[Gretl-devel] why no null default arg (non-pointerized) for matrices, strings...

Hi again, so I've revisited the whole story about default function arguments. Some time ago it was decided that for 'string' and 'matrix' types it is possible to mark them as optional by appending '[null]', without using pointers (which is still possible). The same trick doesn't work for the array types 'strings' or 'matrices' (or 'bundles', for that matter). Is there a specific reason? To be clear, this does NOT work: <hansl-fail> function void ch2( strings ss[null]) if exists(ss) print "exists" elif !isnull(ss) print "isn't null" endif end function ch2() </hansl-fail> It would sometimes come in handy for optional array arguments. thanks, sven