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 1 #include <iostream>
 2 #include<typeinfo>
 3 #include<vector>
 4 
 5 using namespace std;
 6 
 7 class Base{
 8 public:
 9     virtual void fun(){cout << "Base::fun
";}
10 };
11 class Derived : public Base{
12 public:
13     void fun(int i){cout << "Derived the i = " << i << endl;}
14 };
15 class Sunzi : public Derived{
16 public:
17     void fun(){cout << "in Sunzi
";}
18 };
19 
20 int main()
21 {
22     Derived de;
23     de.fun(1);
24     //de.fun(); //error
25     Sunzi sun;
26     sun.fun();
27     Base *ba = &sun;
28     ba->fun();
29     return 0;
30 }

 1 #include <iostream>
 2 #include<typeinfo>
 3 #include<vector>
 4 
 5 using namespace std;
 6 
 7 class Base{
 8 public:
 9     virtual void fun(){cout << "Base::fun
";}
10 };
11 class Derived : public Base{
12 public:
13     void fun(){cout << "in Derived
";}
14     void fun(int i){cout << "Derived the i = " << i << endl;}
15 };
16 class Sunzi : public Derived{
17 public:
18     void fun(){cout << "in Sunzi
";}
19     void fun(int i){cout << "Sunzi the i = " << i << endl;}
20 };
21 
22 int main()
23 {
24     Derived *de = new Derived();
25     Derived de2;
26     Base *ba;
27     Sunzi sun;
28 //
29     de->fun(1);
30     de->fun(); //error
31 
32     ba = &de2;
33     ba->fun();
34 
35     sun.fun();
36 
37     ba = &sun;
38     ba->fun();
39 
40     de = &sun;
41     de->fun();
42     de->fun(1);
43     return 0;
44 }

#include <iostream>
#include<typeinfo>
#include<vector>

using namespace std;

class Base{
public:
    virtual void fun(){cout << "Base::fun
";}
};
class Derived : public Base{
public:
    using Base::fun;    //using solve redefine
    void fun(int i){cout << "Derived the i = " << i << endl;}
};
class Sunzi : public Derived{
public:
    void fun(){cout << "in Sunzi
";}
};

int main()
{
    Derived de;
    de.fun(1);
    de.fun(); //ok
    Sunzi sun;
    sun.fun();
    Base *ba = &sun;
    ba->fun();
    return 0;
}

#include <iostream>
#include<typeinfo>
#include<vector>

using namespace std;

class Base{
public:
    virtual void fun(){cout << "Base::fun
";}
    virtual void fun(int i){cout << "Base:: i = " << i << endl;}
};
class Derived : public Base{
public:
    void fun(){cout << "in Derived
";}
    void fun(int i){cout << "Derived the i = " << i << endl;}
};

int main()
{
    Base *ba;
    Derived de;
    de.fun(1);
    de.fun(); //ok

    ba = &de;
    ba->fun();
    ba->fun(1);

    return 0;
}

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原文地址：https://www.cnblogs.com/CreatorKou/p/9056124.html