Re: [Boost-users] [Units] Variant based runtime analysis

Subject: Re: [Boost-users] [Units] Variant based runtime analysis
From: gast128 (gast128_at_[hidden])
Date: 2011-03-01 10:52:09

Samuel Debionne <debionne <at> hydrowide.com> writes:

> Runtime conversion are also something I am interrested. Are you 
> following the lead of :
> 
http://www.boost.org/doc/libs/1_46_0/doc/html/boost_units/Examples.html#boost_u
nits.Examples.RuntimeUnits
> 
> I think that we could layer things this way :
> 
> LAYER 3: any_quantity<heterogeneous_units>
> runtime dimensional analysis and conversion
> 
> LAYER 2: any_quantity<homogeneous_dimension_units>
> compile time dimensional analysis and runtime conversion
> 
> LAYER 1: quantity<unit>
> the actual library
> 

Fwiw: this runtime variant would be really welcome. In our application we 
calculate some data with various units (e.g. m/s, m) which gets plotted. The 
plotter just talks to the base class of the data, like:

struct Data
{
   Unit    GetUnit () const;
   double  GetValue(size_t nIndex) const;
};

Also the user is able to specify his display units (e.g. cm instead of m), and 
we use the runtime unit for scaling the physical quantities.

(snipped some quoted stuff, gmane reports: 'There's much more quoted text in 
your article than new. Prune quoted stuff.')