Re: [Boost-users] [units] Creating specific unit quantities

7 Mar 2011


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On Thu, Mar 3, 2011 at 4:58 PM, Matthias Schabel <boost@schabel-family.org> wrote:
Why don't you give a code snippet that does what you want to do?
using namespace boost::units;
class Test {
  public:
    void setX(quantity<si::length> const& x) {
      m_X = x;
    }
  private:
    quantity<si::length> m_X;
};
int main(int, char const *[]) {
typedef boost::units::us::foot_base::unit_type foot_unit;
static const foot_unit foot;
Test a;
quantity<si::length>                                   first (1.0 * si::meter);
quantity<foot_unit>                                    second(1.0 * foot);
quantity<boost::units::si::meter_base_unit::unit_type> third (1.0 * si::meter);
a.setX(first);
a.setX(second);
a.setX(third);
return 0;
}
#include <boost/units/quantity.hpp>
#include <boost/units/systems/si.hpp>
#include <boost/units/base_units/us/foot.hpp>

using namespace boost::units;
 
class Test {
  public:
    // takes any unit of length
    template<class System>
    void setX(quantity<unit<length_dimension,System> > const& x) {
      // explicit conversion to si::length = meters
      m_X = quantity<si::length>(x);
    }
  private:
    quantity<si::length> m_X;
};
 
int main(int, char const *[]) {
 
typedef boost::units::us::foot_base_unit::unit_type foot_unit;
static const foot_unit foot;
 
Test a;
 
quantity<si::length>                                   first (1.0 * si::meter);
quantity<foot_unit>                                    second(1.0 * foot);
quantity<boost::units::si::meter_base_unit::unit_type> third (1.0 * si::meter);
 
a.setX(first);
a.setX(second);
a.setX(third);
 
return 0;
}