Structure's inheritance

[Temtaime]

Hello to all !
I'm surprised that there is no structure's inheritance.

There is a problem:
I want to make Matrix MxN class. I also want to make child 
classes Square Matrix and Vector from it with additional 
functions.
I don't want use "class" cause of "new" overhead. Std typecons's 
Scoped - workaround with many restrictions, so it isn't true 
solution.

I'm tried mixin template but there is no luck. I don't know how 
to declare multiplication operator for example.

Any suggestions ?
Regards.