[gdal-dev] How does OGRFeature::GetFieldAsDouble handle NULL values

[Paul Meems]

We're using GDAL v2.1.2 on Windows.

We use the GDAL library with MapWinGIS to connect to a PostGIS database.
When the PostGIS table has NULL values in integer, numeric or double fields
and that data is read the returned values are 0 (zero), which is unexpected
by us.

We use Feature->GetFieldAsDouble() and Feature->GetFieldAsInteger().
Am I correct that these function return 0 when the database value is NULL?
If not our implementation is wrong and I need to continue my search.
The documentation
http://www.gdal.org/classOGRFeature.html#ab8a57c94e8bb8ffac5e7048d896254b4
doesn't say either way.

Thanks,

Paul
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