[Octave-bug-tracker] [bug #55223] can't subsasgn with 2-level index (curly braces + parentheses) with classdef handle

[Sébastien Villemot]

URL:
  <https://savannah.gnu.org/bugs/?55223>

                 Summary: can't subsasgn with 2-level index (curly braces +
parentheses) with classdef handle
                 Project: GNU Octave
            Submitted by: svillemot
            Submitted on: Fri 14 Dec 2018 10:01:53 AM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

Hi,

With a classdef handle, it is impossible to implement a syntax such as:

obj{x}(y) = z;


Even with a proper subsasgn method overload, Octave errors out:

error: object cannot be indexed with `{'


I attach a minimal example.

Below is a backtrace (with mercurial tip) just before the error is printed:

#0  cdef_object_scalar::subsref (this=0x555555bd5210, type="{",
    idx=std::__cxx11::list = {...}, nargout=1, address@hidden: 0,
    context=..., auto_add=true) at libinterp/octave-value/ov-classdef.cc:1462
#1  0x00007ffff7232ece in cdef_object::subsref (auto_add=<optimized out>,
    context=..., address@hidden: 0, nargout=1,
    idx=std::__cxx11::list = {...}, type="{", this=0x55555593f600)
    at ./libinterp/octave-value/ov-classdef.h:284
#2  octave_classdef::subsref (this=0x55555593f5f0, type="{",
    idx=std::__cxx11::list = {...}, auto_add=<optimized out>)
    at libinterp/octave-value/ov-classdef.cc:910
#3  0x00007ffff73d312e in octave_value::subsref (auto_add=true,
    idx=std::__cxx11::list = {...}, type="{", this=0x7fffffffb670)
    at ./libinterp/octave-value/ov.h:425
#4  octave::tree_index_expression::lvalue (this=0x55555596dc20, tw=...)
    at libinterp/parse-tree/pt-idx.cc:227
#5  0x00007ffff73c133f in octave::tree_evaluator::visit_simple_assignment (
    this=0x5555557cf228, expr=...) at libinterp/parse-tree/pt-eval.cc:2667
#6  0x00007ffff7259452 in octave::tree_evaluator::evaluate
(this=0x5555557cf228,
    expr=0x55555593eca0, nargout=<optimized out>)
    at libinterp/parse-tree/pt-eval.h:312
#7  0x00007ffff73bdf1f in octave::tree_evaluator::visit_statement (
    this=0x5555557cf228, stmt=...) at libinterp/parse-tree/pt-eval.cc:2775
#8  0x00007ffff73b3c90 in octave::tree_statement::accept (tw=...,
    this=0x555555bbc090) at libinterp/parse-tree/pt-stmt.h:119
#9  octave::tree_evaluator::visit_statement_list (this=0x5555557cf228,
lst=...)
    at libinterp/parse-tree/pt-eval.cc:2844
#10 0x00007ffff73b7493 in octave::tree_statement_list::accept (tw=...,
    this=0x555555a0f7c0) at libinterp/parse-tree/pt-stmt.h:194
#11 octave::tree_evaluator::execute_user_script
(address@hidden,
    user_script=..., address@hidden, args=...)
    at libinterp/parse-tree/pt-eval.cc:1512






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File Attachments:


-------------------------------------------------------
Date: Fri 14 Dec 2018 10:01:53 AM UTC  Name: bug-classdef-subsasgn.tar.gz 
Size: 495B   By: svillemot

<http://savannah.gnu.org/bugs/download.php?file_id=45649>

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