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annotate src/unwind-prot.h @ 13294:7dce7e110511

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make concatenation of class objects work * data.h: New file. * src/Makefile.am (octinclude_HEADERS): Add it to the list. * data.cc (attempt_type_conversion): New static function. (do_class_concat): New function. (do_cat): Use it if any elements of the list are objects. Check whether any elements of the list are objects or cells. Check whether all elements of the list are complex. Check whether the first element of the list is a struct. Maybe convert elements of the list to cells. New tests for horzcat and vertcat. * data.h (do_class_concat): Provide decl. * ov-class.h (octave_class::octave_class): Allow optional parent list. * ov.h, ov.h (octave_value::octave_value (const Octave_map&, const std::string&)): Likewise. * pt-mat.cc (do_class_concat): New static function. (tree_matrix::rvalue1): Use it to concatenate objects.
author John W. Eaton <jwe@octave.org>
date Fri, 07 Oct 2011 22:16:07 -0400
parents e0e50f48df37
children 72c96de7a403
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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
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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
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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
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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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78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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22 */
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0b52c68ec81f [project @ 1994-03-09 21:19:44 by jwe]
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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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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 elem (void) : next (0) { }
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47
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48 virtual void run (void) { }
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49
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50 virtual ~elem (void) { }
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51
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52 friend class unwind_protect;
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53
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54 private:
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55
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56 // No copying!
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57
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58 elem (const elem&);
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59
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60 elem& operator = (const elem&);
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61 };
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62
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63 // An element that merely runs a void (*)(void) function.
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64
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65 class fcn_elem : public elem
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66 {
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67 public:
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68 fcn_elem (void (*fptr) (void))
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69 : e_fptr (fptr) { }
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70
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71 void run (void) { e_fptr (); }
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72
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73 private:
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74 void (*e_fptr) (void);
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75 };
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76
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77 // An element that stores a variable of type T along with a void (*) (T)
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78 // function pointer, and calls the function with the parameter.
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79
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80 template <class T>
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81 class fcn_arg_elem : public elem
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82 {
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83 public:
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84 fcn_arg_elem (void (*fcn) (T), T arg)
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85 : e_fcn (fcn), e_arg (arg) { }
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86
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87 void run (void) { e_fcn (e_arg); }
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88
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89 private:
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90
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91 // No copying!
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92
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93 fcn_arg_elem (const fcn_arg_elem&);
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94
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95 fcn_arg_elem& operator = (const fcn_arg_elem&);
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96
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97 void (*e_fcn) (T);
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98 T e_arg;
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99 };
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100
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101 // An element that stores a variable of type T along with a void (*) (const T&)
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102 // function pointer, and calls the function with the parameter.
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103
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104 template <class T>
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105 class fcn_crefarg_elem : public elem
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106 {
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107 public:
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108 fcn_crefarg_elem (void (*fcn) (const T&), T arg)
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109 : e_fcn (fcn), e_arg (arg) { }
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110
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111 void run (void) { e_fcn (e_arg); }
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112
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113 private:
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114 void (*e_fcn) (const T&);
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115 T e_arg;
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116 };
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117
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118 // An element for calling a member function.
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119
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120 template <class T>
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121 class method_elem : public elem
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122 {
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123 public:
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124 method_elem (T *obj, void (T::*method) (void))
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125 : e_obj (obj), e_method (method) { }
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126
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127 void run (void) { (e_obj->*e_method) (); }
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128
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129 private:
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130
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131 T *e_obj;
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132 void (T::*e_method) (void);
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133
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134 // No copying!
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135
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136 method_elem (const method_elem&);
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137
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138 method_elem operator = (const method_elem&);
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139 };
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140
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141 // An element that stores arbitrary variable, and restores it.
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142
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143 template <class T>
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144 class restore_var_elem : public elem
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145 {
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146 public:
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147 restore_var_elem (T& ref, const T& val)
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148 : e_ptr (&ref), e_val (val) { }
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149
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150 void run (void) { *e_ptr = e_val; }
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151
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152 private:
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153
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154 // No copying!
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155
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156 restore_var_elem (const restore_var_elem&);
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157
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158 restore_var_elem& operator = (const restore_var_elem&);
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159
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160 T *e_ptr, e_val;
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161 };
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162
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163 // Deletes a class allocated using new.
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164
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165 template <class T>
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166 class delete_ptr_elem : public elem
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167 {
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168 public:
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169 delete_ptr_elem (T *ptr)
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170 : e_ptr (ptr) { }
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171
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172 void run (void) { delete e_ptr; }
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173
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174 private:
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175
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176 T *e_ptr;
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177
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178 // No copying!
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179
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180 delete_ptr_elem (const delete_ptr_elem&);
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181
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182 delete_ptr_elem operator = (const delete_ptr_elem&);
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183 };
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184
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185 unwind_protect (void) : head () { }
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186
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187 void add (elem *new_elem)
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188 {
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189 new_elem->next = head;
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190 head = new_elem;
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191 }
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192
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193 // For backward compatibility.
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194 void add (void (*fcn) (void *), void *ptr = 0)
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195 {
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196 add (new fcn_arg_elem<void *> (fcn, ptr));
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197 }
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198
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199 // Call to void func (void).
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200 void add_fcn (void (*fcn) (void))
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201 {
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202 add (new fcn_elem (fcn));
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203 }
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204
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205 // Call to void func (T).
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206 template <class T>
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207 void add_fcn (void (*action) (T), T val)
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208 {
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209 add (new fcn_arg_elem<T> (action, val));
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210 }
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211
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212 // Call to void func (const T&).
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213 template <class T>
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214 void add_fcn (void (*action) (const T&), T val)
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215 {
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216 add (new fcn_crefarg_elem<T> (action, val));
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217 }
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218
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219 // Call to T::method (void).
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220 template <class T>
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221 void add_method (T *obj, void (T::*method) (void))
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222 {
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223 add (new method_elem<T> (obj, method));
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224 }
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225
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226 // Call to delete (T*).
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227
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228 template <class T>
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229 void add_delete (T *obj)
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230 {
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231 add (new delete_ptr_elem<T> (obj));
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232 }
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233
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234 // Protect any variable.
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235 template <class T>
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236 void protect_var (T& var)
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237 {
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238 add (new restore_var_elem<T> (var, var));
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239 }
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240
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241 // Protect any variable, value given.
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242 template <class T>
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243 void protect_var (T& var, const T& val)
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244 {
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245 add (new restore_var_elem<T> (var, val));
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246 }
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247
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248 operator bool (void) const
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249 {
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250 return head != 0;
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251 }
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252
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253 void run_top (void)
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254 {
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255 if (head)
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256 {
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257 // No leak on exception!
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258 std::auto_ptr<elem> ptr (head);
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259 head = ptr->next;
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260 ptr->run ();
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261 }
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262 }
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263
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264 void run_top (int num)
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265 {
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266 while (num-- > 0)
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267 run_top ();
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268 }
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269
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270 void discard_top (void)
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271 {
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272 if (head)
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273 {
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274 elem *ptr = head;
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275 head = ptr->next;
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276 delete ptr;
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277 }
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278 }
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279
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280 void discard_top (int num)
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281 {
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282 while (num-- > 0)
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283 discard_top ();
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284 }
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285
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286 void run (void)
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287 {
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288 while (head)
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289 run_top ();
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290 }
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291
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292 void discard (void)
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293 {
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294 while (head)
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295 discard_top ();
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296 }
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297
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298 // Destructor should not raise an exception, so all actions registered should
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299 // be exception-safe (but setting error_state is allowed). If you're not sure,
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300 // see unwind_protect_safe.
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301 ~unwind_protect (void)
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302 {
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303 run ();
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304 }
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305
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306 private:
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307
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308 elem *head;
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309
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310 // No copying!
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311
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312 unwind_protect (const unwind_protect&);
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313
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314 unwind_protect& operator = (const unwind_protect&);
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315 };
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316
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317 // Like unwind_protect, but this one will guard against the possibility of seeing
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318 // an exception (or interrupt) in the cleanup actions. Not that we can do much about
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319 // it, but at least we won't crash.
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320
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321 class
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322 OCTINTERP_API
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323 unwind_protect_safe : public unwind_protect
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324 {
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325 static void gripe_exception (void);
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326
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327 public:
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328 ~unwind_protect_safe (void)
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329 {
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330 while (*this)
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331 {
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332 try
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333 {
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334 run_top ();
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335 }
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336 catch (...) // Yes, the black hole. Remember we're in a dtor.
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337 {
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338 gripe_exception ();
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339 }
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340 }
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341 }
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342 };
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343
1
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344 #endif