struct inheritance need?

Weed resume755 at mail.ru
Tue Dec 16 05:58:13 PST 2008


Weed пишет:
> 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


I think could help a static creation objects of classes (including 
compile-time creation), but it is also impossible now.
For example:

MatrixClass a(3,2);
static MatrixClass a(3,2);

Planned in the future to implement inheritance of structs or the static 
creation of classes?


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