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[Octave-bug-tracker] [bug #51820] OO: default values invoking constructo
From: |
Ernst Reissner |
Subject: |
[Octave-bug-tracker] [bug #51820] OO: default values invoking constructor without arguments. |
Date: |
Tue, 22 Aug 2017 10:36:42 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:51.0) Gecko/20100101 Firefox/51.0 |
URL:
<http://savannah.gnu.org/bugs/?51820>
Summary: OO: default values invoking constructor without
arguments.
Project: GNU Octave
Submitted by: ernstreissner
Submitted on: Tue 22 Aug 2017 02:36:41 PM UTC
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: dev
Operating System: Any
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Details:
I have written a (legacy) class implementing arithmetics in java, called pn
for polymorphic number.
have a look at
https://www.mathworks.com/help/matlab/matlab_oop/class-constructor-methods.html#btn2kiy,
to be more precise to the guidelines
talking about constructors without arguments.
This refers to
++
When creating or expanding an object array such that not all elements are
given specific values, the class constructor is called with no arguments to
fill in unspecified elements
--
This is true even outside oo:
a(5)=1 on unkown a performs padding a(1)...a(4)
with default value 0.
Consequently,
a(5)=pn(1) performs padding a(1)...a(4)
with default value pn() which represents 0 also in my case.
Unlike prior releases, now pn() does not get invoked.
Instead some raw constructor seems to be invoked,
merely applying function class(...)
but not providing a sensible default value.
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