C++ 多态案列-电脑组装

# include<iostream>
# include<string>

using namespace std;

//抽象的CPU
class CPU
{
public:
	virtual void caculate() = 0;
};
//抽象的显卡
class GraphicsCard
{
public:
	virtual void show() = 0;
};

//抽象的内存条
class RAM
{
public:
	virtual void storage() = 0;
};

//电脑类
class Compute
{
public:
	Compute(CPU* cpu, GraphicsCard* gc, RAM* ram)
	{
		m_cpu = cpu;
		m_gc = gc;
		m_ram = ram;
	}

	void work()
	{
		m_cpu->caculate();
		m_gc->show();
		m_ram->storage();
	}
	~Compute()
	{
		if (m_cpu != NULL)
		{
			delete m_cpu;
			m_cpu = NULL;
		}

		if (m_gc != NULL)
		{
			delete m_gc;
			m_gc = NULL;
		}

		if (m_ram != NULL)
		{
			delete m_ram;
			m_ram = NULL;