浅拷贝与深拷贝的区别
- 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
默认情况下对象拷贝是浅拷贝(深拷贝要自己实现拷贝函数)
class Person {
public:
//无参(默认)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创建新内存,会导致浅拷贝带来的重复释放堆区问题
m_age = p.m_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;
}
}
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;
}
标签:cout,默认,Person,c++,拷贝,构造函数
From: https://www.cnblogs.com/paylove/p/18307533