c++ - Use boost to convert degrees minutes seconds radians boost_1_48_0 -

i have got code work:

typedef model::point<double, 2, cs::spherical_equatorial<degree> > degree_point;  degree_point flindersse(-37.0, 144.0); 

and this:

quantity<plane_angle> flinders = 0.375 * radians; //this works 0.375 radians 

but degrees minutes , seconds & convert radians again.

i have spent day trying understand how boost system works - examples bit thin on ground, wondering if show quick example?

thanks in advance 8+)

edit

//quantity<degree_base_unit> flinderssdeg2.value(-37.0); //quantity< angle::arcminute_base_unit> flinderssmin = 57.0; //quantity< angle::arcsecond_base_unit> flindersssec = 3.72030; 

i guess need better understanding of how declaration works. :)

edit2:

thanks - maybe spent whole looking ways boost & facility wasn't there ! thought might have been because found obsolete code here http://www.boost.org/doc/libs/1_47_0/libs/geometry/doc/doxy/doxygen_input/sourcecode/doxygen_1.cpp

void example_dms() { /* extension, other coordinate system: // construction degree/minute/seconds boost::geometry::dms<boost::geometry::east> d1(4, 53, 32.5);  // explicit conversion double. std::cout << d1.as_value() << std::endl;  // conversion string, optional strings std::cout << d1.get_dms(" deg ", " min ", " sec") << std::endl;  // combination latitude/longitude , cardinal directions {     using namespace boost::geometry;     point_ll<double, boost::geometry::cs::geographic<boost::geometry::degree> >        canberra(         latitude<>(dms<south>(35, 18, 27)),         longitude<>(dms<east>(149, 7, 27.9)));     std::cout << canberra << std::endl; } */ } 

here conversion methods use boost units , angles:

double todegrees(const angle & angle) {     return static_cast<boost::units::quantity<boost::units::degree::plane_angle>>(angle).value(); }  double toradians(const angle & angle) {     return static_cast<boost::units::quantity<boost::units::si::plane_angle>>(angle).value(); } 

these complemented type-safe factories:

angle degrees(double angleindegrees) {     return angleindegrees * boost::units::degree::degrees; }  angle radians(double angleinradians) {     return angle(angleinradians * boost::units::si::radians); } 

to capture degrees, minutes, seconds, replace degrees doubles above conversion struct this:

struct dms {     dms(double value)     {         degrees = std::floor(value);         double rem = (value-degrees) * 60;         minutes = std::floor(rem);         seconds = (rem-minutes) * 60;     }      operator double() const     {         return degrees + minutes/60 + seconds/3600;     }      double degrees;     double minutes;     double seconds; };