C++ 通过指针实现多态实例详解
2019/7/10 22:49:28
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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(); }
5.运行结果
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