From 112a0d344da9e66d20ee9ab5d488e59c5d52e6ad Mon Sep 17 00:00:00 2001
From: Angeld55 <angel_dimitriev@abv.bg>
Date: Thu, 9 Apr 2020 18:09:42 +0300
Subject: added new examples

---
 Templates/Queue/Queue.hpp | 121 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 Templates/Queue/Queue.hpp

(limited to 'Templates/Queue/Queue.hpp')

diff --git a/Templates/Queue/Queue.hpp b/Templates/Queue/Queue.hpp
new file mode 100644
index 0000000..128f1df
--- /dev/null
+++ b/Templates/Queue/Queue.hpp
@@ -0,0 +1,121 @@
+#ifndef QUEUE_HDR
+#define QUEUE_HDR
+
+#include <iostream>
+using namespace std;
+
+template<typename T>
+class Queue {
+private:
+	T * arr;
+	int capacity;
+	int count;
+
+	int whereToPut;
+	int whereToGet;
+	void Resize();
+	void CopyFrom(const Queue<T>& other);
+	void Free();
+
+public:
+	Queue();
+	Queue(const Queue<T>& other);
+	Queue<T>& operator=(const Queue<T>& other);
+	~Queue();
+
+	bool isEmpty() const;
+	void Push(T el);
+	T Pop();
+	T& Peek();
+};
+
+template <typename T>
+void Queue<T>::Resize() {
+	T* temp = new T[capacity * 2];
+	for (int i = 0; i < capacity; ++i)
+		temp[i] = Pop();
+	whereToGet = 0;
+	whereToPut = capacity;
+	count = capacity;
+	capacity *= 2;
+	delete[] arr;
+	arr = temp;
+}
+
+template <typename T>
+void Queue<T>::CopyFrom(const Queue<T>& other) {
+	arr = new T[other.capacity];
+	for (int i = 0; i < other.count; ++i)
+		arr[i] = other.arr[i];
+	count = other.count;
+	capacity = other.capacity;
+	whereToPut = other.whereToPut;
+	whereToGet = other.whereToGet;
+}
+
+template <typename  T>
+void Queue<T>::Free() {
+	delete[] arr;
+	count = capacity = 0;
+}
+
+template <typename T>
+Queue<T>::Queue() {
+	arr = new T[4];
+	capacity = 4;
+	count = 0;
+	whereToPut = 0;
+	whereToGet = 0;
+}
+
+template <typename T>
+Queue<T>::Queue(const Queue<T>& other) {
+	CopyFrom(other);
+}
+
+template <typename T>
+Queue<T>& Queue<T>::operator=(const Queue<T>& other) {
+	if (this != &other) {
+		Free();
+		CopyFrom(other);
+	}
+	return *this;
+}
+
+template <typename T>
+Queue<T>::~Queue() {
+	Free();
+}
+
+template <typename T>
+bool Queue<T>::isEmpty() const {
+	return count == 0;
+}
+
+template <typename T>
+void Queue<T>::Push(T el) {
+	if (count == capacity)
+		Resize();
+	arr[whereToPut] = el;
+	(whereToPut += 1) %= capacity;
+	count++;
+}
+
+template <typename T>
+T Queue<T>::Pop() {
+	if (count == 0)
+		throw "Queue is empty";
+	T elToReturn = arr[whereToGet];
+	count--;
+	(whereToGet += 1) %= capacity;
+	return  elToReturn;
+}
+
+template <typename T>
+T& Queue<T>::Peek() {
+	if (isEmpty())
+		throw std::logic_error("empty queue");
+	return arr[whereToGet];
+}
+
+#endif // !QUEUE_HDR
-- 
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