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annotate libinterp/parse-tree/pt-binop.cc @ 20770:c1a6c31ac29a

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eliminate more simple uses of error_state * ov-classdef.cc: Eliminate simple uses of error_state.
author John W. Eaton <jwe@octave.org>
date Tue, 06 Oct 2015 00:20:02 -0400
parents b10432a40432
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2
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4197fc428c7d maint: Update copyright notices for 2015.
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3 Copyright (C) 1996-2015 John W. Eaton
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include "error.h"
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28 #include "defun.h"
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29 #include "oct-obj.h"
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30 #include "ov.h"
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31 #include "profiler.h"
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32 #include "pt-binop.h"
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33 #include "pt-bp.h"
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34 #include "pt-walk.h"
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35 #include "variables.h"
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36
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37 // TRUE means we mark | and & expressions for braindead short-circuit
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38 // behavior.
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39 static bool Vdo_braindead_shortcircuit_evaluation = true;
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40
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41 // Binary expressions.
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42
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43 octave_value_list
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44 tree_binary_expression::rvalue (int nargout)
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45 {
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46 octave_value_list retval;
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47
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48 if (nargout > 1)
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49 error ("binary operator '%s': invalid number of output arguments",
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50 oper () . c_str ());
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51 else
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52 retval = rvalue1 (nargout);
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53
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54 return retval;
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55 }
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56
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57 void
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58 tree_binary_expression::matlab_style_short_circuit_warning (const char *op)
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59 {
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60 warning_with_id ("Octave:possible-matlab-short-circuit-operator",
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61 "Matlab-style short-circuit operation performed for operator %s",
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62 op);
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63
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64 braindead_shortcircuit_warning_issued = true;
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65 }
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66
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67 octave_value
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68 tree_binary_expression::rvalue1 (int)
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69 {
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70 octave_value retval;
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71
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72 if (Vdo_braindead_shortcircuit_evaluation
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73 && eligible_for_braindead_shortcircuit)
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74 {
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75 if (op_lhs)
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76 {
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77 octave_value a = op_lhs->rvalue1 ();
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78
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79 if (a.ndims () == 2 && a.rows () == 1 && a.columns () == 1)
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80 {
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81 bool result = false;
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82
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83 bool a_true = a.is_true ();
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84
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85 if (a_true)
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86 {
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87 if (etype == octave_value::op_el_or)
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88 {
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89 matlab_style_short_circuit_warning ("|");
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90 result = true;
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91 goto done;
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92 }
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93 }
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94 else
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95 {
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96 if (etype == octave_value::op_el_and)
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97 {
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98 matlab_style_short_circuit_warning ("&");
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99 goto done;
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100 }
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101 }
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102
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103 if (op_rhs)
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104 {
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105 octave_value b = op_rhs->rvalue1 ();
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106
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107 result = b.is_true ();
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108 }
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109
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110 done:
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111
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112 return octave_value (result);
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113 }
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114 }
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115 }
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116
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117 if (op_lhs)
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118 {
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119 octave_value a = op_lhs->rvalue1 ();
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120
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121 if (a.is_defined () && op_rhs)
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122 {
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123 octave_value b = op_rhs->rvalue1 ();
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124
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125 if (b.is_defined ())
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126 {
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127 BEGIN_PROFILER_BLOCK (tree_binary_expression)
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128
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129 // Note: The profiler does not catch the braindead
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130 // short-circuit evaluation code above, but that should be
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131 // ok. The evaluation of operands and the operator itself
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132 // is entangled and it's not clear where to start/stop
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133 // timing the operator to make it reasonable.
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134
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135 retval = ::do_binary_op (etype, a, b);
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136
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137 END_PROFILER_BLOCK
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138 }
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139 }
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140 }
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141
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142 return retval;
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143 }
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144
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145 std::string
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146 tree_binary_expression::oper (void) const
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147 {
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148 return octave_value::binary_op_as_string (etype);
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jwe
parents:
diff changeset
149 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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diff changeset
150
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jwe
parents: 5307
diff changeset
151 tree_expression *
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parents: 7336
diff changeset
152 tree_binary_expression::dup (symbol_table::scope_id scope,
10315
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parents: 10160
diff changeset
153 symbol_table::context_id context) const
5861
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jwe
parents: 5307
diff changeset
154 {
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
155 tree_binary_expression *new_be
7767
71f068b22fcc scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents: 7336
diff changeset
156 = new tree_binary_expression (op_lhs ? op_lhs->dup (scope, context) : 0,
10315
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John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
157 op_rhs ? op_rhs->dup (scope, context) : 0,
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
158 line (), column (), etype);
5861
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
159
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
160 new_be->copy_base (*this);
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
161
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
162 return new_be;
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
163 }
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
164
2980
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jwe
parents:
diff changeset
165 void
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
166 tree_binary_expression::accept (tree_walker& tw)
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
167 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
168 tw.visit_binary_expression (*this);
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
169 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
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170
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
171 // Boolean expressions.
11586
12df7854fa7c strip trailing whitespace from source files
John W. Eaton <jwe@octave.org>
parents: 11572
diff changeset
172
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173 octave_value_list
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
174 tree_boolean_expression::rvalue (int nargout)
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
175 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
176 octave_value_list retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
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diff changeset
177
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
178 if (nargout > 1)
15466
d174210ce1ec use ' instead of ` in error messages, warnings and most comments
John W. Eaton <jwe@octave.org>
parents: 14138
diff changeset
179 error ("binary operator '%s': invalid number of output arguments",
10315
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John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
180 oper () . c_str ());
2980
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jwe
parents:
diff changeset
181 else
8658
73c4516fae10 New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents: 8011
diff changeset
182 retval = rvalue1 (nargout);
2980
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jwe
parents:
diff changeset
183
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
184 return retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
185 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
186
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
187 octave_value
8658
73c4516fae10 New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents: 8011
diff changeset
188 tree_boolean_expression::rvalue1 (int)
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
189 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
190 octave_value retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
191
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
192 bool result = false;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
193
12921
7820a12baadd Style fixes on comments about profiling operators
Jordi Gutiérrez Hermoso <jordigh@gmail.com>
parents: 12920
diff changeset
194 // This evaluation is not caught by the profiler, since we can't find
7820a12baadd Style fixes on comments about profiling operators
Jordi Gutiérrez Hermoso <jordigh@gmail.com>
parents: 12920
diff changeset
195 // a reasonable place where to time. Note that we don't want to
7820a12baadd Style fixes on comments about profiling operators
Jordi Gutiérrez Hermoso <jordigh@gmail.com>
parents: 12920
diff changeset
196 // include evaluation of LHS or RHS into the timing, but this is
7820a12baadd Style fixes on comments about profiling operators
Jordi Gutiérrez Hermoso <jordigh@gmail.com>
parents: 12920
diff changeset
197 // entangled together with short-circuit evaluation here.
12920
5d18231eee00 Extend profiling support to operators.
Daniel Kraft <d@domob.eu>
parents: 12822
diff changeset
198
2980
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jwe
parents:
diff changeset
199 if (op_lhs)
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
200 {
8658
73c4516fae10 New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents: 8011
diff changeset
201 octave_value a = op_lhs->rvalue1 ();
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
202
20764
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
203 bool a_true = a.is_true ();
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
204
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
205 if (a_true)
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
206 {
20764
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
207 if (etype == bool_or)
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
208 {
20764
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John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
209 result = true;
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
210 goto done;
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
211 }
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
212 }
20764
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
213 else
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
214 {
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
215 if (etype == bool_and)
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
216 goto done;
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
217 }
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
218
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
219 if (op_rhs)
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
220 {
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
221 octave_value b = op_rhs->rvalue1 ();
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
222
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
223 result = b.is_true ();
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
224 }
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
225
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
226 done:
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
227
b10432a40432 eliminate more simple uses of error_state
John W. Eaton <jwe@octave.org>
parents: 20373
diff changeset
228 retval = octave_value (result);
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
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parents:
diff changeset
229 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
230
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
231 return retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
232 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
233
3536
e8fbc8c3d6d9 [project @ 2000-02-02 12:01:00 by jwe]
jwe
parents: 3534
diff changeset
234 std::string
2980
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jwe
parents:
diff changeset
235 tree_boolean_expression::oper (void) const
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
236 {
3523
b80bbb43a1a9 [project @ 2000-02-02 10:25:52 by jwe]
jwe
parents: 2982
diff changeset
237 std::string retval = "<unknown>";
2980
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
238
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
239 switch (etype)
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
240 {
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
241 case bool_and:
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
242 retval = "&&";
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
243 break;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
244
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
245 case bool_or:
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
246 retval = "||";
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
247 break;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
248
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
249 default:
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
250 break;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
251 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
252
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
253 return retval;
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
254 }
cd5ad3fd8049 [project @ 1997-05-16 01:12:13 by jwe]
jwe
parents:
diff changeset
255
5861
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
256 tree_expression *
7767
71f068b22fcc scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents: 7336
diff changeset
257 tree_boolean_expression::dup (symbol_table::scope_id scope,
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
258 symbol_table::context_id context) const
5861
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
259 {
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
260 tree_boolean_expression *new_be
7767
71f068b22fcc scope and context fixes for function handles
John W. Eaton <jwe@octave.org>
parents: 7336
diff changeset
261 = new tree_boolean_expression (op_lhs ? op_lhs->dup (scope, context) : 0,
10315
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
262 op_rhs ? op_rhs->dup (scope, context) : 0,
57a59eae83cc untabify src C++ source files
John W. Eaton <jwe@octave.org>
parents: 10160
diff changeset
263 line (), column (), etype);
5861
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
264
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
265 new_be->copy_base (*this);
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
266
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
267 return new_be;
2a6cb4ed8f1e [project @ 2006-06-16 05:09:41 by jwe]
jwe
parents: 5307
diff changeset
268 }
11091
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
269
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
270 DEFUN (do_braindead_shortcircuit_evaluation, args, nargout,
17787
175b392e91fe Use GNU style coding conventions for code in libinterp/
Rik <rik@octave.org>
parents: 17744
diff changeset
271 "-*- texinfo -*-\n\
11091
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
272 @deftypefn {Built-in Function} {@var{val} =} do_braindead_shortcircuit_evaluation ()\n\
11572
7d6d8c1e471f Grammarcheck Texinfo for files in src directory.
Rik <octave@nomad.inbox5.com>
parents: 11523
diff changeset
273 @deftypefnx {Built-in Function} {@var{old_val} =} do_braindead_shortcircuit_evaluation (@var{new_val})\n\
13951
79aa00a94e9e doc: Document "local" option for configuration variables.
Rik <octave@nomad.inbox5.com>
parents: 13141
diff changeset
274 @deftypefnx {Built-in Function} {} do_braindead_shortcircuit_evaluation (@var{new_val}, \"local\")\n\
11091
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
275 Query or set the internal variable that controls whether Octave will\n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
276 do short-circuit evaluation of @samp{|} and @samp{&} operators inside the\n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
277 conditions of if or while statements.\n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
278 \n\
11572
7d6d8c1e471f Grammarcheck Texinfo for files in src directory.
Rik <octave@nomad.inbox5.com>
parents: 11523
diff changeset
279 This feature is only provided for compatibility with @sc{matlab} and should\n\
11091
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
280 not be used unless you are porting old code that relies on this feature.\n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
281 \n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
282 To obtain short-circuit behavior for logical expressions in new programs,\n\
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
283 you should always use the @samp{&&} and @samp{||} operators.\n\
13951
79aa00a94e9e doc: Document "local" option for configuration variables.
Rik <octave@nomad.inbox5.com>
parents: 13141
diff changeset
284 \n\
17281
bc924baa2c4e doc: Add new @qcode macro for code samples which are quoted.
Rik <rik@octave.org>
parents: 15467
diff changeset
285 When called from inside a function with the @qcode{\"local\"} option, the\n\
20373
075a5e2e1ba5 doc: Update more docstrings to have one sentence summary as first line.
Rik <rik@octave.org>
parents: 19898
diff changeset
286 variable is changed locally for the function and any subroutines it calls.\n\
17281
bc924baa2c4e doc: Add new @qcode macro for code samples which are quoted.
Rik <rik@octave.org>
parents: 15467
diff changeset
287 The original variable value is restored when exiting the function.\n\
11091
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
288 @end deftypefn")
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
parents: 10315
diff changeset
289 {
18126
d76f790b4eec enable do_braindead_shortcircuit_evaluation by default and deprecate
John W. Eaton <jwe@octave.org>
parents: 17787
diff changeset
290 static bool warned = false;
d76f790b4eec enable do_braindead_shortcircuit_evaluation by default and deprecate
John W. Eaton <jwe@octave.org>
parents: 17787
diff changeset
291 if (! warned)
d76f790b4eec enable do_braindead_shortcircuit_evaluation by default and deprecate
John W. Eaton <jwe@octave.org>
parents: 17787
diff changeset
292 {
d76f790b4eec enable do_braindead_shortcircuit_evaluation by default and deprecate
John W. Eaton <jwe@octave.org>
parents: 17787
diff changeset
293 warned = true;
d76f790b4eec enable do_braindead_shortcircuit_evaluation by default and deprecate
John W. Eaton <jwe@octave.org>
parents: 17787
diff changeset
294 warning_with_id ("Octave:deprecated-function",
d76f790b4eec enable do_braindead_shortcircuit_evaluation by default and deprecate
John W. Eaton <jwe@octave.org>
parents: 17787
diff changeset
295 "do_braindead_shortcircuit_evaluation is obsolete and will be removed from a future version of Octave");
d76f790b4eec enable do_braindead_shortcircuit_evaluation by default and deprecate
John W. Eaton <jwe@octave.org>
parents: 17787
diff changeset
296 }
d76f790b4eec enable do_braindead_shortcircuit_evaluation by default and deprecate
John W. Eaton <jwe@octave.org>
parents: 17787
diff changeset
297
11091
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
John W. Eaton <jwe@octave.org>
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298 return SET_INTERNAL_VARIABLE (do_braindead_shortcircuit_evaluation);
5677f3f7b5fa Matlab compatible short-circuit behavior for & and | operators
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299 }
18130
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300
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301 /*
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302 %!test
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303 %! x = 0;
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304 %! do_braindead_shortcircuit_evaluation (0);
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305 %! if (1 | (x = 1))
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306 %! endif
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307 %! assert (x, 1);
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308 %! do_braindead_shortcircuit_evaluation (1);
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309 %! if (1 | (x = 0))
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310 %! endif
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311 %! assert (x, 1);
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312 */