C++指针运算符重载(智能指针)

版权声明： https://blog.csdn.net/qq_40794602/article/details/85228744

• 如果有new出来的程序对象需要程序员自己去释放(delete)
• 有了智能指针，就可以让智能指针去托管这个对象，不用去担心内存泄露的问题

#include<iostream>
using namespace std;

class Test
{
public:
	Test()
	{
		m_a = 999;
	}
	void show()
	{
		cout << "m_a:" << m_a << endl;
	}

	int m_a;
};

class smartPointer
{
public:

	smartPointer(Test *p)
	{
		p_Test = p;
	}

	Test*& operator->()
	{
		return p_Test;
	}

	Test& operator*()
	{
		return *p_Test;
	}
	~smartPointer()
	{
		cout << "智能指针析构\n";
		if (p_Test != NULL)
		{
			delete p_Test;
			p_Test = NULL;
		}
	}
private:
	Test* p_Test;
};

void test()
{
	smartPointer p(new Test);
	p->show();  //p->->show();编译器进行了优化
	(*p).show();
}

int main()
{
	test();
	return 0;
}