Re: [Boost-users] [units] how to use scaled_base_unit?

Subject: Re: [Boost-users] [units] how to use scaled_base_unit?
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2013-04-24 10:47:33

AMDG

On 04/24/2013 07:08 AM, Olaf Peter wrote:
>
> maybe I misuse it? Expect the compile errors I get
> 
> $ ./units
> 1000000000 q
> 0 m
> 

- Don't use integer conversion factors.  The library
  assumes that it can use constructs like x * (1/factor).
  You don't gain any precision by using int.  Anything
  that can be represented in an int32_t can be represented
  exactly in a double.
- You need to use bu::make_system/bu::unit for millimeter_base_unit,
  just like for meter_base_unit.
- You can define multiple conversion factors.  Just add
  BOOST_UNITS_DEFINE_CONVERSION_FACTOR(
    clients::units::my::length_base_unit,
    boost::units::si::meter_base_unit,
    double, 1000000000);
  to enable conversion to and from the Boost.Units systems.

In Christ,
Steven Watanabe