C++多态

● 编译时的多态性
编译时的多态性是通过重载来实现的。对于非虚的成员来说，系统在编译时，根据传递的参数、返回的类型等信息决定实现何种操作。
● 运行时的多态性
运行时的多态性就是指直到系统运行时，才根据实际情况决定实现何种操作。C#中，运行时的多态性通过虚成员实现。

● 特点
编译时的多态性为我们提供了运行速度快的特点，而运行时的多态性则带来了高度灵活和抽象的特点。

#include"cstdio"
#include"cstdlib"
#include"algorithm"
#include"iostream"
#include"sstream"
#include"cstring"
#include"string"
#include"algorithm"
using namespace std;
class Father{
public:
    Father(){
        cout<<this<<":"<<"create Father object"<<endl;
    }
    virtual ~Father(){
        cout<<"out of class Father"<<endl;
    }
    void fun(){
        cout<<"this is a common fun"<<endl;
    }
    virtual void DoSomething(){
        cout<<"do something in class Fahter"<<endl;
    }
};
class Son:public Father{
public:
    Son(){
        cout<<this<<":"<<"create Son object"<<endl;
    }
    ~Son(){
        cout<<"out of the class Son"<<endl;
    }
    void DoSomething(){
        cout<<"do something in class Son"<<endl;
    }
};
int main()
{
    Son *f=new Son();
    f->DoSomething();
    f->fun();
    delete f;
}

运行结果：

0x9cca008:create Father object
0x9cca008:create Son object
do something in class Son
this is a common fun
out of the class Son
out of class Father