>   b6- operations over set of different dimensions (e.g. result of length /
>       time should be speed type),
> [...]
>   c2- Dimnum library: similar to SIunits in functionality: doesn't provide
>       b6-9.

b6 is handled by dimnum:

   class si::velocity<float>  v;
   class si::length<float>    l;
   class si::time<float>      t;
   v = l/t;    // accepted
   v = l/t/t;  // flagged as error

Or do you mean something else with b6?

Kasper

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