private、protected、public

最新推荐文章于 2025-03-30 09:49:36 发布

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最新推荐文章于 2025-03-30 09:49:36 发布

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分类专栏： c++

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本文探讨了C++中不同类型的继承（私有、受保护和公共）如何影响基类成员在派生类中的可访问性。通过具体的代码示例展示了基类成员变量和函数在派生类中的调用方式及其可见性。

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/*************************************************************************
    > File Name: private.cpp
    > Author: 
    > Mail: 
    > Created Time: Sat 16 Apr 2016 11:19:10 PM EDT
 ************************************************************************/

#include<iostream>
using namespace std;


class Base
{
public:
    int base_c;
    void base_fun3() {base_fun2(); base_fun1(); ++base_c; ++base_b; ++base_a;};

protected:
    int base_b;
    void base_fun2() {base_fun1(); base_fun3();++base_c; ++base_b; ++base_a;};
private:
    int base_a;
    void base_fun1() {base_fun3(); base_fun2();++base_c; ++base_b; ++base_a;};
}; 

class Child: private Base
{
public:
    int child_c;
    void child_fun3() {base_fun3(); base_fun2(); /*base_fun1();*/++base_c; ++base_b;/* ++base_a;*/};
protected:
    int child_b;
    void child_fun2() {base_fun3(); base_fun2(); /*base_fun1();*/++base_c; ++base_b;/* ++base_a;*/};
private:
    int child_a;
    void child_fun1() {base_fun3(); base_fun2(); /*base_fun1();*/++base_c; ++base_b;/* ++base_a;*/};
};

int mian()
{
    Base b1;
    cout << b1.base_c << endl;
    b1.base_fun3();
    //cout << b1.base_b << endl;
    //b1.base_fun2();
    //cout << b1.base_a << endl;
    //b1.base_fun1();
    Child c1;
    //cout << c1.base_c << endl;
    //c1.base_fun3();
    //cout << c1.base_b << endl;
    //c1.base_fun2();
    //cout << c1.base_a << endl;
    //c1.base_fun1();
    return 0;
}

/*************************************************************************
    > File Name: protected.cpp
    > Author: 
    > Mail: 
    > Created Time: Sat 16 Apr 2016 11:19:10 PM EDT
 ************************************************************************/

#include<iostream>
using namespace std;


class Base
{
public:
    int base_c;
    void base_fun3() {base_fun2(); base_fun1(); ++base_c; ++base_b; ++base_a;};

protected:
    int base_b;
    void base_fun2() {base_fun1(); base_fun3();++base_c; ++base_b; ++base_a;};
private:
    int base_a;
    void base_fun1() { base_fun3(); base_fun2();++base_c; ++base_b; ++base_a;};
}; 

class Child: protected Base
{
public:
    int child_c;
    void child_fun3() {base_fun3(); base_fun2(); /*base_fun1();*/++base_c; ++base_b;/* ++base_a;*/};
protected:
    int child_b;
    void child_fun2() {base_fun3(); base_fun2(); /*base_fun1();*/++base_c; ++base_b;/* ++base_a;*/};
private:
    int child_a;
    void child_fun1() {base_fun3(); base_fun2(); /*base_fun1();*/++base_c; ++base_b;/* ++base_a;*/};
};

int mian()
{
    Base b1;
    cout << b1.base_c << endl;
    b1.base_fun3();
    // cout << b1.base_b << endl;
    //b1.base_fun2();
    //cout << b1.base_a << endl;
    //b1.base_fun1();
    Child c1;
    //cout << c1.base_c << endl;
    //c1.base_fun3();
    //cout << c1.base_b << endl;
    //c1.base_fun2();
    //cout << c1.base_a << endl;
    //c1.base_fun1();
    return 0;
}

/*************************************************************************
    > File Name: public.cpp
    > Author: 
    > Mail: 
    > Created Time: Sat 16 Apr 2016 11:19:10 PM EDT
 ************************************************************************/

#include<iostream>
using namespace std;


class Base
{
public:
    int base_c;
    void base_fun3() {/*base_fun2(); base_fun1();*/ ++base_c; ++base_b; ++base_a;};

protected:
    int base_b;
    void base_fun2() {/*base_fun1(); base_fun3();*/++base_c; ++base_b; ++base_a;};
private:
    int base_a;
    void base_fun1() {/* base_fun3(); base_fun2();*/++base_c; ++base_b; ++base_a;};
}; 

class Child: public Base
{
public:
    int child_c;
    void child_fun3() {base_fun3(); base_fun2(); /*base_fun1();*/++base_c; ++base_b;/* ++base_a;*/};
protected:
    int child_b;
    void child_fun2() {base_fun3(); base_fun2(); /*base_fun1();*/++base_c; ++base_b;/* ++base_a;*/};
private:
    int child_a;
    void child_fun1() {base_fun3(); base_fun2(); /*base_fun1();*/++base_c; ++base_b;/* ++base_a;*/};
};

int mian()
{
    Base b1;
    cout << b1.base_c << endl;
    b1.base_fun3();
    //cout << b1.base_b << endl;
    //b1.base_fun2();
    //cout << b1.base_a << endl;
    //b1.base_fun1();
    Child c1;
    cout << c1.base_c << endl;
    c1.base_fun3();
    //cout << c1.base_b << endl;
    //c1.base_fun2();
    //cout << c1.base_a << endl;
    //c1.base_fun1();
    return 0;
}