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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