Re: [boost] Boost.Units problem with user-defined units and dimensionless quantities

Subject: Re: [boost] Boost.Units problem with user-defined units and dimensionless quantities
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2011-09-23 11:05:47

AMDG

On 09/21/2011 12:29 PM, Pieter wrote:
> I am having some trouble using user-defined units and dimensionless once.
> Consider the example (taken straight from the documentation) that defines
> nautical miles (added at the bottom).
> 
> When I do the following on VS2010:
> 
> typedef quantity<boost::units::nautical::length> TDistanceInNMI;
> typedef quantity<dimensionless> TDimLess;
> 
> TDistanceInNMI nm1,nm2,nm3;
> TDimLess d;
> 
> nm1 = nm2 + nm3; // compiles OK
> nm1 = d*nm2; // compiles OK
> nm1 = nm2 + d*nm3; // does not compile, claims there is no operator+ defined
> 
> I suppose I might have to add a dimensionless type to the 'nautical' system,
> or have some misconceptions on how this should work. I tried adding the
> following line (mimicking some of the internal stuff) but that did not due
> to trick: 
> 
> typedef unit<dimensionless_type,system> dimensionless;
> 

I'm surprised that this doesn't work.  It seems
to work when I try it.  The attached compiles with
MSVC 2010.

> Could anyone tell me whether there is there anything I need to define to
> make this work? 
> 

In Christ,
Steven Watanabe