Error with function handles of object methods

[WMennerich]

Hello,
I found a bug using objects:
In short words: Function handles of object functions (methods) within
the class directory (beginning with '@') can not be created.

I use Octave V3.2.0 (mingw binary) on WindowsXP.

I hope, this bug report contains enough details,
otherwise just ask please.


W.Mennerich



In the following the tests I made:





function test (<scalar>,<scalar>)
[constructor in the '@test' directory
*********************************
function newtest=test(att1, att2)
%constructor

switch nargin
case 0
newtest.att1=[];
newtest.att2=[];
case 2
newtest.att1=att1;
newtest.att2=att1+att2;
end

newtest=class(newtest,'test');
**********************************


function sumAtts(<test>)
[a method in the '@test' directory
**********************************
function res=sumAtts(this)
res=this.att1+this.att2;



function get(<test>,<string>)
[for testing function overloading,
also inside '@test']
**********************************
function att=get(this,nameAtt)
att=this.(nameAtt);



Test environment:
##################################
##################################

* Create all files

* Create '@test'

* Put all files into '@test'

* Put '@test' into octave path



Running the tests:
##################################
##################################

%Testing the class:
%create three objects and put them into a cell array:

mytest1=test(33,44)
mytest2=test(66,88)
mytest3=test(132,176)

allmytests={mytest1 mytest2 mytest3}


%Workspace of octave shows:


  Attr Name            Size                     Bytes  Class
  ==== ====            ====                     =====  =====
       allmytests      1x3                         48  cell
       mytest1         1x1                         16  test
       mytest2         1x1                         16  test
       mytest3         1x1                         16  test





%Testing of the sumAtts(<test>) function:

> sumAtts(mytest1)
ans =  110


> sumAtts(mytest2)
ans =  220


> sumAtts(mytest3)
ans =  440






%Function 'sumAtts' as input of an anonymous function works:

> cellfun(@(x) sumAtts(x),allmytests)
ans =

   110   220   440



%Also the (overloaded) function  'get' works fine:
> cellfun(@(x) get(x,'att1'),allmytests)
ans =

    33    66   132


%Using cellfun with a sumAtts handle does not work:

> cellfun(@sumAtts,allmytests)
error: error creating function handle "@sumAtts"
error: evaluating argument list element number 1
error: error creating function handle "@sumAtts"
error: evaluating argument list element number 1


%The same also with overloaded 'get' function, gives another error:

> inStrings={'att1' 'att1' 'att1'}
inStrings =

{
  [1,1] = att1
  [1,2] = att1
  [1,3] = att1
}

> cellfun(@get,allmytests,inStrings)
error: octave_base_value::array_value(): wrong type argument `class'
error: get: expecting graphics handle as first argument




%Try to create a function handle outside of cellfun:

> fun=@sumAtts
error: error creating function handle "@sumAtts"

%Non-class-functions work as handle:

> h=@rand
h =

rand


> h(4)
ans =

   0.86496   0.62121   0.37157   0.41806
   0.51272   0.49135   0.41006   0.67037
   0.64824   0.25499   0.91680   0.27943
   0.42406   0.77885   0.16088   0.15369




%Workspace of octave shows:

  Attr Name            Size                     Bytes  Class
  ==== ====            ====                     =====  =====
       allmytests      1x3                         48  cell
       h               1x1                          0  function_handle
       inStrings       1x3                         12  cell
       mytest1         1x1                         16  test
       mytest2         1x1                         16  test
       mytest3         1x1                         16  test



I checked also creating handles from selfwritten functions like e.g. foo.m
this works also fine. Just creating handles from functions which belong to
a user-class (i.e. they are here in the @test directory fail as handle)
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