C++(深拷贝与浅拷贝)
深拷贝与浅拷贝
- 浅拷贝:简单的赋值拷贝操作
- 深拷贝:在堆区重新申请空间,进行拷贝操作
示例:
#include <iostream>
using namespace std;
class Person{
public:
//无参构造函数
Person(){
cout<<"无参构造函数!"<<endl;
}
//有参构造函数
Person(int age, int height)
{
cout<<"有参构造函数!"<<endl;
m_age=age;
m_height=new int(height);
}
//拷贝构造函数
Person(const Person &p)
{
cout<<"拷贝构造函数!"<<endl;
//如果不利用深拷贝在堆区常见新内存,会导致浅拷贝带来的重复释放堆区问题
m_age=p.age;
m_height=new int(*p.m_height);
}
//析构函数
~Person()
{
cout<<"析构函数!"<<endl;
if(m_height!=NULL)
{
delete m_height;
m_height=NULL;
}
}
public:
int m_age;
int *m_height;
};
void test01()
{
Person p1(18, 180);
Person p2(p1);
cout << "p1的年龄: " << p1.m_age << " 身高: " << *p1.m_height << endl;
cout << "p2的年龄: " << p2.m_age << " 身高: " << *p2.m_height << endl;
}
int main() {
test01();
system("pause");
return 0;
}