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| 1 | // unique_ptr implementation -*- C++ -*- | |
| 2 | ||
| 3 | // Copyright (C) 2008-2015 Free Software Foundation, Inc. | |
| 4 | // | |
| 5 | // This file is part of the GNU ISO C++ Library. This library is free | |
| 6 | // software; you can redistribute it and/or modify it under the | |
| 7 | // terms of the GNU General Public License as published by the | |
| 8 | // Free Software Foundation; either version 3, or (at your option) | |
| 9 | // any later version. | |
| 10 | ||
| 11 | // This library is distributed in the hope that it will be useful, | |
| 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | // GNU General Public License for more details. | |
| 15 | ||
| 16 | // Under Section 7 of GPL version 3, you are granted additional | |
| 17 | // permissions described in the GCC Runtime Library Exception, version | |
| 18 | // 3.1, as published by the Free Software Foundation. | |
| 19 | ||
| 20 | // You should have received a copy of the GNU General Public License and | |
| 21 | // a copy of the GCC Runtime Library Exception along with this program; | |
| 22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 23 | // <http://www.gnu.org/licenses/>. | |
| 24 | ||
| 25 | /** @file bits/unique_ptr.h | |
| 26 | * This is an internal header file, included by other library headers. | |
| 27 | * Do not attempt to use it directly. @headername{memory} | |
| 28 | */ | |
| 29 | ||
| 30 | #ifndef _UNIQUE_PTR_H | |
| 31 | #define _UNIQUE_PTR_H 1 | |
| 32 | ||
| 33 | #include <bits/c++config.h> | |
| 34 | #include <debug/debug.h> | |
| 35 | #include <type_traits> | |
| 36 | #include <utility> | |
| 37 | #include <tuple> | |
| 38 | ||
| 39 | namespace std _GLIBCXX_VISIBILITY(default) | |
| 40 | { | |
| 41 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
| 42 | ||
| 43 | /** | |
| 44 | * @addtogroup pointer_abstractions | |
| 45 | * @{ | |
| 46 | */ | |
| 47 | ||
| 48 | #if _GLIBCXX_USE_DEPRECATED | |
| 49 | template<typename> class auto_ptr; | |
| 50 | #endif | |
| 51 | ||
| 52 | /// Primary template of default_delete, used by unique_ptr | |
| 53 | template<typename _Tp> | |
| 54 | struct default_delete | |
| 55 | { | |
| 56 | /// Default constructor | |
| 57 | constexpr default_delete() noexcept = default; | |
| 58 | ||
| 59 | /** @brief Converting constructor. | |
| 60 | * | |
| 61 | * Allows conversion from a deleter for arrays of another type, @p _Up, | |
| 62 | * only if @p _Up* is convertible to @p _Tp*. | |
| 63 | */ | |
| 64 | template<typename _Up, typename = typename | |
| 65 | enable_if<is_convertible<_Up*, _Tp*>::value>::type> | |
| 66 | default_delete(const default_delete<_Up>&) noexcept { } | |
| 67 | ||
| 68 | /// Calls @c delete @p __ptr | |
| 69 | void | |
| 70 | operator()(_Tp* __ptr) const | |
| 71 | { | |
| 72 | static_assert(!is_void<_Tp>::value, | |
| 73 | "can't delete pointer to incomplete type"); | |
| 74 | static_assert(sizeof(_Tp)>0, | |
| 75 | "can't delete pointer to incomplete type"); | |
| 76 | delete __ptr; | |
| 77 | } | |
| 78 | }; | |
| 79 | ||
| 80 | // _GLIBCXX_RESOLVE_LIB_DEFECTS | |
| 81 | // DR 740 - omit specialization for array objects with a compile time length | |
| 82 | /// Specialization for arrays, default_delete. | |
| 83 | template<typename _Tp> | |
| 84 | struct default_delete<_Tp[]> | |
| 85 | { | |
| 86 | private: | |
| 87 | template<typename _Up> | |
| 88 | using __remove_cv = typename remove_cv<_Up>::type; | |
| 89 | ||
| 90 | // Like is_base_of<_Tp, _Up> but false if unqualified types are the same | |
| 91 | template<typename _Up> | |
| 92 | using __is_derived_Tp | |
| 93 | = __and_< is_base_of<_Tp, _Up>, | |
| 94 | __not_<is_same<__remove_cv<_Tp>, __remove_cv<_Up>>> >; | |
| 95 | ||
| 96 | public: | |
| 97 | /// Default constructor | |
| 98 | constexpr default_delete() noexcept = default; | |
| 99 | ||
| 100 | /** @brief Converting constructor. | |
| 101 | * | |
| 102 | * Allows conversion from a deleter for arrays of another type, such as | |
| 103 | * a const-qualified version of @p _Tp. | |
| 104 | * | |
| 105 | * Conversions from types derived from @c _Tp are not allowed because | |
| 106 | * it is unsafe to @c delete[] an array of derived types through a | |
| 107 | * pointer to the base type. | |
| 108 | */ | |
| 109 | template<typename _Up, typename = typename | |
| 110 | enable_if<!__is_derived_Tp<_Up>::value>::type> | |
| 111 | default_delete(const default_delete<_Up[]>&) noexcept { } | |
| 112 | ||
| 113 | /// Calls @c delete[] @p __ptr | |
| 114 | void | |
| 115 | operator()(_Tp* __ptr) const | |
| 116 | { | |
| 117 | static_assert(sizeof(_Tp)>0, | |
| 118 | "can't delete pointer to incomplete type"); | |
| 119 | delete [] __ptr; | |
| 120 | } | |
| 121 | ||
| 122 | template<typename _Up> | |
| 123 | typename enable_if<__is_derived_Tp<_Up>::value>::type | |
| 124 | operator()(_Up*) const = delete; | |
| 125 | }; | |
| 126 | ||
| 127 | /// 20.7.1.2 unique_ptr for single objects. | |
| 128 | template <typename _Tp, typename _Dp = default_delete<_Tp> > | |
| 129 | class unique_ptr | |
| 130 | { | |
| 131 | // use SFINAE to determine whether _Del::pointer exists | |
| 132 | class _Pointer | |
| 133 | { | |
| 134 | template<typename _Up> | |
| 135 | static typename _Up::pointer __test(typename _Up::pointer*); | |
| 136 | ||
| 137 | template<typename _Up> | |
| 138 | static _Tp* __test(...); | |
| 139 | ||
| 140 | typedef typename remove_reference<_Dp>::type _Del; | |
| 141 | ||
| 142 | public: | |
| 143 | typedef decltype(__test<_Del>(0)) type; | |
| 144 | }; | |
| 145 | ||
| 146 | typedef std::tuple<typename _Pointer::type, _Dp> __tuple_type; | |
| 147 | __tuple_type _M_t; | |
| 148 | ||
| 149 | public: | |
| 150 | typedef typename _Pointer::type pointer; | |
| 151 | typedef _Tp element_type; | |
| 152 | typedef _Dp deleter_type; | |
| 153 | ||
| 154 | // Constructors. | |
| 155 | ||
| 156 | /// Default constructor, creates a unique_ptr that owns nothing. | |
| 157 | constexpr unique_ptr() noexcept | |
| 158 | : _M_t() | |
| 159 | { static_assert(!is_pointer<deleter_type>::value, | |
| 160 | "constructed with null function pointer deleter"); } | |
| 161 | ||
| 162 | /** Takes ownership of a pointer. | |
| 163 | * | |
| 164 | * @param __p A pointer to an object of @c element_type | |
| 165 | * | |
| 166 | * The deleter will be value-initialized. | |
| 167 | */ | |
| 168 | explicit | |
| 169 | unique_ptr(pointer __p) noexcept | |
| 170 | : _M_t(__p, deleter_type()) | |
| 171 | { static_assert(!is_pointer<deleter_type>::value, | |
| 172 | "constructed with null function pointer deleter"); } | |
| 173 | ||
| 174 | /** Takes ownership of a pointer. | |
| 175 | * | |
| 176 | * @param __p A pointer to an object of @c element_type | |
| 177 | * @param __d A reference to a deleter. | |
| 178 | * | |
| 179 | * The deleter will be initialized with @p __d | |
| 180 | */ | |
| 181 | unique_ptr(pointer __p, | |
| 182 | typename conditional<is_reference<deleter_type>::value, | |
| 183 | deleter_type, const deleter_type&>::type __d) noexcept | |
| 184 | : _M_t(__p, __d) { } | |
| 185 | ||
| 186 | /** Takes ownership of a pointer. | |
| 187 | * | |
| 188 | * @param __p A pointer to an object of @c element_type | |
| 189 | * @param __d An rvalue reference to a deleter. | |
| 190 | * | |
| 191 | * The deleter will be initialized with @p std::move(__d) | |
| 192 | */ | |
| 193 | unique_ptr(pointer __p, | |
| 194 | typename remove_reference<deleter_type>::type&& __d) noexcept | |
| 195 | : _M_t(std::move(__p), std::move(__d)) | |
| 196 | { static_assert(!std::is_reference<deleter_type>::value, | |
| 197 | "rvalue deleter bound to reference"); } | |
| 198 | ||
| 199 | /// Creates a unique_ptr that owns nothing. | |
| 200 | constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { } | |
| 201 | ||
| 202 | // Move constructors. | |
| 203 | ||
| 204 | /// Move constructor. | |
| 205 | unique_ptr(unique_ptr&& __u) noexcept | |
| 206 | : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { } | |
| 207 | ||
| 208 | /** @brief Converting constructor from another type | |
| 209 | * | |
| 210 | * Requires that the pointer owned by @p __u is convertible to the | |
| 211 | * type of pointer owned by this object, @p __u does not own an array, | |
| 212 | * and @p __u has a compatible deleter type. | |
| 213 | */ | |
| 214 | template<typename _Up, typename _Ep, typename = _Require< | |
| 215 | is_convertible<typename unique_ptr<_Up, _Ep>::pointer, pointer>, | |
| 216 | __not_<is_array<_Up>>, | |
| 217 | typename conditional<is_reference<_Dp>::value, | |
| 218 | is_same<_Ep, _Dp>, | |
| 219 | is_convertible<_Ep, _Dp>>::type>> | |
| 220 | unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept | |
| 221 | : _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter())) | |
| 222 | { } | |
| 223 | ||
| 224 | #if _GLIBCXX_USE_DEPRECATED | |
| 225 | /// Converting constructor from @c auto_ptr | |
| 226 | template<typename _Up, typename = _Require< | |
| 227 | is_convertible<_Up*, _Tp*>, is_same<_Dp, default_delete<_Tp>>>> | |
| 228 | unique_ptr(auto_ptr<_Up>&& __u) noexcept; | |
| 229 | #endif | |
| 230 | ||
| 231 | /// Destructor, invokes the deleter if the stored pointer is not null. | |
| 232 | ~unique_ptr() noexcept | |
| 233 | { | |
| 234 | auto& __ptr = std::get<0>(_M_t); | |
| 235 | if (__ptr != nullptr) | |
| 236 | get_deleter()(__ptr); | |
| 237 | __ptr = pointer(); | |
| 238 | } | |
| 239 | ||
| 240 | // Assignment. | |
| 241 | ||
| 242 | /** @brief Move assignment operator. | |
| 243 | * | |
| 244 | * @param __u The object to transfer ownership from. | |
| 245 | * | |
| 246 | * Invokes the deleter first if this object owns a pointer. | |
| 247 | */ | |
| 248 | unique_ptr& | |
| 249 | operator=(unique_ptr&& __u) noexcept | |
| 250 | { | |
| 251 | reset(__u.release()); | |
| 252 | get_deleter() = std::forward<deleter_type>(__u.get_deleter()); | |
| 253 | return *this; | |
| 254 | } | |
| 255 | ||
| 256 | /** @brief Assignment from another type. | |
| 257 | * | |
| 258 | * @param __u The object to transfer ownership from, which owns a | |
| 259 | * convertible pointer to a non-array object. | |
| 260 | * | |
| 261 | * Invokes the deleter first if this object owns a pointer. | |
| 262 | */ | |
| 263 | template<typename _Up, typename _Ep> | |
| 264 | typename enable_if< __and_< | |
| 265 | is_convertible<typename unique_ptr<_Up, _Ep>::pointer, pointer>, | |
| 266 | __not_<is_array<_Up>> | |
| 267 | >::value, | |
| 268 | unique_ptr&>::type | |
| 269 | operator=(unique_ptr<_Up, _Ep>&& __u) noexcept | |
| 270 | { | |
| 271 | reset(__u.release()); | |
| 272 | get_deleter() = std::forward<_Ep>(__u.get_deleter()); | |
| 273 | return *this; | |
| 274 | } | |
| 275 | ||
| 276 | /// Reset the %unique_ptr to empty, invoking the deleter if necessary. | |
| 277 | unique_ptr& | |
| 278 | operator=(nullptr_t) noexcept | |
| 279 | { | |
| 280 | reset(); | |
| 281 | return *this; | |
| 282 | } | |
| 283 | ||
| 284 | // Observers. | |
| 285 | ||
| 286 | /// Dereference the stored pointer. | |
| 287 | typename add_lvalue_reference<element_type>::type | |
| 288 | operator*() const | |
| 289 | { | |
| 290 | _GLIBCXX_DEBUG_ASSERT(get() != pointer()); | |
| 291 | return *get(); | |
| 292 | } | |
| 293 | ||
| 294 | /// Return the stored pointer. | |
| 295 | pointer | |
| 296 | operator->() const noexcept | |
| 297 | { | |
| 298 | _GLIBCXX_DEBUG_ASSERT(get() != pointer()); | |
| 299 | return get(); | |
| 300 | } | |
| 301 | ||
| 302 | /// Return the stored pointer. | |
| 303 | pointer | |
| 304 | get() const noexcept | |
| 305 | { return std::get<0>(_M_t); } | |
| 306 | ||
| 307 | /// Return a reference to the stored deleter. | |
| 308 | deleter_type& | |
| 309 | get_deleter() noexcept | |
| 310 | { return std::get<1>(_M_t); } | |
| 311 | ||
| 312 | /// Return a reference to the stored deleter. | |
| 313 | const deleter_type& | |
| 314 | get_deleter() const noexcept | |
| 315 | { return std::get<1>(_M_t); } | |
| 316 | ||
| 317 | /// Return @c true if the stored pointer is not null. | |
| 318 | explicit operator bool() const noexcept | |
| 319 | { return get() == pointer() ? false : true; } | |
| 320 | ||
| 321 | // Modifiers. | |
| 322 | ||
| 323 | /// Release ownership of any stored pointer. | |
| 324 | pointer | |
| 325 | release() noexcept | |
| 326 | { | |
| 327 | pointer __p = get(); | |
| 328 | std::get<0>(_M_t) = pointer(); | |
| 329 | return __p; | |
| 330 | } | |
| 331 | ||
| 332 | /** @brief Replace the stored pointer. | |
| 333 | * | |
| 334 | * @param __p The new pointer to store. | |
| 335 | * | |
| 336 | * The deleter will be invoked if a pointer is already owned. | |
| 337 | */ | |
| 338 | void | |
| 339 | reset(pointer __p = pointer()) noexcept | |
| 340 | { | |
| 341 | using std::swap; | |
| 342 | swap(std::get<0>(_M_t), __p); | |
| 343 | if (__p != pointer()) | |
| 344 | get_deleter()(__p); | |
| 345 | } | |
| 346 | ||
| 347 | /// Exchange the pointer and deleter with another object. | |
| 348 | void | |
| 349 | swap(unique_ptr& __u) noexcept | |
| 350 | { | |
| 351 | using std::swap; | |
| 352 | swap(_M_t, __u._M_t); | |
| 353 | } | |
| 354 | ||
| 355 | // Disable copy from lvalue. | |
| 356 | unique_ptr(const unique_ptr&) = delete; | |
| 357 | unique_ptr& operator=(const unique_ptr&) = delete; | |
| 358 | }; | |
| 359 | ||
| 360 | /// 20.7.1.3 unique_ptr for array objects with a runtime length | |
| 361 | // [unique.ptr.runtime] | |
| 362 | // _GLIBCXX_RESOLVE_LIB_DEFECTS | |
| 363 | // DR 740 - omit specialization for array objects with a compile time length | |
| 364 | template<typename _Tp, typename _Dp> | |
| 365 | class unique_ptr<_Tp[], _Dp> | |
| 366 | { | |
| 367 | // use SFINAE to determine whether _Del::pointer exists | |
| 368 | class _Pointer | |
| 369 | { | |
| 370 | template<typename _Up> | |
| 371 | static typename _Up::pointer __test(typename _Up::pointer*); | |
| 372 | ||
| 373 | template<typename _Up> | |
| 374 | static _Tp* __test(...); | |
| 375 | ||
| 376 | typedef typename remove_reference<_Dp>::type _Del; | |
| 377 | ||
| 378 | public: | |
| 379 | typedef decltype(__test<_Del>(0)) type; | |
| 380 | }; | |
| 381 | ||
| 382 | typedef std::tuple<typename _Pointer::type, _Dp> __tuple_type; | |
| 383 | __tuple_type _M_t; | |
| 384 | ||
| 385 | template<typename _Up> | |
| 386 | using __remove_cv = typename remove_cv<_Up>::type; | |
| 387 | ||
| 388 | // like is_base_of<_Tp, _Up> but false if unqualified types are the same | |
| 389 | template<typename _Up> | |
| 390 | using __is_derived_Tp | |
| 391 | = __and_< is_base_of<_Tp, _Up>, | |
| 392 | __not_<is_same<__remove_cv<_Tp>, __remove_cv<_Up>>> >; | |
| 393 | ||
| 394 | template<typename _Up, typename _Ep, | |
| 395 | typename _Tp_pointer = typename _Pointer::type, | |
| 396 | typename _Up_pointer = typename unique_ptr<_Up, _Ep>::pointer> | |
| 397 | using __safe_conversion = __and_< | |
| 398 | is_convertible<_Up_pointer, _Tp_pointer>, | |
| 399 | is_array<_Up>, | |
| 400 | __or_<__not_<is_pointer<_Up_pointer>>, | |
| 401 | __not_<is_pointer<_Tp_pointer>>, | |
| 402 | __not_<__is_derived_Tp<typename remove_extent<_Up>::type>> | |
| 403 | > | |
| 404 | >; | |
| 405 | ||
| 406 | public: | |
| 407 | typedef typename _Pointer::type pointer; | |
| 408 | typedef _Tp element_type; | |
| 409 | typedef _Dp deleter_type; | |
| 410 | ||
| 411 | // Constructors. | |
| 412 | ||
| 413 | /// Default constructor, creates a unique_ptr that owns nothing. | |
| 414 | constexpr unique_ptr() noexcept | |
| 415 | : _M_t() | |
| 416 | { static_assert(!std::is_pointer<deleter_type>::value, | |
| 417 | "constructed with null function pointer deleter"); } | |
| 418 | ||
| 419 | /** Takes ownership of a pointer. | |
| 420 | * | |
| 421 | * @param __p A pointer to an array of @c element_type | |
| 422 | * | |
| 423 | * The deleter will be value-initialized. | |
| 424 | */ | |
| 425 | explicit | |
| 426 | unique_ptr(pointer __p) noexcept | |
| 427 | : _M_t(__p, deleter_type()) | |
| 428 | { static_assert(!is_pointer<deleter_type>::value, | |
| 429 | "constructed with null function pointer deleter"); } | |
| 430 | ||
| 431 | // Disable construction from convertible pointer types. | |
| 432 | template<typename _Up, typename = _Require<is_pointer<pointer>, | |
| 433 | is_convertible<_Up*, pointer>, __is_derived_Tp<_Up>>> | |
| 434 | explicit | |
| 435 | unique_ptr(_Up* __p) = delete; | |
| 436 | ||
| 437 | /** Takes ownership of a pointer. | |
| 438 | * | |
| 439 | * @param __p A pointer to an array of @c element_type | |
| 440 | * @param __d A reference to a deleter. | |
| 441 | * | |
| 442 | * The deleter will be initialized with @p __d | |
| 443 | */ | |
| 444 | unique_ptr(pointer __p, | |
| 445 | typename conditional<is_reference<deleter_type>::value, | |
| 446 | deleter_type, const deleter_type&>::type __d) noexcept | |
| 447 | : _M_t(__p, __d) { } | |
| 448 | ||
| 449 | /** Takes ownership of a pointer. | |
| 450 | * | |
| 451 | * @param __p A pointer to an array of @c element_type | |
| 452 | * @param __d A reference to a deleter. | |
| 453 | * | |
| 454 | * The deleter will be initialized with @p std::move(__d) | |
| 455 | */ | |
| 456 | unique_ptr(pointer __p, typename | |
| 457 | remove_reference<deleter_type>::type&& __d) noexcept | |
| 458 | : _M_t(std::move(__p), std::move(__d)) | |
| 459 | { static_assert(!is_reference<deleter_type>::value, | |
| 460 | "rvalue deleter bound to reference"); } | |
| 461 | ||
| 462 | /// Move constructor. | |
| 463 | unique_ptr(unique_ptr&& __u) noexcept | |
| 464 | : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { } | |
| 465 | ||
| 466 | /// Creates a unique_ptr that owns nothing. | |
| 467 | constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { } | |
| 468 | ||
| 469 | template<typename _Up, typename _Ep, | |
| 470 | typename = _Require<__safe_conversion<_Up, _Ep>, | |
| 471 | typename conditional<is_reference<_Dp>::value, | |
| 472 | is_same<_Ep, _Dp>, | |
| 473 | is_convertible<_Ep, _Dp>>::type | |
| 474 | >> | |
| 475 | unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept | |
| 476 | : _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter())) | |
| 477 | { } | |
| 478 | ||
| 479 | /// Destructor, invokes the deleter if the stored pointer is not null. | |
| 480 | ~unique_ptr() | |
| 481 | { | |
| 482 | auto& __ptr = std::get<0>(_M_t); | |
| 483 | if (__ptr != nullptr) | |
| 484 | get_deleter()(__ptr); | |
| 485 | __ptr = pointer(); | |
| 486 | } | |
| 487 | ||
| 488 | // Assignment. | |
| 489 | ||
| 490 | /** @brief Move assignment operator. | |
| 491 | * | |
| 492 | * @param __u The object to transfer ownership from. | |
| 493 | * | |
| 494 | * Invokes the deleter first if this object owns a pointer. | |
| 495 | */ | |
| 496 | unique_ptr& | |
| 497 | operator=(unique_ptr&& __u) noexcept | |
| 498 | { | |
| 499 | reset(__u.release()); | |
| 500 | get_deleter() = std::forward<deleter_type>(__u.get_deleter()); | |
| 501 | return *this; | |
| 502 | } | |
| 503 | ||
| 504 | /** @brief Assignment from another type. | |
| 505 | * | |
| 506 | * @param __u The object to transfer ownership from, which owns a | |
| 507 | * convertible pointer to an array object. | |
| 508 | * | |
| 509 | * Invokes the deleter first if this object owns a pointer. | |
| 510 | */ | |
| 511 | template<typename _Up, typename _Ep> | |
| 512 | typename | |
| 513 | enable_if<__safe_conversion<_Up, _Ep>::value, unique_ptr&>::type | |
| 514 | operator=(unique_ptr<_Up, _Ep>&& __u) noexcept | |
| 515 | { | |
| 516 | reset(__u.release()); | |
| 517 | get_deleter() = std::forward<_Ep>(__u.get_deleter()); | |
| 518 | return *this; | |
| 519 | } | |
| 520 | ||
| 521 | /// Reset the %unique_ptr to empty, invoking the deleter if necessary. | |
| 522 | unique_ptr& | |
| 523 | operator=(nullptr_t) noexcept | |
| 524 | { | |
| 525 | reset(); | |
| 526 | return *this; | |
| 527 | } | |
| 528 | ||
| 529 | // Observers. | |
| 530 | ||
| 531 | /// Access an element of owned array. | |
| 532 | typename std::add_lvalue_reference<element_type>::type | |
| 533 | operator[](size_t __i) const | |
| 534 | { | |
| 535 | _GLIBCXX_DEBUG_ASSERT(get() != pointer()); | |
| 536 | return get()[__i]; | |
| 537 | } | |
| 538 | ||
| 539 | /// Return the stored pointer. | |
| 540 | pointer | |
| 541 | get() const noexcept | |
| 542 | { return std::get<0>(_M_t); } | |
| 543 | ||
| 544 | /// Return a reference to the stored deleter. | |
| 545 | deleter_type& | |
| 546 | get_deleter() noexcept | |
| 547 | { return std::get<1>(_M_t); } | |
| 548 | ||
| 549 | /// Return a reference to the stored deleter. | |
| 550 | const deleter_type& | |
| 551 | get_deleter() const noexcept | |
| 552 | { return std::get<1>(_M_t); } | |
| 553 | ||
| 554 | /// Return @c true if the stored pointer is not null. | |
| 555 | explicit operator bool() const noexcept | |
| 556 | { return get() == pointer() ? false : true; } | |
| 557 | ||
| 558 | // Modifiers. | |
| 559 | ||
| 560 | /// Release ownership of any stored pointer. | |
| 561 | pointer | |
| 562 | release() noexcept | |
| 563 | { | |
| 564 | pointer __p = get(); | |
| 565 | std::get<0>(_M_t) = pointer(); | |
| 566 | return __p; | |
| 567 | } | |
| 568 | ||
| 569 | /** @brief Replace the stored pointer. | |
| 570 | * | |
| 571 | * @param __p The new pointer to store. | |
| 572 | * | |
| 573 | * The deleter will be invoked if a pointer is already owned. | |
| 574 | */ | |
| 575 | void | |
| 576 | reset(pointer __p = pointer()) noexcept | |
| 577 | { | |
| 578 | using std::swap; | |
| 579 | swap(std::get<0>(_M_t), __p); | |
| 580 | if (__p != nullptr) | |
| 581 | get_deleter()(__p); | |
| 582 | } | |
| 583 | ||
| 584 | // Disable resetting from convertible pointer types. | |
| 585 | template<typename _Up, typename = _Require<is_pointer<pointer>, | |
| 586 | is_convertible<_Up*, pointer>, __is_derived_Tp<_Up>>> | |
| 587 | void reset(_Up*) = delete; | |
| 588 | ||
| 589 | /// Exchange the pointer and deleter with another object. | |
| 590 | void | |
| 591 | swap(unique_ptr& __u) noexcept | |
| 592 | { | |
| 593 | using std::swap; | |
| 594 | swap(_M_t, __u._M_t); | |
| 595 | } | |
| 596 | ||
| 597 | // Disable copy from lvalue. | |
| 598 | unique_ptr(const unique_ptr&) = delete; | |
| 599 | unique_ptr& operator=(const unique_ptr&) = delete; | |
| 600 | ||
| 601 | // Disable construction from convertible pointer types. | |
| 602 | template<typename _Up, typename = _Require<is_pointer<pointer>, | |
| 603 | is_convertible<_Up*, pointer>, __is_derived_Tp<_Up>>> | |
| 604 | unique_ptr(_Up*, typename | |
| 605 | conditional<is_reference<deleter_type>::value, | |
| 606 | deleter_type, const deleter_type&>::type) = delete; | |
| 607 | ||
| 608 | // Disable construction from convertible pointer types. | |
| 609 | template<typename _Up, typename = _Require<is_pointer<pointer>, | |
| 610 | is_convertible<_Up*, pointer>, __is_derived_Tp<_Up>>> | |
| 611 | unique_ptr(_Up*, typename | |
| 612 | remove_reference<deleter_type>::type&&) = delete; | |
| 613 | }; | |
| 614 | ||
| 615 | template<typename _Tp, typename _Dp> | |
| 616 | inline void | |
| 617 | swap(unique_ptr<_Tp, _Dp>& __x, | |
| 618 | unique_ptr<_Tp, _Dp>& __y) noexcept | |
| 619 | { __x.swap(__y); } | |
| 620 | ||
| 621 | template<typename _Tp, typename _Dp, | |
| 622 | typename _Up, typename _Ep> | |
| 623 | inline bool | |
| 624 | operator==(const unique_ptr<_Tp, _Dp>& __x, | |
| 625 | const unique_ptr<_Up, _Ep>& __y) | |
| 626 | { return __x.get() == __y.get(); } | |
| 627 | ||
| 628 | template<typename _Tp, typename _Dp> | |
| 629 | inline bool | |
| 630 | operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept | |
| 631 | { return !__x; } | |
| 632 | ||
| 633 | template<typename _Tp, typename _Dp> | |
| 634 | inline bool | |
| 635 | operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept | |
| 636 | { return !__x; } | |
| 637 | ||
| 638 | template<typename _Tp, typename _Dp, | |
| 639 | typename _Up, typename _Ep> | |
| 640 | inline bool | |
| 641 | operator!=(const unique_ptr<_Tp, _Dp>& __x, | |
| 642 | const unique_ptr<_Up, _Ep>& __y) | |
| 643 | { return __x.get() != __y.get(); } | |
| 644 | ||
| 645 | template<typename _Tp, typename _Dp> | |
| 646 | inline bool | |
| 647 | operator!=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept | |
| 648 | { return (bool)__x; } | |
| 649 | ||
| 650 | template<typename _Tp, typename _Dp> | |
| 651 | inline bool | |
| 652 | operator!=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept | |
| 653 | { return (bool)__x; } | |
| 654 | ||
| 655 | template<typename _Tp, typename _Dp, | |
| 656 | typename _Up, typename _Ep> | |
| 657 | inline bool | |
| 658 | operator<(const unique_ptr<_Tp, _Dp>& __x, | |
| 659 | const unique_ptr<_Up, _Ep>& __y) | |
| 660 | { | |
| 661 | typedef typename | |
| 662 | std::common_type<typename unique_ptr<_Tp, _Dp>::pointer, | |
| 663 | typename unique_ptr<_Up, _Ep>::pointer>::type _CT; | |
| 664 | return std::less<_CT>()(__x.get(), __y.get()); | |
| 665 | } | |
| 666 | ||
| 667 | template<typename _Tp, typename _Dp> | |
| 668 | inline bool | |
| 669 | operator<(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) | |
| 670 | { return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(__x.get(), | |
| 671 | nullptr); } | |
| 672 | ||
| 673 | template<typename _Tp, typename _Dp> | |
| 674 | inline bool | |
| 675 | operator<(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) | |
| 676 | { return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(nullptr, | |
| 677 | __x.get()); } | |
| 678 | ||
| 679 | template<typename _Tp, typename _Dp, | |
| 680 | typename _Up, typename _Ep> | |
| 681 | inline bool | |
| 682 | operator<=(const unique_ptr<_Tp, _Dp>& __x, | |
| 683 | const unique_ptr<_Up, _Ep>& __y) | |
| 684 | { return !(__y < __x); } | |
| 685 | ||
| 686 | template<typename _Tp, typename _Dp> | |
| 687 | inline bool | |
| 688 | operator<=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) | |
| 689 | { return !(nullptr < __x); } | |
| 690 | ||
| 691 | template<typename _Tp, typename _Dp> | |
| 692 | inline bool | |
| 693 | operator<=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) | |
| 694 | { return !(__x < nullptr); } | |
| 695 | ||
| 696 | template<typename _Tp, typename _Dp, | |
| 697 | typename _Up, typename _Ep> | |
| 698 | inline bool | |
| 699 | operator>(const unique_ptr<_Tp, _Dp>& __x, | |
| 700 | const unique_ptr<_Up, _Ep>& __y) | |
| 701 | { return (__y < __x); } | |
| 702 | ||
| 703 | template<typename _Tp, typename _Dp> | |
| 704 | inline bool | |
| 705 | operator>(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) | |
| 706 | { return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(nullptr, | |
| 707 | __x.get()); } | |
| 708 | ||
| 709 | template<typename _Tp, typename _Dp> | |
| 710 | inline bool | |
| 711 | operator>(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) | |
| 712 | { return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(__x.get(), | |
| 713 | nullptr); } | |
| 714 | ||
| 715 | template<typename _Tp, typename _Dp, | |
| 716 | typename _Up, typename _Ep> | |
| 717 | inline bool | |
| 718 | operator>=(const unique_ptr<_Tp, _Dp>& __x, | |
| 719 | const unique_ptr<_Up, _Ep>& __y) | |
| 720 | { return !(__x < __y); } | |
| 721 | ||
| 722 | template<typename _Tp, typename _Dp> | |
| 723 | inline bool | |
| 724 | operator>=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) | |
| 725 | { return !(__x < nullptr); } | |
| 726 | ||
| 727 | template<typename _Tp, typename _Dp> | |
| 728 | inline bool | |
| 729 | operator>=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) | |
| 730 | { return !(nullptr < __x); } | |
| 731 | ||
| 732 | /// std::hash specialization for unique_ptr. | |
| 733 | template<typename _Tp, typename _Dp> | |
| 734 | struct hash<unique_ptr<_Tp, _Dp>> | |
| 735 | : public __hash_base<size_t, unique_ptr<_Tp, _Dp>> | |
| 736 | { | |
| 737 | size_t | |
| 738 | operator()(const unique_ptr<_Tp, _Dp>& __u) const noexcept | |
| 739 | { | |
| 740 | typedef unique_ptr<_Tp, _Dp> _UP; | |
| 741 | return std::hash<typename _UP::pointer>()(__u.get()); | |
| 742 | } | |
| 743 | }; | |
| 744 | ||
| 745 | #if __cplusplus > 201103L | |
| 746 | ||
| 747 | #define __cpp_lib_make_unique 201304 | |
| 748 | ||
| 749 | template<typename _Tp> | |
| 750 | struct _MakeUniq | |
| 751 | { typedef unique_ptr<_Tp> __single_object; }; | |
| 752 | ||
| 753 | template<typename _Tp> | |
| 754 | struct _MakeUniq<_Tp[]> | |
| 755 | { typedef unique_ptr<_Tp[]> __array; }; | |
| 756 | ||
| 757 | template<typename _Tp, size_t _Bound> | |
| 758 | struct _MakeUniq<_Tp[_Bound]> | |
| 759 | { struct __invalid_type { }; }; | |
| 760 | ||
| 761 | /// std::make_unique for single objects | |
| 762 | template<typename _Tp, typename... _Args> | |
| 763 | inline typename _MakeUniq<_Tp>::__single_object | |
| 764 | make_unique(_Args&&... __args) | |
| 765 | { return unique_ptr<_Tp>(new _Tp(std::forward<_Args>(__args)...)); } | |
| 766 | ||
| 767 | /// std::make_unique for arrays of unknown bound | |
| 768 | template<typename _Tp> | |
| 769 | inline typename _MakeUniq<_Tp>::__array | |
| 770 | make_unique(size_t __num) | |
| 771 | { return unique_ptr<_Tp>(new remove_extent_t<_Tp>[__num]()); } | |
| 772 | ||
| 773 | /// Disable std::make_unique for arrays of known bound | |
| 774 | template<typename _Tp, typename... _Args> | |
| 775 | inline typename _MakeUniq<_Tp>::__invalid_type | |
| 776 | make_unique(_Args&&...) = delete; | |
| 777 | #endif | |
| 778 | ||
| 779 | // @} group pointer_abstractions | |
| 780 | ||
| 781 | _GLIBCXX_END_NAMESPACE_VERSION | |
| 782 | } // namespace | |
| 783 | ||
| 784 | #endif /* _UNIQUE_PTR_H */ | |
| 785 |
Copyright (c) 2006-2012 Rogue Wave Software, Inc. All Rights Reserved.
Patents pending.