[fa2de95] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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[fea3faa] | 7 | // VectorMap.h -- |
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[fa2de95] | 8 | // |
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| 9 | // Author : Aaron B. Moss |
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| 10 | // Created On : Wed Feb 1 16:55:00 2017 |
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[6b0b624] | 11 | // Last Modified By : Peter A. Buhr |
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| 12 | // Last Modified On : Fri Jul 21 22:19:29 2017 |
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| 13 | // Update Count : 2 |
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[fa2de95] | 14 | // |
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| 15 | |
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[6b0b624] | 16 | #pragma once |
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[fa2de95] | 17 | |
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| 18 | #include <iterator> |
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| 19 | #include <utility> |
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| 20 | #include <vector> |
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| 21 | |
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| 22 | /// Maps integers from a contiguous range to T's |
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| 23 | template<typename T> |
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| 24 | class VectorMap { |
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| 25 | std::vector<T> data; |
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| 26 | |
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| 27 | public: |
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| 28 | typedef typename std::vector<T>::size_type size_type; |
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| 29 | typedef size_type key_type; |
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| 30 | typedef T mapped_type; |
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| 31 | typedef std::pair<size_type, T&> value_type; |
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| 32 | typedef std::pair<size_type, const T&> const_value_type; |
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| 33 | typedef typename std::vector<T>::difference_type difference_type; |
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| 34 | typedef const value_type& reference; |
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| 35 | typedef const const_value_type& const_reference; |
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| 36 | typedef const value_type* pointer; |
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| 37 | typedef const const_value_type* const_pointer; |
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| 38 | |
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[97d246d] | 39 | class iterator : public std::iterator< std::random_access_iterator_tag, |
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[fa2de95] | 40 | value_type, |
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[97d246d] | 41 | difference_type, |
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| 42 | pointer, |
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| 43 | reference > { |
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[fa2de95] | 44 | friend class VectorMap; |
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| 45 | friend class const_iterator; |
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| 46 | |
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| 47 | value_type data; |
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| 48 | |
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| 49 | iterator(size_type i, std::vector<T>& v) : data(i, v[i]) {} |
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| 50 | public: |
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| 51 | iterator(const iterator& that) : data(that.data) {} |
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| 52 | iterator& operator= (const iterator& that) { |
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| 53 | new(&data) value_type{ that.data }; |
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| 54 | return *this; |
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| 55 | } |
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| 56 | |
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| 57 | reference operator* () { return data; } |
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| 58 | pointer operator-> () { return &data; } |
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| 59 | |
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| 60 | iterator& operator++ () { |
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| 61 | // SHENANIGANS: relies on pair<unsigned, T&> having a trivial destructor and |
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| 62 | // vector<T> having contiguous layout |
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| 63 | new(&data) value_type{ (data.first + 1), *(&data.second + 1) }; |
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| 64 | return *this; |
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| 65 | } |
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| 66 | iterator operator++ (int) { iterator tmp = *this; ++(*this); return tmp; } |
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| 67 | |
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| 68 | iterator& operator-- () { |
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| 69 | // SHENANIGANS: same reasons as operator++ |
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| 70 | new(&data) value_type{ (data.first - 1), *(&data.second - 1) }; |
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| 71 | return *this; |
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| 72 | } |
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| 73 | iterator operator-- (int) { iterator tmp = *this; --(*this); return tmp; } |
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| 74 | |
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[97d246d] | 75 | iterator& operator+= (difference_type i) { |
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| 76 | // SHENANIGANS: same reasons as operator++ |
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| 77 | new(&data) value_type{ (data.first + i), *(&data.second + i) }; |
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| 78 | return *this; |
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| 79 | } |
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| 80 | |
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| 81 | iterator operator+ (difference_type i) const { iterator tmp = *this; return tmp += i; } |
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| 82 | |
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| 83 | iterator& operator-= (difference_type i) { |
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| 84 | // SHENANIGANS: same reasons as operator++ |
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| 85 | new(&data) value_type{ (data.first - i), *(&data.second - i) }; |
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| 86 | return *this; |
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| 87 | } |
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| 88 | |
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| 89 | iterator operator- (difference_type i) const { iterator tmp = *this; return tmp -= i; } |
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| 90 | |
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| 91 | difference_type operator- (const iterator& o) const { return data.first - o.data.first; } |
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| 92 | |
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| 93 | value_type operator[] (difference_type i) const { |
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| 94 | // SHENANIGANS: same reasons as operator++ |
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| 95 | return value_type{ (data.first + i), *(&data.second + i) }; |
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| 96 | } |
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| 97 | |
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[fa2de95] | 98 | bool operator== (const iterator& o) const { |
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| 99 | return data.first == o.data.first && &data.second == &o.data.second; |
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| 100 | } |
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[97d246d] | 101 | |
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[fa2de95] | 102 | bool operator!= (const iterator& that) const { return !(*this == that); } |
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[97d246d] | 103 | |
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| 104 | bool operator< (const iterator& o) const { return data.first < o.data.first; } |
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| 105 | |
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| 106 | bool operator> (const iterator& o) const { return data.first > o.data.first; } |
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| 107 | |
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| 108 | bool operator<= (const iterator& o) const { return data.first <= o.data.first; } |
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| 109 | |
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| 110 | bool operator>= (const iterator& o) const { return data.first >= o.data.first; } |
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[fa2de95] | 111 | }; |
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| 112 | |
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| 113 | class const_iterator : public std::iterator< std::bidirectional_iterator_tag, |
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| 114 | const_value_type, |
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| 115 | difference_type, |
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| 116 | const_pointer, |
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| 117 | const_reference > { |
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| 118 | friend class VectorMap; |
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| 119 | const_value_type data; |
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| 120 | |
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| 121 | const_iterator(size_type i, const std::vector<T>& v) : data(i, v[i]) {} |
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| 122 | public: |
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| 123 | const_iterator(const iterator& that) : data(that.data) {} |
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| 124 | const_iterator(const const_iterator& that) : data(that.data) {} |
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| 125 | const_iterator& operator= (const iterator& that) { |
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| 126 | new(&data) const_value_type{ that.data }; |
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| 127 | return *this; |
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| 128 | } |
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| 129 | const_iterator& operator= (const const_iterator& that) { |
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| 130 | new(&data) const_value_type{ that.data }; |
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| 131 | return *this; |
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| 132 | } |
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| 133 | |
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| 134 | const_reference operator* () { return data; } |
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| 135 | const_pointer operator-> () { return &data; } |
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| 136 | |
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| 137 | const_iterator& operator++ () { |
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| 138 | // SHENANIGANS: same reasons as iterator::operator++ |
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| 139 | new(&data) const_value_type{ (data.first + 1), *(&data.second + 1) }; |
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| 140 | return *this; |
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| 141 | } |
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| 142 | const_iterator operator++ (int) { const_iterator tmp = *this; ++(*this); return tmp; } |
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| 143 | |
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| 144 | const_iterator& operator-- () { |
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| 145 | // SHENANIGANS: same reasons as iterator::operator++ |
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| 146 | new(&data) const_value_type{ (data.first - 1), *(&data.second - 1) }; |
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| 147 | return *this; |
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| 148 | } |
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| 149 | const_iterator operator-- (int) { const_iterator tmp = *this; --(*this); return tmp; } |
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| 150 | |
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[97d246d] | 151 | const_iterator& operator+= (difference_type i) { |
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| 152 | // SHENANIGANS: same reasons as iterator::operator++ |
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| 153 | new(&data) const_value_type{ (data.first + i), *(&data.second + i) }; |
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| 154 | return *this; |
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| 155 | } |
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| 156 | |
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| 157 | const_iterator operator+ (difference_type i) const { |
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| 158 | const_iterator tmp = *this; return tmp += i; |
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| 159 | } |
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| 160 | |
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| 161 | const_iterator& operator-= (difference_type i) { |
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| 162 | // SHENANIGANS: same reasons as iterator::operator++ |
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| 163 | new(&data) const_value_type{ (data.first - i), *(&data.second - i) }; |
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| 164 | return *this; |
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| 165 | } |
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| 166 | |
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| 167 | const_iterator operator- (difference_type i) const { |
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| 168 | const_iterator tmp = *this; return tmp -= i; |
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| 169 | } |
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| 170 | |
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| 171 | difference_type operator- (const const_iterator& o) const { |
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| 172 | return data.first - o.data.first; |
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| 173 | } |
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| 174 | |
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| 175 | const_value_type operator[] (difference_type i) const { |
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| 176 | // SHENANIGANS: same reasons as iterator::operator++ |
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| 177 | return const_value_type{ (data.first + i), *(&data.second + i) }; |
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| 178 | } |
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| 179 | |
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[fa2de95] | 180 | bool operator== (const const_iterator& o) const { |
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| 181 | return data.first == o.data.first && &data.second == &o.data.second; |
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| 182 | } |
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[97d246d] | 183 | |
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[fa2de95] | 184 | bool operator!= (const const_iterator& that) const { return !(*this == that); } |
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[97d246d] | 185 | |
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| 186 | bool operator< (const const_iterator& o) const { return data.first < o.data.first; } |
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| 187 | |
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| 188 | bool operator> (const const_iterator& o) const { return data.first > o.data.first; } |
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| 189 | |
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| 190 | bool operator<= (const const_iterator& o) const { return data.first <= o.data.first; } |
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| 191 | |
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| 192 | bool operator>= (const const_iterator& o) const { return data.first >= o.data.first; } |
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[fa2de95] | 193 | }; |
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| 194 | |
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| 195 | /// Reserve space for n elements |
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| 196 | void reserve(size_type n) { |
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| 197 | if ( n > data.size() ) { data.insert( data.end(), n - data.size(), T{} ); } |
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| 198 | } |
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| 199 | |
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| 200 | /// Unsafe access; no bounds checking |
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| 201 | T& operator[] (size_type i) { return data[i]; } |
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| 202 | const T& operator[] (size_type i) const { return data[i]; } |
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| 203 | |
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| 204 | /// Safe access; will insert new values if needed |
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| 205 | T& at(size_type i) { |
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| 206 | reserve(i+1); |
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| 207 | return data[i]; |
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| 208 | } |
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| 209 | |
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| 210 | /// Number of stored values |
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| 211 | unsigned size() const { return data.size(); } |
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| 212 | |
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| 213 | /// No stored values |
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| 214 | bool empty() const { return data.empty(); } |
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| 215 | |
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| 216 | /// Empties the map |
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| 217 | void clear() { data.clear(); } |
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| 218 | |
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| 219 | /// Returns 1 if element in map, 0 otherwise |
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| 220 | size_type count( size_type i ) const { return i < size() ? 1 : 0; } |
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| 221 | |
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| 222 | iterator begin() { return iterator{ 0, data }; } |
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| 223 | const_iterator begin() const { return const_iterator{ 0, data }; } |
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| 224 | const_iterator cbegin() const { return const_iterator{ 0, data }; } |
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| 225 | |
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| 226 | iterator end() { return iterator{ data.size(), data }; } |
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| 227 | const_iterator end() const { return const_iterator{ data.size(), data }; } |
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| 228 | const_iterator cend() const { return const_iterator{ data.size(), data }; } |
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| 229 | |
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| 230 | iterator find( size_type i ) { return i < size() ? iterator{ i, data } : end(); } |
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| 231 | const_iterator find( size_type i ) const { return i < size() ? const_iterator{ i, data } : end(); } |
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| 232 | }; |
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| 233 | |
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[97d246d] | 234 | template<typename T> |
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| 235 | typename VectorMap<T>::iterator operator+ (typename VectorMap<T>::difference_type i, |
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| 236 | const typename VectorMap<T>::iterator& it) { |
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| 237 | return it + i; |
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| 238 | } |
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| 239 | |
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| 240 | template<typename T> |
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| 241 | typename VectorMap<T>::const_iterator operator+ (typename VectorMap<T>::difference_type i, |
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| 242 | const typename VectorMap<T>::const_iterator& it) { |
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| 243 | return it + i; |
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| 244 | } |
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| 245 | |
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[fa2de95] | 246 | // Local Variables: // |
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| 247 | // tab-width: 4 // |
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| 248 | // mode: c++ // |
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| 249 | // compile-command: "make install" // |
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| 250 | // End: // |
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