设计模式系列（3）依赖倒转原则实例

实例代码：

业务层用计算机代替，计算机使用硬盘、CPU、内存，但不依赖于具体厂家，设计Comouter框架和具体的厂家进行

解耦合。

#include <iostream>


using namespace std;


class HardDisk
{
public:
  virtual void work() = 0;
};


class Memory
{
public:
  virtual void work() = 0;
};


class Cpu
{
public:
  virtual void work() = 0;
};


//Computer框架和具体的厂商进行解耦合
class Computer
{
  public:
    Computer(HardDisk *harddisk, Memory *memory, Cpu *cpu)
    {
      m_harddisk = harddisk;
      m_memory = memory;
      m_cpu = cpu;
    }
    void work()
    {
      m_harddisk->work();
      m_memory->work();
      m_cpu->work();
    }
  private:
    HardDisk *m_harddisk;
    Memory *m_memory;
    Cpu *m_cpu;
};


class InterCpu : public Cpu
{
  public:
    void work()
    {
      cout << "InterCpu ..." << endl;
    }
};


class XSDisk : publicHardDisk
{
  public:
    void work()
    {
      cout << "XSDisk ..." << endl;
    }
};


class JSDMem : public Memory
{
  public:
    void work()
    {
      cout << "JSDMem ..." << endl;
    }
};


int main()
{
  HardDisk *harddisk = NULL;
  Memory *memory = NULL;
  Cpu *cpu = NULL;


  memory = new JSDMem;
  harddisk = new XSDisk;
  cpu = new InterCpu;


  Computer *mycomputer = new Computer(harddisk, memory, cpu);
  mycomputer->work();
  delete mycomputer;
  delete cpu;
  delete mycomputer;
  delete memory;


  return 0;
}