[Octave-bug-tracker] [bug #51586] Creating method handle fails using str2func

[Kai Torben Ohlhus]

Follow-up Comment #4, bug #51586 (project octave):

I see, the lazy evaluation was already discussed in bug #31821 and discussed
on the mailing list in 2009.  So this behavior will not be added to Octave, I
guess.

Regarding your patch.  I find your patch useful in the scenario, that you want
to control to use an class overloaded method:


>> noclass = [1 0 -1]
noclass =

   1   0  -1

>> class_p = polynomial (noclass)
class_p =

 1 - X ^ 2

>> fh = str2func ("@polynomial/roots")
fh = @@polynomial/roots
>> roots (class_p)
ans =

  -1
   1

>> roots (noclass)
ans =

  -1
   1

>> fh (class_p)
ans =

  -1
   1

>> fh (noclass)
error: matrix cannot be indexed with .
error: called from
    roots at line 2 column 5


On the other hand, I find this example kind of constructed and is there really
a use case for it, instead of calling the class method directly?  Or does
Octave encourage programmers to adopt "ugly" indirection patterns? ^^

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