以下代码有 4 个类:Base1、Derived1(派生自 Base1)、Base2、Derived2(派生自 Base2)。两个基类都有整数 data1 和 display_data() 函数。两个派生类都有整数 data1 和 data2,以及 display_data() 函数。
我在我的代码中尝试了 4 种情况,可以在 main 函数中看到。我无法确定其中哪些是静态绑定的情况,哪些是动态的。我需要一些帮助。我也想知道,这些情况中的哪些可以被认为是“函数覆盖”。
代码:
#include <iostream>
using namespace std;
class Base1{
protected:
int data1;
public:
Base1(int idata1 = 0) {
data1 = idata1;
}
void display_data() {
cout << "Base1: " << data1 << endl;
}
};
class Derived1 : public Base1 {
protected:
int data2;
public:
Derived1(int idata1 = 0, int idata2 = 0) {
data1 = idata1;
data2 = idata2;
}
void display_data() {
cout << "Derived1: " << data1 << ' ' << data2 << endl;
}
};
class Base2 {
protected:
int data1;
public:
Base2(int idata1 = 0) {
data1 = idata1;
}
virtual void display_data() {
cout << "Base2: " << data1 << endl;
}
};
class Derived2 : public Base2 {
protected:
int data2;
public:
Derived2(int idata1 = 0, int idata2 = 0) {
data1 = idata1;
data2 = idata2;
}
void display_data() {
cout << "Derived2: " << data1 << ' ' << data2 << endl;
}
};
int main()
{
// case 1
Derived1 d1(1, 10);
d1.display_data();
// case 2
Base1* d2 = new Derived1(2, 20);
d2->display_data();
// case 3
Derived2 d3(3, 30);
d3.display_data();
// case 4
Base2* d4 = new Derived2(4, 40);
d4->display_data();
return 0;
}
输出:
Derived1: 1 10
Base1: 2
Derived2: 3 30
Derived2: 4 40