Editing Classdef

This page is a stub. We should begin documenting what classdef is implemented and what is not.

=== Not Supported ===

* '''enumeration'''

See {{bug|44582}} and help implementing it.


* '''build-in class as superclass'''
<source lang="octave">
classdef nonsense < uint32

end
</source>

See {{bug|44035}}

* '''[http://www.mathworks.com/help/matlab/matlab_oop/redefining-concatenation-for-your-class.html concatenating objects] into [http://www.mathworks.com/help/matlab/matlab_oop/initialize-object-arrays.html array of objects].''' 

Example:
<source lang="octave">
classdef MyClass < handle
end

c = MyClass();
cc = [c, c];   % won't work
</source>

For now you can use a cell-array of objects instead:
<source lang="octave">
cc = {c, c};   % ok
</source>

Also see {{bug|44665}}

* '''[http://www.mathworks.com/help/matlab/matlab_oop/mutable-and-immutable-properties.html Immutable property] set access.'''
Example:
<source lang="octave">
classdef MyClass < handle
    properties (SetAccess = immutable)
        x
    end
    methods
        function obj = MyClass()
            x = rand();
        end
    end
end
</source>

Use "private" properties as workaround.


* '''Function handles to package methods and static class methods.'''
For example if we have <code>+mypackage/myfunc.m</code>, creating a function handle as <code>fh = @mypackage.myfunc</code> won't work.
As a workaround, we can create an indirection using an anonymous function <code>fh = @(varargin) mypackage.myfunc(varargin{:})</code>.
Similarly for static class methods where <code>fh = @MyClass.myfunc</code> isn't yet supported. Another workaround for package function handles is to use <code>str2func</code>, e.g. <code>fh = str2func ("mypackage.myfunc")</code>.

A fuller example is also given below:
<source lang="octave">
classdef method_function_handle_test

%  properties
%  
%  
%  end
  
  properties (Hidden, SetAccess = protected)
    hfoo = [];% handle to function
  end
  
  methods
  
    function self = method_function_handle_test ()
      self.hfoo = @foo;    
    end
    
    function bar (self)
        self.hfoo (self); 
    end

  end
  
  methods (Hidden, Access = protected)
    function foo (self)
      disp ('hello!');
    end
  end

end
</source>
Then running:
<source lang="text">
>> x = method_function_handle_test
error: @foo: no function and no method found
error: called from
    method_function_handle_test at line 17 column 17
stopped in <****>/scratch/mfiles/octave_tests/method_function_handle_test.m at line 17
17:       self.hfoo = @foo;
</source>


* '''Defining [http://www.mathworks.com/help/matlab/matlab_oop/specifying-methods-and-functions.html#br2la89 local functions] in the same classdef-file is not working.''' 
For example, the following code gives a syntax/parse error:
<source lang="octave">
classdef MyClass
    methods
        function obj = MyClass()
            myfunc()
        end
    end
end

function myfunc()
    disp('myfunc')
end
</source>

See {{bug|41723}}.

* '''debugging in classdef methods (and +package directory functions)'''

Breakpoints cannot currently be set in classdef methods from the gui, but only from the command line:
<source lang="octave">
dbstop @aclass\amethod 
</source>

* '''Saving/reading classdef objects to/from (.mat) file'''

=== Supported ===

* methods
** static
** private

* properties
** SetAccess (public/private/protected)

==== Classdef examples in the wild ====

* http://hg.savannah.gnu.org/hgweb/octave/file/tip/scripts/general/inputParser.m
* https://github.com/markuman/go-redis
* https://github.com/PetrKryslUCSD/FinEALE