49 lines
914 B
C++
49 lines
914 B
C++
#include <iostream>
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using namespace std;
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class Base1 {
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public:
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Base1() : value(10) {}
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virtual ~Base1() {}
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void test1() { cout << "Base test1..." << endl; }
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protected: // 保护
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int value;
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};
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// 默认为私有继承
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class Derived1 : Base1 {
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public:
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void test2() { cout << "value is " << value << endl; }
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};
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class Base {
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public:
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Base() : value(20) {}
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virtual ~Base() {}
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void test1() { cout << "Base test1..." << endl; }
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private: // 私有
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int value;
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};
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/**
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* 子类对父类成员的访问权限跟如何继承没有任何关系，
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* “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。
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*
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*/
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class Derived : Base {
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public:
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using Base::value;
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void test2() { cout << "value is " << value << endl; }
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};
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int main() {
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Derived1 d1;
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d1.test2();
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Derived d;
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d.test2();
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return 0;
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}
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