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annotate src/unwind-prot.h @ 11586:12df7854fa7c

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strip trailing whitespace from source files
author John W. Eaton <jwe@octave.org>
date Thu, 20 Jan 2011 17:24:59 -0500
parents fd0a3ac60b0e
children f4689107dd8c
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1 /*
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2
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3 Copyright (C) 1993-2011 John W. Eaton
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4 Copyright (C) 2009-2010 VZLU Prague
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5
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6 This file is part of Octave.
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7
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
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12
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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18 You should have received a copy of the GNU General Public License
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19 along with Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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21
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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22 */
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23
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24 #if !defined (octave_unwind_prot_h)
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25 #define octave_unwind_prot_h 1
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26
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27 #include <cstddef>
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29 #include <string>
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30 #include <memory>
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31
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32 // This class allows registering cleanup actions.
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33 class
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34 OCTINTERP_API
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35 unwind_protect
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36 {
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37 public:
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38
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39 // A generic unwind_protect element. Knows how to run itself and discard itself.
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40 // Also, contains a pointer to the next element.
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41 class elem
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42 {
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43 elem *next;
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44
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45 public:
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46 virtual void run (void) { }
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47 virtual ~elem (void) { }
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48
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49 friend class unwind_protect;
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50 };
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51
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52 // An element that merely runs a void (*)(void) function.
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53
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54 class fcn_elem : public elem
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55 {
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56 public:
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57 fcn_elem (void (*fptr) (void))
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58 : e_fptr (fptr) { }
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59
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60 void run (void) { e_fptr (); }
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61
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62 private:
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63 void (*e_fptr) (void);
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64 };
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65
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66 // An element that stores a variable of type T along with a void (*) (T)
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67 // function pointer, and calls the function with the parameter.
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68
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69 template <class T>
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70 class fcn_arg_elem : public elem
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71 {
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72 public:
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73 fcn_arg_elem (void (*fcn) (T), T arg)
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74 : e_fcn (fcn), e_arg (arg) { }
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75
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76 void run (void) { e_fcn (e_arg); }
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77
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78 private:
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79 void (*e_fcn) (T);
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80 T e_arg;
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81 };
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82
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83 // An element that stores a variable of type T along with a void (*) (const T&)
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84 // function pointer, and calls the function with the parameter.
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85
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86 template <class T>
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87 class fcn_crefarg_elem : public elem
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88 {
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89 public:
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90 fcn_crefarg_elem (void (*fcn) (const T&), T arg)
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91 : e_fcn (fcn), e_arg (arg) { }
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92
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93 void run (void) { e_fcn (e_arg); }
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94
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95 private:
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96 void (*e_fcn) (const T&);
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97 T e_arg;
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98 };
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99
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100 // An element for calling a member function.
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101
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102 template <class T>
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103 class method_elem : public elem
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104 {
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105 public:
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106 method_elem (T *obj, void (T::*method) (void))
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107 : e_obj (obj), e_method (method) { }
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108
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109 void run (void) { (e_obj->*e_method) (); }
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110
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111 private:
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112 T *e_obj;
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113 void (T::*e_method) (void);
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114 };
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115
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116 // An element that stores arbitrary variable, and restores it.
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117
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118 template <class T>
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119 class restore_var_elem : public elem
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120 {
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121 public:
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122 restore_var_elem (T& ref, const T& val)
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123 : e_ptr (&ref), e_val (val) { }
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124
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125 void run (void) { *e_ptr = e_val; }
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126
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127 private:
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128 T *e_ptr, e_val;
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129 };
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130
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131 // Deletes a class allocated using new.
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132
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133 template <class T>
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134 class delete_ptr_elem : public elem
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135 {
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136 public:
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137 delete_ptr_elem (T *ptr)
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138 : e_ptr (ptr) { }
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139
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140 void run (void) { delete e_ptr; }
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141
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142 private:
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143 T *e_ptr;
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144 };
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145
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146 unwind_protect (void) : head () { }
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147
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148 void add (elem *new_elem)
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149 {
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150 new_elem->next = head;
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151 head = new_elem;
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152 }
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153
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154 // For backward compatibility.
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155 void add (void (*fcn) (void *), void *ptr = 0)
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156 {
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157 add (new fcn_arg_elem<void *> (fcn, ptr));
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158 }
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159
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160 // Call to void func (void).
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161 void add_fcn (void (*fcn) (void))
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162 {
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163 add (new fcn_elem (fcn));
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164 }
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165
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166 // Call to void func (T).
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167 template <class T>
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168 void add_fcn (void (*action) (T), T val)
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169 {
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170 add (new fcn_arg_elem<T> (action, val));
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171 }
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172
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173 // Call to void func (const T&).
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174 template <class T>
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175 void add_fcn (void (*action) (const T&), T val)
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176 {
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177 add (new fcn_crefarg_elem<T> (action, val));
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178 }
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179
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180 // Call to T::method (void).
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181 template <class T>
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182 void add_method (T *obj, void (T::*method) (void))
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183 {
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184 add (new method_elem<T> (obj, method));
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185 }
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186
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187 // Call to delete (T*).
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188
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189 template <class T>
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190 void add_delete (T *obj)
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191 {
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192 add (new delete_ptr_elem<T> (obj));
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193 }
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194
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195 // Protect any variable.
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196 template <class T>
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197 void protect_var (T& var)
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198 {
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199 add (new restore_var_elem<T> (var, var));
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200 }
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201
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202 // Protect any variable, value given.
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203 template <class T>
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204 void protect_var (T& var, const T& val)
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205 {
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206 add (new restore_var_elem<T> (var, val));
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207 }
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208
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209 operator bool (void) const
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210 {
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211 return head != 0;
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212 }
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213
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214 void run_top (void)
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215 {
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216 if (head)
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217 {
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218 // No leak on exception!
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219 std::auto_ptr<elem> ptr (head);
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220 head = ptr->next;
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221 ptr->run ();
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222 }
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223 }
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224
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225 void run_top (int num)
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226 {
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227 while (num-- > 0)
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228 run_top ();
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229 }
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230
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231 void discard_top (void)
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232 {
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233 if (head)
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234 {
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235 elem *ptr = head;
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236 head = ptr->next;
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237 delete ptr;
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238 }
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239 }
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240
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241 void discard_top (int num)
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242 {
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243 while (num-- > 0)
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244 discard_top ();
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245 }
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246
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247 void run (void)
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248 {
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249 while (head)
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250 run_top ();
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251 }
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252
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253 void discard (void)
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254 {
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255 while (head)
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256 discard_top ();
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257 }
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258
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259 // Destructor should not raise an exception, so all actions registered should
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260 // be exception-safe (but setting error_state is allowed). If you're not sure,
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261 // see unwind_protect_safe.
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262 ~unwind_protect (void)
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263 {
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264 run ();
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265 }
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266
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267 private:
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268
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269 elem *head;
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270 };
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271
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272 // Like unwind_protect, but this one will guard against the possibility of seeing
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273 // an exception (or interrupt) in the cleanup actions. Not that we can do much about
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274 // it, but at least we won't crash.
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275
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276 class
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277 OCTINTERP_API
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278 unwind_protect_safe : public unwind_protect
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279 {
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280 static void gripe_exception (void);
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281
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282 public:
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283 ~unwind_protect_safe (void)
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284 {
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285 while (*this)
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286 {
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287 try
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288 {
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289 run_top ();
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290 }
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291 catch (...) // Yes, the black hole. Remember we're in a dtor.
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292 {
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293 gripe_exception ();
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294 }
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295 }
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296 }
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297 };
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298
1
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299 #endif