Re: [boost] Low-level precision timer proposal

From: Andy Little (andy_at_[hidden])
Date: 2006-05-16 05:33:28

"Gerhard Wesp" wrote

> Physics gives quite clear directions as to which operations a time type
> must support:
> - Addidtion, subtraction, comparison with other time's.
> - Division by other time's to give a dimensionless type.
> - Conversion to/from whatever is useful, maybe stream operators.
>
> Note that any builtin arithmetic types support those operations, but
> they're not "typesafe" in the sense that you might end up e.g. adding
> time and length.  A user-defined type can protect you from those
> accidents by only defining the above mentioned operations.
>
> *If* we want a user-defined type to represent time, it may well be part
> of a general framework for physical quantities.  See e.g.
> http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1451.html,
> section 6 for ideas on how this can be done.

BTW It might be useful to point out that my Physical Quantities library 'pqs' ,
which provides the above operations, is up for Formal Review by Boost at some
time in the near future:

http://tinyurl.com/7m5l8

(I hope that 'pqs_3_1_0' in that directory will be the review  version, but that
will be subject to my Review Managers approval. If all is in order then I hope
that the review dates for pqs will be confirmed soon).

regards
Andy Little