虚函数与纯虚函数的代码解读——2

#include <iostream>

#include <string>

#include <assert.h>

#include <cstring>

#include <unistd.h>

#include <sys/types.h>

#include <signal.h>

using namespace std;

class Base

{

public:

    Base() {cout << "Base con" << endl;}

    virtual ~Base()

    {

        cout << "Base destructor" << endl;

    }

    virtual void Hiberarchy() const = 0;

};

void Base::Hiberarchy() const//pure virtual also can have function body

{

    cout << "Base::Hiberarchy" << endl;

}

class Derived : public Base

{

public:

    Derived() {cout << "Derived con" << endl;}

    virtual void Hiberarchy() const

    {

        Base::Hiberarchy();

        cout << "Derived::Hiberarchy" << endl;

    }

//    virtual ~Derived()

    ~Derived()

    {

        cout << "Derived destructor" << endl;

    }

    virtual void foo(){cout << "Derived foo()" << endl;}

};

int main()

{

    Base *pb = new Derived();

    pb->Hiberarchy();

    pb->Base::Hiberarchy();

    delete pb;

    Derived derivedObj;

    derivedObj.foo();

    //cout <<  << endl;

    return 0;

}