C++ 通過指針實現多態實例詳解

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 C++ 通過指針實現多態實例詳解

1.父類（DBConnector）

1）DBConnector.h

#include <string> 
using namespace std; 
class DBConnector 
{ 
private: 
 string name; 
public: 
 DBConnector(); 
 DBConnector(string _name); 
 ~DBConnector(); 
 
 void show(); 
}; 

2）DBConnector.cpp

#include "DBConnector.h" 
#include <iostream> 
using namespace std; 
 
DBConnector::DBConnector() 
{ 
} 
 
DBConnector::DBConnector(string _name) 
{ 
 name = _name; 
} 
 
DBConnector::~DBConnector() 
{ 
} 
 
void DBConnector::show() 
{ 
 cout << name << endl; 
} 

2.子類1（MySqlConnector）

1）MSSqlConnector.h

#pragma once 
#include "DBConnector.h" 
class MSSqlConnector :public DBConnector 
{ 
public: 
 MSSqlConnector(); 
 MSSqlConnector(string _name); 
 ~MSSqlConnector(); 
}; 

2）MSSqlConnector.cpp

#include "MSSqlConnector.h" 
 
MSSqlConnector::MSSqlConnector() 
{ 
} 
 
MSSqlConnector::MSSqlConnector(string _name) :DBConnector(_name) 
{ 
  
} 
 
MSSqlConnector::~MSSqlConnector() 
{ 
} 

3.子類2（MSSqlConnector）

1）MSSqlConnector.h

#pragma once 
#include "DBConnector.h" 
class MSSqlConnector :public DBConnector 
{ 
public: 
 MSSqlConnector(); 
 MSSqlConnector(string _name); 
 ~MSSqlConnector(); 
}; 

2）MSSqlConnector.pp

#include "MSSqlConnector.h" 
 
MSSqlConnector::MSSqlConnector() 
{ 
} 
 
MSSqlConnector::MSSqlConnector(string _name) :DBConnector(_name) 
{ 
  
} 
 
MSSqlConnector::~MSSqlConnector() 
{ 
} 

4.Test

#include "MySqlConnector.h" 
#include "MSSqlConnector.h" 
#include <iostream> 
#include <string> 
using namespace std; 
 
void main() 
{ 
 MySqlConnector mysql("mysql"); 
 MSSqlConnector mssql("mssql"); 
 
 DBConnector* p; 
 p = &mysql; 
 p->show(); 
 
 p = &mssql; 
 p->show(); 
  
 //mysql.show(); 
 //mssql.show(); 
} 

5.運行結果

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