Reorganize files

cpp/datastructs/doublelist/doublelist.h

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+/*#############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2020 Shaun Reed, all rights reserved               ##
+## About: An example of a doubly linked list                                 ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
+##############################################################################
+## doublelist.h
+*/
+
+#ifndef DOUBLELIST_H
+#define DOUBLELIST_H
+
+#include <iostream>
+
+class DoubleList {
+  public:
+    DoubleList() : head(NULL) {};
+    DoubleList(const DoubleList& rhs);
+    DoubleList operator=(DoubleList rhs);
+    ~DoubleList();
+    bool insert(int val);
+    bool insert(int val, int key);
+    bool remove(int val);
+    bool replace(int val, int key);
+    void makeEmpty();
+    bool isEmpty() const;
+    int peek() const;
+    void print() const;
+    bool find(int val) const;
+
+  private:
+    struct Node {
+      int data;
+      Node *next, *prev;
+      Node(): data(), next(NULL), prev(NULL) {};
+      Node(int val): data(val), next(NULL), prev(NULL) {};
+    };
+    Node *head;
+    bool insert(int val, Node *&head);
+    bool insert(int val, int key, Node *&head);
+    bool remove(int val, Node *&head);
+    bool replace(int val, int key, Node *&head);
+    Node* find(int val, Node *start) const;
+    void print(Node *start) const;
+};
+
+#endif