Yi Kong | 878f994 | 2023-12-13 12:55:04 +0900 | [diff] [blame^] | 1 | // -*- C++ -*- |
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP_OPTIONAL |
| 11 | #define _LIBCPP_OPTIONAL |
| 12 | |
| 13 | /* |
| 14 | optional synopsis |
| 15 | |
| 16 | // C++1z |
| 17 | |
| 18 | namespace std { |
| 19 | // [optional.optional], class template optional |
| 20 | template <class T> |
| 21 | class optional; |
| 22 | |
| 23 | template<class T> |
| 24 | concept is-derived-from-optional = requires(const T& t) { // exposition only |
| 25 | []<class U>(const optional<U>&){ }(t); |
| 26 | }; |
| 27 | |
| 28 | // [optional.nullopt], no-value state indicator |
| 29 | struct nullopt_t{see below }; |
| 30 | inline constexpr nullopt_t nullopt(unspecified ); |
| 31 | |
| 32 | // [optional.bad.access], class bad_optional_access |
| 33 | class bad_optional_access; |
| 34 | |
| 35 | // [optional.relops], relational operators |
| 36 | template <class T, class U> |
| 37 | constexpr bool operator==(const optional<T>&, const optional<U>&); |
| 38 | template <class T, class U> |
| 39 | constexpr bool operator!=(const optional<T>&, const optional<U>&); |
| 40 | template <class T, class U> |
| 41 | constexpr bool operator<(const optional<T>&, const optional<U>&); |
| 42 | template <class T, class U> |
| 43 | constexpr bool operator>(const optional<T>&, const optional<U>&); |
| 44 | template <class T, class U> |
| 45 | constexpr bool operator<=(const optional<T>&, const optional<U>&); |
| 46 | template <class T, class U> |
| 47 | constexpr bool operator>=(const optional<T>&, const optional<U>&); |
| 48 | template<class T, three_way_comparable_with<T> U> |
| 49 | constexpr compare_three_way_result_t<T, U> |
| 50 | operator<=>(const optional<T>&, const optional<U>&); // since C++20 |
| 51 | |
| 52 | // [optional.nullops], comparison with nullopt |
| 53 | template<class T> constexpr bool operator==(const optional<T>&, nullopt_t) noexcept; |
| 54 | template<class T> constexpr bool operator==(nullopt_t, const optional<T>&) noexcept; // until C++17 |
| 55 | template<class T> constexpr bool operator!=(const optional<T>&, nullopt_t) noexcept; // until C++17 |
| 56 | template<class T> constexpr bool operator!=(nullopt_t, const optional<T>&) noexcept; // until C++17 |
| 57 | template<class T> constexpr bool operator<(const optional<T>&, nullopt_t) noexcept; // until C++17 |
| 58 | template<class T> constexpr bool operator<(nullopt_t, const optional<T>&) noexcept; // until C++17 |
| 59 | template<class T> constexpr bool operator<=(const optional<T>&, nullopt_t) noexcept; // until C++17 |
| 60 | template<class T> constexpr bool operator<=(nullopt_t, const optional<T>&) noexcept; // until C++17 |
| 61 | template<class T> constexpr bool operator>(const optional<T>&, nullopt_t) noexcept; // until C++17 |
| 62 | template<class T> constexpr bool operator>(nullopt_t, const optional<T>&) noexcept; // until C++17 |
| 63 | template<class T> constexpr bool operator>=(const optional<T>&, nullopt_t) noexcept; // until C++17 |
| 64 | template<class T> constexpr bool operator>=(nullopt_t, const optional<T>&) noexcept; // until C++17 |
| 65 | template<class T> |
| 66 | constexpr strong_ordering operator<=>(const optional<T>&, nullopt_t) noexcept; // since C++20 |
| 67 | |
| 68 | // [optional.comp.with.t], comparison with T |
| 69 | template<class T, class U> constexpr bool operator==(const optional<T>&, const U&); |
| 70 | template<class T, class U> constexpr bool operator==(const T&, const optional<U>&); |
| 71 | template<class T, class U> constexpr bool operator!=(const optional<T>&, const U&); |
| 72 | template<class T, class U> constexpr bool operator!=(const T&, const optional<U>&); |
| 73 | template<class T, class U> constexpr bool operator<(const optional<T>&, const U&); |
| 74 | template<class T, class U> constexpr bool operator<(const T&, const optional<U>&); |
| 75 | template<class T, class U> constexpr bool operator<=(const optional<T>&, const U&); |
| 76 | template<class T, class U> constexpr bool operator<=(const T&, const optional<U>&); |
| 77 | template<class T, class U> constexpr bool operator>(const optional<T>&, const U&); |
| 78 | template<class T, class U> constexpr bool operator>(const T&, const optional<U>&); |
| 79 | template<class T, class U> constexpr bool operator>=(const optional<T>&, const U&); |
| 80 | template<class T, class U> constexpr bool operator>=(const T&, const optional<U>&); |
| 81 | template<class T, class U> |
| 82 | requires (!is-derived-from-optional<U>) && three_way_comparable_with<T, U> |
| 83 | constexpr compare_three_way_result_t<T, U> |
| 84 | operator<=>(const optional<T>&, const U&); // since C++20 |
| 85 | |
| 86 | // [optional.specalg], specialized algorithms |
| 87 | template<class T> |
| 88 | void swap(optional<T>&, optional<T>&) noexcept(see below ); // constexpr in C++20 |
| 89 | |
| 90 | template<class T> |
| 91 | constexpr optional<see below > make_optional(T&&); |
| 92 | template<class T, class... Args> |
| 93 | constexpr optional<T> make_optional(Args&&... args); |
| 94 | template<class T, class U, class... Args> |
| 95 | constexpr optional<T> make_optional(initializer_list<U> il, Args&&... args); |
| 96 | |
| 97 | // [optional.hash], hash support |
| 98 | template<class T> struct hash; |
| 99 | template<class T> struct hash<optional<T>>; |
| 100 | |
| 101 | template<class T> |
| 102 | class optional { |
| 103 | public: |
| 104 | using value_type = T; |
| 105 | |
| 106 | // [optional.ctor], constructors |
| 107 | constexpr optional() noexcept; |
| 108 | constexpr optional(nullopt_t) noexcept; |
| 109 | constexpr optional(const optional &); |
| 110 | constexpr optional(optional &&) noexcept(see below); |
| 111 | template<class... Args> |
| 112 | constexpr explicit optional(in_place_t, Args &&...); |
| 113 | template<class U, class... Args> |
| 114 | constexpr explicit optional(in_place_t, initializer_list<U>, Args &&...); |
| 115 | template<class U = T> |
| 116 | constexpr explicit(see-below) optional(U &&); |
| 117 | template<class U> |
| 118 | explicit(see-below) optional(const optional<U> &); // constexpr in C++20 |
| 119 | template<class U> |
| 120 | explicit(see-below) optional(optional<U> &&); // constexpr in C++20 |
| 121 | |
| 122 | // [optional.dtor], destructor |
| 123 | ~optional(); // constexpr in C++20 |
| 124 | |
| 125 | // [optional.assign], assignment |
| 126 | optional &operator=(nullopt_t) noexcept; // constexpr in C++20 |
| 127 | constexpr optional &operator=(const optional &); |
| 128 | constexpr optional &operator=(optional &&) noexcept(see below); |
| 129 | template<class U = T> optional &operator=(U &&); // constexpr in C++20 |
| 130 | template<class U> optional &operator=(const optional<U> &); // constexpr in C++20 |
| 131 | template<class U> optional &operator=(optional<U> &&); // constexpr in C++20 |
| 132 | template<class... Args> T& emplace(Args &&...); // constexpr in C++20 |
| 133 | template<class U, class... Args> T& emplace(initializer_list<U>, Args &&...); // constexpr in C++20 |
| 134 | |
| 135 | // [optional.swap], swap |
| 136 | void swap(optional &) noexcept(see below ); // constexpr in C++20 |
| 137 | |
| 138 | // [optional.observe], observers |
| 139 | constexpr T const *operator->() const; |
| 140 | constexpr T *operator->(); |
| 141 | constexpr T const &operator*() const &; |
| 142 | constexpr T &operator*() &; |
| 143 | constexpr T &&operator*() &&; |
| 144 | constexpr const T &&operator*() const &&; |
| 145 | constexpr explicit operator bool() const noexcept; |
| 146 | constexpr bool has_value() const noexcept; |
| 147 | constexpr T const &value() const &; |
| 148 | constexpr T &value() &; |
| 149 | constexpr T &&value() &&; |
| 150 | constexpr const T &&value() const &&; |
| 151 | template<class U> constexpr T value_or(U &&) const &; |
| 152 | template<class U> constexpr T value_or(U &&) &&; |
| 153 | |
| 154 | // [optional.monadic], monadic operations |
| 155 | template<class F> constexpr auto and_then(F&& f) &; // since C++23 |
| 156 | template<class F> constexpr auto and_then(F&& f) &&; // since C++23 |
| 157 | template<class F> constexpr auto and_then(F&& f) const&; // since C++23 |
| 158 | template<class F> constexpr auto and_then(F&& f) const&&; // since C++23 |
| 159 | template<class F> constexpr auto transform(F&& f) &; // since C++23 |
| 160 | template<class F> constexpr auto transform(F&& f) &&; // since C++23 |
| 161 | template<class F> constexpr auto transform(F&& f) const&; // since C++23 |
| 162 | template<class F> constexpr auto transform(F&& f) const&&; // since C++23 |
| 163 | template<class F> constexpr optional or_else(F&& f) &&; // since C++23 |
| 164 | template<class F> constexpr optional or_else(F&& f) const&; // since C++23 |
| 165 | |
| 166 | // [optional.mod], modifiers |
| 167 | void reset() noexcept; // constexpr in C++20 |
| 168 | |
| 169 | private: |
| 170 | T *val; // exposition only |
| 171 | }; |
| 172 | |
| 173 | template<class T> |
| 174 | optional(T) -> optional<T>; |
| 175 | |
| 176 | } // namespace std |
| 177 | |
| 178 | */ |
| 179 | |
| 180 | #include <__assert> // all public C++ headers provide the assertion handler |
| 181 | #include <__availability> |
| 182 | #include <__compare/compare_three_way_result.h> |
| 183 | #include <__compare/three_way_comparable.h> |
| 184 | #include <__concepts/invocable.h> |
| 185 | #include <__config> |
| 186 | #include <__functional/hash.h> |
| 187 | #include <__functional/invoke.h> |
| 188 | #include <__functional/reference_wrapper.h> |
| 189 | #include <__functional/unary_function.h> |
| 190 | #include <__memory/addressof.h> |
| 191 | #include <__memory/construct_at.h> |
| 192 | #include <__tuple/sfinae_helpers.h> |
| 193 | #include <__type_traits/add_pointer.h> |
| 194 | #include <__type_traits/conditional.h> |
| 195 | #include <__type_traits/conjunction.h> |
| 196 | #include <__type_traits/decay.h> |
| 197 | #include <__type_traits/disjunction.h> |
| 198 | #include <__type_traits/is_array.h> |
| 199 | #include <__type_traits/is_assignable.h> |
| 200 | #include <__type_traits/is_constructible.h> |
| 201 | #include <__type_traits/is_convertible.h> |
| 202 | #include <__type_traits/is_copy_assignable.h> |
| 203 | #include <__type_traits/is_copy_constructible.h> |
| 204 | #include <__type_traits/is_destructible.h> |
| 205 | #include <__type_traits/is_move_assignable.h> |
| 206 | #include <__type_traits/is_move_constructible.h> |
| 207 | #include <__type_traits/is_nothrow_move_assignable.h> |
| 208 | #include <__type_traits/is_nothrow_move_constructible.h> |
| 209 | #include <__type_traits/is_object.h> |
| 210 | #include <__type_traits/is_reference.h> |
| 211 | #include <__type_traits/is_scalar.h> |
| 212 | #include <__type_traits/is_swappable.h> |
| 213 | #include <__type_traits/is_trivially_copy_assignable.h> |
| 214 | #include <__type_traits/is_trivially_copy_constructible.h> |
| 215 | #include <__type_traits/is_trivially_destructible.h> |
| 216 | #include <__type_traits/is_trivially_move_assignable.h> |
| 217 | #include <__type_traits/is_trivially_move_constructible.h> |
| 218 | #include <__type_traits/negation.h> |
| 219 | #include <__type_traits/remove_const.h> |
| 220 | #include <__type_traits/remove_cvref.h> |
| 221 | #include <__type_traits/remove_reference.h> |
| 222 | #include <__utility/declval.h> |
| 223 | #include <__utility/forward.h> |
| 224 | #include <__utility/in_place.h> |
| 225 | #include <__utility/move.h> |
| 226 | #include <__utility/swap.h> |
| 227 | #include <__verbose_abort> |
| 228 | #include <initializer_list> |
| 229 | #include <new> |
| 230 | #include <stdexcept> |
| 231 | #include <version> |
| 232 | |
| 233 | // standard-mandated includes |
| 234 | |
| 235 | // [optional.syn] |
| 236 | #include <compare> |
| 237 | |
| 238 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 239 | # pragma GCC system_header |
| 240 | #endif |
| 241 | |
| 242 | _LIBCPP_PUSH_MACROS |
| 243 | #include <__undef_macros> |
| 244 | |
| 245 | namespace std // purposefully not using versioning namespace |
| 246 | { |
| 247 | |
| 248 | class _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS bad_optional_access |
| 249 | : public exception |
| 250 | { |
| 251 | public: |
| 252 | // Get the key function ~bad_optional_access() into the dylib |
| 253 | ~bad_optional_access() _NOEXCEPT override; |
| 254 | const char* what() const _NOEXCEPT override; |
| 255 | }; |
| 256 | |
| 257 | } // namespace std |
| 258 | |
| 259 | #if _LIBCPP_STD_VER >= 17 |
| 260 | |
| 261 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 262 | |
| 263 | _LIBCPP_NORETURN |
| 264 | inline _LIBCPP_INLINE_VISIBILITY |
| 265 | _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS |
| 266 | void __throw_bad_optional_access() { |
| 267 | #ifndef _LIBCPP_HAS_NO_EXCEPTIONS |
| 268 | throw bad_optional_access(); |
| 269 | #else |
| 270 | _LIBCPP_VERBOSE_ABORT("bad_optional_access was thrown in -fno-exceptions mode"); |
| 271 | #endif |
| 272 | } |
| 273 | |
| 274 | struct nullopt_t |
| 275 | { |
| 276 | struct __secret_tag { explicit __secret_tag() = default; }; |
| 277 | _LIBCPP_INLINE_VISIBILITY constexpr explicit nullopt_t(__secret_tag, __secret_tag) noexcept {} |
| 278 | }; |
| 279 | |
| 280 | inline constexpr nullopt_t nullopt{nullopt_t::__secret_tag{}, nullopt_t::__secret_tag{}}; |
| 281 | |
| 282 | struct __optional_construct_from_invoke_tag {}; |
| 283 | |
| 284 | template <class _Tp, bool = is_trivially_destructible<_Tp>::value> |
| 285 | struct __optional_destruct_base; |
| 286 | |
| 287 | template <class _Tp> |
| 288 | struct __optional_destruct_base<_Tp, false> |
| 289 | { |
| 290 | typedef _Tp value_type; |
| 291 | static_assert(is_object_v<value_type>, |
| 292 | "instantiation of optional with a non-object type is undefined behavior"); |
| 293 | union |
| 294 | { |
| 295 | char __null_state_; |
| 296 | value_type __val_; |
| 297 | }; |
| 298 | bool __engaged_; |
| 299 | |
| 300 | _LIBCPP_INLINE_VISIBILITY |
| 301 | _LIBCPP_CONSTEXPR_SINCE_CXX20 ~__optional_destruct_base() |
| 302 | { |
| 303 | if (__engaged_) |
| 304 | __val_.~value_type(); |
| 305 | } |
| 306 | |
| 307 | _LIBCPP_INLINE_VISIBILITY |
| 308 | constexpr __optional_destruct_base() noexcept |
| 309 | : __null_state_(), |
| 310 | __engaged_(false) {} |
| 311 | |
| 312 | template <class... _Args> |
| 313 | _LIBCPP_INLINE_VISIBILITY |
| 314 | constexpr explicit __optional_destruct_base(in_place_t, _Args&&... __args) |
| 315 | : __val_(_VSTD::forward<_Args>(__args)...), |
| 316 | __engaged_(true) {} |
| 317 | |
| 318 | #if _LIBCPP_STD_VER >= 23 |
| 319 | template <class _Fp, class... _Args> |
| 320 | _LIBCPP_HIDE_FROM_ABI |
| 321 | constexpr __optional_destruct_base(__optional_construct_from_invoke_tag, _Fp&& __f, _Args&&... __args) |
| 322 | : __val_(_VSTD::invoke(_VSTD::forward<_Fp>(__f), _VSTD::forward<_Args>(__args)...)), __engaged_(true) {} |
| 323 | #endif |
| 324 | |
| 325 | _LIBCPP_INLINE_VISIBILITY |
| 326 | _LIBCPP_CONSTEXPR_SINCE_CXX20 void reset() noexcept |
| 327 | { |
| 328 | if (__engaged_) |
| 329 | { |
| 330 | __val_.~value_type(); |
| 331 | __engaged_ = false; |
| 332 | } |
| 333 | } |
| 334 | }; |
| 335 | |
| 336 | template <class _Tp> |
| 337 | struct __optional_destruct_base<_Tp, true> |
| 338 | { |
| 339 | typedef _Tp value_type; |
| 340 | static_assert(is_object_v<value_type>, |
| 341 | "instantiation of optional with a non-object type is undefined behavior"); |
| 342 | union |
| 343 | { |
| 344 | char __null_state_; |
| 345 | value_type __val_; |
| 346 | }; |
| 347 | bool __engaged_; |
| 348 | |
| 349 | _LIBCPP_INLINE_VISIBILITY |
| 350 | constexpr __optional_destruct_base() noexcept |
| 351 | : __null_state_(), |
| 352 | __engaged_(false) {} |
| 353 | |
| 354 | template <class... _Args> |
| 355 | _LIBCPP_INLINE_VISIBILITY |
| 356 | constexpr explicit __optional_destruct_base(in_place_t, _Args&&... __args) |
| 357 | : __val_(_VSTD::forward<_Args>(__args)...), |
| 358 | __engaged_(true) {} |
| 359 | |
| 360 | #if _LIBCPP_STD_VER >= 23 |
| 361 | template <class _Fp, class... _Args> |
| 362 | _LIBCPP_HIDE_FROM_ABI |
| 363 | constexpr __optional_destruct_base(__optional_construct_from_invoke_tag, _Fp&& __f, _Args&&... __args) |
| 364 | : __val_(_VSTD::invoke(_VSTD::forward<_Fp>(__f), _VSTD::forward<_Args>(__args)...)), __engaged_(true) {} |
| 365 | #endif |
| 366 | |
| 367 | _LIBCPP_INLINE_VISIBILITY |
| 368 | _LIBCPP_CONSTEXPR_SINCE_CXX20 void reset() noexcept |
| 369 | { |
| 370 | if (__engaged_) |
| 371 | { |
| 372 | __engaged_ = false; |
| 373 | } |
| 374 | } |
| 375 | }; |
| 376 | |
| 377 | template <class _Tp, bool = is_reference<_Tp>::value> |
| 378 | struct __optional_storage_base : __optional_destruct_base<_Tp> |
| 379 | { |
| 380 | using __base = __optional_destruct_base<_Tp>; |
| 381 | using value_type = _Tp; |
| 382 | using __base::__base; |
| 383 | |
| 384 | _LIBCPP_INLINE_VISIBILITY |
| 385 | constexpr bool has_value() const noexcept |
| 386 | { |
| 387 | return this->__engaged_; |
| 388 | } |
| 389 | |
| 390 | _LIBCPP_INLINE_VISIBILITY |
| 391 | constexpr value_type& __get() & noexcept |
| 392 | { |
| 393 | return this->__val_; |
| 394 | } |
| 395 | _LIBCPP_INLINE_VISIBILITY |
| 396 | constexpr const value_type& __get() const& noexcept |
| 397 | { |
| 398 | return this->__val_; |
| 399 | } |
| 400 | _LIBCPP_INLINE_VISIBILITY |
| 401 | constexpr value_type&& __get() && noexcept |
| 402 | { |
| 403 | return _VSTD::move(this->__val_); |
| 404 | } |
| 405 | _LIBCPP_INLINE_VISIBILITY |
| 406 | constexpr const value_type&& __get() const&& noexcept |
| 407 | { |
| 408 | return _VSTD::move(this->__val_); |
| 409 | } |
| 410 | |
| 411 | template <class... _Args> |
| 412 | _LIBCPP_INLINE_VISIBILITY |
| 413 | _LIBCPP_CONSTEXPR_SINCE_CXX20 void __construct(_Args&&... __args) |
| 414 | { |
| 415 | _LIBCPP_ASSERT_INTERNAL(!has_value(), "__construct called for engaged __optional_storage"); |
| 416 | #if _LIBCPP_STD_VER >= 20 |
| 417 | _VSTD::construct_at(_VSTD::addressof(this->__val_), _VSTD::forward<_Args>(__args)...); |
| 418 | #else |
| 419 | ::new ((void*)_VSTD::addressof(this->__val_)) value_type(_VSTD::forward<_Args>(__args)...); |
| 420 | #endif |
| 421 | this->__engaged_ = true; |
| 422 | } |
| 423 | |
| 424 | template <class _That> |
| 425 | _LIBCPP_INLINE_VISIBILITY |
| 426 | _LIBCPP_CONSTEXPR_SINCE_CXX20 void __construct_from(_That&& __opt) |
| 427 | { |
| 428 | if (__opt.has_value()) |
| 429 | __construct(_VSTD::forward<_That>(__opt).__get()); |
| 430 | } |
| 431 | |
| 432 | template <class _That> |
| 433 | _LIBCPP_INLINE_VISIBILITY |
| 434 | _LIBCPP_CONSTEXPR_SINCE_CXX20 void __assign_from(_That&& __opt) |
| 435 | { |
| 436 | if (this->__engaged_ == __opt.has_value()) |
| 437 | { |
| 438 | if (this->__engaged_) |
| 439 | this->__val_ = _VSTD::forward<_That>(__opt).__get(); |
| 440 | } |
| 441 | else |
| 442 | { |
| 443 | if (this->__engaged_) |
| 444 | this->reset(); |
| 445 | else |
| 446 | __construct(_VSTD::forward<_That>(__opt).__get()); |
| 447 | } |
| 448 | } |
| 449 | }; |
| 450 | |
| 451 | // optional<T&> is currently required to be ill-formed. However, it may |
| 452 | // be allowed in the future. For this reason, it has already been implemented |
| 453 | // to ensure we can make the change in an ABI-compatible manner. |
| 454 | template <class _Tp> |
| 455 | struct __optional_storage_base<_Tp, true> |
| 456 | { |
| 457 | using value_type = _Tp; |
| 458 | using __raw_type = remove_reference_t<_Tp>; |
| 459 | __raw_type* __value_; |
| 460 | |
| 461 | template <class _Up> |
| 462 | static _LIBCPP_HIDE_FROM_ABI constexpr bool __can_bind_reference() { |
| 463 | using _RawUp = __libcpp_remove_reference_t<_Up>; |
| 464 | using _UpPtr = _RawUp*; |
| 465 | using _RawTp = __libcpp_remove_reference_t<_Tp>; |
| 466 | using _TpPtr = _RawTp*; |
| 467 | using _CheckLValueArg = integral_constant<bool, |
| 468 | (is_lvalue_reference<_Up>::value && is_convertible<_UpPtr, _TpPtr>::value) |
| 469 | || is_same<_RawUp, reference_wrapper<_RawTp>>::value |
| 470 | || is_same<_RawUp, reference_wrapper<__remove_const_t<_RawTp>>>::value |
| 471 | >; |
| 472 | return (is_lvalue_reference<_Tp>::value && _CheckLValueArg::value) |
| 473 | || (is_rvalue_reference<_Tp>::value && !is_lvalue_reference<_Up>::value && |
| 474 | is_convertible<_UpPtr, _TpPtr>::value); |
| 475 | } |
| 476 | |
| 477 | _LIBCPP_INLINE_VISIBILITY |
| 478 | constexpr __optional_storage_base() noexcept |
| 479 | : __value_(nullptr) {} |
| 480 | |
| 481 | template <class _UArg> |
| 482 | _LIBCPP_INLINE_VISIBILITY |
| 483 | constexpr explicit __optional_storage_base(in_place_t, _UArg&& __uarg) |
| 484 | : __value_(_VSTD::addressof(__uarg)) |
| 485 | { |
| 486 | static_assert(__can_bind_reference<_UArg>(), |
| 487 | "Attempted to construct a reference element in tuple from a " |
| 488 | "possible temporary"); |
| 489 | } |
| 490 | |
| 491 | _LIBCPP_INLINE_VISIBILITY |
| 492 | _LIBCPP_CONSTEXPR_SINCE_CXX20 void reset() noexcept { __value_ = nullptr; } |
| 493 | |
| 494 | _LIBCPP_INLINE_VISIBILITY |
| 495 | constexpr bool has_value() const noexcept |
| 496 | { return __value_ != nullptr; } |
| 497 | |
| 498 | _LIBCPP_INLINE_VISIBILITY |
| 499 | constexpr value_type& __get() const& noexcept |
| 500 | { return *__value_; } |
| 501 | |
| 502 | _LIBCPP_INLINE_VISIBILITY |
| 503 | constexpr value_type&& __get() const&& noexcept |
| 504 | { return _VSTD::forward<value_type>(*__value_); } |
| 505 | |
| 506 | template <class _UArg> |
| 507 | _LIBCPP_INLINE_VISIBILITY |
| 508 | _LIBCPP_CONSTEXPR_SINCE_CXX20 void __construct(_UArg&& __val) |
| 509 | { |
| 510 | _LIBCPP_ASSERT_INTERNAL(!has_value(), "__construct called for engaged __optional_storage"); |
| 511 | static_assert(__can_bind_reference<_UArg>(), |
| 512 | "Attempted to construct a reference element in tuple from a " |
| 513 | "possible temporary"); |
| 514 | __value_ = _VSTD::addressof(__val); |
| 515 | } |
| 516 | |
| 517 | template <class _That> |
| 518 | _LIBCPP_INLINE_VISIBILITY |
| 519 | _LIBCPP_CONSTEXPR_SINCE_CXX20 void __construct_from(_That&& __opt) |
| 520 | { |
| 521 | if (__opt.has_value()) |
| 522 | __construct(_VSTD::forward<_That>(__opt).__get()); |
| 523 | } |
| 524 | |
| 525 | template <class _That> |
| 526 | _LIBCPP_INLINE_VISIBILITY |
| 527 | _LIBCPP_CONSTEXPR_SINCE_CXX20 void __assign_from(_That&& __opt) |
| 528 | { |
| 529 | if (has_value() == __opt.has_value()) |
| 530 | { |
| 531 | if (has_value()) |
| 532 | *__value_ = _VSTD::forward<_That>(__opt).__get(); |
| 533 | } |
| 534 | else |
| 535 | { |
| 536 | if (has_value()) |
| 537 | reset(); |
| 538 | else |
| 539 | __construct(_VSTD::forward<_That>(__opt).__get()); |
| 540 | } |
| 541 | } |
| 542 | }; |
| 543 | |
| 544 | template <class _Tp, bool = is_trivially_copy_constructible<_Tp>::value> |
| 545 | struct __optional_copy_base : __optional_storage_base<_Tp> |
| 546 | { |
| 547 | using __optional_storage_base<_Tp>::__optional_storage_base; |
| 548 | }; |
| 549 | |
| 550 | template <class _Tp> |
| 551 | struct __optional_copy_base<_Tp, false> : __optional_storage_base<_Tp> |
| 552 | { |
| 553 | using __optional_storage_base<_Tp>::__optional_storage_base; |
| 554 | |
| 555 | _LIBCPP_INLINE_VISIBILITY |
| 556 | __optional_copy_base() = default; |
| 557 | |
| 558 | _LIBCPP_INLINE_VISIBILITY |
| 559 | _LIBCPP_CONSTEXPR_SINCE_CXX20 __optional_copy_base(const __optional_copy_base& __opt) |
| 560 | { |
| 561 | this->__construct_from(__opt); |
| 562 | } |
| 563 | |
| 564 | _LIBCPP_INLINE_VISIBILITY |
| 565 | __optional_copy_base(__optional_copy_base&&) = default; |
| 566 | _LIBCPP_INLINE_VISIBILITY |
| 567 | __optional_copy_base& operator=(const __optional_copy_base&) = default; |
| 568 | _LIBCPP_INLINE_VISIBILITY |
| 569 | __optional_copy_base& operator=(__optional_copy_base&&) = default; |
| 570 | }; |
| 571 | |
| 572 | template <class _Tp, bool = is_trivially_move_constructible<_Tp>::value> |
| 573 | struct __optional_move_base : __optional_copy_base<_Tp> |
| 574 | { |
| 575 | using __optional_copy_base<_Tp>::__optional_copy_base; |
| 576 | }; |
| 577 | |
| 578 | template <class _Tp> |
| 579 | struct __optional_move_base<_Tp, false> : __optional_copy_base<_Tp> |
| 580 | { |
| 581 | using value_type = _Tp; |
| 582 | using __optional_copy_base<_Tp>::__optional_copy_base; |
| 583 | |
| 584 | _LIBCPP_INLINE_VISIBILITY |
| 585 | __optional_move_base() = default; |
| 586 | _LIBCPP_INLINE_VISIBILITY |
| 587 | __optional_move_base(const __optional_move_base&) = default; |
| 588 | |
| 589 | _LIBCPP_INLINE_VISIBILITY |
| 590 | _LIBCPP_CONSTEXPR_SINCE_CXX20 __optional_move_base(__optional_move_base&& __opt) |
| 591 | noexcept(is_nothrow_move_constructible_v<value_type>) |
| 592 | { |
| 593 | this->__construct_from(_VSTD::move(__opt)); |
| 594 | } |
| 595 | |
| 596 | _LIBCPP_INLINE_VISIBILITY |
| 597 | __optional_move_base& operator=(const __optional_move_base&) = default; |
| 598 | _LIBCPP_INLINE_VISIBILITY |
| 599 | __optional_move_base& operator=(__optional_move_base&&) = default; |
| 600 | }; |
| 601 | |
| 602 | template <class _Tp, bool = |
| 603 | is_trivially_destructible<_Tp>::value && |
| 604 | is_trivially_copy_constructible<_Tp>::value && |
| 605 | is_trivially_copy_assignable<_Tp>::value> |
| 606 | struct __optional_copy_assign_base : __optional_move_base<_Tp> |
| 607 | { |
| 608 | using __optional_move_base<_Tp>::__optional_move_base; |
| 609 | }; |
| 610 | |
| 611 | template <class _Tp> |
| 612 | struct __optional_copy_assign_base<_Tp, false> : __optional_move_base<_Tp> |
| 613 | { |
| 614 | using __optional_move_base<_Tp>::__optional_move_base; |
| 615 | |
| 616 | _LIBCPP_INLINE_VISIBILITY |
| 617 | __optional_copy_assign_base() = default; |
| 618 | _LIBCPP_INLINE_VISIBILITY |
| 619 | __optional_copy_assign_base(const __optional_copy_assign_base&) = default; |
| 620 | _LIBCPP_INLINE_VISIBILITY |
| 621 | __optional_copy_assign_base(__optional_copy_assign_base&&) = default; |
| 622 | |
| 623 | _LIBCPP_INLINE_VISIBILITY |
| 624 | _LIBCPP_CONSTEXPR_SINCE_CXX20 __optional_copy_assign_base& operator=(const __optional_copy_assign_base& __opt) |
| 625 | { |
| 626 | this->__assign_from(__opt); |
| 627 | return *this; |
| 628 | } |
| 629 | |
| 630 | _LIBCPP_INLINE_VISIBILITY |
| 631 | __optional_copy_assign_base& operator=(__optional_copy_assign_base&&) = default; |
| 632 | }; |
| 633 | |
| 634 | template <class _Tp, bool = |
| 635 | is_trivially_destructible<_Tp>::value && |
| 636 | is_trivially_move_constructible<_Tp>::value && |
| 637 | is_trivially_move_assignable<_Tp>::value> |
| 638 | struct __optional_move_assign_base : __optional_copy_assign_base<_Tp> |
| 639 | { |
| 640 | using __optional_copy_assign_base<_Tp>::__optional_copy_assign_base; |
| 641 | }; |
| 642 | |
| 643 | template <class _Tp> |
| 644 | struct __optional_move_assign_base<_Tp, false> : __optional_copy_assign_base<_Tp> |
| 645 | { |
| 646 | using value_type = _Tp; |
| 647 | using __optional_copy_assign_base<_Tp>::__optional_copy_assign_base; |
| 648 | |
| 649 | _LIBCPP_INLINE_VISIBILITY |
| 650 | __optional_move_assign_base() = default; |
| 651 | _LIBCPP_INLINE_VISIBILITY |
| 652 | __optional_move_assign_base(const __optional_move_assign_base& __opt) = default; |
| 653 | _LIBCPP_INLINE_VISIBILITY |
| 654 | __optional_move_assign_base(__optional_move_assign_base&&) = default; |
| 655 | _LIBCPP_INLINE_VISIBILITY |
| 656 | __optional_move_assign_base& operator=(const __optional_move_assign_base&) = default; |
| 657 | |
| 658 | _LIBCPP_INLINE_VISIBILITY |
| 659 | _LIBCPP_CONSTEXPR_SINCE_CXX20 __optional_move_assign_base& operator=(__optional_move_assign_base&& __opt) |
| 660 | noexcept(is_nothrow_move_assignable_v<value_type> && |
| 661 | is_nothrow_move_constructible_v<value_type>) |
| 662 | { |
| 663 | this->__assign_from(_VSTD::move(__opt)); |
| 664 | return *this; |
| 665 | } |
| 666 | }; |
| 667 | |
| 668 | template <class _Tp> |
| 669 | using __optional_sfinae_ctor_base_t = __sfinae_ctor_base< |
| 670 | is_copy_constructible<_Tp>::value, |
| 671 | is_move_constructible<_Tp>::value |
| 672 | >; |
| 673 | |
| 674 | template <class _Tp> |
| 675 | using __optional_sfinae_assign_base_t = __sfinae_assign_base< |
| 676 | (is_copy_constructible<_Tp>::value && is_copy_assignable<_Tp>::value), |
| 677 | (is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value) |
| 678 | >; |
| 679 | |
| 680 | template<class _Tp> |
| 681 | class optional; |
| 682 | |
| 683 | #if _LIBCPP_STD_VER >= 20 |
| 684 | |
| 685 | template <class _Tp> |
| 686 | concept __is_derived_from_optional = requires(const _Tp& __t) { []<class _Up>(const optional<_Up>&) {}(__t); }; |
| 687 | |
| 688 | # endif // _LIBCPP_STD_VER >= 20 |
| 689 | |
| 690 | template <class _Tp> |
| 691 | struct __is_std_optional : false_type {}; |
| 692 | template <class _Tp> struct __is_std_optional<optional<_Tp>> : true_type {}; |
| 693 | |
| 694 | template <class _Tp> |
| 695 | class _LIBCPP_DECLSPEC_EMPTY_BASES optional |
| 696 | : private __optional_move_assign_base<_Tp> |
| 697 | , private __optional_sfinae_ctor_base_t<_Tp> |
| 698 | , private __optional_sfinae_assign_base_t<_Tp> |
| 699 | { |
| 700 | using __base = __optional_move_assign_base<_Tp>; |
| 701 | public: |
| 702 | using value_type = _Tp; |
| 703 | |
| 704 | private: |
| 705 | // Disable the reference extension using this static assert. |
| 706 | static_assert(!is_same_v<__remove_cvref_t<value_type>, in_place_t>, |
| 707 | "instantiation of optional with in_place_t is ill-formed"); |
| 708 | static_assert(!is_same_v<__remove_cvref_t<value_type>, nullopt_t>, |
| 709 | "instantiation of optional with nullopt_t is ill-formed"); |
| 710 | static_assert(!is_reference_v<value_type>, |
| 711 | "instantiation of optional with a reference type is ill-formed"); |
| 712 | static_assert(is_destructible_v<value_type>, |
| 713 | "instantiation of optional with a non-destructible type is ill-formed"); |
| 714 | static_assert(!is_array_v<value_type>, |
| 715 | "instantiation of optional with an array type is ill-formed"); |
| 716 | |
| 717 | // LWG2756: conditionally explicit conversion from _Up |
| 718 | struct _CheckOptionalArgsConstructor { |
| 719 | template <class _Up> |
| 720 | _LIBCPP_HIDE_FROM_ABI static constexpr bool __enable_implicit() { |
| 721 | return is_constructible_v<_Tp, _Up&&> && |
| 722 | is_convertible_v<_Up&&, _Tp>; |
| 723 | } |
| 724 | |
| 725 | template <class _Up> |
| 726 | _LIBCPP_HIDE_FROM_ABI static constexpr bool __enable_explicit() { |
| 727 | return is_constructible_v<_Tp, _Up&&> && |
| 728 | !is_convertible_v<_Up&&, _Tp>; |
| 729 | } |
| 730 | }; |
| 731 | template <class _Up> |
| 732 | using _CheckOptionalArgsCtor = _If< |
| 733 | _IsNotSame<__remove_cvref_t<_Up>, in_place_t>::value && |
| 734 | _IsNotSame<__remove_cvref_t<_Up>, optional>::value && |
| 735 | (!is_same_v<remove_cv_t<_Tp>, bool> || !__is_std_optional<__remove_cvref_t<_Up>>::value), |
| 736 | _CheckOptionalArgsConstructor, |
| 737 | __check_tuple_constructor_fail |
| 738 | >; |
| 739 | template <class _QualUp> |
| 740 | struct _CheckOptionalLikeConstructor { |
| 741 | template <class _Up, class _Opt = optional<_Up>> |
| 742 | using __check_constructible_from_opt = _Or< |
| 743 | is_constructible<_Tp, _Opt&>, |
| 744 | is_constructible<_Tp, _Opt const&>, |
| 745 | is_constructible<_Tp, _Opt&&>, |
| 746 | is_constructible<_Tp, _Opt const&&>, |
| 747 | is_convertible<_Opt&, _Tp>, |
| 748 | is_convertible<_Opt const&, _Tp>, |
| 749 | is_convertible<_Opt&&, _Tp>, |
| 750 | is_convertible<_Opt const&&, _Tp> |
| 751 | >; |
| 752 | template <class _Up, class _Opt = optional<_Up>> |
| 753 | using __check_assignable_from_opt = _Or< |
| 754 | is_assignable<_Tp&, _Opt&>, |
| 755 | is_assignable<_Tp&, _Opt const&>, |
| 756 | is_assignable<_Tp&, _Opt&&>, |
| 757 | is_assignable<_Tp&, _Opt const&&> |
| 758 | >; |
| 759 | template <class _Up, class _QUp = _QualUp> |
| 760 | _LIBCPP_HIDE_FROM_ABI static constexpr bool __enable_implicit() { |
| 761 | return is_convertible<_QUp, _Tp>::value && |
| 762 | (is_same_v<remove_cv_t<_Tp>, bool> || !__check_constructible_from_opt<_Up>::value); |
| 763 | } |
| 764 | template <class _Up, class _QUp = _QualUp> |
| 765 | _LIBCPP_HIDE_FROM_ABI static constexpr bool __enable_explicit() { |
| 766 | return !is_convertible<_QUp, _Tp>::value && |
| 767 | (is_same_v<remove_cv_t<_Tp>, bool> || !__check_constructible_from_opt<_Up>::value); |
| 768 | } |
| 769 | template <class _Up, class _QUp = _QualUp> |
| 770 | _LIBCPP_HIDE_FROM_ABI static constexpr bool __enable_assign() { |
| 771 | // Construction and assignability of _QUp to _Tp has already been |
| 772 | // checked. |
| 773 | return !__check_constructible_from_opt<_Up>::value && |
| 774 | !__check_assignable_from_opt<_Up>::value; |
| 775 | } |
| 776 | }; |
| 777 | |
| 778 | template <class _Up, class _QualUp> |
| 779 | using _CheckOptionalLikeCtor = _If< |
| 780 | _And< |
| 781 | _IsNotSame<_Up, _Tp>, |
| 782 | is_constructible<_Tp, _QualUp> |
| 783 | >::value, |
| 784 | _CheckOptionalLikeConstructor<_QualUp>, |
| 785 | __check_tuple_constructor_fail |
| 786 | >; |
| 787 | template <class _Up, class _QualUp> |
| 788 | using _CheckOptionalLikeAssign = _If< |
| 789 | _And< |
| 790 | _IsNotSame<_Up, _Tp>, |
| 791 | is_constructible<_Tp, _QualUp>, |
| 792 | is_assignable<_Tp&, _QualUp> |
| 793 | >::value, |
| 794 | _CheckOptionalLikeConstructor<_QualUp>, |
| 795 | __check_tuple_constructor_fail |
| 796 | >; |
| 797 | |
| 798 | public: |
| 799 | |
| 800 | _LIBCPP_INLINE_VISIBILITY constexpr optional() noexcept {} |
| 801 | _LIBCPP_INLINE_VISIBILITY constexpr optional(const optional&) = default; |
| 802 | _LIBCPP_INLINE_VISIBILITY constexpr optional(optional&&) = default; |
| 803 | _LIBCPP_INLINE_VISIBILITY constexpr optional(nullopt_t) noexcept {} |
| 804 | |
| 805 | template <class _InPlaceT, class... _Args, class = enable_if_t< |
| 806 | _And< |
| 807 | _IsSame<_InPlaceT, in_place_t>, |
| 808 | is_constructible<value_type, _Args...> |
| 809 | >::value |
| 810 | > |
| 811 | > |
| 812 | _LIBCPP_INLINE_VISIBILITY |
| 813 | constexpr explicit optional(_InPlaceT, _Args&&... __args) |
| 814 | : __base(in_place, _VSTD::forward<_Args>(__args)...) {} |
| 815 | |
| 816 | template <class _Up, class... _Args, class = enable_if_t< |
| 817 | is_constructible_v<value_type, initializer_list<_Up>&, _Args...>> |
| 818 | > |
| 819 | _LIBCPP_INLINE_VISIBILITY |
| 820 | constexpr explicit optional(in_place_t, initializer_list<_Up> __il, _Args&&... __args) |
| 821 | : __base(in_place, __il, _VSTD::forward<_Args>(__args)...) {} |
| 822 | |
| 823 | template <class _Up = value_type, enable_if_t< |
| 824 | _CheckOptionalArgsCtor<_Up>::template __enable_implicit<_Up>() |
| 825 | , int> = 0> |
| 826 | _LIBCPP_INLINE_VISIBILITY |
| 827 | constexpr optional(_Up&& __v) |
| 828 | : __base(in_place, _VSTD::forward<_Up>(__v)) {} |
| 829 | |
| 830 | template <class _Up, enable_if_t< |
| 831 | _CheckOptionalArgsCtor<_Up>::template __enable_explicit<_Up>() |
| 832 | , int> = 0> |
| 833 | _LIBCPP_INLINE_VISIBILITY |
| 834 | constexpr explicit optional(_Up&& __v) |
| 835 | : __base(in_place, _VSTD::forward<_Up>(__v)) {} |
| 836 | |
| 837 | // LWG2756: conditionally explicit conversion from const optional<_Up>& |
| 838 | template <class _Up, enable_if_t< |
| 839 | _CheckOptionalLikeCtor<_Up, _Up const&>::template __enable_implicit<_Up>() |
| 840 | , int> = 0> |
| 841 | _LIBCPP_INLINE_VISIBILITY |
| 842 | _LIBCPP_CONSTEXPR_SINCE_CXX20 optional(const optional<_Up>& __v) |
| 843 | { |
| 844 | this->__construct_from(__v); |
| 845 | } |
| 846 | template <class _Up, enable_if_t< |
| 847 | _CheckOptionalLikeCtor<_Up, _Up const&>::template __enable_explicit<_Up>() |
| 848 | , int> = 0> |
| 849 | _LIBCPP_INLINE_VISIBILITY |
| 850 | _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit optional(const optional<_Up>& __v) |
| 851 | { |
| 852 | this->__construct_from(__v); |
| 853 | } |
| 854 | |
| 855 | // LWG2756: conditionally explicit conversion from optional<_Up>&& |
| 856 | template <class _Up, enable_if_t< |
| 857 | _CheckOptionalLikeCtor<_Up, _Up &&>::template __enable_implicit<_Up>() |
| 858 | , int> = 0> |
| 859 | _LIBCPP_INLINE_VISIBILITY |
| 860 | _LIBCPP_CONSTEXPR_SINCE_CXX20 optional(optional<_Up>&& __v) |
| 861 | { |
| 862 | this->__construct_from(_VSTD::move(__v)); |
| 863 | } |
| 864 | template <class _Up, enable_if_t< |
| 865 | _CheckOptionalLikeCtor<_Up, _Up &&>::template __enable_explicit<_Up>() |
| 866 | , int> = 0> |
| 867 | _LIBCPP_INLINE_VISIBILITY |
| 868 | _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit optional(optional<_Up>&& __v) |
| 869 | { |
| 870 | this->__construct_from(_VSTD::move(__v)); |
| 871 | } |
| 872 | |
| 873 | #if _LIBCPP_STD_VER >= 23 |
| 874 | template<class _Fp, class... _Args> |
| 875 | _LIBCPP_HIDE_FROM_ABI |
| 876 | constexpr explicit optional(__optional_construct_from_invoke_tag, _Fp&& __f, _Args&&... __args) |
| 877 | : __base(__optional_construct_from_invoke_tag{}, _VSTD::forward<_Fp>(__f), _VSTD::forward<_Args>(__args)...) { |
| 878 | } |
| 879 | #endif |
| 880 | |
| 881 | _LIBCPP_INLINE_VISIBILITY |
| 882 | _LIBCPP_CONSTEXPR_SINCE_CXX20 optional& operator=(nullopt_t) noexcept |
| 883 | { |
| 884 | reset(); |
| 885 | return *this; |
| 886 | } |
| 887 | |
| 888 | _LIBCPP_HIDE_FROM_ABI constexpr optional& operator=(const optional&) = default; |
| 889 | _LIBCPP_HIDE_FROM_ABI constexpr optional& operator=(optional&&) = default; |
| 890 | |
| 891 | // LWG2756 |
| 892 | template <class _Up = value_type, |
| 893 | class = enable_if_t< |
| 894 | _And< |
| 895 | _IsNotSame<__remove_cvref_t<_Up>, optional>, |
| 896 | _Or< |
| 897 | _IsNotSame<__remove_cvref_t<_Up>, value_type>, |
| 898 | _Not<is_scalar<value_type>> |
| 899 | >, |
| 900 | is_constructible<value_type, _Up>, |
| 901 | is_assignable<value_type&, _Up> |
| 902 | >::value> |
| 903 | > |
| 904 | _LIBCPP_INLINE_VISIBILITY |
| 905 | _LIBCPP_CONSTEXPR_SINCE_CXX20 optional& |
| 906 | operator=(_Up&& __v) |
| 907 | { |
| 908 | if (this->has_value()) |
| 909 | this->__get() = _VSTD::forward<_Up>(__v); |
| 910 | else |
| 911 | this->__construct(_VSTD::forward<_Up>(__v)); |
| 912 | return *this; |
| 913 | } |
| 914 | |
| 915 | // LWG2756 |
| 916 | template <class _Up, enable_if_t< |
| 917 | _CheckOptionalLikeAssign<_Up, _Up const&>::template __enable_assign<_Up>() |
| 918 | , int> = 0> |
| 919 | _LIBCPP_INLINE_VISIBILITY |
| 920 | _LIBCPP_CONSTEXPR_SINCE_CXX20 optional& |
| 921 | operator=(const optional<_Up>& __v) |
| 922 | { |
| 923 | this->__assign_from(__v); |
| 924 | return *this; |
| 925 | } |
| 926 | |
| 927 | // LWG2756 |
| 928 | template <class _Up, enable_if_t< |
| 929 | _CheckOptionalLikeCtor<_Up, _Up &&>::template __enable_assign<_Up>() |
| 930 | , int> = 0> |
| 931 | _LIBCPP_INLINE_VISIBILITY |
| 932 | _LIBCPP_CONSTEXPR_SINCE_CXX20 optional& |
| 933 | operator=(optional<_Up>&& __v) |
| 934 | { |
| 935 | this->__assign_from(_VSTD::move(__v)); |
| 936 | return *this; |
| 937 | } |
| 938 | |
| 939 | template <class... _Args, |
| 940 | class = enable_if_t |
| 941 | < |
| 942 | is_constructible_v<value_type, _Args...> |
| 943 | > |
| 944 | > |
| 945 | _LIBCPP_INLINE_VISIBILITY |
| 946 | _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp & |
| 947 | emplace(_Args&&... __args) |
| 948 | { |
| 949 | reset(); |
| 950 | this->__construct(_VSTD::forward<_Args>(__args)...); |
| 951 | return this->__get(); |
| 952 | } |
| 953 | |
| 954 | template <class _Up, class... _Args, |
| 955 | class = enable_if_t |
| 956 | < |
| 957 | is_constructible_v<value_type, initializer_list<_Up>&, _Args...> |
| 958 | > |
| 959 | > |
| 960 | _LIBCPP_INLINE_VISIBILITY |
| 961 | _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp & |
| 962 | emplace(initializer_list<_Up> __il, _Args&&... __args) |
| 963 | { |
| 964 | reset(); |
| 965 | this->__construct(__il, _VSTD::forward<_Args>(__args)...); |
| 966 | return this->__get(); |
| 967 | } |
| 968 | |
| 969 | _LIBCPP_INLINE_VISIBILITY |
| 970 | _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(optional& __opt) |
| 971 | noexcept(is_nothrow_move_constructible_v<value_type> && |
| 972 | is_nothrow_swappable_v<value_type>) |
| 973 | { |
| 974 | if (this->has_value() == __opt.has_value()) |
| 975 | { |
| 976 | using _VSTD::swap; |
| 977 | if (this->has_value()) |
| 978 | swap(this->__get(), __opt.__get()); |
| 979 | } |
| 980 | else |
| 981 | { |
| 982 | if (this->has_value()) |
| 983 | { |
| 984 | __opt.__construct(_VSTD::move(this->__get())); |
| 985 | reset(); |
| 986 | } |
| 987 | else |
| 988 | { |
| 989 | this->__construct(_VSTD::move(__opt.__get())); |
| 990 | __opt.reset(); |
| 991 | } |
| 992 | } |
| 993 | } |
| 994 | |
| 995 | _LIBCPP_INLINE_VISIBILITY |
| 996 | constexpr |
| 997 | add_pointer_t<value_type const> |
| 998 | operator->() const |
| 999 | { |
| 1000 | _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(this->has_value(), "optional operator-> called on a disengaged value"); |
| 1001 | return _VSTD::addressof(this->__get()); |
| 1002 | } |
| 1003 | |
| 1004 | _LIBCPP_INLINE_VISIBILITY |
| 1005 | constexpr |
| 1006 | add_pointer_t<value_type> |
| 1007 | operator->() |
| 1008 | { |
| 1009 | _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(this->has_value(), "optional operator-> called on a disengaged value"); |
| 1010 | return _VSTD::addressof(this->__get()); |
| 1011 | } |
| 1012 | |
| 1013 | _LIBCPP_INLINE_VISIBILITY |
| 1014 | constexpr |
| 1015 | const value_type& |
| 1016 | operator*() const& noexcept |
| 1017 | { |
| 1018 | _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(this->has_value(), "optional operator* called on a disengaged value"); |
| 1019 | return this->__get(); |
| 1020 | } |
| 1021 | |
| 1022 | _LIBCPP_INLINE_VISIBILITY |
| 1023 | constexpr |
| 1024 | value_type& |
| 1025 | operator*() & noexcept |
| 1026 | { |
| 1027 | _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(this->has_value(), "optional operator* called on a disengaged value"); |
| 1028 | return this->__get(); |
| 1029 | } |
| 1030 | |
| 1031 | _LIBCPP_INLINE_VISIBILITY |
| 1032 | constexpr |
| 1033 | value_type&& |
| 1034 | operator*() && noexcept |
| 1035 | { |
| 1036 | _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(this->has_value(), "optional operator* called on a disengaged value"); |
| 1037 | return _VSTD::move(this->__get()); |
| 1038 | } |
| 1039 | |
| 1040 | _LIBCPP_INLINE_VISIBILITY |
| 1041 | constexpr |
| 1042 | const value_type&& |
| 1043 | operator*() const&& noexcept |
| 1044 | { |
| 1045 | _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(this->has_value(), "optional operator* called on a disengaged value"); |
| 1046 | return _VSTD::move(this->__get()); |
| 1047 | } |
| 1048 | |
| 1049 | _LIBCPP_INLINE_VISIBILITY |
| 1050 | constexpr explicit operator bool() const noexcept { return has_value(); } |
| 1051 | |
| 1052 | using __base::has_value; |
| 1053 | using __base::__get; |
| 1054 | |
| 1055 | _LIBCPP_INLINE_VISIBILITY |
| 1056 | _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS |
| 1057 | constexpr value_type const& value() const& |
| 1058 | { |
| 1059 | if (!this->has_value()) |
| 1060 | __throw_bad_optional_access(); |
| 1061 | return this->__get(); |
| 1062 | } |
| 1063 | |
| 1064 | _LIBCPP_INLINE_VISIBILITY |
| 1065 | _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS |
| 1066 | constexpr value_type& value() & |
| 1067 | { |
| 1068 | if (!this->has_value()) |
| 1069 | __throw_bad_optional_access(); |
| 1070 | return this->__get(); |
| 1071 | } |
| 1072 | |
| 1073 | _LIBCPP_INLINE_VISIBILITY |
| 1074 | _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS |
| 1075 | constexpr value_type&& value() && |
| 1076 | { |
| 1077 | if (!this->has_value()) |
| 1078 | __throw_bad_optional_access(); |
| 1079 | return _VSTD::move(this->__get()); |
| 1080 | } |
| 1081 | |
| 1082 | _LIBCPP_INLINE_VISIBILITY |
| 1083 | _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS |
| 1084 | constexpr value_type const&& value() const&& |
| 1085 | { |
| 1086 | if (!this->has_value()) |
| 1087 | __throw_bad_optional_access(); |
| 1088 | return _VSTD::move(this->__get()); |
| 1089 | } |
| 1090 | |
| 1091 | template <class _Up> |
| 1092 | _LIBCPP_INLINE_VISIBILITY |
| 1093 | constexpr value_type value_or(_Up&& __v) const& |
| 1094 | { |
| 1095 | static_assert(is_copy_constructible_v<value_type>, |
| 1096 | "optional<T>::value_or: T must be copy constructible"); |
| 1097 | static_assert(is_convertible_v<_Up, value_type>, |
| 1098 | "optional<T>::value_or: U must be convertible to T"); |
| 1099 | return this->has_value() ? this->__get() : |
| 1100 | static_cast<value_type>(_VSTD::forward<_Up>(__v)); |
| 1101 | } |
| 1102 | |
| 1103 | template <class _Up> |
| 1104 | _LIBCPP_INLINE_VISIBILITY |
| 1105 | constexpr value_type value_or(_Up&& __v) && |
| 1106 | { |
| 1107 | static_assert(is_move_constructible_v<value_type>, |
| 1108 | "optional<T>::value_or: T must be move constructible"); |
| 1109 | static_assert(is_convertible_v<_Up, value_type>, |
| 1110 | "optional<T>::value_or: U must be convertible to T"); |
| 1111 | return this->has_value() ? _VSTD::move(this->__get()) : |
| 1112 | static_cast<value_type>(_VSTD::forward<_Up>(__v)); |
| 1113 | } |
| 1114 | |
| 1115 | #if _LIBCPP_STD_VER >= 23 |
| 1116 | template<class _Func> |
| 1117 | _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS |
| 1118 | constexpr auto and_then(_Func&& __f) & { |
| 1119 | using _Up = invoke_result_t<_Func, value_type&>; |
| 1120 | static_assert(__is_std_optional<remove_cvref_t<_Up>>::value, |
| 1121 | "Result of f(value()) must be a specialization of std::optional"); |
| 1122 | if (*this) |
| 1123 | return _VSTD::invoke(_VSTD::forward<_Func>(__f), value()); |
| 1124 | return remove_cvref_t<_Up>(); |
| 1125 | } |
| 1126 | |
| 1127 | template<class _Func> |
| 1128 | _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS |
| 1129 | constexpr auto and_then(_Func&& __f) const& { |
| 1130 | using _Up = invoke_result_t<_Func, const value_type&>; |
| 1131 | static_assert(__is_std_optional<remove_cvref_t<_Up>>::value, |
| 1132 | "Result of f(value()) must be a specialization of std::optional"); |
| 1133 | if (*this) |
| 1134 | return _VSTD::invoke(_VSTD::forward<_Func>(__f), value()); |
| 1135 | return remove_cvref_t<_Up>(); |
| 1136 | } |
| 1137 | |
| 1138 | template<class _Func> |
| 1139 | _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS |
| 1140 | constexpr auto and_then(_Func&& __f) && { |
| 1141 | using _Up = invoke_result_t<_Func, value_type&&>; |
| 1142 | static_assert(__is_std_optional<remove_cvref_t<_Up>>::value, |
| 1143 | "Result of f(std::move(value())) must be a specialization of std::optional"); |
| 1144 | if (*this) |
| 1145 | return _VSTD::invoke(_VSTD::forward<_Func>(__f), _VSTD::move(value())); |
| 1146 | return remove_cvref_t<_Up>(); |
| 1147 | } |
| 1148 | |
| 1149 | template<class _Func> |
| 1150 | _LIBCPP_HIDE_FROM_ABI |
| 1151 | constexpr auto and_then(_Func&& __f) const&& { |
| 1152 | using _Up = invoke_result_t<_Func, const value_type&&>; |
| 1153 | static_assert(__is_std_optional<remove_cvref_t<_Up>>::value, |
| 1154 | "Result of f(std::move(value())) must be a specialization of std::optional"); |
| 1155 | if (*this) |
| 1156 | return _VSTD::invoke(_VSTD::forward<_Func>(__f), _VSTD::move(value())); |
| 1157 | return remove_cvref_t<_Up>(); |
| 1158 | } |
| 1159 | |
| 1160 | template<class _Func> |
| 1161 | _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS |
| 1162 | constexpr auto transform(_Func&& __f) & { |
| 1163 | using _Up = remove_cv_t<invoke_result_t<_Func, value_type&>>; |
| 1164 | static_assert(!is_array_v<_Up>, "Result of f(value()) should not be an Array"); |
| 1165 | static_assert(!is_same_v<_Up, in_place_t>, |
| 1166 | "Result of f(value()) should not be std::in_place_t"); |
| 1167 | static_assert(!is_same_v<_Up, nullopt_t>, |
| 1168 | "Result of f(value()) should not be std::nullopt_t"); |
| 1169 | static_assert(is_object_v<_Up>, "Result of f(value()) should be an object type"); |
| 1170 | if (*this) |
| 1171 | return optional<_Up>(__optional_construct_from_invoke_tag{}, _VSTD::forward<_Func>(__f), value()); |
| 1172 | return optional<_Up>(); |
| 1173 | } |
| 1174 | |
| 1175 | template<class _Func> |
| 1176 | _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS |
| 1177 | constexpr auto transform(_Func&& __f) const& { |
| 1178 | using _Up = remove_cv_t<invoke_result_t<_Func, const value_type&>>; |
| 1179 | static_assert(!is_array_v<_Up>, "Result of f(value()) should not be an Array"); |
| 1180 | static_assert(!is_same_v<_Up, in_place_t>, |
| 1181 | "Result of f(value()) should not be std::in_place_t"); |
| 1182 | static_assert(!is_same_v<_Up, nullopt_t>, |
| 1183 | "Result of f(value()) should not be std::nullopt_t"); |
| 1184 | static_assert(is_object_v<_Up>, "Result of f(value()) should be an object type"); |
| 1185 | if (*this) |
| 1186 | return optional<_Up>(__optional_construct_from_invoke_tag{}, _VSTD::forward<_Func>(__f), value()); |
| 1187 | return optional<_Up>(); |
| 1188 | } |
| 1189 | |
| 1190 | template<class _Func> |
| 1191 | _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS |
| 1192 | constexpr auto transform(_Func&& __f) && { |
| 1193 | using _Up = remove_cv_t<invoke_result_t<_Func, value_type&&>>; |
| 1194 | static_assert(!is_array_v<_Up>, "Result of f(std::move(value())) should not be an Array"); |
| 1195 | static_assert(!is_same_v<_Up, in_place_t>, |
| 1196 | "Result of f(std::move(value())) should not be std::in_place_t"); |
| 1197 | static_assert(!is_same_v<_Up, nullopt_t>, |
| 1198 | "Result of f(std::move(value())) should not be std::nullopt_t"); |
| 1199 | static_assert(is_object_v<_Up>, "Result of f(std::move(value())) should be an object type"); |
| 1200 | if (*this) |
| 1201 | return optional<_Up>(__optional_construct_from_invoke_tag{}, _VSTD::forward<_Func>(__f), _VSTD::move(value())); |
| 1202 | return optional<_Up>(); |
| 1203 | } |
| 1204 | |
| 1205 | template<class _Func> |
| 1206 | _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS |
| 1207 | constexpr auto transform(_Func&& __f) const&& { |
| 1208 | using _Up = remove_cvref_t<invoke_result_t<_Func, const value_type&&>>; |
| 1209 | static_assert(!is_array_v<_Up>, "Result of f(std::move(value())) should not be an Array"); |
| 1210 | static_assert(!is_same_v<_Up, in_place_t>, |
| 1211 | "Result of f(std::move(value())) should not be std::in_place_t"); |
| 1212 | static_assert(!is_same_v<_Up, nullopt_t>, |
| 1213 | "Result of f(std::move(value())) should not be std::nullopt_t"); |
| 1214 | static_assert(is_object_v<_Up>, "Result of f(std::move(value())) should be an object type"); |
| 1215 | if (*this) |
| 1216 | return optional<_Up>(__optional_construct_from_invoke_tag{}, _VSTD::forward<_Func>(__f), _VSTD::move(value())); |
| 1217 | return optional<_Up>(); |
| 1218 | } |
| 1219 | |
| 1220 | template<invocable _Func> |
| 1221 | _LIBCPP_HIDE_FROM_ABI |
| 1222 | constexpr optional or_else(_Func&& __f) const& requires is_copy_constructible_v<value_type> { |
| 1223 | static_assert(is_same_v<remove_cvref_t<invoke_result_t<_Func>>, optional>, |
| 1224 | "Result of f() should be the same type as this optional"); |
| 1225 | if (*this) |
| 1226 | return *this; |
| 1227 | return _VSTD::forward<_Func>(__f)(); |
| 1228 | } |
| 1229 | |
| 1230 | template<invocable _Func> |
| 1231 | _LIBCPP_HIDE_FROM_ABI |
| 1232 | constexpr optional or_else(_Func&& __f) && requires is_move_constructible_v<value_type> { |
| 1233 | static_assert(is_same_v<remove_cvref_t<invoke_result_t<_Func>>, optional>, |
| 1234 | "Result of f() should be the same type as this optional"); |
| 1235 | if (*this) |
| 1236 | return _VSTD::move(*this); |
| 1237 | return _VSTD::forward<_Func>(__f)(); |
| 1238 | } |
| 1239 | #endif // _LIBCPP_STD_VER >= 23 |
| 1240 | |
| 1241 | using __base::reset; |
| 1242 | }; |
| 1243 | |
| 1244 | #if _LIBCPP_STD_VER >= 17 |
| 1245 | template<class _Tp> |
| 1246 | optional(_Tp) -> optional<_Tp>; |
| 1247 | #endif |
| 1248 | |
| 1249 | // Comparisons between optionals |
| 1250 | template <class _Tp, class _Up> |
| 1251 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1252 | enable_if_t< |
| 1253 | is_convertible_v<decltype(std::declval<const _Tp&>() == |
| 1254 | std::declval<const _Up&>()), bool>, |
| 1255 | bool |
| 1256 | > |
| 1257 | operator==(const optional<_Tp>& __x, const optional<_Up>& __y) |
| 1258 | { |
| 1259 | if (static_cast<bool>(__x) != static_cast<bool>(__y)) |
| 1260 | return false; |
| 1261 | if (!static_cast<bool>(__x)) |
| 1262 | return true; |
| 1263 | return *__x == *__y; |
| 1264 | } |
| 1265 | |
| 1266 | template <class _Tp, class _Up> |
| 1267 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1268 | enable_if_t< |
| 1269 | is_convertible_v<decltype(std::declval<const _Tp&>() != |
| 1270 | std::declval<const _Up&>()), bool>, |
| 1271 | bool |
| 1272 | > |
| 1273 | operator!=(const optional<_Tp>& __x, const optional<_Up>& __y) |
| 1274 | { |
| 1275 | if (static_cast<bool>(__x) != static_cast<bool>(__y)) |
| 1276 | return true; |
| 1277 | if (!static_cast<bool>(__x)) |
| 1278 | return false; |
| 1279 | return *__x != *__y; |
| 1280 | } |
| 1281 | |
| 1282 | template <class _Tp, class _Up> |
| 1283 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1284 | enable_if_t< |
| 1285 | is_convertible_v<decltype(std::declval<const _Tp&>() < |
| 1286 | std::declval<const _Up&>()), bool>, |
| 1287 | bool |
| 1288 | > |
| 1289 | operator<(const optional<_Tp>& __x, const optional<_Up>& __y) |
| 1290 | { |
| 1291 | if (!static_cast<bool>(__y)) |
| 1292 | return false; |
| 1293 | if (!static_cast<bool>(__x)) |
| 1294 | return true; |
| 1295 | return *__x < *__y; |
| 1296 | } |
| 1297 | |
| 1298 | template <class _Tp, class _Up> |
| 1299 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1300 | enable_if_t< |
| 1301 | is_convertible_v<decltype(std::declval<const _Tp&>() > |
| 1302 | std::declval<const _Up&>()), bool>, |
| 1303 | bool |
| 1304 | > |
| 1305 | operator>(const optional<_Tp>& __x, const optional<_Up>& __y) |
| 1306 | { |
| 1307 | if (!static_cast<bool>(__x)) |
| 1308 | return false; |
| 1309 | if (!static_cast<bool>(__y)) |
| 1310 | return true; |
| 1311 | return *__x > *__y; |
| 1312 | } |
| 1313 | |
| 1314 | template <class _Tp, class _Up> |
| 1315 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1316 | enable_if_t< |
| 1317 | is_convertible_v<decltype(std::declval<const _Tp&>() <= |
| 1318 | std::declval<const _Up&>()), bool>, |
| 1319 | bool |
| 1320 | > |
| 1321 | operator<=(const optional<_Tp>& __x, const optional<_Up>& __y) |
| 1322 | { |
| 1323 | if (!static_cast<bool>(__x)) |
| 1324 | return true; |
| 1325 | if (!static_cast<bool>(__y)) |
| 1326 | return false; |
| 1327 | return *__x <= *__y; |
| 1328 | } |
| 1329 | |
| 1330 | template <class _Tp, class _Up> |
| 1331 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1332 | enable_if_t< |
| 1333 | is_convertible_v<decltype(std::declval<const _Tp&>() >= |
| 1334 | std::declval<const _Up&>()), bool>, |
| 1335 | bool |
| 1336 | > |
| 1337 | operator>=(const optional<_Tp>& __x, const optional<_Up>& __y) |
| 1338 | { |
| 1339 | if (!static_cast<bool>(__y)) |
| 1340 | return true; |
| 1341 | if (!static_cast<bool>(__x)) |
| 1342 | return false; |
| 1343 | return *__x >= *__y; |
| 1344 | } |
| 1345 | |
| 1346 | #if _LIBCPP_STD_VER >= 20 |
| 1347 | |
| 1348 | template <class _Tp, three_way_comparable_with<_Tp> _Up> |
| 1349 | _LIBCPP_HIDE_FROM_ABI constexpr compare_three_way_result_t<_Tp, _Up> |
| 1350 | operator<=>(const optional<_Tp>& __x, const optional<_Up>& __y) { |
| 1351 | if (__x && __y) |
| 1352 | return *__x <=> *__y; |
| 1353 | return __x.has_value() <=> __y.has_value(); |
| 1354 | } |
| 1355 | |
| 1356 | #endif // _LIBCPP_STD_VER >= 20 |
| 1357 | |
| 1358 | // Comparisons with nullopt |
| 1359 | template <class _Tp> |
| 1360 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1361 | bool |
| 1362 | operator==(const optional<_Tp>& __x, nullopt_t) noexcept |
| 1363 | { |
| 1364 | return !static_cast<bool>(__x); |
| 1365 | } |
| 1366 | |
| 1367 | #if _LIBCPP_STD_VER <= 17 |
| 1368 | |
| 1369 | template <class _Tp> |
| 1370 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1371 | bool |
| 1372 | operator==(nullopt_t, const optional<_Tp>& __x) noexcept |
| 1373 | { |
| 1374 | return !static_cast<bool>(__x); |
| 1375 | } |
| 1376 | |
| 1377 | template <class _Tp> |
| 1378 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1379 | bool |
| 1380 | operator!=(const optional<_Tp>& __x, nullopt_t) noexcept |
| 1381 | { |
| 1382 | return static_cast<bool>(__x); |
| 1383 | } |
| 1384 | |
| 1385 | template <class _Tp> |
| 1386 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1387 | bool |
| 1388 | operator!=(nullopt_t, const optional<_Tp>& __x) noexcept |
| 1389 | { |
| 1390 | return static_cast<bool>(__x); |
| 1391 | } |
| 1392 | |
| 1393 | template <class _Tp> |
| 1394 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1395 | bool |
| 1396 | operator<(const optional<_Tp>&, nullopt_t) noexcept |
| 1397 | { |
| 1398 | return false; |
| 1399 | } |
| 1400 | |
| 1401 | template <class _Tp> |
| 1402 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1403 | bool |
| 1404 | operator<(nullopt_t, const optional<_Tp>& __x) noexcept |
| 1405 | { |
| 1406 | return static_cast<bool>(__x); |
| 1407 | } |
| 1408 | |
| 1409 | template <class _Tp> |
| 1410 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1411 | bool |
| 1412 | operator<=(const optional<_Tp>& __x, nullopt_t) noexcept |
| 1413 | { |
| 1414 | return !static_cast<bool>(__x); |
| 1415 | } |
| 1416 | |
| 1417 | template <class _Tp> |
| 1418 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1419 | bool |
| 1420 | operator<=(nullopt_t, const optional<_Tp>&) noexcept |
| 1421 | { |
| 1422 | return true; |
| 1423 | } |
| 1424 | |
| 1425 | template <class _Tp> |
| 1426 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1427 | bool |
| 1428 | operator>(const optional<_Tp>& __x, nullopt_t) noexcept |
| 1429 | { |
| 1430 | return static_cast<bool>(__x); |
| 1431 | } |
| 1432 | |
| 1433 | template <class _Tp> |
| 1434 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1435 | bool |
| 1436 | operator>(nullopt_t, const optional<_Tp>&) noexcept |
| 1437 | { |
| 1438 | return false; |
| 1439 | } |
| 1440 | |
| 1441 | template <class _Tp> |
| 1442 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1443 | bool |
| 1444 | operator>=(const optional<_Tp>&, nullopt_t) noexcept |
| 1445 | { |
| 1446 | return true; |
| 1447 | } |
| 1448 | |
| 1449 | template <class _Tp> |
| 1450 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1451 | bool |
| 1452 | operator>=(nullopt_t, const optional<_Tp>& __x) noexcept |
| 1453 | { |
| 1454 | return !static_cast<bool>(__x); |
| 1455 | } |
| 1456 | |
| 1457 | #else // _LIBCPP_STD_VER <= 17 |
| 1458 | |
| 1459 | template <class _Tp> |
| 1460 | _LIBCPP_HIDE_FROM_ABI constexpr strong_ordering operator<=>(const optional<_Tp>& __x, nullopt_t) noexcept { |
| 1461 | return __x.has_value() <=> false; |
| 1462 | } |
| 1463 | |
| 1464 | #endif // _LIBCPP_STD_VER <= 17 |
| 1465 | |
| 1466 | // Comparisons with T |
| 1467 | template <class _Tp, class _Up> |
| 1468 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1469 | enable_if_t< |
| 1470 | is_convertible_v<decltype(std::declval<const _Tp&>() == |
| 1471 | std::declval<const _Up&>()), bool>, |
| 1472 | bool |
| 1473 | > |
| 1474 | operator==(const optional<_Tp>& __x, const _Up& __v) |
| 1475 | { |
| 1476 | return static_cast<bool>(__x) ? *__x == __v : false; |
| 1477 | } |
| 1478 | |
| 1479 | template <class _Tp, class _Up> |
| 1480 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1481 | enable_if_t< |
| 1482 | is_convertible_v<decltype(std::declval<const _Tp&>() == |
| 1483 | std::declval<const _Up&>()), bool>, |
| 1484 | bool |
| 1485 | > |
| 1486 | operator==(const _Tp& __v, const optional<_Up>& __x) |
| 1487 | { |
| 1488 | return static_cast<bool>(__x) ? __v == *__x : false; |
| 1489 | } |
| 1490 | |
| 1491 | template <class _Tp, class _Up> |
| 1492 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1493 | enable_if_t< |
| 1494 | is_convertible_v<decltype(std::declval<const _Tp&>() != |
| 1495 | std::declval<const _Up&>()), bool>, |
| 1496 | bool |
| 1497 | > |
| 1498 | operator!=(const optional<_Tp>& __x, const _Up& __v) |
| 1499 | { |
| 1500 | return static_cast<bool>(__x) ? *__x != __v : true; |
| 1501 | } |
| 1502 | |
| 1503 | template <class _Tp, class _Up> |
| 1504 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1505 | enable_if_t< |
| 1506 | is_convertible_v<decltype(std::declval<const _Tp&>() != |
| 1507 | std::declval<const _Up&>()), bool>, |
| 1508 | bool |
| 1509 | > |
| 1510 | operator!=(const _Tp& __v, const optional<_Up>& __x) |
| 1511 | { |
| 1512 | return static_cast<bool>(__x) ? __v != *__x : true; |
| 1513 | } |
| 1514 | |
| 1515 | template <class _Tp, class _Up> |
| 1516 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1517 | enable_if_t< |
| 1518 | is_convertible_v<decltype(std::declval<const _Tp&>() < |
| 1519 | std::declval<const _Up&>()), bool>, |
| 1520 | bool |
| 1521 | > |
| 1522 | operator<(const optional<_Tp>& __x, const _Up& __v) |
| 1523 | { |
| 1524 | return static_cast<bool>(__x) ? *__x < __v : true; |
| 1525 | } |
| 1526 | |
| 1527 | template <class _Tp, class _Up> |
| 1528 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1529 | enable_if_t< |
| 1530 | is_convertible_v<decltype(std::declval<const _Tp&>() < |
| 1531 | std::declval<const _Up&>()), bool>, |
| 1532 | bool |
| 1533 | > |
| 1534 | operator<(const _Tp& __v, const optional<_Up>& __x) |
| 1535 | { |
| 1536 | return static_cast<bool>(__x) ? __v < *__x : false; |
| 1537 | } |
| 1538 | |
| 1539 | template <class _Tp, class _Up> |
| 1540 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1541 | enable_if_t< |
| 1542 | is_convertible_v<decltype(std::declval<const _Tp&>() <= |
| 1543 | std::declval<const _Up&>()), bool>, |
| 1544 | bool |
| 1545 | > |
| 1546 | operator<=(const optional<_Tp>& __x, const _Up& __v) |
| 1547 | { |
| 1548 | return static_cast<bool>(__x) ? *__x <= __v : true; |
| 1549 | } |
| 1550 | |
| 1551 | template <class _Tp, class _Up> |
| 1552 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1553 | enable_if_t< |
| 1554 | is_convertible_v<decltype(std::declval<const _Tp&>() <= |
| 1555 | std::declval<const _Up&>()), bool>, |
| 1556 | bool |
| 1557 | > |
| 1558 | operator<=(const _Tp& __v, const optional<_Up>& __x) |
| 1559 | { |
| 1560 | return static_cast<bool>(__x) ? __v <= *__x : false; |
| 1561 | } |
| 1562 | |
| 1563 | template <class _Tp, class _Up> |
| 1564 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1565 | enable_if_t< |
| 1566 | is_convertible_v<decltype(std::declval<const _Tp&>() > |
| 1567 | std::declval<const _Up&>()), bool>, |
| 1568 | bool |
| 1569 | > |
| 1570 | operator>(const optional<_Tp>& __x, const _Up& __v) |
| 1571 | { |
| 1572 | return static_cast<bool>(__x) ? *__x > __v : false; |
| 1573 | } |
| 1574 | |
| 1575 | template <class _Tp, class _Up> |
| 1576 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1577 | enable_if_t< |
| 1578 | is_convertible_v<decltype(std::declval<const _Tp&>() > |
| 1579 | std::declval<const _Up&>()), bool>, |
| 1580 | bool |
| 1581 | > |
| 1582 | operator>(const _Tp& __v, const optional<_Up>& __x) |
| 1583 | { |
| 1584 | return static_cast<bool>(__x) ? __v > *__x : true; |
| 1585 | } |
| 1586 | |
| 1587 | template <class _Tp, class _Up> |
| 1588 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1589 | enable_if_t< |
| 1590 | is_convertible_v<decltype(std::declval<const _Tp&>() >= |
| 1591 | std::declval<const _Up&>()), bool>, |
| 1592 | bool |
| 1593 | > |
| 1594 | operator>=(const optional<_Tp>& __x, const _Up& __v) |
| 1595 | { |
| 1596 | return static_cast<bool>(__x) ? *__x >= __v : false; |
| 1597 | } |
| 1598 | |
| 1599 | template <class _Tp, class _Up> |
| 1600 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1601 | enable_if_t< |
| 1602 | is_convertible_v<decltype(std::declval<const _Tp&>() >= |
| 1603 | std::declval<const _Up&>()), bool>, |
| 1604 | bool |
| 1605 | > |
| 1606 | operator>=(const _Tp& __v, const optional<_Up>& __x) |
| 1607 | { |
| 1608 | return static_cast<bool>(__x) ? __v >= *__x : true; |
| 1609 | } |
| 1610 | |
| 1611 | #if _LIBCPP_STD_VER >= 20 |
| 1612 | |
| 1613 | template <class _Tp, class _Up> |
| 1614 | requires(!__is_derived_from_optional<_Up>) && three_way_comparable_with<_Tp, _Up> |
| 1615 | _LIBCPP_HIDE_FROM_ABI constexpr compare_three_way_result_t<_Tp, _Up> |
| 1616 | operator<=>(const optional<_Tp>& __x, const _Up& __v) { |
| 1617 | return __x.has_value() ? *__x <=> __v : strong_ordering::less; |
| 1618 | } |
| 1619 | |
| 1620 | #endif // _LIBCPP_STD_VER >= 20 |
| 1621 | |
| 1622 | |
| 1623 | template <class _Tp> |
| 1624 | inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| 1625 | enable_if_t< |
| 1626 | is_move_constructible_v<_Tp> && is_swappable_v<_Tp>, |
| 1627 | void |
| 1628 | > |
| 1629 | swap(optional<_Tp>& __x, optional<_Tp>& __y) noexcept(noexcept(__x.swap(__y))) |
| 1630 | { |
| 1631 | __x.swap(__y); |
| 1632 | } |
| 1633 | |
| 1634 | template <class _Tp> |
| 1635 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1636 | optional<decay_t<_Tp>> make_optional(_Tp&& __v) |
| 1637 | { |
| 1638 | return optional<decay_t<_Tp>>(_VSTD::forward<_Tp>(__v)); |
| 1639 | } |
| 1640 | |
| 1641 | template <class _Tp, class... _Args> |
| 1642 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1643 | optional<_Tp> make_optional(_Args&&... __args) |
| 1644 | { |
| 1645 | return optional<_Tp>(in_place, _VSTD::forward<_Args>(__args)...); |
| 1646 | } |
| 1647 | |
| 1648 | template <class _Tp, class _Up, class... _Args> |
| 1649 | _LIBCPP_INLINE_VISIBILITY constexpr |
| 1650 | optional<_Tp> make_optional(initializer_list<_Up> __il, _Args&&... __args) |
| 1651 | { |
| 1652 | return optional<_Tp>(in_place, __il, _VSTD::forward<_Args>(__args)...); |
| 1653 | } |
| 1654 | |
| 1655 | template <class _Tp> |
| 1656 | struct _LIBCPP_TEMPLATE_VIS hash< |
| 1657 | __enable_hash_helper<optional<_Tp>, remove_const_t<_Tp>> |
| 1658 | > |
| 1659 | { |
| 1660 | #if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) |
| 1661 | _LIBCPP_DEPRECATED_IN_CXX17 typedef optional<_Tp> argument_type; |
| 1662 | _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; |
| 1663 | #endif |
| 1664 | |
| 1665 | _LIBCPP_INLINE_VISIBILITY |
| 1666 | size_t operator()(const optional<_Tp>& __opt) const |
| 1667 | { |
| 1668 | return static_cast<bool>(__opt) ? hash<remove_const_t<_Tp>>()(*__opt) : 0; |
| 1669 | } |
| 1670 | }; |
| 1671 | |
| 1672 | _LIBCPP_END_NAMESPACE_STD |
| 1673 | |
| 1674 | #endif // _LIBCPP_STD_VER >= 17 |
| 1675 | |
| 1676 | _LIBCPP_POP_MACROS |
| 1677 | |
| 1678 | #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 |
| 1679 | # include <atomic> |
| 1680 | # include <climits> |
| 1681 | # include <concepts> |
| 1682 | # include <ctime> |
| 1683 | # include <iterator> |
| 1684 | # include <memory> |
| 1685 | # include <ratio> |
| 1686 | # include <tuple> |
| 1687 | # include <type_traits> |
| 1688 | # include <typeinfo> |
| 1689 | # include <utility> |
| 1690 | # include <variant> |
| 1691 | #endif |
| 1692 | |
| 1693 | #endif // _LIBCPP_OPTIONAL |