How to use the function `pj_geodetic_to_geocentric` in boost library?

Question

In boost/geometry/srs/projections/impl/pj_transform.hpp, I found two functions pj_geodetic_to_geocentric and pj_geocentric_to_geodetic, the function declarations are below:

template <typename T, typename Range>
inline int pj_geocentric_to_geodetic( T const& a, T const& es,
                                      Range & range );
template <typename T, typename Range>
inline int pj_geodetic_to_geocentric( T const& a, T const& es,
                                      Range & range );

each function is manually converted from PROJ4, I am confused, how to use the function? The variable Range &range, how to pass a variable in the function?

I do not know how to use it!! Help me please!

Answer 1

Those functions are used by pj_transform function. It is not clear what you want to compute but you should try to use pj_transform function instead or since your are using the Boost Geometry adaptation of proj4 the transform function. Since there is no documentation on this functionality I recommend reading the tests.