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cdef extern from "geodesic.h" nogil:
    struct geod_geodesic:
        pass
    struct geod_geodesicline:
        double lat1
        double lon1
        double azi1
        double a
        double f
        double salp1
        double calp1
        double a13
        double s13
        unsigned caps

    void geod_init(geod_geodesic* g, double a, double f)
    void geod_direct(
        geod_geodesic* g,
        double lat1,
        double lon1,
        double azi1,
        double s12,
        double* plat2,
        double* plon2,
        double* pazi2)
    void geod_inverse(
        geod_geodesic* g,
        double lat1,
        double lon1,
        double lat2,
        double lon2,
        double* ps12,
        double* pazi1,
        double* pazi2)
    void geod_lineinit(
        geod_geodesicline* l,
        const geod_geodesic* g,
        double lat1,
        double lon1,
        double azi1,
        unsigned caps)
    void geod_inverseline(
        geod_geodesicline* l,
        const geod_geodesic* g,
        double lat1,
        double lon1,
        double lat2,
        double lon2,
        unsigned caps)
    void geod_position(
        geod_geodesicline* l,
        double s12,
        double* plat2,
        double* plon2,
        double* pazi2)
    void geod_polygonarea(
        geod_geodesic* g,
        double lats[],
        double lons[],
        int n,
        double* pA,
        double* pP)

    cdef enum:
        GEODESIC_VERSION_MAJOR
        GEODESIC_VERSION_MINOR
        GEODESIC_VERSION_PATCH


cdef class Geod:
    cdef geod_geodesic _geod_geodesic
    cdef readonly object initstring
    cdef readonly double a
    cdef readonly double b
    cdef readonly double f
    cdef readonly double es
    cdef readonly bint sphere