C++多重继承示例-优快云博客

本文通过一个具体的C++程序示例介绍了多重继承的概念及使用方法。示例中包括了基类BaseClass与两个一级派生类Derived1Level1、Derived2Level1，以及二级派生类Derived2Level2。通过成员函数的覆盖与调用展示了多重继承的特点。

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// C++_test1.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include<iostream>
#include<string>
#include<cctype>
#include<fstream>

// using namespace std;

using std::cin;
using std::cout;
using std::endl;
using std::string;
using std::ifstream;

//基类
class BaseClass {
public:
	BaseClass() {}
	void f(char*s = "unknown") {
		cout << "Function f() in BaseClass called from " << s << endl;
		h();
	}
protected:
	void g(char*s = "unknown") {
		cout << "Function g() in BaseClass is called from " << s << endl;
	}
private:
	void h() {
		cout << "Function h() in BaseClass\n";
	}
};
//派生类
class Derived1Level1 :public virtual BaseClass {
public:
	void f(char*s = "unknown") {
		cout << "Function f() in Derived1Level1 is called from " << s << endl;
		g("Derived1Level1");
		h("Derived1Level1");
	}
	void h(char*s = "unknown") {
		cout << "Function h() in Derived1Level1 is called from " << s << endl;
	}
};
//派生类
class Derived2Level1 :public virtual BaseClass {
public:
	void f(char*s = "unknown") {
		cout << "Function f() in Derived2Level1 is called from " << s << endl;
		g("Derived2Level1");
	}
};

class Derived2Level2 :public Derived1Level1, public Derived2Level1 {
public:
	void f(char*s = "unknown") {
		cout << "Function f() in Derived2Level2 is called from " << s << endl;
		g("Derived2Level2");
		Derived1Level1::h("Derived2Level2");
		BaseClass::f("Derived2Level2");
	}
};


int main() {
	
	BaseClass bc;
	Derived1Level1 d1ll;
	Derived2Level1 d2ll;
	Derived2Level2 d22;
	bc.f("main(1)");
	d1ll.f("main(2)");
	d1ll.h("main(3)");
	d2ll.f("main(4)");
	d22.f("main(5)");
	d22.h();


	//暂停，供用户按下enter
	// system("pause");
	cin.ignore();

	return 0;
}