In D10585#269547, @Hans Goudey (HooglyBoogly) wrote:

I think the conversion to C++ should happen in a different commit / patch. Do you have commit rights @Charlie Jolly (charlie)?

I do but not used for a while!

For some reason I cannot apply the patch easily.

I haven't tested it right now, but I think you can simplify the code significantly by using this:

static void sh_node_mix_rgb_expand_in_mf_network(blender::nodes::NodeMFNetworkBuilder &builder)
{
  bNode &node = builder.bnode();
  bool clamp = node.custom2 & SHD_MIXRGB_CLAMP;
  int mix_type = node.custom1;
  builder.construct_and_set_matching_fn<MixRGBFunction>(clamp, mix_type);
}

See D11506 for patch for c++ conversion. I'll update this patch once that is accepted.