Difference between revisions of "Classdef"

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Line 11: Line 11:
  
  
* build-in class as superclass  
+
* '''build-in class as superclass'''
 
<source lang="octave">
 
<source lang="octave">
 
classdef nonsense < uint32
 
classdef nonsense < uint32

Revision as of 02:27, 25 June 2015

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

Not Supported

  • debugging in classdef methods (and +package directory functions)

Breakpoints cannot currently be set in classdef methods (or at least they are ignored). They also can't be set in functions in +package directories (which is a related issue).


  • enumeration


  • build-in class as superclass
classdef nonsense < uint32

end


Example:

classdef MyClass < handle
end

c = MyClass();
cc = [c, c];   % won't work

For now you can use a cell-array of objects instead:

cc = {c, c};   % ok


Example:

classdef MyClass < handle
    properties (SetAccess = immutable)
        x
    end
    methods
        function obj = MyClass()
            x = rand();
        end
    end
end

Use "private" properties as workaround.


  • Function handles to package methods and static class methods.

For example if we have +mypackage/myfunc.m, creating a function handle as fh = @mypackage.myfunc won't work. As a workaround, we can create an indirection using an anonymous function fh = @(varargin) mypackage.myfunc(varargin{:}). Similarly for static class methods where fh = @MyClass.myfunc isn't yet supported.

A fuller example is also given below:

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

Then running:

>> 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;


For example, the following code gives a syntax/parse error:

classdef MyClass
    methods
        function obj = MyClass()
            myfunc()
        end
    end
end

function myfunc()
    disp('myfunc')
end

Supported

  • methods
    • static
    • private
  • properties
    • SetAccess (public/private/protected)

Classdef examples in the wild