Re: [問題] 關於virtual function

[ric2k1 (Ric)]

※ 引述《old000 (千)》之銘言：
: 假設 class B 是繼承 class A
: 那如果 A 裡面的 virtual function
: 在 B 裡面沒有被implement
: 這樣compile會過嗎？

像這樣...

#include <iostream>
using namespace std;

class Base {
 public:
   virtual void f() { cout << "Base::f()" << endl; }
   void g() { cout << "Base::g()" << endl; }
   virtual void h() { cout << "Base::h()" << endl; }
};

class Derived: public Base {
 public:
   void f() { cout << "Derived::f()" << endl; }
   void g() { cout << "Derived::g()" << endl; }
};

int
main()
{
   Base *p = new Derived;
   p->f();
   p->g();
   p->h();

   Base *q = new Base;
   q->f();
   q->g();
   q->h();

   Derived *r = new Derived;
   r->f();
   r->g();
   r->h();
}

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推 old000:天啊 謝謝老師！<(_._)>