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annotate libinterp/corefcn/interpreter.h @ 23511:232c8d69d934

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manage interpreter instance in interpreter object Currently it is only possible to have one application or interpreter object. Enforce that restriction. * octave.h, octave.cc (application::the_interpreter): Delete. (application::application): Ensure only one application is created at once. * interpreter.cc, interpreter.h (interpreter::instance): New static variable. (interpreter::interpreter): Ensure only one is created at once. (interpreter::~interpreter): Set instance to nullptr. (interpreter::the_interpreter): New function. * interpreter-private.cc, interpreter-private.cc (__get_interpreter__): Delete. Replace all uses with octave::interpreter::the_interpreter.
author John W. Eaton <jwe@octave.org>
date Thu, 18 May 2017 10:53:24 -0400
parents 21baad6b35c4
children 084245f9bd03
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1 /*
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2
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3 Copyright (C) 2002-2017 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
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9 the Free Software Foundation; either version 3 of the License, or
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10 (at your 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
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13 WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License 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 (octave_interpreter_h)
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24 #define octave_interpreter_h 1
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25
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26 #include "octave-config.h"
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27
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28 #include <string>
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29
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30 #include "quit.h"
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31 #include "str-vec.h"
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32
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33 #include "load-path.h"
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34
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35 extern OCTINTERP_API bool quit_allowed;
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36
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37 // TRUE means we are ready to interpret commands, but not everything
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38 // is ready for interactive use.
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39 extern OCTINTERP_API bool octave_interpreter_ready;
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40
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41 // TRUE means we've processed all the init code and we are good to go.
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42 extern OCTINTERP_API bool octave_initialized;
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43
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44 namespace octave
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45 {
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46 class tree_evaluator;
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47
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48 extern tree_evaluator *current_evaluator;
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49
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50 // The application object contains a pointer to the current
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51 // interpreter and the interpreter contains a pointer back to the
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52 // application context so we need a forward declaration for one (or
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53 // both) of them...
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54
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55 class application;
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56
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57 class OCTINTERP_API interpreter
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58 {
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59 public:
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60
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61 // Create an interpreter object and perform basic initialization
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62 // up to the point of reading history and setting the load path.
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63
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64 interpreter (application *app_context = nullptr);
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65
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66 // No copying, at least not yet...
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67
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68 interpreter (const interpreter&) = delete;
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69
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70 interpreter& operator = (const interpreter&) = delete;
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71
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72 // Clean up the interpreter object.
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73
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74 ~interpreter (void);
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75
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76 // If creating an embedded interpreter, you may inhibit reading
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77 // the command history file by calling initialize_history with
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78 // read_history_file = false prior to calling initialize.
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79
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80 void initialize_history (bool read_history_file = false);
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81
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82 // If creating an embedded interpreter, you may inhibit setting
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83 // the default compiled-in path by calling intialize_load_path
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84 // with set_initial_path = false prior calling initialize. After
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85 // that, you can add directories to the load path to set up a
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86 // custom path.
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87
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88 void initialize_load_path (bool set_initial_path = true);
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89
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90 // Load command line history, set the load path and execute
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91 // startup files. May throw an exit_exception.
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92
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93 int initialize (void);
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94
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95 // Initialize the interpreter and execute --eval option code,
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96 // script files, and/or interactive commands.
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97
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98 int execute (void);
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99
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100 bool interactive (void) const
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101 {
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102 return m_interactive;
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103 }
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104
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105 void interactive (bool arg)
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106 {
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107 m_interactive = arg;
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108 }
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109
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110 void read_site_files (bool flag)
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111 {
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112 m_read_site_files = flag;
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113 }
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114
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115 void read_init_files (bool flag)
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116 {
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117 m_read_init_files = flag;
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118 }
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119
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120 void verbose (bool flag)
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121 {
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122 m_verbose = flag;
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123 }
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124
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125 void inhibit_startup_message (bool flag)
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126 {
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127 m_inhibit_startup_message = flag;
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128 }
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129
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130 bool initialized (void) const
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131 {
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132 return m_initialized;
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133 }
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134
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135 load_path& get_load_path (void)
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136 {
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137 return m_load_path;
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138 }
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139
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140 static void recover_from_exception (void);
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141
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142 static void add_atexit_function (const std::string& fname);
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143
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144 static bool remove_atexit_function (const std::string& fname);
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145
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146 static interpreter * the_interpreter (void) { return instance; }
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147
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148 private:
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149
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150 // The interpreter instance; Currently it is only possible to
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151 // have one.
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152 static interpreter *instance;
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153
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154 static std::list<std::string> atexit_functions;
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155
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156 void display_startup_message (void) const;
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157
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158 int execute_startup_files (void) const;
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159
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160 int execute_eval_option_code (void);
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161
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162 int execute_command_line_file (void);
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163
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164 int main_loop (void);
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165
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166 void cleanup (void);
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167
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168 application *m_app_context;
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169
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170 tree_evaluator *m_evaluator;
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171
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172 load_path m_load_path;
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173
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174 // TRUE means this is an interactive interpreter (forced or not).
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175 bool m_interactive;
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176
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177 bool m_read_site_files;
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178
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179 bool m_read_init_files;
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180
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181 bool m_verbose;
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182
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183 bool m_inhibit_startup_message;
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184
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185 bool m_load_path_initialized;
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186
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187 bool m_history_initialized;
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188
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189 bool m_initialized;
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190 };
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191 }
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192
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193 #if defined (OCTAVE_USE_DEPRECATED_FUNCTIONS)
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194
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195 OCTAVE_DEPRECATED ("use 'octave::interpreter::recover_from_exception' instead")
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196 static inline void
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197 recover_from_exception (void)
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198 {
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199 octave::interpreter::recover_from_exception ();
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200 }
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201
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202 OCTAVE_DEPRECATED ("use 'octave::interpreter::add_atexit_function' instead")
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203 static inline void
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204 add_atexit_function (const std::string& fname)
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205 {
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206 octave::interpreter::add_atexit_function (fname);
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207 }
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208
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209 OCTAVE_DEPRECATED ("use 'octave::interpreter::remove_atexit_function' instead")
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210 static inline bool
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211 remove_atexit_function (const std::string& fname)
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212 {
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213 return octave::interpreter::remove_atexit_function (fname);
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214 }
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215
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216 #endif
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217
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218 #endif