annotate scripts/io/is_valid_file_id.m @ 18126:d76f790b4eec gui-release

enable do_braindead_shortcircuit_evaluation by default and deprecate * octave.cc (maximum_braindamage): Don't call Fdo_brainded_shortcircuit_evaluation. * pt-exp.h (tree_expression::mark_braindead_shortcircuit): Eliminate file name argument. * pt-binop.h, pt-binop.cc (tree_binary_expression::mark_braindead_shortcircuit): Likewise. * oct-parse.in.yy (if_cmd_list1, elseif_clause, loop_command): Eliminate argument from call to mark_braindead_shortcircuit. * pt-binop.h, pt-binop.cc (Vdo_braindead_shortcircuit_evaluation): Initialize to true. (tree_binary_expression::matlab_style_short_circuit_warning): New function. (tree_binary_expression::rvalue1): Call matlab_style_short_circuit_warning if short circuit evaluation occurs. (Fdo_braindead_shortcircuit_evaluation): Display deprecated warning. Delete tests for do_braindead_shortcircuit_evaluation. (tree_binary_expression::braindead_shortcircuit_warning_issued): New member variable. * NEWS: Mention change in default value and deprecated function.
author John W. Eaton <jwe@octave.org>
date Wed, 11 Dec 2013 20:51:22 -0500
parents d63878346099
children e90bfaadb489
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d63878346099 maint: Update copyright notices for release.
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1 ## Copyright (C) 2010-2013 John W. Eaton
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} is_valid_file_id (@var{fid})
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21 ## Return true if @var{fid} refers to an open file.
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22 ## @seealso{fopen}
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23 ## @end deftypefn
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25 function retval = is_valid_file_id (fid)
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27 retval = false;
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29 if (nargin == 1)
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30 try
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31 if (isscalar (fid))
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32 [file, mode, arch] = fopen (fid);
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33 retval = ! isempty (file);
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34 endif
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35 end_try_catch
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36 else
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37 print_usage ();
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38 endif
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39
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40 endfunction
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43 %!assert (is_valid_file_id (stdout))
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44 %!assert (! is_valid_file_id ([1,2;3,4]))
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45 %!assert (! is_valid_file_id ("not_a_file_id"))
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46 %!assert (! is_valid_file_id (-1))
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47 %!assert (! is_valid_file_id (pi))
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