Mercurial > octave
annotate liboctave/util/unwind-prot.h @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
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1 | 1 /* |
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27919
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update Octave Project Developers copyright for the new year
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3 Copyright (C) 1993-2020 The Octave Project Developers |
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4 |
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5 See the file COPYRIGHT.md in the top-level directory of this distribution |
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6 or <https://octave.org/COPYRIGHT.html/>. |
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7 |
1 | 8 |
9 This file is part of Octave. | |
10 | |
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11 Octave is free software: you can redistribute it and/or modify it |
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12 under the terms of the GNU General Public License as published by |
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13 the Free Software Foundation, either version 3 of the License, or |
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14 (at your option) any later version. |
1 | 15 |
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16 Octave is distributed in the hope that it will be useful, but |
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17 WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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19 GNU General Public License for more details. |
1 | 20 |
21 You should have received a copy of the GNU General Public License | |
7016 | 22 along with Octave; see the file COPYING. If not, see |
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23 <https://www.gnu.org/licenses/>. |
1 | 24 |
25 */ | |
26 | |
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27 #if ! defined (octave_unwind_prot_h) |
383 | 28 #define octave_unwind_prot_h 1 |
1 | 29 |
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30 #include "octave-config.h" |
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31 |
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32 #include <cstddef> |
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33 |
15396 | 34 #include <stack> |
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35 #include <memory> |
240 | 36 |
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38 | |
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39 namespace octave |
2985 | 40 { |
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41 class |
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42 OCTAVE_API |
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43 unwind_protect : public action_container |
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44 { |
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45 public: |
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46 |
27177 | 47 unwind_protect (void) : m_lifo () { } |
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49 // No copying! |
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50 |
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51 unwind_protect (const unwind_protect&) = delete; |
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52 |
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53 unwind_protect& operator = (const unwind_protect&) = delete; |
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54 |
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55 // Destructor should not raise an exception, so all actions |
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56 // registered should be exception-safe. If you're not sure, see |
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57 // unwind_protect_safe. |
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58 |
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59 ~unwind_protect (void) { run (); } |
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60 |
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61 operator bool (void) const { return ! empty (); } |
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62 |
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63 void run_first (void) |
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64 { |
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65 if (! empty ()) |
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66 { |
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67 // No leak on exception! |
27177 | 68 std::unique_ptr<elem> ptr (m_lifo.top ()); |
69 m_lifo.pop (); | |
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70 ptr->run (); |
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71 } |
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72 } |
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73 |
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74 void discard_first (void) |
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75 { |
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76 if (! empty ()) |
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77 { |
27177 | 78 elem *ptr = m_lifo.top (); |
79 m_lifo.pop (); | |
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80 delete ptr; |
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81 } |
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82 } |
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83 |
27177 | 84 size_t size (void) const { return m_lifo.size (); } |
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85 |
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86 protected: |
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87 |
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88 virtual void add_action (elem *new_elem) |
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89 { |
27177 | 90 m_lifo.push (new_elem); |
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91 } |
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92 |
27177 | 93 std::stack<elem *> m_lifo; |
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94 }; |
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95 |
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96 // Like unwind_protect, but this one will guard against the possibility |
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97 // of seeing an exception (or interrupt) in the cleanup actions. |
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98 // Not that we can do much about it, but at least we won't crash. |
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99 |
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100 class |
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101 OCTAVE_API |
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102 unwind_protect_safe : public unwind_protect |
15396 | 103 { |
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104 private: |
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105 |
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106 void warn_unhandled_exception (void) const; |
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107 |
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108 public: |
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109 |
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110 unwind_protect_safe (void) : unwind_protect () { } |
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111 |
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112 // No copying! |
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113 |
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114 unwind_protect_safe (const unwind_protect_safe&) = delete; |
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115 |
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116 unwind_protect_safe& operator = (const unwind_protect_safe&) = delete; |
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117 |
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118 ~unwind_protect_safe (void) |
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119 { |
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120 while (! empty ()) |
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121 { |
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122 try |
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123 { |
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124 run_first (); |
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125 } |
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126 catch (...) // Yes, the black hole. Remember we're in a destructor. |
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127 { |
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128 warn_unhandled_exception (); |
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129 } |
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130 } |
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131 } |
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132 }; |
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133 |
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134 // In most cases, the following are preferred for efficiency. Some |
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135 // cases may require the flexibility of the general unwind_protect |
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136 // mechanism defined above. |
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137 |
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138 // Perform action at end of the current scope when unwind_action |
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139 // object destructor is called. |
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140 // |
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141 // For example: |
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142 // |
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143 // void fcn (int val) { ... } |
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144 // |
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145 // ... |
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146 // |
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147 // { |
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148 // int val = 42; |
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149 // |
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150 // // template parameters, std::bind and std::function provide |
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151 // // flexibility in calling forms: |
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152 // |
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153 // unwind_action act1 (fcn, val); |
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154 // unwind_action act2 ([val] (void) { fcn (val); }); |
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155 // } |
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156 // |
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157 // NOTE: Don't forget to provide a name for the unwind_action |
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158 // variable. If you write |
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159 // |
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160 // unwind_action /* NO NAME! */ (...); |
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161 // |
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162 // then the destructor for the temporary anonymous object will be |
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163 // called immediately after the object is constructed instead of at |
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164 // the end of teh current scope. |
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165 |
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166 class unwind_action |
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167 { |
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168 public: |
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169 |
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170 template <typename F, typename... Args> |
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171 unwind_action (F&& fcn, Args&&... args) |
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172 : m_fcn (std::bind (fcn, args...)) |
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173 { } |
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174 |
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175 // No copying! |
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176 |
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177 unwind_action (const unwind_action&) = delete; |
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178 |
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179 unwind_action& operator = (const unwind_action&) = delete; |
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180 |
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181 ~unwind_action (void) { m_fcn (); } |
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182 |
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183 private: |
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184 |
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185 std::function<void (void)> m_fcn; |
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186 }; |
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187 |
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188 // Reset a variable value at the end of the current scope when |
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189 // unwind_protect_var object destructor is called. |
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190 // |
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191 // For example: |
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192 // |
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193 // { |
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194 // int x = 42; |
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195 // unwind_protect_var<int> upv (x); // X will be reset at end of scope |
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196 // x = 13; // Set temporary value. |
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197 // } |
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198 // |
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199 // Temporary value may be set at construction: |
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200 // |
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201 // { |
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202 // int x = ...; |
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203 // unwind_protect_var<int> upv (x, 13); // X will be reset. |
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204 // // temporary value is 13. |
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205 // } |
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206 // |
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207 // NOTE: Don't forget to provide a name for the unwind_protect_var |
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208 // variable. If you write |
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209 // |
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210 // unwind_protect_var<type> /* NO NAME! */ (...); |
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211 // |
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212 // then the destructor for the temporary anonymous object will be |
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213 // called immediately after the object is constructed instead of at |
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214 // the end of teh current scope. |
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215 // |
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216 // FIXME: Once we are able to use C++17, class template argument |
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217 // deduction will allow us to omit the explicit template type from the |
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218 // constructor expression: |
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219 // |
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220 // unwind_protect_var upv (...); |
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221 |
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222 template <typename T> |
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223 class unwind_protect_var |
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224 { |
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225 public: |
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226 |
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227 // Ensure that the value referenced by REF will be reset when this |
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228 // unwind_protect_var object goes out of scope. |
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229 |
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230 explicit unwind_protect_var (T& ref) |
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231 : m_ref (ref), m_val (ref) |
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232 { } |
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233 |
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234 // Set the value referenced by REF to NEW_VAL and ensure that it |
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235 // will be reset to its original value when this |
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236 // unwind_protect_var object goes out of scope. |
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237 |
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238 unwind_protect_var (T& ref, const T& new_val) |
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239 : m_ref (ref), m_val (ref) |
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240 { |
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241 m_ref = new_val; |
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242 } |
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243 |
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244 // No copying! |
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245 |
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246 unwind_protect_var (const unwind_protect_var&) = delete; |
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247 |
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248 unwind_protect_var& operator = (const unwind_protect_var&) = delete; |
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249 |
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250 ~unwind_protect_var (void) |
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251 { |
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252 m_ref = m_val; |
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253 } |
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254 |
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255 private: |
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256 |
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257 T& m_ref; |
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258 T m_val; |
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259 }; |
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260 } |
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261 |
1 | 262 #endif |