Overload operator plus (=)

转载于 2012-08-23 12:51:19 发布 · 682 阅读

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本文介绍了一个使用动态内存分配的 C++ 类，并展示了如何实现拷贝赋值运算符来正确处理对象间的资源复制，避免内存泄漏等问题。

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#include <iostream>

class MyType
{
public:
	MyType(); 
	int GetAge() const { return *itsAge; }
	int GetWeight() const { return *itsWeight; }
	void SetAge(int age) { *itsAge = age; }
	MyType operator=(const MyType &);
	
private:
	int *itsAge;
	int *itsWeight;
};

MyType::MyType()
{
	itsAge = new int;
	itsWeight = new int;
	*itsAge = 5;
	*itsWeight = 9;
}


MyType MyType::operator=(const MyType & rhs)
{
	if (this == &rhs)
		return *this;
	delete itsAge;
	delete itsWeight;
	itsAge = new int;
	itsWeight = new int;
	*itsAge = rhs.GetAge();
	*itsWeight = rhs.GetWeight();
	return *this;
}


int main()
{
	MyType myObject;
	std::cout << "myObject's age: " << myObject.GetAge() << std::endl;
	std::cout << "Setting myObject to 6...\n";
	myObject.SetAge(6);
	MyType whiskers;
	std::cout << "whiskers' age: " << whiskers.GetAge() << std::endl;
	std::cout << "copying myObject to whiskers...\n";
	whiskers = myObject;
	std::cout << "whiskers' age: " << whiskers.GetAge() << std::endl;
	return 0;
 }