copyconstructors.cpp

数据结构的拷贝 利用C++ 实现数据结构的拷贝 从中了解数据结构的参数传递

#include <iostream>

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

private:
	int *itsAge;
	int *itsWeight;
};

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

}

CAT::CAT(const CAT &rhs)
{
    itsAge = new int;
	itsWeight = new int;
	*itsAge = rhs.GetAge() ;
	*itsWeight = rhs.GetWeight() ;
}

CAT::~CAT()
{
    delete itsAge;
	itsAge = 0 ;
	delete itsWeight;
	itsWeight = 0 ;

}

/*CAT::~CAT()
{}*/

int main()
{
    CAT frisky;
	std::cout << "frisky's age: " << frisky.GetAge() << "\n";
	std::cout << "Setting frisky to 6...\n";
	frisky.SetAge(6);
	std::cout << "Creating boots from frisky\n";
	CAT boots(frisky);
	std::cout << "frisky's age: " << frisky.GetAge() << "\n";
	std::cout << "boots' age:" << boots.GetAge() << "\n";
	std::cout << "Setting frisky to 7...";
    frisky.SetAge(7);
    std::cout << "frisky's age: " << frisky.GetAge() << "\n";
	std::cout << "boots' age:" << boots.GetAge() << "\n";
	return 0;




}