[Octave-bug-tracker] [bug #33068] Radio property values are not case insensitive

[John W. Eaton]

Follow-up Comment #3, bug #33068 (project octave):

The problem seems to be that radio_values::validate calls
radio_values::contains and that calls possible_vals.find.  The data member
possible_vals is a std::set<caseless_str> object, but the find fails because
there is no specialized operator to replace the std::less function for
comparison in the set find function.

I'm not sure what the proper way is to write the comparison function for a
caseless_str object.

Note that we don't want to just convert all these strings to lower case when
comparing.  The fix needs to be in caseless_str, adding a comparison function
that will work with STL functions.  Otherwise, what is the point of having a
caseless_str object?  We would always have to remember that to compare, we
need to downcase/upcase the strings we are comparing.

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