C++深拷贝与浅拷贝的区别及应用

	//拷贝构造函数
	Vector(const Vector<T>& v)
		:_start(nullptr)
		,_finish(nullptr)
		,_endOfStorage(nullptr)
	{
		_start=v._start;
		_finish=v._finish;
		_endOfStorage=v._endOfStorage;
	}

 Vector(const Vector<T>& v)
	
		:_start(nullptr)
		, _finish(nullptr)
		, _endOfStorage(nullptr)
	{
		size_t n = v.capacity();
		_start = new T[n];
		for (size_t i = 0; i < v.size(); ++i)
		{
			_start[i] = v[i];
		}
		_finish = _start + v.size();
		_endOfStorage = _start + n;
	}

 template<class T>
class Vector
{
typedef T* operator;
typedef const T* const_iterator;
	iterator _start;
	iterator _finish;
	iterator _endOfStorage;
	
 public:
//构造函数
 Vector()
		:_start(nullptr)
		, _finish(nullptr)
		, _endOfStorage(nullptr)
	{}

	//析构函数
	~Vector()
	{
		if(_start)
		{
			delete[] _start;
			_star=_finish=_endOfStorage=nullptr;
		}
	}
T& operator[](size_t pos)
	{
		if (pos >= 0 && pos < size())
			return _start[pos];
	}
size_t size() const
{
	return _finish - _start;
}
 
size_t capacity() const
{
	return _endOfStorage - _start;
}


};

#include <iOStream>

using namespace std;

class Person
{
public:
    Person() {
        cout << "Person的默认构造函数调用"<<endl;
    }
    Person(int age,int height) {
        m_Age = age;
        m_Height = new int(height);//堆区重新申请空间，进行深拷贝，手动申请，手动释放；
        cout << "Person的有参函数调用" << endl;
    }
    int m_Age;
    int *m_Height;

    //自己实现拷贝构造函数，来避免编译器的拷贝构造函数造成浅拷贝问题；
    Person(const Person& p) {
        cout << "Person拷贝构造函数" << endl;
        m_Age = p.m_Age;
        //m_Height = p.m_Height; 浅拷贝，编译器默认实现这行代码；
        m_Height = new int(*p.m_Height);//深拷贝
    }

    ~Person() {
        //析构代码，将堆区开辟数据做释放操作
        if (m_Height != NULL) {
            delete m_Height;
            m_Height = NULL;
        }
        cout << "Person的析构函数调用" << endl;
    }
};

void test01(){
    Person p1(18,160);
    cout << "p1的年龄为：" << p1.m_Age<<"p1身高为："<<*p1.m_Height<< endl;
    Person p2(p1);//编译器默认调用拷贝构造函数，进行浅拷贝操作
    cout << "p2的年龄为：" << p2.m_Age<< "p2身高为："<<*p2.m_Height << endl;
}

int main(){
    test01();
    system("pause");
}