AMDG László Marák wrote:

I am getting started with boost.python. I want to port an image processing library into python. My problem is, that I have several pixel types (like int, float, etc.) which I'd love to handle in the same object by downcasting. In c++ it's something like this:

class image {};

class float_image : image { float * pixels; // or boost::array_ptr<float> }

class int_image : image { int * pixels; // or boost::array_ptr<int> }

I can create the image object by:

image * A = new float_image() image * B = new int_image()

Now I'd have a virtual functions

virtual float image::get_element() virtual int image::get_element()

obviously this won't pass in c++, but in python it should pose no difficulty, as python uses dynamic casting. Is there a manner to do this with c++/boost/python?

thank you for considering,

Because python is dynamically typed, you don't necessarily need to use inheritance. You can just have both classes provide a function called get_elements. In Christ, Steven Watanabe