AMDG On 04/23/2013 11:55 AM, Olaf Peter wrote:
at this time I start to understand boost.units. Following the doc http://www.boost.org/doc/libs/1_53_0/doc/html/boost_units/Units.html#boost_u... scaled_units are useful. But I didn't found use cases in the test or examples. E.g. https://svn.boost.org/svn/boost/trunk/libs/units/test/test_output.cpp show how to typedef this, but no usage.
scaled_base_unit works exactly like any other base unit. For instance, boost::units::si::kilogram_base_unit is a scaled_base_unit.
I try to map metric/si and imperial/us length to an intrinsic length using integer scale factors to avoid double representation uncertainly. Using BOOST_UNITS_DEFINE_CONVERSION_FACTOR I can convert meter and inch to the intrinsic length. But what about mm/um and thou/mil etc? For this I did consider scaled_base_unit. I like to convert between all of them. Since the dimensions are constant, no runtime conversation are required (as the dollar/euro example it shows). Later area calculations based on the intrinsic length are required, convertible also to metric/si and imperial systems.
In Christ, Steven Watanabe