1
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 |
#ifndef TRIE_TRIE_HPP
#define TRIE_TRIE_HPP #include <algorithm> #include <cassert> #include <string> template <typename Object, typename Key> class Trie { public: Trie() : node{nullptr}, size{0} { } Trie(const Trie &rhs) : node(rhs.node ? new Node(*rhs.node) : nullptr), size{rhs.size} { } Trie(Trie &&trie) : Trie() { swap(*this, trie); } friend void swap(Trie &lhs, Trie &rhs) { using std::swap; swap(lhs.node, rhs.node); swap(lhs.size, rhs.size); } ~Trie() { delete node; } Trie & operator=(Trie rhs) { swap(*this, rhs); return *this; } Trie & insert(const std::string &key, const Object &obj) { recursive_insert(node, key.c_str(), obj); return *this; } std::size_t get_size() const { return size; } template <typename Visitor> const Trie & visit(const std::string &key, const Visitor &visitor) const { recursive_visit(node, key.c_str(), visitor); return *this; } private: struct Node { Node(const Object *value= nullptr) : node{}, object{nullptr} { if (value) { object = new Object(*value); } } Node(const Node &rhs) : object{nullptr} { if (rhs.object) { object = new Object(*rhs.object); } for (std::size_t i=0; i<Key::size(); ++i) { node[i] = (rhs.node[i]) ? new Node(*rhs.node[i]) : nullptr; } } ~Node() { for (std::size_t i=0; i<Key::size(); ++i) { delete node[i]; } delete object; } Node *node[Key::size()]; Object *object; }; void recursive_insert(Node *&root, const char *c, const Object &value) { if (!root) { root = new Node(); } if (*c) { std::size_t key = Key::map(*c); recursive_insert(root->node[key], c+1, value); } else { if (root->object) { delete root->object; } else { ++size; } root->object = new Object(value); } } template <typename Visitor> void recursive_visit(Node *root, const char *c, const Visitor &visitor) const { if (!root) { return; } if (c && *c) { std::size_t key = Key::map(*c); recursive_visit(root->node[key], c+1, visitor); } else { if (root->object) { visitor(*root->object); } for (std::size_t i=0; i<Key::size(); ++i) { recursive_visit(root->node[i], nullptr, visitor); } } } Node *node; std::size_t size; }; #endif // TRIE_TRIE_HPP |