工厂模式

工厂模式

定义一个用于创建对象的接口，让子类决定实例化哪一个类，Factory Method使得一个类的实例化延迟（目的：解耦，手段：虚函数）到子类。

class SplitterFactory
{
public:
  SplitterFactory(){ }
  virtual ~SplitterFactory(){ }
  
  virtual Splitter* createSplitter() = 0;
}

class Splitter
{
public:
  Splitter(){ }
  virtual ~Splitter(){ }
  
  virtual void split() = 0;
}

class TextSplitterFactory : public SplitterFactory
{
public:
  virtual Splitter* createSplitter() overrive
  {
    Splitter* splitter=new TextSplitter();
    //...
    return splitter;
  }
}

class TextSplitter : public Splitter
{
  virtual void split() overrive
  {
    //...
	}
}

class MainForm
{
public:
  MainForm(SplitterFactory* factory):factory_(factory){}
  ~MainForm(){}
  
  void buttonClick()
  {
    Splitter* splitter = factory->createSplitter();
    splitter->split();
  }
  
private:
  SplitterFactory* factory_;
}

UML类图