C++下实现同接口下多个类作为参数的调用和传参

/*
         实现同接口下不同类的对象的转移 
        定义类的接口
        定义多个继承该接口的类
        定义管理类，把接口当作类型，
        传入该接口下各种类的对象，进行操作 
*/
#include<iostream>
#include<map>
#include<cstdlib>
using namespace std;
template<typename keyType,typename valueType>
struct Node{
    keyType key;
    valueType value;
    Node *next;
};
template<typename keyType,typename valueType>
class List
{
    public:
        List()
        {
            tail=accom=mallocmemory();//initialize head node    
        }
        void Add(keyType key,valueType value){
            Node<keyType,valueType> *nd=mallocmemory();
            nd->key=key;
            nd->value=value;
            tail->next=nd;
            tail=tail->next;
        }
        valueType Get(keyType key,bool del=false)
        {
            Node<keyType,valueType> *record,*temp=accom->next;
            valueType t;
            while(temp!=NULL&&temp->key!=key)
            {
                temp=temp->next;
            }
            t=temp->value;
            if(del)
            {
                record=accom;
                while(record->next!=temp)
                record=record->next;
                record=temp->next;
                free(temp);
            }
            return t;
        }
        bool Exist(keyType key)
        {
            Node<keyType,valueType> *temp=accom->next;
            while(temp!=NULL&&temp->key!=key)
            {
                temp=temp->next;
            }
            if(temp==NULL)
            return false;
            return true;
        }
        valueType RemoveById(keyType id)
        {
            return Get(id,true);
        } 
    private:
        Node<keyType ,valueType> *mallocmemory(){
            Node<keyType,valueType> *nd=(Node<keyType,valueType>*)malloc(sizeof(Node<keyType,valueType>));
            nd->next=NULL;
            return nd;
        }
        Node<keyType,valueType> *accom,*tail;
};
class IPerson{
    public:
        virtual void SetName(string name)=0;
        virtual void SetAge(int age)=0;
        virtual void ShowInfo()=0;
}; 
class Student:public IPerson
{
    public:
        void SetName(string name)
        {
            Name=name;
        }
        void SetAge(int age)
        {
            Age=age;
        }
        void ShowInfo()
        {
            cout<<"学生信息："<<endl;
            cout<<"\tName: "<<Name<<endl;
            cout<<"\tAge : "<<Age<<endl; 
        }
    private:
        string Name;
        int Age;
};
class Parent:public IPerson
{
    public:
        void SetName(string name)
        {
            Name=name;
        }
        void SetAge(int age)
        {
            Age=age;
        }
        void ShowInfo()
        {
            cout<<"家长信息："<<endl;
            cout<<"\tName: "<<Name<<endl;
            cout<<"\tAge : "<<Age<<endl; 
        }
    private:
        string Name;
        int Age;
};
class Teacher:public IPerson
{
    public:
        void SetName(string name)
        {
            Name=name;
        }
        void SetAge(int age)
        {
            Age=age;
        }
        void ShowInfo()
        {
            cout<<"老师信息："<<endl;
            cout<<"\tName: "<<Name<<endl;
            cout<<"\tAge : "<<Age<<endl; 
        }
    private:
        string Name;
        int Age;
};
class Manager{
    public:
        Manager()
        {
            curPer=NULL;
        }
        void SetName(string name)
        {
            curPer->SetName(name);
        }
        void SetAge(int age)
        {
            if(curPer==NULL)cout<<"农夫"<<endl;
            else 
            curPer->SetAge(age);
        }
        void ShowInfo()
        {
            curPer->ShowInfo();
        }
        void AddPeople(int id,IPerson *person)
        {
            per.Add(id,person);
        }
        void ChangeState(int id)
        { 
            if(per.Exist(id))
            curPer=per.Get(id); 
            else
            cout<<"没有找到这个栈"<<endl;
        } 
    private:
        List<int,IPerson*> per;
        IPerson *curPer;
}; 
int main()
{
    Parent one;
    Student stu;
    Teacher tea;
    Manager manage;
    manage.AddPeople(1,&one);
    manage.AddPeople(2,&stu);
    manage.AddPeople(3,&tea);
    
    manage.ChangeState(1);
    manage.SetAge(19);
    manage.SetName("jiazhang");
    
    manage.ChangeState(2);
    manage.SetAge(22);
    manage.SetName("xuesheng");
    
    manage.ChangeState(3);
    manage.SetAge(21);
    manage.SetName("laoshi");
    for(int i=3;i>0;i--) {
    manage.ChangeState(i);
    manage.ShowInfo();}
    
    return 0;
}