Mercurial > octave
annotate libinterp/octave-value/ov-oncleanup.cc @ 21739:c4ab2e54f100
use namespace for oct_mach_info class
* mach-info.h, mach-info.cc: Put oct_mach_info in octave namespace and
rename to mach_info. Change all uses.
author | John W. Eaton <jwe@octave.org> |
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date | Thu, 19 May 2016 01:59:35 -0400 |
parents | aba2e6293dd8 |
children | f4d7d0eb5b0c |
rev | line source |
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1 /* |
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2 |
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3 Copyright (C) 2010-2015 VZLU Prague |
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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 |
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23 #if defined (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 "defun.h" |
14015 | 28 #include "ov-oncleanup.h" |
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29 #include "ov-fcn.h" |
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30 #include "ov-usr-fcn.h" |
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31 #include "pt-misc.h" |
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32 #include "toplev.h" |
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33 |
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34 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_oncleanup, "onCleanup", |
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35 "onCleanup"); |
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36 |
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37 octave_oncleanup::octave_oncleanup (const octave_value& f) |
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38 : fcn (f) |
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39 { |
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40 if (f.is_function_handle ()) |
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41 { |
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42 octave_function *fptr = f.function_value (true); |
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43 if (! fptr) |
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44 error ("onCleanup: no default dispatch for function handle"); |
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45 |
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46 octave_user_function *uptr |
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47 = dynamic_cast<octave_user_function *> (fptr); |
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48 |
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49 if (uptr != 0) |
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50 { |
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51 tree_parameter_list *pl = uptr->parameter_list (); |
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52 |
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53 if (pl != 0 && pl->length () > 0) |
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54 warning ("onCleanup: cleanup action takes parameters"); |
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55 } |
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56 } |
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57 else |
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58 { |
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59 fcn = octave_value (); |
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60 error ("onCleanup: argument must be a function handle"); |
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61 } |
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62 } |
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63 |
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64 octave_oncleanup::~octave_oncleanup (void) |
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65 { |
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66 if (fcn.is_undefined ()) |
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67 return; |
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68 |
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69 unwind_protect frame; |
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70 |
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71 // Clear interrupts. |
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72 frame.protect_var (octave_interrupt_state); |
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73 octave_interrupt_state = 0; |
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74 |
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75 // Disallow quit(). |
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76 frame.protect_var (quit_allowed); |
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77 quit_allowed = false; |
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78 |
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79 try |
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80 { |
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81 // Run the actual code. |
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82 fcn.do_multi_index_op (0, octave_value_list ()); |
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83 } |
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84 catch (const octave_interrupt_exception&) |
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85 { |
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86 recover_from_exception (); |
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87 |
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88 warning ("onCleanup: interrupt occurred in cleanup action"); |
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89 } |
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90 catch (const octave_execution_exception&) |
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91 { |
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92 throw; |
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93 } |
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94 catch (...) // Yes, the black hole. We're in a d-tor. |
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95 { |
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96 // This shouldn't happen, in theory. |
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97 error ("onCleanup: internal error: unhandled exception in cleanup action"); |
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98 } |
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99 } |
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100 |
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101 octave_scalar_map |
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102 octave_oncleanup::scalar_map_value (void) const |
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103 { |
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104 octave_scalar_map retval; |
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105 retval.setfield ("task", fcn); |
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106 return retval; |
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107 } |
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108 |
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109 bool |
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110 octave_oncleanup::save_ascii (std::ostream& /* os */) |
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111 { |
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112 warning ("save: unable to save onCleanup variables, skipping"); |
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113 |
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114 return true; |
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115 } |
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116 |
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117 bool |
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118 octave_oncleanup::load_ascii (std::istream& /* is */) |
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119 { |
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120 // Silently skip object that was not saved |
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121 return true; |
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122 } |
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123 |
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124 bool |
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125 octave_oncleanup::save_binary (std::ostream& /* os */, |
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126 bool& /* save_as_floats */) |
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127 { |
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128 warning ("save: unable to save onCleanup variables, skipping"); |
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129 |
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130 return true; |
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131 } |
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132 |
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133 bool |
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134 octave_oncleanup::load_binary (std::istream& /* is */, bool /* swap */, |
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135 octave::mach_info::float_format /* fmt */) |
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136 { |
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137 // Silently skip object that was not saved |
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138 return true; |
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139 } |
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140 |
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141 bool |
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142 octave_oncleanup::save_hdf5 (octave_hdf5_id /* loc_id */, |
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143 const char * /* name */, |
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144 bool /* save_as_floats */) |
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145 { |
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146 warning ("save: unable to save onCleanup variables, skipping"); |
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147 |
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148 return true; |
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149 } |
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150 |
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151 bool |
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152 octave_oncleanup::load_hdf5 (octave_hdf5_id /* loc_id */, |
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153 const char * /* name */) |
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154 { |
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155 // Silently skip object that was not saved |
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156 return true; |
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157 } |
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158 |
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159 void |
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160 octave_oncleanup::print (std::ostream& os, bool pr_as_read_syntax) |
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161 { |
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162 print_raw (os, pr_as_read_syntax); |
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163 newline (os); |
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164 } |
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165 |
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166 void |
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167 octave_oncleanup::print_raw (std::ostream& os, bool pr_as_read_syntax) const |
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168 { |
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169 os << "onCleanup ("; |
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170 if (fcn.is_defined ()) |
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171 fcn.print_raw (os, pr_as_read_syntax); |
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172 os << ")"; |
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173 } |
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174 |
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175 DEFUN (onCleanup, args, , |
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176 "-*- texinfo -*-\n\ |
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177 @deftypefn {} {@var{obj} =} onCleanup (@var{function})\n\ |
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178 Create a special object that executes a given function upon destruction.\n\ |
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179 \n\ |
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180 If the object is copied to multiple variables (or cell or struct array\n\ |
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181 elements) or returned from a function, @var{function} will be executed after\n\ |
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182 clearing the last copy of the object. Note that if multiple local onCleanup\n\ |
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183 variables are created, the order in which they are called is unspecified.\n\ |
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184 For similar functionality @xref{The unwind_protect Statement}.\n\ |
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185 @end deftypefn") |
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186 { |
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187 if (args.length () != 1) |
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188 print_usage (); |
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189 |
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190 return ovl (new octave_oncleanup (args(0))); |
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191 } |
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192 |
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193 /* |
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194 %!test |
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195 %! old_wstate = warning ("query"); |
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196 %! unwind_protect |
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197 %! trigger = onCleanup (@() warning ("on", "__MY_WARNING__")); |
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198 %! warning ("off", "__MY_WARNING__"); |
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199 %! assert ((warning ("query", "__MY_WARNING__")).state, "off"); |
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200 %! clear trigger; |
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201 %! assert ((warning ("query", "__MY_WARNING__")).state, "on"); |
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202 %! unwind_protect_cleanup |
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203 %! warning (old_wstate); |
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204 %! end_unwind_protect |
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205 */ |