"Ross MacGregor" <ross__macgregor@[...].com>  wrote in message
news:bn89jt$1ta$1@[...]..
>  For example if you want your basic unit of length to be 299,792,458
>  meters and you wanted your calculations to use floats. You may want to
>  specify it like this:
> 
>  si_unit<float, 2.99792458e+8, meter_t> light_meters;

Slight problem on the Float here !
How does it work with (say) force?

>  si_unit<long double, 1.0, meter_t> meters;
> 
>  light_meters x_lm = 2500;

Assume this means  2500 light_meters rather than 2500 meters .?

>  light_meters y_lm = 10;
>  light_meters z_lm = x_lm + y_lm;
> 
>  meters m = lm; // warning possible loss of precision
> 
>  We are essentially creating a custom floating point value, but only
>  incurring the overhead during unit conversion.

Critical issue is whether the internal value of light_meters is 1  or
2.9979245e8 ?
(I would argue on 1)
But basically Yup! :-)

regards
Andy little



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