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18_using_change_visit.cpp
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91 lines (66 loc) · 1.41 KB
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//
// Created by hash on 2020/6/23.
//
#include "iostream"
using namespace std;
class Base {
public :
Base() : value(11) {}
virtual ~Base() {}
void baseTest() {
cout << "Base test" << endl;
}
protected:
int value; // 受保护的
};
// 默认为私有继承，
class Sample : Base {
public :
void sampleTest() {
cout << "Base value protected can be visit by Sample = " << value << endl;
}
using Base::value;
};
class Base1 {
public:
Base1() : values(29) {
}
virtual ~Base1() {
}
void baseTest1() {
cout << "Base1 test" << endl;
}
private:
int values;//私有
};
class Sample1 : private Base1 {
public :
// using Base1::values;骗子。无法使用
};
class Base2 {
public:
Base2() : value(20) {}
virtual ~Base2() {}
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 : Base2 {
public:
// using Base2::value;// 无法访问父类的私有成员
void test2() {
// cout << "value is " << value << endl;
}
};
int main() {
Derived d;
// d.test2();// error
Sample s;
s.sampleTest();
return 0;
}