Design Pattern Factory

Factory.cpp

#include <iostream>

class Computer
{
public:
    virtual ~Computer() {}
    virtual void run() = 0;
    virtual void stop() = 0;
};

class Laptop : public Computer
{
public:
    virtual ~Laptop() {}
    virtual void run() override
    {
        hibernating_ = false;
        std::cout << "ハイバーネート解除します(*´Д｀)" << std::endl;
    }
    virtual void stop() override
    {
        hibernating_ = true;
        std::cout << "ハイバーネートします(´・ω・`)" << std::endl;
    }
private:
    bool hibernating_;   // ハイバーネート中かどうか
};

class Desktop : public Computer
{
public:
    virtual ~Desktop() {}
    virtual void run() override
    {
        on_ = true;
        std::cout << "起動しますた(*´ω｀*)" << std::endl;
    }
    virtual void stop() override
    {
        on_ = false;
        std::cout << "電源切ります(;´Д｀)" << std::endl;
    }
private:
    bool on_;            // 起動中かどうか
};

class ComputerFactory
{
public:
    enum ComputerType {
        LaptopType,
        DesktopType
    };
    static Computer* create(ComputerType description)
    {
        switch (description)
        {
        case LaptopType:
            return new Laptop();
        case DesktopType:
            return new Desktop();
        default:
            return nullptr;
        }
    }
};

int main()
{
    Computer *laptop = ComputerFactory::create(ComputerFactory::LaptopType); 
    laptop->run();
    laptop->stop();
    Computer *desktop = ComputerFactory::create(ComputerFactory::DesktopType); 
    desktop->run();
    desktop->stop();
    return 0;
}