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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>
date Mon, 06 Jan 2020 22:29:51 -0500
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children bd51beb6205e
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1 /*
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2
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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
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8
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9 This file is part of Octave.
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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.
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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.
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20
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21 You should have received a copy of the GNU General Public License
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22 along with Octave; see the file COPYING. If not, see
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23 <https://www.gnu.org/licenses/>.
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24
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25 */
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26
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27 #if ! defined (octave_action_container_h)
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28 #define octave_action_container_h 1
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29
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30 #include "octave-config.h"
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31
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32 #include <functional>
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33
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34 // This class allows registering actions in a list for later
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35 // execution, either explicitly or when the container goes out of
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36 // scope.
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37
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38 // FIXME: is there a better name for this class?
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39
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40 namespace octave
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41 {
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42 class
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43 action_container
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44 {
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45 public:
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46
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47 // A generic unwind_protect element. Knows how to run itself and
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48 // discard itself. Also, contains a pointer to the next element.
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49 class elem
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50 {
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51 public:
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52
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53 friend class action_container;
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54
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55 elem (void) { }
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56
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57 // No copying!
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58
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59 elem (const elem&) = delete;
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60
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61 elem& operator = (const elem&) = delete;
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62
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63 virtual ~elem (void) = default;
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64
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65 virtual void run (void) { }
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66 };
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67
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68 // An element that merely runs a void (*)(void) function.
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69
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70 class fcn_elem : public elem
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71 {
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72 public:
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73
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74 template <typename F, typename... Args>
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75 fcn_elem (F&& fcn, Args&&... args)
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76 : m_fcn (std::bind (fcn, args...))
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77 { }
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78
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79 void run (void) { m_fcn (); }
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80
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81 private:
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82
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83 std::function<void (void)> m_fcn;
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84 };
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85
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86 // An element that stores arbitrary variable, and restores it.
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87
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88 template <typename T>
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89 class restore_var_elem : public elem
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90 {
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91 public:
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92
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93 restore_var_elem (T& ref, const T& val)
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94 : m_ptr (&ref), m_val (val) { }
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95
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96 // No copying!
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97
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98 restore_var_elem (const restore_var_elem&) = delete;
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99
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100 restore_var_elem& operator = (const restore_var_elem&) = delete;
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101
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102 void run (void) { *m_ptr = m_val; }
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103
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104 private:
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105
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106 T *m_ptr, m_val;
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107 };
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108
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109 // Deletes a class allocated using new.
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110
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111 template <typename T>
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112 class delete_ptr_elem : public elem
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113 {
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114 public:
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115
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116 delete_ptr_elem (T *ptr)
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117 : m_ptr (ptr) { }
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118
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119 // No copying!
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120
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121 delete_ptr_elem (const delete_ptr_elem&) = delete;
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122
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123 delete_ptr_elem operator = (const delete_ptr_elem&) = delete;
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124
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125 void run (void) { delete m_ptr; }
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126
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127 private:
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128
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129 T *m_ptr;
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130 };
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131
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132 action_container (void) { }
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133
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134 // No copying!
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135
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136 action_container (const action_container&) = delete;
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137
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138 action_container& operator = (const action_container&) = delete;
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139
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140 virtual ~action_container (void) = default;
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141
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142 template <typename F, typename... Args>
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143 void add (F&& fcn, Args&&... args)
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144 {
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145 add_action (new fcn_elem (std::forward<F> (fcn),
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146 std::forward<Args> (args)...));
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147 }
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148
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149 // Use separate template types for function pointer parameter
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150 // declarations and captured arguments so that differences in
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151 // const are handled properly.
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152
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153 template <typename... Params, typename... Args>
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154 void add_fcn (void (*fcn) (Params...), Args&&... args)
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155 {
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156 add_action (new fcn_elem (fcn, std::forward<Args> (args)...));
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157 }
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158
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159 template <typename T, typename... Params, typename... Args>
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160 void add_method (T *obj, void (T::*method) (Params...), Args&&... args)
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161 {
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162 add_action (new fcn_elem (method, obj, std::forward<Args> (args)...));
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163 }
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164
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165 template <typename T, typename... Params, typename... Args>
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166 void add_method (T& obj, void (T::*method) (Params...), Args&&... args)
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167 {
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168 add_action (new fcn_elem (method, &obj, std::forward<Args> (args)...));
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169 }
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170
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171 // Call to delete (T*).
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172
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173 template <typename T>
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174 void add_delete (T *obj)
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175 {
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176 add_action (new delete_ptr_elem<T> (obj));
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177 }
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178
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179 // Protect any variable.
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180 template <typename T>
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181 void protect_var (T& var)
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182 {
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183 add_action (new restore_var_elem<T> (var, var));
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184 }
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185
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186 // Protect any variable, value given.
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187 template <typename T>
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188 void protect_var (T& var, const T& val)
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189 {
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190 add_action (new restore_var_elem<T> (var, val));
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191 }
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192
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193 operator bool (void) const { return ! empty (); }
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194
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195 virtual void run_first (void) = 0;
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196
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197 void run (size_t num);
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198
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199 void run (void) { run (size ()); }
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200
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201 virtual void discard_first (void) = 0;
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202
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203 void discard (size_t num)
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204 {
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205 if (num > size ())
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206 num = size ();
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207
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208 for (size_t i = 0; i < num; i++)
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209 discard_first ();
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210 }
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211
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212 void discard (void) { discard (size ()); }
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213
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214 virtual size_t size (void) const = 0;
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215
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216 bool empty (void) const { return size () == 0; }
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217
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218 protected:
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219
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220 virtual void add_action (elem *new_elem) = 0;
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221 };
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222 }
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223
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224 #endif