LWGEOM_z_point()

Datum LWGEOM_z_point

(

PG_FUNCTION_ARGS

)

Definition at line 641 of file lwgeom_ogc.c.

{
        GSERIALIZED *geom = PG_GETARG_GSERIALIZED_P(0);
        POINT4D pt;
 
        if (gserialized_get_type(geom) != POINTTYPE)
                lwpgerror("Argument to ST_Z() must have type POINT");
 
        if (!gserialized_has_z(geom) || (gserialized_peek_first_point(geom, &pt) == LW_FAILURE))
        {
                PG_RETURN_NULL();
        }
        PG_RETURN_FLOAT8(pt.z);
}

References gserialized_get_type(), gserialized_has_z(), gserialized_peek_first_point(), LW_FAILURE, POINTTYPE, and POINT4D::z.

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