Brian Escobar / pa1

File was created	1	#ifndef BST_HPP
	2	#define BST_HPP
	3	#include "BSTNode.hpp"
	4	#include "BSTIterator.hpp"
	5	#include <utility> // for std::pair
	6
	7	template<typename Data>
	8	class BST {
	9
	10	protected:
	11
	12	/** Pointer to the root of this BST, or nullptr if the BST is empty */
	13	BSTNode<Data>* root;
	14
	15	/** Number of Data items stored in this BST. */
	16	unsigned int isize;
	17
	18
	19	public:
	20
	21	/** iterator is an aliased typename for BSTIterator<Data>. */
	22	typedef BSTIterator<Data> iterator;
	23
	24	/** Default constructor.
	25	Initialize an empty BST.
	26	*/
	27	BST() : root(nullptr), isize(0) {
	28	}
	29
	30
	31	/** Default destructor.
	32	* It is virtual, to allow appropriate destruction of subclass objects.
	33	* Delete every node in this BST.
	34	*/ // TODO
	35	virtual ~BST() {
	36
	37	}
	38
	39	/** Insert a Data item in the BST.
	40	* Return a pair, with the pair's first member set to an
	41	* iterator pointing to either the newly inserted element
	42	* or to the equivalent element already in the set.
	43	* The pair's second element is set to true
	44	* if a new element was inserted or false if an
	45	* equivalent element already existed.
	46	*/ // TODO
	47	virtual std::pair<iterator,bool> insert(const Data& item) {
	48
	49	}
	50
	51
	52	/** Find a Data item in the BST.
	53	* Return an iterator pointing to the item, or the end
	54	* iterator if the item is not in the BST.
	55	*/ // TODO
	56	iterator find(const Data& item) const {
	57
	58	}
	59
	60
	61	/** Return the number of items currently in the BST.
	62	*/ // TODO
	63	unsigned int size() const {
	64
	65	}
	66

File was created	1	#ifndef BSTITERATOR_HPP
	2	#define BSTITERATOR_HPP
	3	#include "BSTNode.hpp"
	4	#include <list>
	5	#include <iterator>
	6
	7	// declare BST here, so friend declaration below will work.
	8	template<typename X> class BST;
	9
	10	template<typename Data>
	11	class BSTIterator : public std::iterator<std::input_iterator_tag,Data> {
	12
	13	private:
	14
	15	BSTNode<Data>* curr; // pointer to this BSTIterator's current BSTNode
	16
	17	/** Constructor. Use the argument to initialize a given BSTNode
	18	* in this BSTIterator.
	19	* Note: this constructor is private; but friend classes can access.
	20	*/ // TODO
	21	BSTIterator(BSTNode<Data>* curr) {
	22	}
	23
	24
	25	public:
	26	// make BST a friend class, so BST can create a BSTIterator when needed.
	27	friend class BST<Data>;
	28	// make BSTNode a friend class, so BSTNode can access curr member variable.
	29	friend class BSTNode<Data>;
	30
	31
	32	/** Dereference operator.
	33	* Return a copy of the Data item in the current BSTNode.
	34	*/
	35	Data operator*() const {
	36	return curr->data;
	37	}
	38
	39	/** Pre-increment operator.
	40	* Update this BSTIterator to point to the inorder successor of the current
	41	* BSTNode, and return a reference to the updated BSTIterator.
	42	*/
	43	BSTIterator<Data>& operator++() {
	44	curr = curr->successor();
	45	return *this;
	46	}
	47
	48	/** Post-increment operator.
	49	* Update this BSTIterator to point to the inorder successor of the current
	50	* BSTNode, and return a copy of the old, non-updated BSTIterator.
	51	*/
	52	BSTIterator<Data> operator++(int) {
	53	BSTIterator before = BSTIterator(curr);

File was created	1	#ifndef BSTNODE_HPP
	2	#define BSTNODE_HPP
	3	#include <iostream>
	4	#include <iomanip>
	5
	6
	7	/** This class template defines a node type for the BST container.
	8	* Note that all members are public. So, the BST implementation should
	9	* take care not to expose any BSTNode objects.
	10	*/
	11	template<typename Data>
	12	class BSTNode {
	13
	14	public:
	15
	16	/** Member variables. */
	17	BSTNode<Data>* parent;
	18	BSTNode<Data>* left;
	19	BSTNode<Data>* right;
	20	const Data data; // the const Data in this node
	21	int info; // variable used in advanced algorithms
	22
	23	/** Constructor. Initialize a BSTNode with the given Data item,
	24	* no parent, and no children.
	25	*/
	26	BSTNode(const Data & d): data(d) {
	27	left = right = parent = nullptr;
	28	}
	29
	30
	31	/** Return the inorder successor of this BSTNode in a BST,
	32	* or nullptr if none.
	33	* PRECONDITION: this BSTNode is a node in a BST.
	34	* POSTCONDITION: the BST is unchanged.
	35	* RETURNS: the BSTNode that is the inorder successor of this BSTNode,
	36	* or nullptr if there is none.
	37	*/ // TODO
	38	BSTNode<Data>* successor() {
	39
	40	}
	41
	42	};
	43
	44	/** Overload operator<< to insert a BSTNode's fields in an ostream. */
	45	template <typename Data>
	46	std::ostream & operator<<(std::ostream& stm, const BSTNode<Data> & n) {
	47	stm << '[';

File was created	1	# A simple makefile for CSE 100 P1
	2
	3	#use g++ for everything
	4	CC= g++
	5
	6	# include debugging symbols in object files,
	7	# and enable all warnings
	8	CXXFLAGS= -std=c++11 -O2 -g -Wall
	9
	10	#include debugging symbols in executable
	11	LDFLAGS= -g
	12
	13	bst: test_BST.o
	14	g++ -o bst test_BST.o
	15

File was created	1	#include "BST.hpp"
	2	#include <iostream>
	3	#include <algorithm>
	4	#include <vector>
	5
	6	using namespace std;
	7
	8	/**
	9	* A simple test driver for the BST class template.
	10	* P1 CSE 100 2013
	11	* Author: P. Kube (c) 2013
	12	*/
	13	int main() {
	14
	15	/* Create an STL vector of some ints */
	16	vector<int> v;
	17	v.push_back(3);
	18	v.push_back(4);
	19	v.push_back(1);
	20	v.push_back(100);
	21	v.push_back(-33);
	22
	23	/* Create an instance of BST holding int */
	24	BST<int> b;
	25
	26	/* Insert a few data items. */
	27	vector<int>::iterator vit = v.begin();
	28	vector<int>::iterator ven = v.end();
	29	for(; vit != ven; ++vit) {
	30	// all these inserts are unique, so should return a std::pair
	31	// with second part true
	32	std::pair<BST<int>::iterator,bool> pr = b.insert(*vit);
	33	if(! pr.second ) {
	34	cout << "Incorrect bool return value when inserting " << *vit << endl;
	35	return -1;
	36	}
	37	if((pr.first) != vit) {
	38	cout << "Incorrect iterator return value when inserting " << *vit << endl;
	39	return -1;
	40	}
	41	}
	42
	43	/* Test size. */
	44	cout << "Size is: " << b.size() << endl;
	45	if(b.size() != v.size()) {
	46	cout << "... which is incorrect." << endl;
	47	return -1;
	48	}
	49
	50	/* Test find return value. */
	51	vit = v.begin();
	52	for(; vit != ven; ++vit) {
	53	if((b.find(vit)) != *vit) {
	54	cout << "Incorrect return value when finding " << *vit << endl;
	55	return -1;
	56	}
	57	}
	58
	59	/* Sort the vector, to compare with inorder iteration on the BST */
	60	sort(v.begin(),v.end());
	61
	62	/* Test BST iterator; should iterate inorder */
	63	cout << "traversal using iterator:" << endl;
	64	vit = v.begin();
	65	BST<int>::iterator en = b.end();
	66	BST<int>::iterator it = b.begin();
	67	for(; vit != ven; ++vit) {
	68	if(! (it != en) ) {
	69	cout << it << "," << vit << ": Early termination of BST iteration." << endl;
	70	return -1;
	71	}

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Brian Escobar / pa1

PA1: Starter Code