#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;
}