Re: [Boost-users] Using atan2 in boost::units

Subject: Re: [Boost-users] Using atan2 in boost::units
From: Brandon Olivares (programmer2188_at_[hidden])
Date: 2010-01-04 16:52:06

On 2010-01-04, Steven Watanabe wrote:
> AMDG
> 
> Matthias Schabel wrote:
>> I think we should probably have functions that return angles default
> to radians if not otherwise specified in the system. To my mind, that
> is consistent with the principle of least surprise and is consistent
> with existing library functionality... While the above solution should
> work and is consistent, it requires more understanding of Boost.Units
> than should be necessary for simple use of inverse trigonometric
> functions.
>> 
> 
> Yeah.  That makes sense.
> 

I ended up doing something like the following to get it to work. Please let
me know if there is a better way.

template<class Length>
template<class Angle>
physics::cylindrical_coordinate_system::point<Length, Angle>&
point<Length>::to_cylindrical() const
{
static physics::cylindrical_coordinate_system::point<Length, Angle>
cylindrical(
boost::units::sqrt(boost::units::pow<2>(x_) + boost::units::pow<2>(y_)),
static_cast<boost::units::quantity<Angle> >(
boost::units::atan2(
static_cast<boost::units::quantity<boost::units::si::dimensionless> >(
y_.value()),
static_cast<boost::units::quantity<boost::units::si::dimensionless> >(
x_.value()))),
z_
);
return cylindrical;
} // to_cylindrical

I didn't quite understand what you were getting at before. light_second is a
measure of length, so I didn't want to include a measure of angle in it.

Thanks,
Brandon

> In Christ,
> Steven Watanabe
> 
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