From: Matt Austern (austern_at_[hidden])
Date: 2005-02-01 18:51:41
There's actually something even lower level than a dimension library.
In essence, what we've got is:
- We're generalizing the notion of an arithmetic type T to a type of
the form <T,X>, where X is some sort of tag.
- For any X1 and X2 and any arithmetic operation 'op', we have rules
for whether <T,X1> op <T,X2> is well defined. If it is then the
result is tagged as <T,X3>, and we have rules to determine X3 in terms
of X1, X2, and op.
All of the knowledge about how to represent dimensional systems (mpl
vectors, compile-time fractions, etc.) is higher level than this.
--Matt