Classdef
This page is a stub. We should begin documenting what classdef is implemented and what is not.
Not Supported
- enumeration
See #44582 and help implementing it.
- build-in class as superclass
classdef nonsense < uint32
end
See #44035
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
Also see #44665
- Immutable property set access.
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. Another workaround for package function handles is to use str2func, e.g. fh = str2func ("mypackage.myfunc").
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;
- Defining local functions in the same classdef-file is not working.
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
See #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:
dbstop @aclass\amethod
- Saving/reading classdef objects to/from (.mat) file
Supported
- methods
- static
- private
- properties
- SetAccess (public/private/protected)