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This article gives you an example of C++ inheritance analysis, the content is very detailed, interested friends can refer to, I hope to help you.

C++ supports a variety of programming styles, including support for object-oriented design. Today we will introduce in detail the specific application methods of various C++ inheritance methods, hoping to help you have an in-depth understanding of this knowledge.

C++ inheritance is divided into the following ways:

Public, private, protected (they directly affect the members of derived classes and the rules by which their objects access base class members).

(1) public (public inheritance): inheritance keeps the attributes of each member of the base class unchanged, and the private members of the base class are hidden. Members of a derived class can access only public/protected members of the base class, not private members; objects of a derived class can access only public members of the base class.

(2) private (private inheritance): when inheritance, all member attributes in the base class become private, and private members in the base class are hidden. Members of a derived class can only access public/protected members of the base class, not private members; objects of a derived class cannot access any members of the base class.

(3) protected (protected inheritance): when inheritance, all member attributes in the base class become protected, and private members in the base class are hidden. Members of a derived class can access only public/protected members of the base class, not private members; objects of a derived class cannot access any members of the base class.

C++ inheritance application code example:

#include

using namespace std;

class Base

{

public://公有的

int a1;

virtual void test() = 0;

protected://受保护的

int a2;

private://私有的

int a3;

};

class ProtectedClass:protected Base//保护继承

{

public:

void test()

{

a1 = 1;//a1在这里被转变为protected

a2 = 2;//a2在这里被转变为protected

//a3=3;//错误，派生类不能访问基类的私有成员

}

};

class ControlProtectedClass:public ProtectedClass

//以public方式继承ProtectedClass类

{

public:

void test()

{

a1 = 1;//a1在这里仍然保持为a1在这里被转变为protected

a2 = 2;//a2在这里仍然保持为a1在这里被转变为protected

//a3=3;//错误,由于Base类成员为私有的，即使是上级父类是保护继承，

也不能改变Base类成员的控制类型

}

};

class PrivateClass:private Base//私有继承

{

public:

void test()

{

a1 = 1;//a1在这里被转变为private

a2 = 2;//a2在这里被转变为private

//a3=3;//错误，基类私有成员对文件区域与派生类区域都是不可访问的

}

};

class ControlPrivateClass:public PrivateClass

//以public方式继承PrivateClass类

{

public:

void test()

{

//a1=1;//错误，由于基类PrivateClass为私有继承,a1已经转变为private

//a2=2;//错误，由于基类PrivateClass为私有继承,a1已经转变为private

//a3=3;//错误,由于Base类成员为私有的，PrivateClass类也为私有继承

}

};

class PublicClass:public Base

//共有继承有区别与其它方式的继承，继承后的各成员不会其改变控制方式

{

public:

void test()

{

a1 = 1;//a1仍然保持public

a2 = 2;//a2仍然保持protected

//a3=3;//错误，派生类不能操作基类的私有成员

}

};

class ControlPublicClass:public PublicClass//以public方式继承PublicClass类

{

public:

void test()

{

a1 = 1;//a1仍然保持public

a2 = 2;//a2仍然保持protected

//a3=3;//错误，由于Base类成员为私有成员，即使是上级父类是公有继承，

也不能改变Base类成员的控制类型

}

};

int main()

{

system("pause");

}

认真看完了C++继承方式的应用例子，相信细心的读者对于共有继承、保护继承与私有继承的区别与特点已经了解，***再提醒一下读者，在继承关系中，基类的private成员不但对应用程序隐藏，即使是派生类也是隐藏不可访问的，而基类的保护成员只对应用程序隐藏，对于派生类来说是不隐藏的,保护继承与私有继承在实际编程工作中使用是极其少见的，他们只在技术理论上有意义。

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