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C++ 通过指针实现多态实例详解

C&C++ 发布时间：2022-04-03 发布网站：大佬教程 code.js-code.com

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C++ 通过指针实现多态实例详解

1.父类（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.子类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.子类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(); 
}