Re: [Boost-users] more Boost::Units questions

Subject: Re: [Boost-users] more Boost::Units questions
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-01-12 16:48:35

AMDG

Mark Volkmann wrote:
> On Jan 9, 2009, at 5:33 PM, Matthias Schabel wrote:
>
>>> My biggest issue is that my recent software development experience 
>>> has involved using Java much more than C++ and I'm trying to learn 
>>> how to use a C++ library that makes pretty heavy use of templates. 
>>> Is there a tutorial somewhere that shows examples of doing basic 
>>> things with this library? The kind of things
>>
>> The examples directory has simple, functional demonstrations of just 
>> about every type of functionality that anyone has wanted to date.
>
> Okay, I've looked at the code related to conversions. 
> conversion_factor.cpp sets up a bunch of double values that I assume 
> are used to convert values in one unit to values in another. However, 
> they aren't used in any code.

conversion_factor isn't used for conversions.  It just returns the value 
that
would be used for a conversion.

> I don't see any example that actually performs a conversion using 
> conversion_factor. Can you show me how to use that to convert miles to 
> kilometers? It looks like kilometers isn't defined in any of the .hpp 
> files. I can just multiply meters by 1000 myself, but if there's 
> something in the library that hides this detail, I'd like to know 
> about it.

http://www.boost.org/doc/html/boost_units/Examples.html#boost_units.Examples.ConversionExample
The example uses SI and CGS, but converting between any units is similar.

In Christ,
Steven Watanabe