设计模式13：代理模式【结构型】

#include <iostream>
using namespace std;

//
struct IImage
{
public:
IImage(string name) : m_name(name) { }
virtual ~IImage() { }

virtual void Show() = 0;

protected:
string m_name;
};

class CBigImage : public IImage
{
public:
CBigImage(string name) : IImage(name) { }
virtual ~CBigImage() { }

virtual void Show() { cout<<m_name.c_str()<<endl; }
};

class CBigImageProxy : public IImage
{
public:
CBigImageProxy(string name) : IImage(name)
{
m_pBigImage = new CBigImage(m_name);
}
virtual ~CBigImageProxy()
{
if(m_pBigImage)
{
delete m_pBigImage;
m_pBigImage = NULL;
}
}

virtual void Show()
{
m_pBigImage->Show();
}

private:
CBigImage *m_pBigImage;
};

//
void main()
{
CBigImageProxy bigImageProxy("Big Image.");
bigImageProxy.Show();
}