[Gdal-dev] Testing arguments in the swig-bindings

[Ari Jolma]

This relates to ticket #1602 (http://trac.osgeo.org/gdal/ticket/1602), 
which I opened a while ago since I'm concerned about programs (including 
interactive programs) failing with segfault since undefined variables 
are mapped to NULLs in the swig bindings and GDAL is not always prepared 
to receive NULLs as arguments. This happens at least in the case of Perl.

Mateusz has implemented object pointer checks into the C API, which 
takes care of many of these problems but not all and it is perhaps not 
sensible to make the C API bullet-proof in this sense.

I'd like to continue this work, and add more checks, probably into the 
swig bindings. I'd like to know, if other swig binding developers have 
ideas or concerns regarding this?

Cheers,

Ari