[導入]派生類對基類成員的訪問權限

1.派生類對基類private成員沒有訪問權限。

2.派生類只能通過派生類對象訪問其基類的protected成員，派生類對其基類類型對象的protected成員沒有特殊訪問權限。

#include<iostream>
using namespace std;

class Base
{
public:
    Base():i(0),j(0){};
protected:
    int i;
private:
    int j;
};

class Derived:public Base
{
    Derived():Base(){};

    print(const Base &b, const Derived &d)
    {
        int num = i;
        //num = b.i; //error. cannot access protected member declared in class 'Base'
        num = d.i;
        //num = d.j; //error. cannot access private member declared in class 'Base'
    };
};

int main()
{
    return 0;
}
文章來源:http://liyuxia-life.spaces.live.com/Blog/cns!DA1B364675ACF35!262.entry

posted on 2009-03-22 19:26 幸運草 閱讀(785) 評論(0)  編輯 收藏 引用 所屬分類: C++