zhangxing
49 lines
914 B
C++
49 lines
914 B
C++
#include <iostream>
|
|
|
|
using namespace std;
|
|
|
|
class Base1 {
|
|
public:
|
|
Base1() : value(10) {}
|
|
virtual ~Base1() {}
|
|
void test1() { cout << "Base test1..." << endl; }
|
|
|
|
protected: // 保护
|
|
int value;
|
|
};
|
|
// 默认为私有继承
|
|
class Derived1 : Base1 {
|
|
public:
|
|
void test2() { cout << "value is " << value << endl; }
|
|
};
|
|
|
|
class Base {
|
|
public:
|
|
Base() : value(20) {}
|
|
virtual ~Base() {}
|
|
void test1() { cout << "Base test1..." << endl; }
|
|
|
|
private: // 私有
|
|
int value;
|
|
};
|
|
|
|
/**
|
|
* 子类对父类成员的访问权限跟如何继承没有任何关系，
|
|
* “子类可以访问父类的public和protected成员，不可以访问父类的private成员”——这句话对任何一种继承都是成立的。
|
|
*
|
|
*/
|
|
class Derived : Base {
|
|
public:
|
|
using Base::value;
|
|
void test2() { cout << "value is " << value << endl; }
|
|
};
|
|
|
|
int main() {
|
|
Derived1 d1;
|
|
d1.test2();
|
|
|
|
Derived d;
|
|
d.test2();
|
|
return 0;
|
|
}
|