did most of the misc stuff just need < and ==

Map.hpp

@@ -7,6 +7,7 @@
 #include <iostream>
 #include <memory>
 #include <optional>
+#include <stdexcept>
 #include <utility>
 namespace cs440 {
 // universal type defs here
@@ -47,12 +48,17 @@ template <typename Key_T, typename Mapped_T> class Map {
           left{std::make_unique<Node>(*rhs.left)},
           right{std::make_unique<Node>(*rhs.right)}, color{rhs.color},
           prev{nullptr}, next{nullptr}, map{rhs.map} {
+      this->valid = 0x13371337;
+
       if (this->left) {
         this->left->parent = this;
       }
       if (this->right) {
         this->right->parent = this;
       }
+
+      this->next = rhs.next;
+      this->prev = rhs.prev;
     }
     Node(Node &&rhs)
         : parent{nullptr}, val{std::move(rhs.val)}, left{std::move(rhs.left)},
@@ -72,17 +78,22 @@ template <typename Key_T, typename Mapped_T> class Map {
       if (this->right) {
         this->right->parent = this;
       }
+
+      this->next = rhs.next;
+      this->prev = rhs.prev;
     }
     ~Node() {}
     Node &operator=(const Node &rhs) {
       // retain parent as is, common case is the copy or move is happening due
       // to a rotation where parent can get wonky
       // this->parent
+
       this->val = rhs.val;
       this->left = std::make_unique<Node>(*rhs.left);
       this->right = std::make_unique<Node>(*rhs.right);
       this->color = rhs.color;
       this->valid = 0x13371337;
+
       if (this->left) {
         this->left->parent = this;
         this->left->restore_ordering();
@@ -91,7 +102,7 @@ template <typename Key_T, typename Mapped_T> class Map {
         this->right->parent = this;
         this->right->restore_ordering();
       }
-
+      this->restore_ordering();
       this->map = rhs.map;
       return *this;
     }
@@ -113,6 +124,7 @@ template <typename Key_T, typename Mapped_T> class Map {
         this->right->parent = this;
         this->right->restore_ordering();
       }
+      this->restore_ordering();
       this->map = rhs.map;
       return *this;
     }
@@ -126,6 +138,16 @@ template <typename Key_T, typename Mapped_T> class Map {
         assert(false);
       }
     }
+    Node const *child(Direction dir) const {
+      switch (dir) {
+      case Direction::Left:
+        return this->left.get();
+      case Direction::Right:
+        return this->right.get();
+      default:
+        assert(false);
+      }
+    }
     std::unique_ptr<Node> uchild(Direction dir) {
       switch (dir) {
       case Direction::Left:
@@ -174,6 +196,8 @@ template <typename Key_T, typename Mapped_T> class Map {
     }
     void erase_child(Node *n) { this->erase_child(this->which_child(n)); }
     void erase_child(Direction dir) {
+      bool minmax = this->child(dir) == this->map->min ||
+                    this->child(dir) == this->map->max;
       // bringing ownership to this function scope so Deleter gets called at end
       // of function and we can do reordering things
       std::unique_ptr<Node> dropping;
@@ -197,6 +221,18 @@ template <typename Key_T, typename Mapped_T> class Map {
       if (dropping->next != nullptr) {
         dropping->next->prev = dropping->prev;
       }
+
+      if (minmax) {
+        switch (dir) {
+        case Direction::Left:
+          this->map->min = this;
+          break;
+        case Direction::Right:
+          this->map->max = this;
+          break;
+          assert(false);
+        }
+      }
     }
     void restore_ordering() {
       this->prev = this->calc_pred();
@@ -344,6 +380,8 @@ template <typename Key_T, typename Mapped_T> class Map {
 
 public:
   friend Node;
+  class ConstIterator;
+  class ReverseIterator;
   // public type definitions
   class Iterator {
     Node *underlying;
@@ -353,34 +391,146 @@ public:
 
   public:
     friend Map;
+    friend ConstIterator;
+    friend ReverseIterator;
     Iterator() = delete;
-    void check() {
+    Iterator(const Iterator &rhs) = default;
+    Iterator &operator=(const Iterator &) = default;
+    ~Iterator() = default;
+    // precrement
+    Iterator &operator++() {
       if (this->underlying == nullptr) {
-        return;
+        this->underlying = this->store;
+        this->store = nullptr;
+        return *this;
       }
-      if (this->underlying->parent) {
+      if (this->underlying->next == nullptr) {
-        switch (this->underlying->parent->which_child(this->underlying)) {
+        this->store = this->underlying;
-        case Direction::Left:
-          assert(this->underlying->val.first <
-                 this->underlying->parent->val.first);
-          break;
-        case Direction::Right:
-          assert(this->underlying->val.first >
-                 this->underlying->parent->val.first);
-          break;
-        default:
-          assert(false);
       }
+      this->underlying = this->underlying->next;
+      return *this;
     }
-      if (this->underlying->right) {
+    // postcrement
-        assert(this->underlying->right->val.first >
+    Iterator operator++(int) {
-               this->underlying->val.first);
+      auto copy = *this;
+      this->operator++();
+      return copy;
     }
-      if (this->underlying->left) {
+
-        assert(this->underlying->left->val.first < this->underlying->val.first);
+    // precrement
+    Iterator &operator--() {
+      if (this->underlying == nullptr) {
+        this->underlying = this->store;
+        this->store = nullptr;
+        return *this;
       }
+      if (this->underlying->prev == nullptr) {
+        this->store = this->underlying;
+      }
+      this->underlying = this->underlying->prev;
+      return *this;
+    }
+    // postcrement
+    Iterator operator--(int) {
+      auto copy = *this;
+      this->operator--();
+      return copy;
+    }
+
+    ValueType &operator*() const {
+      ValueType *ret = (ValueType *)(&this->underlying->val);
+      return *ret;
+    }
+    ValueType *operator->() const { return &this->operator*(); }
+    friend bool operator==(const Iterator &lhs, const Iterator &rhs) {
+      return lhs.underlying == rhs.underlying;
+    }
+    friend bool operator!=(const Iterator &lhs, const Iterator &rhs) {
+      return !(lhs == rhs);
     }
   };
+  class ConstIterator {
+    Iterator underlying;
+
+  public:
+    friend Map;
+    ConstIterator() = delete;
+    ConstIterator(const Iterator &underlying) : underlying{underlying} {}
+    ConstIterator(const ConstIterator &rhs) = default;
+    ConstIterator &operator=(const ConstIterator &) = default;
+    ~ConstIterator() = default;
+    ConstIterator &operator++() {
+      ++underlying;
+      return *this;
+    }
+    ConstIterator operator++(int) {
+      auto copy = *this;
+      this->operator++();
+      return copy;
+    }
+    ConstIterator &operator--() {
+      --underlying;
+      return *this;
+    }
+    ConstIterator operator--(int) {
+      auto copy = *this;
+      this->operator--();
+      return copy;
+    }
+    const ValueType &operator*() const { return this->underlying.operator*(); }
+    const ValueType *operator->() const { return &this->operator*(); }
+
+    friend bool operator==(const ConstIterator &lhs, const ConstIterator &rhs) {
+      return lhs.underlying == rhs.underlying;
+    }
+    friend bool operator!=(const ConstIterator &lhs, const ConstIterator &rhs) {
+      return !(lhs == rhs);
+    }
+    friend bool operator==(const Iterator &lhs, const ConstIterator &rhs) {
+      return lhs == rhs.underlying;
+    }
+    friend bool operator!=(const Iterator &lhs, const ConstIterator &rhs) {
+      return !(lhs == rhs);
+    }
+    friend bool operator==(const ConstIterator &lhs, const Iterator &rhs) {
+      return lhs.underlying == rhs;
+    }
+    friend bool operator!=(const ConstIterator &lhs, const Iterator &rhs) {
+      return !(lhs == rhs);
+    }
+  };
+  class ReverseIterator {
+    Iterator underlying;
+    ReverseIterator(const Iterator &underlying) : underlying{underlying} {}
+
+  public:
+    friend Map;
+    ReverseIterator() = delete;
+    ReverseIterator(const ReverseIterator &) = default;
+    ~ReverseIterator() = default;
+    ReverseIterator &operator=(const ReverseIterator &) = default;
+    ReverseIterator &operator++() {
+      --underlying;
+      return *this;
+    }
+    ReverseIterator operator++(int) {
+      auto copy = *this;
+      this->operator++();
+      return copy;
+    }
+    ReverseIterator &operator--() {
+      ++underlying;
+      return *this;
+    }
+    ReverseIterator operator--(int) {
+      auto copy = *this;
+      this->operator++();
+      return copy;
+    }
+    const ValueType &operator*() const { return this->underlying.operator*(); }
+    const ValueType *operator->() const { return &this->operator*(); }
+  };
+
   Map() : root{}, _size{0} {}
   Map(const Map &rhs) : root{rhs.root}, _size{rhs._size} {}
   Map(Map &&rhs) : root{std::move(rhs.root)}, _size{rhs._size} {}
@@ -394,10 +544,14 @@ public:
     this->_size = rhs._size;
     return *this;
   }
+  Map(std::initializer_list<std::pair<const Key_T, Mapped_T>> items) : Map{} {
+    this->insert(items.begin(), items.end());
+  }
   void check() {
     assert(!this->root || this->root.value().color == Color::Black);
   }
   std::size_t size() { return this->_size; }
+  bool empty() { return this->size() == 0; }
 
 private:
   // private helpers
@@ -421,18 +575,32 @@ private:
     if (old_root->right) {
       old_root->right->parent = old_root.get();
     }
+    if (old_root->next) {
+      old_root->next->prev = old_root.get();
+    }
+    if (old_root->prev) {
+      old_root->prev->next = old_root.get();
+    }
 
     root.value().set_child(dir, std::move(old_root));
+    root.value().child(dir)->restore_ordering();
+
     if (root.value().left) {
       root.value().left->parent = &root.value();
+      if (min == &root.value()) {
+        min = root.value().left.get();
+      }
     }
     if (root.value().right) {
       root.value().right->parent = &root.value();
+      if (max == &root.value()) {
+        max = root.value().right.get();
+      }
     }
   }
   template <bool trace = false>
-  std::pair<Node *, Direction> locate(const Key_T &key) {
+  std::pair<Node const *, Direction> locate(const Key_T &key) const {
-    Node *ret_parent;
+    Node const *ret_parent;
     Direction ret_dir;
     // map is empty
     if (!this->root.has_value()) {
@@ -639,22 +807,22 @@ public:
       return this->end();
     }
     if (parent->child(dir) != nullptr) {
-      return Iterator{parent->child(dir), nullptr};
+      return Iterator{const_cast<Node *>(parent->child(dir)), nullptr};
     }
     return this->end();
   }
-  Iterator find_trace(const Key_T &key) {
+  ConstIterator find(const Key_T &key) const {
-    auto [parent, dir] = locate<true>(key);
+    auto [parent, dir] = locate(key);
     if (parent == nullptr) {
       if (this->root.has_value()) {
         if (this->root.value().val.first == key) {
-          return Iterator{&this->root.value()};
+          return Iterator{const_cast<Node *>(&this->root.value())};
         }
       }
       return this->end();
     }
     if (parent->child(dir) != nullptr) {
-      return Iterator{parent->child(dir), nullptr};
+      return Iterator{const_cast<Node *>(parent->child(dir)), nullptr};
     }
     return this->end();
   }
@@ -671,6 +839,9 @@ public:
       } else {
         this->root = Node{val, this};
         this->root.value().color = Color::Black;
+        this->min = &this->root.value();
+        this->max = &this->root.value();
+        this->_size++;
         return std::make_pair(Iterator{&root.value()}, true);
       }
     }
@@ -678,21 +849,35 @@ public:
     // non-root node
     if (parent->child(dir)) {
       // node already present
-      return std::make_pair(Iterator{parent->child(dir)}, false);
+      return std::make_pair(Iterator{const_cast<Node *>(parent->child(dir))},
+                            false);
     }
 
     // need to insert non-root node
-    Node *new_node =
+    Map *m = const_cast<Map *>(this);
-        parent->set_child(dir, std::make_unique<Node>(Node{val, this})).get();
+    Node *new_node = const_cast<Node *>(parent)
+                         ->set_child(dir, std::make_unique<Node>(Node{val, m}))
+                         .get();
     new_node->restore_red_black_insert(dir);
 
     new_node->restore_ordering();
+    if (this->min == parent && dir == Direction::Left) {
+      this->min = new_node;
+    }
+    if (this->max == parent && dir == Direction::Right) {
+      this->max = new_node;
+    }
+    this->_size++;
     return std::make_pair(Iterator{new_node}, true);
   }
   void erase(Iterator pos) {
+    if (pos.underlying == nullptr) {
+      return;
+    }
+    this->_size--;
+
     Node *before = pos.underlying->prev;
     Node *after = pos.underlying->next;
-
     if (core_erase(pos.underlying)) {
       pos.underlying->restore_ordering();
     } else {
@@ -701,12 +886,16 @@ public:
         if (before->next != nullptr) {
           before->next->prev = before;
         }
+      } else {
+        this->min = after;
       }
       if (after != nullptr) {
         after->prev = after->calc_pred();
         if (after->prev != nullptr) {
           after->prev->next = after;
         }
+      } else {
+        this->max = before;
       }
     }
   }
@@ -714,6 +903,46 @@ public:
   // baseline iterator creation
   Iterator begin() { return Iterator{min, nullptr}; }
   Iterator end() { return Iterator{nullptr, max}; }
+  ConstIterator begin() const { return Iterator{min, nullptr}; }
+  ConstIterator end() const { return Iterator{nullptr, max}; }
+  ReverseIterator rbegin() { return Iterator{max, nullptr}; }
+  ReverseIterator rend() { return Iterator{nullptr, min}; }
+
+  // misc that can be implemented with the above or trivially
+  void clear() {
+    this->root = std::move(std::nullopt);
+    this->_size = 0;
+  }
+  Mapped_T &at(const Key_T &key) {
+    auto ret = this->find(key);
+    if (ret == this->end()) {
+      throw std::out_of_range{"key not in map"};
+    }
+    return (*ret).second;
+  }
+  const Mapped_T &at(const Key_T &key) const {
+    auto ret = this->find(key);
+    if (ret == this->end()) {
+      throw std::out_of_range{"key not in map"};
+    }
+    return (*ret).first;
+  }
+  Mapped_T &operator[](const Key_T &key) {
+    this->insert({key, {}});
+    return this->at(key);
+  }
+  template <typename IT_T> void insert(IT_T range_beg, IT_T range_end) {
+    while (range_beg != range_end) {
+      auto [first, second] = *range_beg;
+      this->insert(std::make_pair(first, second));
+      ++range_beg;
+    }
+  }
+  void erase(const Key_T &key) { this->erase(this->find(key)); }
+  // TODO:
+  friend bool operator==(const Map &lhs, const Map &rhs) { assert(false); }
+  friend bool operator!=(const Map &lhs, const Map &rhs) { assert(false); }
+  friend bool operator<(const Map &lhs, const Map &rhs) { assert(false); }
 };
 } // namespace cs440
 #endif

t.cpp

@@ -1,22 +1,20 @@
 #include "Map.hpp"
+#include <utility>
 
 template class cs440::Map<int, int>;
 int main(void) {
-  cs440::Map<int, int> a;
+  // cs440::Map<int, int> a;
-  for (std::size_t i = 1; i <= 10; i++) {
+  // for (std::size_t i = 10; i >= 1; i--) {
-    a.insert({i, i});
+  //   a.insert({i, i});
-    a.check();
+  //   for (std::size_t j = 10; j >= i; j--) {
-    for (std::size_t j = 1; j <= i; j++) {
+  //   }
-      a.find(j).check();
+  // }
-    }
+  // for (std::size_t i = 10; i >= 5; i--) {
-  }
+  //   std::cout << i << std::endl;
-  for (std::size_t i = 1; i <= 10; i++) {
+  //   auto b = a.find(i);
-    a.find(i).check();
+  //   a.erase(b);
-  }
+  //   for (std::size_t j = 1; j <= i; j++) {
-  for (std::size_t i = 1; i <= 5; i++) {
+  //   }
-    std::cout << i << std::endl;
+  // }
-    auto b = a.find(i);
-    a.erase(b);
-  }
   return 0;
 }