[Octave-bug-tracker] [bug #51377] Parse error for abstract methods

[Martynas]

URL:
  <http://savannah.gnu.org/bugs/?51377>

                 Summary: Parse error for abstract methods
                 Project: GNU Octave
            Submitted by: mpata
            Submitted on: Tue 04 Jul 2017 02:27:33 AM EEST
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: Any

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Details:

GNU Octave shows parse error for abstract methods in abstract classes defined
with "classdef".

For example, we have an abstract class:


classdef (Abstract) AbstractIncrementClass
  methods (Static, Abstract)
    [Y] = Increment(X)
  end
end


And a concrete class:


classdef ConcreteIncrementClass < AbstractIncrementClass
  methods (Static)
    function [Y] = Increment(X)
      Y = X + 1;
    end
  end
end


Running command "ConcreteIncrementClass.Increment(1)" results in error message
(path removed):


parse error near line 3 of file ...\AbstractIncrementClass.m

  external methods are only allowed in @-folders

>>>     [Y] = Increment(X)
                        ^


In Matlab it gives the answer (2).

Without "Static" keyword the same error message is shown while running the
constructor of concrete class (Matlab shows no error here as well).




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