proxy_pattern_implementation.cpp

class ImagePtr {
  public:
      ImagePtr(const char* imageFile);
      virtual ~ImagePtr();

      virtual Image* operator->();
      virtual Image& operator*();
  private:
      Image* Loadlmage();
  private:
      Image* _image;
      const char* _imageFile;
};

ImagePtr::ImagePtr (const char* thelmageFile) {
    _imageFile = thelmageFile;
    _image = 0;
}

Image* ImagePtr::Loadlmage () {
    if (_image ==0) {
        _image = LoadAnlmageFile(_imageFile);
    }
    return _image;
}

//===== Look at here =========
Image* ImagePtr::operator-> () {
    return Loadlmage();
}

Image& ImagePtr::operator* () {
    return *LoadImage();
}
// =============================


ImagePtr image = ImagePtr("anlmageFileName");
image->Draw(Point(50, 100));

// (image.operator->())->Draw(Point(50, 100))