[Boost-users] [units] Creating a velocity unit

Subject: [Boost-users] [units] Creating a velocity unit
From: Ryan (boost_at_[hidden])
Date: 2013-02-20 21:32:36

Boost Community,

I'm trying to create a custom velocity unit.  I would like to create a unit
that is in nautical miles per hour to represent my speed value.  If I use
pound_force.hpp as an example of units with more than one dimension I can
create the following.

BOOST_UNITS_DEFINE_BASE_UNIT_WITH_CONVERSIONS(metric,
nautical_mile_per_hour, "nautical mile per hour", "nmi h^-1", factor,
si::velocity, ???);

If this is the right track, what id would I use and how do I know that it
is unique?

This seems forced.  I would rather define this unit in terms of meters per
second.  Nautical miles is already in terms of meters and hours is also
defined as a scale of seconds.  Can I somehow use these two already defined
units to create the new unit?  How would I do this?

Ryan