From: "Adam Badura" <abadura@o2.pl>
For now I think taht template representation would be best. What i mean is for example
struct rgb_8888 { unsigned char r : 8; unsigned char g : 8; unsigned char b : 8; unsigned char : 8; };
struct yuv_422 { unsigned char y : 4; unsigned char u : 2; unsigned char v : 2; };
template<typename Components> class color { private: Components mComponents; };
I haven't been following your discussion but this looks suspect. First, you'd need to specialize color for each color structure type so the color member functions know how to do the right thing. That obviates what I think you're trying to do with the template. Second, all code using colors must be either templated on color type or will only work with one type. That is, including the representation in the type (color<yuv_422>) means that functions must be written in terms of color<something> and can't work with color<something_else_entirely>. To fix the former problem, you might consider that the color template can provide higher level functionality from primitives supplied by a policy type. Thus, your Components type would have to provide represention plus primitives. To fix the latter problem, you would need an ABC from which color<T> derives. HTH -- Rob Stewart stewart@sig.com Software Engineer http://www.sig.com Susquehanna International Group, LLP using std::disclaimer;