |
---|
| 70 | // SHENANIGANS: same reasons as operator++ |
---|
| 71 | new(&data) value_type{ (data.first - 1), *(&data.second - 1) }; |
---|
| 72 | return *this; |
---|
| 73 | } |
---|
| 74 | iterator operator-- (int) { iterator tmp = *this; --(*this); return tmp; } |
---|
| 75 | |
---|
[97d246d] | 76 | iterator& operator+= (difference_type i) { |
---|
| 77 | // SHENANIGANS: same reasons as operator++ |
---|
| 78 | new(&data) value_type{ (data.first + i), *(&data.second + i) }; |
---|
| 79 | return *this; |
---|
| 80 | } |
---|
| 81 | |
---|
| 82 | iterator operator+ (difference_type i) const { iterator tmp = *this; return tmp += i; } |
---|
| 83 | |
---|
| 84 | iterator& operator-= (difference_type i) { |
---|
| 85 | // SHENANIGANS: same reasons as operator++ |
---|
| 86 | new(&data) value_type{ (data.first - i), *(&data.second - i) }; |
---|
| 87 | return *this; |
---|
| 88 | } |
---|
| 89 | |
---|
| 90 | iterator operator- (difference_type i) const { iterator tmp = *this; return tmp -= i; } |
---|
| 91 | |
---|
| 92 | difference_type operator- (const iterator& o) const { return data.first - o.data.first; } |
---|
| 93 | |
---|
| 94 | value_type operator[] (difference_type i) const { |
---|
| 95 | // SHENANIGANS: same reasons as operator++ |
---|
| 96 | return value_type{ (data.first + i), *(&data.second + i) }; |
---|
| 97 | } |
---|
| 98 | |
---|
[fa2de95] | 99 | bool operator== (const iterator& o) const { |
---|
| 100 | return data.first == o.data.first && &data.second == &o.data.second; |
---|
| 101 | } |
---|
[97d246d] | 102 | |
---|
[fa2de95] | 103 | bool operator!= (const iterator& that) const { return !(*this == that); } |
---|
[97d246d] | 104 | |
---|
| 105 | bool operator< (const iterator& o) const { return data.first < o.data.first; } |
---|
| 106 | |
---|
| 107 | bool operator> (const iterator& o) const { return data.first > o.data.first; } |
---|
| 108 | |
---|
| 109 | bool operator<= (const iterator& o) const { return data.first <= o.data.first; } |
---|
| 110 | |
---|
| 111 | bool operator>= (const iterator& o) const { return data.first >= o.data.first; } |
---|
[fa2de95] | 112 | }; |
---|
| 113 | |
---|
| 114 | class const_iterator : public std::iterator< std::bidirectional_iterator_tag, |
---|
| 115 | const_value_type, |
---|
| 116 | difference_type, |
---|
| 117 | const_pointer, |
---|
| 118 | const_reference > { |
---|
| 119 | friend class VectorMap; |
---|
| 120 | const_value_type data; |
---|
| 121 | |
---|
| 122 | const_iterator(size_type i, const std::vector<T>& v) : data(i, v[i]) {} |
---|
| 123 | public: |
---|
| 124 | const_iterator(const iterator& that) : data(that.data) {} |
---|
| 125 | const_iterator(const const_iterator& that) : data(that.data) {} |
---|
| 126 | const_iterator& operator= (const iterator& that) { |
---|
| 127 | new(&data) const_value_type{ that.data }; |
---|
| 128 | return *this; |
---|
| 129 | } |
---|
| 130 | const_iterator& operator= (const const_iterator& that) { |
---|
| 131 | new(&data) const_value_type{ that.data }; |
---|
| 132 | return *this; |
---|
| 133 | } |
---|
| 134 | |
---|
| 135 | const_reference operator* () { return data; } |
---|
| 136 | const_pointer operator-> () { return &data; } |
---|
| 137 | |
---|
| 138 | const_iterator& operator++ () { |
---|
| 139 | // SHENANIGANS: same reasons as iterator::operator++ |
---|
| 140 | new(&data) const_value_type{ (data.first + 1), *(&data.second + 1) }; |
---|
| 141 | return *this; |
---|
| 142 | } |
---|
| 143 | const_iterator operator++ (int) { const_iterator tmp = *this; ++(*this); return tmp; } |
---|
| 144 | |
---|
| 145 | const_iterator& operator-- () { |
---|
| 146 | // SHENANIGANS: same reasons as iterator::operator++ |
---|
| 147 | new(&data) const_value_type{ (data.first - 1), *(&data.second - 1) }; |
---|
| 148 | return *this; |
---|
| 149 | } |
---|
| 150 | const_iterator operator-- (int) { const_iterator tmp = *this; --(*this); return tmp; } |
---|
| 151 | |
---|
[97d246d] | 152 | const_iterator& operator+= (difference_type i) { |
---|
| 153 | // SHENANIGANS: same reasons as iterator::operator++ |
---|
| 154 | new(&data) const_value_type{ (data.first + i), *(&data.second + i) }; |
---|
| 155 | return *this; |
---|
| 156 | } |
---|
| 157 | |
---|
| 158 | const_iterator operator+ (difference_type i) const { |
---|
| 159 | const_iterator tmp = *this; return tmp += i; |
---|
| 160 | } |
---|
| 161 | |
---|
| 162 | const_iterator& operator-= (difference_type i) { |
---|
| 163 | // SHENANIGANS: same reasons as iterator::operator++ |
---|
| 164 | new(&data) const_value_type{ (data.first - i), *(&data.second - i) }; |
---|
| 165 | return *this; |
---|
| 166 | } |
---|
| 167 | |
---|
| 168 | const_iterator operator- (difference_type i) const { |
---|
| 169 | const_iterator tmp = *this; return tmp -= i; |
---|
| 170 | } |
---|
| 171 | |
---|
| 172 | difference_type operator- (const const_iterator& o) const { |
---|
| 173 | return data.first - o.data.first; |
---|
| 174 | } |
---|
| 175 | |
---|
| 176 | const_value_type operator[] (difference_type i) const { |
---|
| 177 | // SHENANIGANS: same reasons as iterator::operator++ |
---|
| 178 | return const_value_type{ (data.first + i), *(&data.second + i) }; |
---|
| 179 | } |
---|
| 180 | |
---|
[fa2de95] | 181 | bool operator== (const const_iterator& o) const { |
---|
| 182 | return data.first == o.data.first && &data.second == &o.data.second; |
---|
| 183 | } |
---|
[97d246d] | 184 | |
---|
[fa2de95] | 185 | bool operator!= (const const_iterator& that) const { return !(*this == that); } |
---|
[97d246d] | 186 | |
---|
| 187 | bool operator< (const const_iterator& o) const { return data.first < o.data.first; } |
---|
| 188 | |
---|
| 189 | bool operator> (const const_iterator& o) const { return data.first > o.data.first; } |
---|
| 190 | |
---|
| 191 | bool operator<= (const const_iterator& o) const { return data.first <= o.data.first; } |
---|
| 192 | |
---|
| 193 | bool operator>= (const const_iterator& o) const { return data.first >= o.data.first; } |
---|
[fa2de95] | 194 | }; |
---|
| 195 | |
---|
| 196 | /// Reserve space for n elements |
---|
| 197 | void reserve(size_type n) { |
---|
| 198 | if ( n > data.size() ) { data.insert( data.end(), n - data.size(), T{} ); } |
---|
| 199 | } |
---|
| 200 | |
---|
| 201 | /// Unsafe access; no bounds checking |
---|
| 202 | T& operator[] (size_type i) { return data[i]; } |
---|
| 203 | const T& operator[] (size_type i) const { return data[i]; } |
---|
| 204 | |
---|
| 205 | /// Safe access; will insert new values if needed |
---|
| 206 | T& at(size_type i) { |
---|
| 207 | reserve(i+1); |
---|
| 208 | return data[i]; |
---|
| 209 | } |
---|
| 210 | |
---|
| 211 | /// Number of stored values |
---|
| 212 | unsigned size() const { return data.size(); } |
---|
| 213 | |
---|
| 214 | /// No stored values |
---|
| 215 | bool empty() const { return data.empty(); } |
---|
| 216 | |
---|
| 217 | /// Empties the map |
---|
| 218 | void clear() { data.clear(); } |
---|
| 219 | |
---|
| 220 | /// Returns 1 if element in map, 0 otherwise |
---|
| 221 | size_type count( size_type i ) const { return i < size() ? 1 : 0; } |
---|
| 222 | |
---|
| 223 | iterator begin() { return iterator{ 0, data }; } |
---|
| 224 | const_iterator begin() const { return const_iterator{ 0, data }; } |
---|
| 225 | const_iterator cbegin() const { return const_iterator{ 0, data }; } |
---|
| 226 | |
---|
| 227 | iterator end() { return iterator{ data.size(), data }; } |
---|
| 228 | const_iterator end() const { return const_iterator{ data.size(), data }; } |
---|
| 229 | const_iterator cend() const { return const_iterator{ data.size(), data }; } |
---|
| 230 | |
---|
| 231 | iterator find( size_type i ) { return i < size() ? iterator{ i, data } : end(); } |
---|
| 232 | const_iterator find( size_type i ) const { return i < size() ? const_iterator{ i, data } : end(); } |
---|
| 233 | }; |
---|
| 234 | |
---|
[97d246d] | 235 | template<typename T> |
---|
| 236 | typename VectorMap<T>::iterator operator+ (typename VectorMap<T>::difference_type i, |
---|
| 237 | const typename VectorMap<T>::iterator& it) { |
---|
| 238 | return it + i; |
---|
| 239 | } |
---|
| 240 | |
---|
| 241 | template<typename T> |
---|
| 242 | typename VectorMap<T>::const_iterator operator+ (typename VectorMap<T>::difference_type i, |
---|
| 243 | const typename VectorMap<T>::const_iterator& it) { |
---|
| 244 | return it + i; |
---|
| 245 | } |
---|
| 246 | |
---|
[fa2de95] | 247 | #endif // _VECTORMAP_H |
---|
| 248 | |
---|
| 249 | // Local Variables: // |
---|
| 250 | // tab-width: 4 // |
---|
| 251 | // mode: c++ // |
---|
| 252 | // compile-command: "make install" // |
---|
| 253 | // End: // |
---|