struct inheritance need?

[Bill Baxter]

2008/12/16 Weed <resume755 at mail.ru>:
> I should explain why it's important for me:
>
> For example, I am making a matrix object(s)
>
> It should be:
> - any size
> - with ability of making matrix instance of a given size in compile time.
> - ability of creating matrix instance in runtime.
>
> I have decided to make it struct because I need to create matrix
> object in compile time. in real program I'll need matricies of
> variable size and 3х1, 3х3, 6х6, 3х6 sizes (and may be other).
>
> I want to make matrix template and insert in it with mixin operator
> several structures of different sizes (and this structs are not store his
> dimensions in each instance, of course: variables width and height declared
> as invariant). By doing this I'll get several different structures
>  (matrix_dynamic, matrix3x3, matrix6x6 etc)
>
> question is how those matricies can interoperate? They does not have
> common parent (structures does not have inheritance) , so I can't
> make common function for matricies of different sizes opAdd for
> example, and have to do functions for all types of matricies.
>
> How should I implement such a class In D properly?
> It possible in C++, but I like some of the language D
>

Here's one way:
http://www.dsource.org/projects/openmeshd/browser/trunk/LinAlg/linalg/MatrixT.d

--bb