Re: [Boost-users] [Units] Converting from angular_velocity to degrees_per_second

Subject: Re: [Boost-users] [Units] Converting from angular_velocity to degrees_per_second
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2010-12-01 14:43:17

AMDG

On 12/1/2010 11:10 AM, Andrew Hundt wrote:
> I have made my question more specific so it will be easier to answer.
> I need to make a conversion from a general angular_velocity to
> degrees/second.

There's no such thing as a general angular_velocity.
I assume that you mean that you want to convert
from radians/second to degrees/second.

> To illustrate this problem the example boostUnits.cpp:
>
>      #include<boost/units/systems/si.hpp>
>      #include<boost/units/systems/angle/revolutions.hpp>
>      #include<boost/units/systems/angle/degrees.hpp>
>      #include<boost/units/conversion.hpp>
>      #include<boost/units/pow.hpp>
>      #include<iostream>
>      #include<iterator>
>      #include<algorithm>
>
>      int main()
>      {
>        boost::units::quantity<  boost::units::si::angular_velocity>
> m_speed((30.0*boost::units::si::radians_per_second));
>        std::cout<<  "m_speed: "<<  m_speed<<  std::endl;
>
>        uint32_t result =
> static_cast<uint32_t>(boost::units::quantity<boost::units::si::angular_velocity,uint32_t>(m_speed*boost::units::degree::degrees/boost::units::si::seconds).value());
>        std::cout<<  " result:"<<  result<<  std::endl;
>
>        return(0);
>      }

Try

typedef boost::units::divide_typeof_helper<
     boost::units::degree::plane_angle,
     boost::units::si::time
 >::type degrees_per_second;

static_cast<boost::units::quantity<degrees_per_second> >(m_speed);

In Christ,
Steven Watanabe