引用的方式覆盖

#include "iostream"
using namespace std;
class base
{
public:base() {}base(int a, int b) : a(a), b(b){}int a;int b;
};
class step1 : public ::base
{
public:step1() {}
};int main()
{step1 rlxy;rlxy.a = 100;rlxy.b = 200;cout << rlxy.a << endl;cout << rlxy.b << endl;base &ccc = rlxy;cout << ccc.a << endl;cout << ccc.b << endl;
}

赋值的方式覆盖

#include "iostream"using namespace std;class base
{
public:base() {}base(int a, int b) : a(a), b(b){}int a;int b;
};class step1 : public ::base
{
public:step1() {}
};int main()
{step1 rlxy;rlxy.a = 100;rlxy.b = 200;cout << rlxy.a << endl;cout << rlxy.b << endl;base ccc = rlxy;cout << ccc.a << endl;cout << ccc.b << endl;}