设计模式之Facade外观模式

//SubSystem（子系统角色）
//主板
class Motherboard
{
public:
	Motherboard()
	{
		std::cout << "Motherboard 构造函数" << std::endl;
	}
	~Motherboard()
	{
		std::cout << "~Motherboard 析构函数" << std::endl;
	}
	void poweronMotherboard()
	{
		std::cout << "------主板上电------" << std::endl;
	}

private:

};
//内存
class Memory
{
public:
	Memory()
	{
		std::cout << "Memory 构造函数" << std::endl;
	}
	~Memory()
	{
		std::cout << "~Memory 析构函数" << std::endl;
	}
	void selfCheckMemory()
	{
		std::cout << "------内存自检电------" << std::endl;
	}

private:

};
//CPU
class CPU
{
public:
	CPU()
	{
		std::cout << "CPU 构造函数" << std::endl;
	}
	~CPU()
	{
		std::cout << "~CPU 析构函数" << std::endl;
	}
	void runCPU()
	{
		std::cout << "------CPU运行------" << std::endl;
	}

private:

};

//HardDisk
class HardDisk
{
public:
	HardDisk() {
		std::cout << "HardDisk 构造函数" << std::endl;
	}
	~HardDisk() {
		std::cout << "~HardDisk 析构函数" << std::endl;
	}
	void readHardDisk() {
		std::cout << "------读取硬盘------" << std::endl;
	}
};

//OS
class OS
{
public:
	OS()
	{
		std::cout << "OS 构造函数" << std::endl;
	}
	~OS()
	{
		std::cout << "~OS 析构函数" << std::endl;
	}
	void loadOS()
	{
		std::cout << "------加载操作系统------" << std::endl;
	}

private:

};

//Facade（外观模式）
class PoweronButton
{
public:
	PoweronButton()
	{
		std::cout << "PoweronButton 构造函数" << std::endl;

		m_pMotherboard = new Motherboard;
		m_pMemory = new Memory;
		m_pCPU = new CPU;
		m_pHardDisk = new HardDisk;
		m_pOS = new OS;
	}
	~PoweronButton() 
	{
		std::cout << "~PoweronButton 析构函数函数" << std::endl;
		if (nullptr != m_pMotherboard)
		{
			delete m_pMotherboard;
			m_pMotherboard = nullptr;
		}

		if (nullptr != m_pMemory)
		{
			delete m_pMemory;
			m_pMemory = nullptr;
		}

		if (nullptr != m_pCPU)
		{
			delete m_pCPU;
			m_pCPU = nullptr;
		}

		if (nullptr != m_pHardDisk)
		{
			delete m_pHardDisk;
			m_pHardDisk = nullptr;
		}

		if (nullptr != m_pOS)
		{
			delete m_pOS;
			m_pOS = nullptr;
		}	
	}

	void pressButton()
	{
		std::cout << std::endl;

		std::cout << "点击电源按钮..." << std::endl;
		std::cout << "正在开机..." << std::endl;
		std::cout << "...." << std::endl;
		std::cout << ".." << std::endl;
		m_pMotherboard->poweronMotherboard();
		m_pMemory->selfCheckMemory();
		m_pCPU->runCPU();
		m_pHardDisk->readHardDisk();
		m_pOS->loadOS();
		printf("开机完成！n");
	
		std::cout << std::endl;
	}

private:
	Motherboard *m_pMotherboard;
	Memory *m_pMemory;
	CPU *m_pCPU;
	HardDisk *m_pHardDisk;
	OS *m_pOS;
};

#include 
#include  
using namespace std;

void main()
{
	auto *poweronButton = new PoweronButton();
	powerOnButton->pressButton();
	delete powerOnButton;
	system("pause");
}