Simple Smart Pointer CLass for C++

Ptr.h

/*
 * The MIT License
 *
 * Copyright 2016 twisterge.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/*
 * File:   Ptr.h
 * Author: twisterge
 *
 * Created on December 8, 2016, 11:57 PM
 */

#ifndef PTR_H
#define PTR_H

typedef unsigned int uint;
#define SAFE_DELETE(x) if (x) { delete x; x = nullptr; }

class ReferenceCounter {
public:
	void AddReference() { m_refs++; }
	int Release() { return m_refs--; }

	int GetReferenceCount() const { return m_refs; }
private:
	uint m_refs;
};

template <typename T>
class Ptr {
public:
	Ptr()
		: m_data(nullptr), m_refCounter(nullptr)
	{
		m_refCounter = new ReferenceCounter();
		m_refCounter->AddReference();
	}

	Ptr(T* val)
		: m_data(val), m_refCounter(nullptr)
	{
		m_refCounter = new ReferenceCounter();
		m_refCounter->AddReference();
	}

	Ptr(const Ptr<T>& v)
		: m_data(v.m_data), m_refCounter(v.m_refCounter)
	{
		m_refCounter->AddReference();
	}

	~Ptr() {
		if (m_refCounter->Release() <= 0) {
			SAFE_DELETE(m_data);
			SAFE_DELETE(m_refCounter);
		}
	}

	T& operator* () {
		return *m_data;
	}

	T& operator* () const {
		return *m_data;
	}

	T* operator-> () {
		return m_data;
	}

	T* operator-> () const {
		return m_data;
	}

	explicit operator T*() {
		m_refCounter->AddReference();
		return m_data;
	}

	operator bool() {
		return m_data != nullptr;
	}

	operator bool() const {
		return m_data != nullptr;
	}

	bool operator !() {
		return !m_data;
	}

	bool operator !() const {
		return !m_data;
	}

	Ptr<T>& operator= (const Ptr<T>& v) {
		if (this != &v) {
			if (m_refCounter->Release() <= 0) {
				SAFE_DELETE(m_data);
				SAFE_DELETE(m_refCounter);
			}
			m_data = v.m_data;
			m_refCounter = v.m_refCounter;
			m_refCounter->AddReference();
		}
		return *this;
	}

	bool operator ==(const Ptr<T>& v) {
		return m_data == v.m_data;
	}

	bool operator !=(const Ptr<T>& v) {
		return m_data != v.m_data;
	}

	bool operator ==(T* v) {
		return m_data == v;
	}

	bool operator !=(T* v) {
		return m_data != v;
	}
private:
	T* m_data;
	ReferenceCounter* m_refCounter;
};

#endif // PTR_H