Engineering types hierarchy

[dkristol@see-my.sig (David Kristola)]

Hello,

I am trying to put together a robust and easily usable
hierarchy of types packages to support a collection of
engineering units (kilograms, meters, seconds, etc.)
in scalar, vector, and matrix forms.

So far, i have a list of the base types and combined
types (meters per second and so on) that are going to
be used on this project.

There is an explosion of operators that i have to
implement.  "/" for meters and second returning
meters per seconds, and on, and on, and on.
Of course, there is nothing special about these
operators beyond the typing they do.

With a few "use type" statements, coding up algorithms
has been a breeze, and unit problems show up when i
try to compile (kg*m^2 being the same as N*m*s^2 was
only a minor nuisance).

So far, the plan is to set up the hierarchy of child
packages as such:

Numeric_Types
Numeric_Types.Vectors
Numeric_Types.Matrices
Numeric_Types.Quaternions
Numeric_Types.Double
Numeric_Types.Double.Vectors
Numeric_Types.Double.Matrices
Numeric_Types.Double.Quaternions

Is there a better way?

(No, this is not a class project)

Thanks,
--djk, keeper of arcane lore & trivial fluff
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