Classdef
Supported Features
Properties
Classdef properties are supported but not all attributes are implemented.
| Attribute | Support | Notes |
|---|---|---|
| AbortSet | No | Property does not exist. |
| Abstract | Yes | |
| Access | Partial | |
| Constant | Yes | |
| Dependent | Partial | |
| GetAccess | Partial | |
| GetObservable | No | Property exists but is not used. Requires events and listeners to be implemented in order to work properly. |
| Hidden | Yes | |
| NonCopyable | No | Property does not exist. |
| SetAccess | Partial | |
| SetObservable | No | Property exists but is not used. Requires events and listeners to be implemented in order to work properly. |
| Transient | No | Property exists but is not used. |
Methods
Classdef methods are supported but not all attributes are fully implemented.
| Attribute | Support | Notes |
|---|---|---|
| Abstract | Partial | See bug report #51377 |
| Access | Yes | |
| Hidden | Yes | |
| Sealed | Yes | |
| Static | Yes |
Features that are not implemented
enumeration
Octave should be able to parse the enumeration section of a classdef definition but nothing is done with it. Progress on this feature is tracked in bug report #44582.
events and listeners
Octave should be able to parse the events section of a classdef definition but nothing is done with it. Progress on this feature is tracked in bug report #56194.
built-in class as superclass
Octave does not allow subclassing built-in classes. In Matlab, classdef objects may subclass built-in integer, floating point, and logical types. For example,
classdef nonsense < uint32
...
end
does not work.
Progress on this feature is tracked in bug report #44035.
concatenation of classdef objects
Octave does not support concatenation of classdef objects to create classdef array objects.
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
Progress on this feature is tracked in bug reports #44665 and #53906.
Saving and loading classdef objects
Saving and loading classdef objects is not supported.
Progress on this feature is tracked in bug report #45833
Open Bug Reports for Issues not Described Above
Issues with basic classdef functionality
- 51659 Calling 'methods' on self causes syntax error
- 48682 print_usage fails within classdef block
- 49434 which returns "built-in function" for classdef m-file
- 48041 classdef: `help myclass` messes up `help @myclass/method`
- 43047 help() does not see classdef files
- 42620 exist() does not use "class" argument
- 53874 doc_cache_create doesnt handle classdef documentation
- 52096 meta.class.fromName throws error when class name not found.
- 48693 classdef subsref method is not called with correct nargout value
- 56006 Object indexing: obj(1).property(end+1:n) - end is interpreted wrong
- 55983 'x(ix) = []' deletion syntax does not work for objects
- 55976 cat, repmat, and reshape don't work for classdef objects
- 55961 properties function does not preserve order
- 55768 display of classdef object should not show private or protected properties
- 55766 properties function should not return Hidden properties
- 55746 interpreter fails to instantiate classdef with classdef properties
- 52582 using static method to initialize property value fails
- 45833 support load/save of classdef objects
Classdef and +package directories
- 54941 interpreter cannot find methods in files of classdefs in packages
Arrays of classdef objects
- 44665 error in concatenation of classdef objects
- 53906 Cannot make an object array with square brackets
- 47755 Access to object arrays
- 47241 classdef: assigning property of handle object in object array constructs new object
Debugger (fixes for these are in progress)
- 46451 unable to set breakpoints within classdef classes
- 45404 Breakpoints cannot be set in classdef methods or +package function files
Lower-priority issues
- 55488 Invalid use of colon char as classdef function's argument when subsref is overwritten
- 54966 Error when assigning array to an object implementing subsasgn() subscripted using "{}"
- 54028 copy of non-handle class instance is not deep
- 53811 cellfun does not find overloaded function with function name argument
- 52989 classdef: missing error messages on multiply defined properties
- 52614 setting properties of classdef object during construction with inheritance
- 52582 Dependent constant properties in classdef errors: no such file
- 52123 Indirect memory leak in cdef_manager::initialize ()
- 51285 max_recursion_depth error in classdef constructor
- 50395 subclassing a class that is also defined as a variable fails
- 50011 failure to report error on conflicting methods for classdef
- 49379 classdef constructor: .argn. loses first argument, inputname(n) returns inputname(n+1)
- 55810 sizeof() and whos() returns 0 bytes for classdef objects
- 45893 classdef properties are not reloaded when file is updated
- 44643 classdef handle object can go into an recursive loop with isequal(obj1,obj2) if both are self-referential
- 55755 mxGetProperty does not work with properties marked as Dependent
- 55767 classdef property should not be the same as classdef name (at least for Matlab compatibility)
Documentation
- 50729 Improve OOP documentation
- 47908 Octave:classdef-to-struct not documented in warning_ids.m
- 44590 More documentation for the current status of classdef implementation