/**
* <summary>
* Returns the the satellites constellation used to compute
* positioning data.
* <para>
* </para>
* <para>
* </para>
* </summary>
* <returns>
* a value among <c>YGps.CONSTELLATION_GNSS</c>, <c>YGps.CONSTELLATION_GPS</c>,
* <c>YGps.CONSTELLATION_GLONASS</c>, <c>YGps.CONSTELLATION_GALILEO</c>,
* <c>YGps.CONSTELLATION_GPS_GLONASS</c>, <c>YGps.CONSTELLATION_GPS_GALILEO</c> and
* <c>YGps.CONSTELLATION_GLONASS_GALILEO</c> corresponding to the the satellites constellation used to compute
* positioning data
* </returns>
* <para>
* On failure, throws an exception or returns <c>YGps.CONSTELLATION_INVALID</c>.
* </para>
*/
public int get_constellation()
{
if (_func == null)
{
throw new YoctoApiProxyException("No Gps connected");
}
// our enums start at 0 instead of the 'usual' -1 for invalid
return(_func.get_constellation() + 1);
}