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();
}
5.运行结果
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