Mercurial > octave
annotate liboctave/util/action-container.h @ 23442:53f5f8231c37
allow most header files to be compiled separately
* build-aux/mk-opts.pl: Include <limits> in generated header files.
* file-io.h, ls-hdf5.h, ls-mat-ascii.h, ls-mat4.h, ls-mat5.h,
ls-oct-binary.h, ls-oct-text.h, ls-utils.h, mxarray.in.h,
octave-link.h, octave-preserve-stream-state.h, pt-check.h,
pt-tm-const.h, DAERTFunc.h, aepbalance.h, eigs-base.h,
Sparse-diag-op-defs.h, Sparse-op-defs.h, Sparse-perm-op-defs.h,
action-container.h, oct-rl-edit.h, url-transfer.h:
Include additional headers or use forward declarations to allow
successful compilation of the file by itself.
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Wed, 26 Apr 2017 01:20:50 -0400 |
| parents | 442fe5b5afb5 |
| children | 0b4d1575a2e2 |
| rev | line source |
|---|---|
| 15396 | 1 /* |
| 2 | |
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3 Copyright (C) 1993-2017 John W. Eaton |
| 15396 | 4 Copyright (C) 2009-2010 VZLU Prague |
| 5 | |
| 6 This file is part of Octave. | |
| 7 | |
| 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 |
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10 the Free Software Foundation; either version 3 of the License, or |
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11 (at your option) any later version. |
| 15396 | 12 |
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13 Octave is distributed in the hope that it will be useful, but |
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14 WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 GNU General Public License for more details. |
| 15396 | 17 |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with Octave; see the file COPYING. If not, see | |
| 20 <http://www.gnu.org/licenses/>. | |
| 21 | |
| 22 */ | |
| 23 | |
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24 #if ! defined (octave_action_container_h) |
| 15396 | 25 #define octave_action_container_h 1 |
| 26 | |
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27 #include "octave-config.h" |
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28 |
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29 #include <cstddef> |
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30 |
| 15396 | 31 // This class allows registering actions in a list for later |
| 32 // execution, either explicitly or when the container goes out of | |
| 33 // scope. | |
| 34 | |
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35 // FIXME: is there a better name for this class? |
| 15396 | 36 |
| 37 class | |
| 38 action_container | |
| 39 { | |
| 40 public: | |
| 41 | |
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42 // A generic unwind_protect element. Knows how to run itself and |
| 15396 | 43 // discard itself. Also, contains a pointer to the next element. |
| 44 class elem | |
| 45 { | |
| 46 public: | |
| 47 | |
| 48 friend class action_container; | |
| 49 | |
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50 elem (void) { } |
| 15396 | 51 |
| 52 // No copying! | |
| 53 | |
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54 elem (const elem&) = delete; |
| 15396 | 55 |
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56 elem& operator = (const elem&) = delete; |
| 15396 | 57 |
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58 virtual ~elem (void) = default; |
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59 |
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60 virtual void run (void) { } |
| 15396 | 61 }; |
| 62 | |
| 63 // An element that merely runs a void (*)(void) function. | |
| 64 | |
| 65 class fcn_elem : public elem | |
| 66 { | |
| 67 public: | |
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68 |
| 15396 | 69 fcn_elem (void (*fptr) (void)) |
| 70 : e_fptr (fptr) { } | |
| 71 | |
| 72 void run (void) { e_fptr (); } | |
| 73 | |
| 74 private: | |
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75 |
| 15396 | 76 void (*e_fptr) (void); |
| 77 }; | |
| 78 | |
| 79 // An element that stores a variable of type T along with a void (*) (T) | |
| 80 // function pointer, and calls the function with the parameter. | |
| 81 | |
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82 template <typename T> |
| 15396 | 83 class fcn_arg_elem : public elem |
| 84 { | |
| 85 public: | |
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86 |
| 15396 | 87 fcn_arg_elem (void (*fcn) (T), T arg) |
| 88 : e_fcn (fcn), e_arg (arg) { } | |
| 89 | |
| 90 // No copying! | |
| 91 | |
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92 fcn_arg_elem (const fcn_arg_elem&) = delete; |
| 15396 | 93 |
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94 fcn_arg_elem& operator = (const fcn_arg_elem&) = delete; |
| 15396 | 95 |
| 96 void run (void) { e_fcn (e_arg); } | |
| 97 | |
| 98 private: | |
| 99 | |
| 100 void (*e_fcn) (T); | |
| 101 | |
| 102 T e_arg; | |
| 103 }; | |
| 104 | |
| 105 // An element that stores a variable of type T along with a | |
| 106 // void (*) (const T&) function pointer, and calls the function with | |
| 107 // the parameter. | |
| 108 | |
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109 template <typename T> |
| 15396 | 110 class fcn_crefarg_elem : public elem |
| 111 { | |
| 112 public: | |
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113 |
| 15396 | 114 fcn_crefarg_elem (void (*fcn) (const T&), const T& arg) |
| 115 : e_fcn (fcn), e_arg (arg) { } | |
| 116 | |
| 117 void run (void) { e_fcn (e_arg); } | |
| 118 | |
| 119 private: | |
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120 |
| 15396 | 121 void (*e_fcn) (const T&); |
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122 |
| 15396 | 123 T e_arg; |
| 124 }; | |
| 125 | |
| 126 // An element for calling a member function. | |
| 127 | |
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128 template <typename T> |
| 15396 | 129 class method_elem : public elem |
| 130 { | |
| 131 public: | |
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132 |
| 15396 | 133 method_elem (T *obj, void (T::*method) (void)) |
| 134 : e_obj (obj), e_method (method) { } | |
| 135 | |
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136 method_elem (T& obj, void (T::*method) (void)) |
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137 : e_obj (&obj), e_method (method) { } |
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138 |
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139 // No copying! |
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140 |
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141 method_elem (const method_elem&) = delete; |
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142 |
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143 method_elem operator = (const method_elem&) = delete; |
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144 |
| 15396 | 145 void run (void) { (e_obj->*e_method) (); } |
| 146 | |
| 147 private: | |
| 148 | |
| 149 T *e_obj; | |
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150 |
| 15396 | 151 void (T::*e_method) (void); |
| 152 }; | |
| 153 | |
| 154 // An element for calling a member function with a single argument | |
| 155 | |
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156 template <typename T, typename A> |
| 15396 | 157 class method_arg_elem : public elem |
| 158 { | |
| 159 public: | |
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160 |
| 15396 | 161 method_arg_elem (T *obj, void (T::*method) (A), A arg) |
| 162 : e_obj (obj), e_method (method), e_arg (arg) { } | |
| 163 | |
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164 method_arg_elem (T& obj, void (T::*method) (A), A arg) |
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165 : e_obj (&obj), e_method (method), e_arg (arg) { } |
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166 |
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167 // No copying! |
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168 |
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169 method_arg_elem (const method_arg_elem&) = delete; |
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170 |
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171 method_arg_elem operator = (const method_arg_elem&) = delete; |
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172 |
| 15396 | 173 void run (void) { (e_obj->*e_method) (e_arg); } |
| 174 | |
| 175 private: | |
| 176 | |
| 177 T *e_obj; | |
| 178 | |
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179 void (T::*e_method) (A); |
| 15396 | 180 |
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181 A e_arg; |
| 15396 | 182 }; |
| 183 | |
| 184 // An element for calling a member function with a single argument | |
| 185 | |
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186 template <typename T, typename A> |
| 15396 | 187 class method_crefarg_elem : public elem |
| 188 { | |
| 189 public: | |
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190 |
| 15396 | 191 method_crefarg_elem (T *obj, void (T::*method) (const A&), const A& arg) |
| 192 : e_obj (obj), e_method (method), e_arg (arg) { } | |
| 193 | |
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194 method_crefarg_elem (T& obj, void (T::*method) (const A&), const A& arg) |
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195 : e_obj (&obj), e_method (method), e_arg (arg) { } |
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196 |
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197 // No copying! |
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198 |
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199 method_crefarg_elem (const method_crefarg_elem&) = delete; |
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200 |
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201 method_crefarg_elem operator = (const method_crefarg_elem&) = delete; |
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202 |
| 15396 | 203 void run (void) { (e_obj->*e_method) (e_arg); } |
| 204 | |
| 205 private: | |
| 206 | |
| 207 T *e_obj; | |
| 208 | |
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209 void (T::*e_method) (const A&); |
| 15396 | 210 |
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211 A e_arg; |
| 15396 | 212 }; |
| 213 | |
| 214 // An element that stores arbitrary variable, and restores it. | |
| 215 | |
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216 template <typename T> |
| 15396 | 217 class restore_var_elem : public elem |
| 218 { | |
| 219 public: | |
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220 |
| 15396 | 221 restore_var_elem (T& ref, const T& val) |
| 222 : e_ptr (&ref), e_val (val) { } | |
| 223 | |
| 224 // No copying! | |
| 225 | |
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226 restore_var_elem (const restore_var_elem&) = delete; |
| 15396 | 227 |
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228 restore_var_elem& operator = (const restore_var_elem&) = delete; |
| 15396 | 229 |
| 230 void run (void) { *e_ptr = e_val; } | |
| 231 | |
| 232 private: | |
| 233 | |
| 234 T *e_ptr, e_val; | |
| 235 }; | |
| 236 | |
| 237 // Deletes a class allocated using new. | |
| 238 | |
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239 template <typename T> |
| 15396 | 240 class delete_ptr_elem : public elem |
| 241 { | |
| 242 public: | |
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243 |
| 15396 | 244 delete_ptr_elem (T *ptr) |
| 245 : e_ptr (ptr) { } | |
| 246 | |
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247 // No copying! |
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248 |
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249 delete_ptr_elem (const delete_ptr_elem&) = delete; |
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250 |
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251 delete_ptr_elem operator = (const delete_ptr_elem&) = delete; |
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252 |
| 15396 | 253 void run (void) { delete e_ptr; } |
| 254 | |
| 255 private: | |
| 256 | |
| 257 T *e_ptr; | |
| 258 }; | |
| 259 | |
| 260 action_container (void) { } | |
| 261 | |
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262 // No copying! |
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263 |
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264 action_container (const action_container&) = delete; |
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265 |
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266 action_container& operator = (const action_container&) = delete; |
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267 |
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268 virtual ~action_container (void) = default; |
| 15396 | 269 |
| 270 virtual void add (elem *new_elem) = 0; | |
| 271 | |
| 272 // Call to void func (void). | |
| 273 void add_fcn (void (*fcn) (void)) | |
| 274 { | |
| 275 add (new fcn_elem (fcn)); | |
| 276 } | |
| 277 | |
| 278 // Call to void func (T). | |
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279 template <typename T> |
| 15396 | 280 void add_fcn (void (*action) (T), T val) |
| 281 { | |
| 282 add (new fcn_arg_elem<T> (action, val)); | |
| 283 } | |
| 284 | |
| 285 // Call to void func (const T&). | |
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286 template <typename T> |
| 15396 | 287 void add_fcn (void (*action) (const T&), const T& val) |
| 288 { | |
| 289 add (new fcn_crefarg_elem<T> (action, val)); | |
| 290 } | |
| 291 | |
| 292 // Call to T::method (void). | |
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293 template <typename T> |
| 15396 | 294 void add_method (T *obj, void (T::*method) (void)) |
| 295 { | |
| 296 add (new method_elem<T> (obj, method)); | |
| 297 } | |
| 298 | |
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299 template <typename T> |
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300 void add_method (T& obj, void (T::*method) (void)) |
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301 { |
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302 add (new method_elem<T> (obj, method)); |
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303 } |
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304 |
| 15396 | 305 // Call to T::method (A). |
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306 template <typename T, typename A> |
| 15396 | 307 void add_method (T *obj, void (T::*method) (A), A arg) |
| 308 { | |
| 309 add (new method_arg_elem<T, A> (obj, method, arg)); | |
| 310 } | |
| 311 | |
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312 template <typename T, typename A> |
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313 void add_method (T& obj, void (T::*method) (A), A arg) |
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314 { |
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315 add (new method_arg_elem<T, A> (obj, method, arg)); |
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316 } |
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317 |
| 15396 | 318 // Call to T::method (const A&). |
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319 template <typename T, typename A> |
| 15396 | 320 void add_method (T *obj, void (T::*method) (const A&), const A& arg) |
| 321 { | |
| 322 add (new method_crefarg_elem<T, A> (obj, method, arg)); | |
| 323 } | |
| 324 | |
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325 template <typename T, typename A> |
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326 void add_method (T& obj, void (T::*method) (const A&), const A& arg) |
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327 { |
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328 add (new method_crefarg_elem<T, A> (obj, method, arg)); |
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329 } |
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330 |
| 15396 | 331 // Call to delete (T*). |
| 332 | |
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333 template <typename T> |
| 15396 | 334 void add_delete (T *obj) |
| 335 { | |
| 336 add (new delete_ptr_elem<T> (obj)); | |
| 337 } | |
| 338 | |
| 339 // Protect any variable. | |
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340 template <typename T> |
| 15396 | 341 void protect_var (T& var) |
| 342 { | |
| 343 add (new restore_var_elem<T> (var, var)); | |
| 344 } | |
| 345 | |
| 346 // Protect any variable, value given. | |
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347 template <typename T> |
| 15396 | 348 void protect_var (T& var, const T& val) |
| 349 { | |
| 350 add (new restore_var_elem<T> (var, val)); | |
| 351 } | |
| 352 | |
| 353 operator bool (void) const { return ! empty (); } | |
| 354 | |
| 355 virtual void run_first (void) = 0; | |
| 356 | |
| 357 void run (size_t num) | |
| 358 { | |
| 359 if (num > size ()) | |
| 360 num = size (); | |
| 361 | |
| 362 for (size_t i = 0; i < num; i++) | |
| 363 run_first (); | |
| 364 } | |
| 365 | |
| 366 void run (void) { run (size ()); } | |
| 367 | |
| 368 virtual void discard_first (void) = 0; | |
| 369 | |
| 370 void discard (size_t num) | |
| 371 { | |
| 372 if (num > size ()) | |
| 373 num = size (); | |
| 374 | |
| 375 for (size_t i = 0; i < num; i++) | |
| 376 discard_first (); | |
| 377 } | |
| 378 | |
| 379 void discard (void) { discard (size ()); } | |
| 380 | |
| 381 virtual size_t size (void) const = 0; | |
| 382 | |
| 383 bool empty (void) const { return size () == 0; } | |
| 384 }; | |
| 385 | |
| 386 #endif |