1. 程式人生 > >23種設計模式之享元模式(結構型,7 Flyweight,c++實現)

23種設計模式之享元模式(結構型,7 Flyweight,c++實現)



程式碼實現:

#include<iostream>

#include<list>

#include<string>

#include<map>

usingnamespace std;

classPerson

{

public:

Person(string name, int age)

{

this->name = name;

this->age = age;

}

virtual void print() = 0;

protected:

stringname;

intage;

};

classTeacher : publicPerson

{

public:

Teacher(string

name, int age, string id) : Person(name, age)

{

this->id = id;

}

virtualvoid print()

{

cout << "name: " << name << ", age: " << age << ", id:" << id << endl;

}

private:

string id;

};

classFlyweightTeacherFactory

{

public:

FlyweightTeacherFactory()

{

_map.clear();

}

~FlyweightTeacherFactory()

{

while (!_map.empty())

{

map<string, Person*>::iterator it = _map.begin();

Person* p = it->second;

_map.erase(it);

delete p;

}

}

Person* getTeacher(string id)

{

string name;

int age;

Person* t = NULL;

map<string, Person*>::iterator it;

it = _map.find(id);

if (it == _map.end())

{

cout <<"Please input teacher name"<<

endl;

cin >> name;

cout <<"Please input teacher name"<< endl;

cin >> age;

t = new Teacher(name, age, id);

_map.insert(pair<string, Person*>(id, t));

}

else

{

t = it->second;

}

return t;

}

private:

map<string, Person*> _map;

};

void main()

{

FlyweightTeacherFactory* factory = newFlyweightTeacherFactory;

Person* person1 = factory->getTeacher("001");

person1->print();

Person* person2 = factory->getTeacher("001");

person2->print();

delete factory;

}