系统会自动生成浅拷贝，就相当于直接赋值

#include "iostream"using namespace std;class base
{
public:base(int a, int b) : a(a), b(b){}int a;int b;
};
int main()
{base newbase1(10, 20);base newbase2 = newbase1;cout << newbase1.a << endl;cout << newbase1.b << endl;cout << newbase2.a << endl;cout << newbase2.b << endl;
}

重写拷贝构造函数（浅拷贝）

#include "iostream"using namespace std;class base
{
public:base(int a, int b) : a(a), b(b){}base(base &a){cout << "重写拷贝构造" << endl;}int a;int b;
};
int main()
{base newbase1(10, 20);base newbase2 = newbase1;
}