#include <iostream>using namespace std;class Base{public:    virtual void foo(void) { std::cout << "Base::foo()" << std::endl; }    virtual void doo(void) { std::cout << "Base::doo()" << std::endl; }};class Derived: public Base{public:    void foo(void)    {        //foo();        // 錯(cuò)誤。遞歸調(diào)用自己，即 Derived::foo()        Base::foo();    // 明確告訴編譯器，調(diào)用的是 Base::foo(), 而不是自己        std::cout << "Derived::foo()" << std::endl;    }    virtual void doo(void)    {        Base::doo();        std::cout << "Derived::doo()" << std::endl;    }};class Derived2 : public Derived{    virtual void doo(void)    {        Derived::doo();        std::cout << "Derived2::doo()" << std::endl;    }};class Derived3 : public Derived2{    virtual void foo(void)    {        Derived2::foo();        std::cout << "Derived3::foo()" << std::endl;    }};int main(/* int argc, char *argv[] */){    Derived3 *d = new Derived3;    Base *b = d;    b->foo();    cout << "------------------------" << endl;    b->doo();    b = nullptr;    delete d;    d = nullptr;    return 0;}
程序輸出：
結(jié)論：
1.派生類虛函數(shù)調(diào)用基類版本時(shí)，必須顯式使用作用域操作符。2.多態(tài)時(shí)，在虛函數(shù)繼承鏈上，如果某個(gè)子類沒(méi)有覆蓋虛函數(shù)，則調(diào)用親緣最近的父類版本。最佳做法，還是每個(gè)子類都實(shí)現(xiàn)。
參考資料：
1.派生類虛函數(shù)調(diào)用基類版本
http://blog.csdn.net/glx2012/article/details/8254623