source: src/Common/VectorMap.h@ a8b87d3

ADT ast-experimental pthread-emulation qualifiedEnum
Last change on this file since a8b87d3 was 6b0b624, checked in by Peter A. Buhr <pabuhr@…>, 8 years ago

change #ifndef to #pragma once
  • Property mode set to 100644
File size: 8.1 KB
RevLine 
[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//
[fea3faa]7// VectorMap.h --
[fa2de95]8//
9// Author : Aaron B. Moss
10// Created On : Wed Feb 1 16:55:00 2017
[6b0b624]11// Last Modified By : Peter A. Buhr
12// Last Modified On : Fri Jul 21 22:19:29 2017
13// Update Count : 2
[fa2de95]14//
15
[6b0b624]16#pragma once
[fa2de95]17
18#include <iterator>
19#include <utility>
20#include <vector>
21
22/// Maps integers from a contiguous range to T's
23template<typename T>
24class VectorMap {
25 std::vector<T> data;
26
27public:
28 typedef typename std::vector<T>::size_type size_type;
29 typedef size_type key_type;
30 typedef T mapped_type;
31 typedef std::pair<size_type, T&> value_type;
32 typedef std::pair<size_type, const T&> const_value_type;
33 typedef typename std::vector<T>::difference_type difference_type;
34 typedef const value_type& reference;
35 typedef const const_value_type& const_reference;
36 typedef const value_type* pointer;
37 typedef const const_value_type* const_pointer;
38
[97d246d]39 class iterator : public std::iterator< std::random_access_iterator_tag,
[fa2de95]40 value_type,
[97d246d]41 difference_type,
42 pointer,
43 reference > {
[fa2de95]44 friend class VectorMap;
45 friend class const_iterator;
46
47 value_type data;
48
49 iterator(size_type i, std::vector<T>& v) : data(i, v[i]) {}
50 public:
51 iterator(const iterator& that) : data(that.data) {}
52 iterator& operator= (const iterator& that) {
53 new(&data) value_type{ that.data };
54 return *this;
55 }
56
57 reference operator* () { return data; }
58 pointer operator-> () { return &data; }
59
60 iterator& operator++ () {
61 // SHENANIGANS: relies on pair<unsigned, T&> having a trivial destructor and
62 // vector<T> having contiguous layout
63 new(&data) value_type{ (data.first + 1), *(&data.second + 1) };
64 return *this;
65 }
66 iterator operator++ (int) { iterator tmp = *this; ++(*this); return tmp; }
67
68 iterator& operator-- () {
69 // SHENANIGANS: same reasons as operator++
70 new(&data) value_type{ (data.first - 1), *(&data.second - 1) };
71 return *this;
72 }
73 iterator operator-- (int) { iterator tmp = *this; --(*this); return tmp; }
74
[97d246d]75 iterator& operator+= (difference_type i) {
76 // SHENANIGANS: same reasons as operator++
77 new(&data) value_type{ (data.first + i), *(&data.second + i) };
78 return *this;
79 }
80
81 iterator operator+ (difference_type i) const { iterator tmp = *this; return tmp += i; }
82
83 iterator& operator-= (difference_type i) {
84 // SHENANIGANS: same reasons as operator++
85 new(&data) value_type{ (data.first - i), *(&data.second - i) };
86 return *this;
87 }
88
89 iterator operator- (difference_type i) const { iterator tmp = *this; return tmp -= i; }
90
91 difference_type operator- (const iterator& o) const { return data.first - o.data.first; }
92
93 value_type operator[] (difference_type i) const {
94 // SHENANIGANS: same reasons as operator++
95 return value_type{ (data.first + i), *(&data.second + i) };
96 }
97
[fa2de95]98 bool operator== (const iterator& o) const {
99 return data.first == o.data.first && &data.second == &o.data.second;
100 }
[97d246d]101
[fa2de95]102 bool operator!= (const iterator& that) const { return !(*this == that); }
[97d246d]103
104 bool operator< (const iterator& o) const { return data.first < o.data.first; }
105
106 bool operator> (const iterator& o) const { return data.first > o.data.first; }
107
108 bool operator<= (const iterator& o) const { return data.first <= o.data.first; }
109
110 bool operator>= (const iterator& o) const { return data.first >= o.data.first; }
[fa2de95]111 };
112
113 class const_iterator : public std::iterator< std::bidirectional_iterator_tag,
114 const_value_type,
115 difference_type,
116 const_pointer,
117 const_reference > {
118 friend class VectorMap;
119 const_value_type data;
120
121 const_iterator(size_type i, const std::vector<T>& v) : data(i, v[i]) {}
122 public:
123 const_iterator(const iterator& that) : data(that.data) {}
124 const_iterator(const const_iterator& that) : data(that.data) {}
125 const_iterator& operator= (const iterator& that) {
126 new(&data) const_value_type{ that.data };
127 return *this;
128 }
129 const_iterator& operator= (const const_iterator& that) {
130 new(&data) const_value_type{ that.data };
131 return *this;
132 }
133
134 const_reference operator* () { return data; }
135 const_pointer operator-> () { return &data; }
136
137 const_iterator& operator++ () {
138 // SHENANIGANS: same reasons as iterator::operator++
139 new(&data) const_value_type{ (data.first + 1), *(&data.second + 1) };
140 return *this;
141 }
142 const_iterator operator++ (int) { const_iterator tmp = *this; ++(*this); return tmp; }
143
144 const_iterator& operator-- () {
145 // SHENANIGANS: same reasons as iterator::operator++
146 new(&data) const_value_type{ (data.first - 1), *(&data.second - 1) };
147 return *this;
148 }
149 const_iterator operator-- (int) { const_iterator tmp = *this; --(*this); return tmp; }
150
[97d246d]151 const_iterator& operator+= (difference_type i) {
152 // SHENANIGANS: same reasons as iterator::operator++
153 new(&data) const_value_type{ (data.first + i), *(&data.second + i) };
154 return *this;
155 }
156
157 const_iterator operator+ (difference_type i) const {
158 const_iterator tmp = *this; return tmp += i;
159 }
160
161 const_iterator& operator-= (difference_type i) {
162 // SHENANIGANS: same reasons as iterator::operator++
163 new(&data) const_value_type{ (data.first - i), *(&data.second - i) };
164 return *this;
165 }
166
167 const_iterator operator- (difference_type i) const {
168 const_iterator tmp = *this; return tmp -= i;
169 }
170
171 difference_type operator- (const const_iterator& o) const {
172 return data.first - o.data.first;
173 }
174
175 const_value_type operator[] (difference_type i) const {
176 // SHENANIGANS: same reasons as iterator::operator++
177 return const_value_type{ (data.first + i), *(&data.second + i) };
178 }
179
[fa2de95]180 bool operator== (const const_iterator& o) const {
181 return data.first == o.data.first && &data.second == &o.data.second;
182 }
[97d246d]183
[fa2de95]184 bool operator!= (const const_iterator& that) const { return !(*this == that); }
[97d246d]185
186 bool operator< (const const_iterator& o) const { return data.first < o.data.first; }
187
188 bool operator> (const const_iterator& o) const { return data.first > o.data.first; }
189
190 bool operator<= (const const_iterator& o) const { return data.first <= o.data.first; }
191
192 bool operator>= (const const_iterator& o) const { return data.first >= o.data.first; }
[fa2de95]193 };
194
195 /// Reserve space for n elements
196 void reserve(size_type n) {
197 if ( n > data.size() ) { data.insert( data.end(), n - data.size(), T{} ); }
198 }
199
200 /// Unsafe access; no bounds checking
201 T& operator[] (size_type i) { return data[i]; }
202 const T& operator[] (size_type i) const { return data[i]; }
203
204 /// Safe access; will insert new values if needed
205 T& at(size_type i) {
206 reserve(i+1);
207 return data[i];
208 }
209
210 /// Number of stored values
211 unsigned size() const { return data.size(); }
212
213 /// No stored values
214 bool empty() const { return data.empty(); }
215
216 /// Empties the map
217 void clear() { data.clear(); }
218
219 /// Returns 1 if element in map, 0 otherwise
220 size_type count( size_type i ) const { return i < size() ? 1 : 0; }
221
222 iterator begin() { return iterator{ 0, data }; }
223 const_iterator begin() const { return const_iterator{ 0, data }; }
224 const_iterator cbegin() const { return const_iterator{ 0, data }; }
225
226 iterator end() { return iterator{ data.size(), data }; }
227 const_iterator end() const { return const_iterator{ data.size(), data }; }
228 const_iterator cend() const { return const_iterator{ data.size(), data }; }
229
230 iterator find( size_type i ) { return i < size() ? iterator{ i, data } : end(); }
231 const_iterator find( size_type i ) const { return i < size() ? const_iterator{ i, data } : end(); }
232};
233
[97d246d]234template<typename T>
235typename VectorMap<T>::iterator operator+ (typename VectorMap<T>::difference_type i,
236 const typename VectorMap<T>::iterator& it) {
237 return it + i;
238}
239
240template<typename T>
241typename VectorMap<T>::const_iterator operator+ (typename VectorMap<T>::difference_type i,
242 const typename VectorMap<T>::const_iterator& it) {
243 return it + i;
244}
245
[fa2de95]246// Local Variables: //
247// tab-width: 4 //
248// mode: c++ //
249// compile-command: "make install" //
250// End: //
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