Re: [Boost-users] boost::units - converting from one derived_dimension to another across systems (imperial to metric)

On Thu, Nov 15, 2018 at 10:29 AM Damien Hocking via Boost-users wrote:

...

On Nov 15, 2018, at 8:18 AM, Steven Watanabe via Boost-users wrote:

AMDG

...

On 11/14/2018 05:04 AM, Matt Vinson via Boost-users wrote: I am having trouble converting from one derived_dimension to another across systems (imperial to metric). I'd like to convert, say, lb/in to, say, kg/m. I thought I would do the following but get a compiler error #:

It's not going to work. lb is a unit of force, but kg is a unit of mass. They are not compatible and there is no conversion between them.

...

*.h-------------------------------------------------------------------------------- namespace dimensional_analysis { namespace lineal_force { //lb/in typedef boost::units::derived_dimension< boost::units::us::pound_force_base_unit, 1, boost::units::us::inch_base_unit, -1 >::type lb_per_inch_dimension;

units are not dimensions. You can't use derived_dimension with base_units.

...

<snip>

In Christ, Steven Watanabe _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org https://lists.boost.org/mailman/listinfo.cgi/boost-users

There is technically a kilogram force unit, kg-f or kilopond. I don’t know if that’s in Units though.

That, or, if memory serves, you need to factor out gravitational, or whatever other force, is being masked by the lb. Cheers...

Damien _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org https://lists.boost.org/mailman/listinfo.cgi/boost-users