| Line | Branch | Decision | Exec | Source |
|---|---|---|---|---|
| 1 | /* Copyright 2023 Jack A Bernard Jr. | |||
| 2 | * | |||
| 3 | * Licensed under the Apache License, Version 2.0 (the License); | |||
| 4 | * you may not use this file except in compliance with the License. | |||
| 5 | * You may obtain a copy of the License at | |||
| 6 | * | |||
| 7 | * http://www.apache.org/licenses/LICENSE-2.0 | |||
| 8 | * | |||
| 9 | * Unless required by applicable law or agreed to in writing, software | |||
| 10 | * distributed under the License is distributed on an AS IS BASIS, | |||
| 11 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |||
| 12 | * See the License for the specific language governing permissions and | |||
| 13 | * limitations under the License. | |||
| 14 | */ | |||
| 15 | ||||
| 16 | #ifndef SUMTY_DETAIL_VARIANT_IMPL_HPP | |||
| 17 | #define SUMTY_DETAIL_VARIANT_IMPL_HPP | |||
| 18 | ||||
| 19 | #include "sumty/detail/auto_union.hpp" | |||
| 20 | #include "sumty/detail/traits.hpp" | |||
| 21 | #include "sumty/detail/utils.hpp" | |||
| 22 | #include "sumty/utils.hpp" | |||
| 23 | ||||
| 24 | #include <cstddef> | |||
| 25 | #include <memory> | |||
| 26 | #include <new> | |||
| 27 | #include <type_traits> | |||
| 28 | #include <utility> | |||
| 29 | ||||
| 30 | // IWYU pragma: no_include <string> | |||
| 31 | // IWYU pragma: no_include <variant> | |||
| 32 | // IWYU pragma: no_include <unordered_map> | |||
| 33 | ||||
| 34 | #ifdef _MSC_VER | |||
| 35 | #pragma warning(push) | |||
| 36 | #pragma warning(disable : 4702) | |||
| 37 | #endif | |||
| 38 | ||||
| 39 | namespace sumty::detail { | |||
| 40 | ||||
| 41 | struct uninit_t {}; | |||
| 42 | ||||
| 43 | static inline constexpr uninit_t uninit{}; | |||
| 44 | ||||
| 45 | template <typename Enable, typename... T> | |||
| 46 | class variant_impl { | |||
| 47 | private: | |||
| 48 | using discrim_t = discriminant_t<sizeof...(T)>; | |||
| 49 | ||||
| 50 | SUMTY_NO_UNIQ_ADDR auto_union<T...> data_; | |||
| 51 | discrim_t discrim_{}; | |||
| 52 | ||||
| 53 | template <size_t I> | |||
| 54 | 30 | constexpr void copy_construct(const auto_union<T...>& data) { | ||
| 55 | if constexpr (I < sizeof...(T)) { | |||
| 56 |
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30 | if (discrim_ == static_cast<discrim_t>(I)) { |
| 57 | if constexpr (std::is_void_v<select_t<I, T...>>) { | |||
| 58 | 6 | data_.template construct<I>(); | ||
| 59 | } else { | |||
| 60 | 14 | data_.template construct<I>(data.template get<I>()); | ||
| 61 | } | |||
| 62 | } else { | |||
| 63 | 10 | copy_construct<I + 1>(data); | ||
| 64 | } | |||
| 65 | } | |||
| 66 | 30 | } | ||
| 67 | ||||
| 68 | template <size_t I> | |||
| 69 | 36 | constexpr void move_construct(auto_union<T...>& data) noexcept( | ||
| 70 | (true && ... && traits<T>::is_nothrow_move_constructible)) { | |||
| 71 | if constexpr (I < sizeof...(T)) { | |||
| 72 |
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36 | if (discrim_ == static_cast<discrim_t>(I)) { |
| 73 | if constexpr (std::is_void_v<select_t<I, T...>>) { | |||
| 74 | ✗ | data_.template construct<I>(); | ||
| 75 | } else if constexpr (std::is_lvalue_reference_v<select_t<I, T...>>) { | |||
| 76 | 8 | data_.template construct<I>(data.template get<I>()); | ||
| 77 | } else { | |||
| 78 | 12 | data_.template construct<I>(std::move(data.template get<I>())); | ||
| 79 | } | |||
| 80 | } else { | |||
| 81 | 16 | move_construct<I + 1>(data); | ||
| 82 | } | |||
| 83 | } | |||
| 84 | 36 | } | ||
| 85 | ||||
| 86 | template <size_t I> | |||
| 87 | 862 | constexpr void destroy() noexcept((true && ... && traits<T>::is_nothrow_destructible)) { | ||
| 88 | if constexpr (I < sizeof...(T)) { | |||
| 89 |
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862 | if (discrim_ == static_cast<discrim_t>(I)) { |
| 90 | 524 | data_.template destroy<I>(); | ||
| 91 | } else { | |||
| 92 | 338 | destroy<I + 1>(); | ||
| 93 | } | |||
| 94 | } | |||
| 95 | 862 | } | ||
| 96 | ||||
| 97 | template <size_t I> | |||
| 98 | ✗ | constexpr void copy_assign(const auto_union<T...>& data) { | ||
| 99 | if constexpr (I < sizeof...(T)) { | |||
| 100 |
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✗ | if (discrim_ == static_cast<discrim_t>(I)) { | |
| 101 | if constexpr (std::is_void_v<select_t<I, T...>>) { | |||
| 102 | ✗ | data_.template construct<I>(); | ||
| 103 | } else if constexpr (std::is_lvalue_reference_v<select_t<I, T...>>) { | |||
| 104 | ✗ | data_.template construct<I>(data.template get<I>()); | ||
| 105 | } else { | |||
| 106 | ✗ | data_.template get<I>() = data.template get<I>(); | ||
| 107 | } | |||
| 108 | } else { | |||
| 109 | ✗ | copy_assign<I + 1>(data); | ||
| 110 | } | |||
| 111 | } | |||
| 112 | ✗ | } | ||
| 113 | ||||
| 114 | template <size_t I> | |||
| 115 | 34 | constexpr void move_assign(auto_union<T...>& data) noexcept( | ||
| 116 | (true && ... && traits<T>::is_nothrow_move_assignable)) { | |||
| 117 | if constexpr (I < sizeof...(T)) { | |||
| 118 |
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34 | if (discrim_ == static_cast<discrim_t>(I)) { |
| 119 | if constexpr (std::is_void_v<select_t<I, T...>>) { | |||
| 120 | 2 | data_.template construct<I>(); | ||
| 121 | } else if constexpr (std::is_lvalue_reference_v<select_t<I, T...>>) { | |||
| 122 | 6 | data_.template construct<I>(data.template get<I>()); | ||
| 123 | } else { | |||
| 124 | 8 | data_.template get<I>() = std::move(data.template get<I>()); | ||
| 125 | } | |||
| 126 | } else { | |||
| 127 | 18 | move_assign<I + 1>(data); | ||
| 128 | } | |||
| 129 | } | |||
| 130 | 34 | } | ||
| 131 | ||||
| 132 | template <size_t I> | |||
| 133 | 14 | constexpr void same_swap(auto_union<T...>& data) noexcept( | ||
| 134 | (true && ... && traits<T>::is_nothrow_swappable)) { | |||
| 135 | if constexpr (I < sizeof...(T)) { | |||
| 136 |
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14 | if (discrim_ == static_cast<discrim_t>(I)) { |
| 137 | if constexpr (std::is_lvalue_reference_v<select_t<I, T...>>) { | |||
| 138 | ✗ | auto* tmp = &data.template get<I>(); | ||
| 139 | ✗ | data.template construct<I>(data_.template get<I>()); | ||
| 140 | ✗ | data_.template construct<I>(*tmp); | ||
| 141 | } else if constexpr (!std::is_void_v<select_t<I, T...>>) { | |||
| 142 | using std::swap; | |||
| 143 | 4 | swap(data_.template get<I>(), data.template get<I>()); | ||
| 144 | } | |||
| 145 | } else { | |||
| 146 | 6 | same_swap<I + 1>(data); | ||
| 147 | } | |||
| 148 | } | |||
| 149 | 14 | } | ||
| 150 | ||||
| 151 | template <size_t I, size_t J> | |||
| 152 | 6 | constexpr void diff_swap_impl(variant_impl& other) noexcept(( | ||
| 153 | true && ... && | |||
| 154 | (traits<T>::is_nothrow_move_constructible && traits<T>::is_nothrow_destructible))) { | |||
| 155 | 6 | std::swap(discrim_, other.discrim_); | ||
| 156 | if constexpr (std::is_void_v<select_t<I, T...>>) { | |||
| 157 | if constexpr (std::is_void_v<select_t<J, T...>>) { | |||
| 158 | ✗ | return; | ||
| 159 | } else if constexpr (std::is_lvalue_reference_v<select_t<J, T...>>) { | |||
| 160 | ✗ | data_.template construct<J>(other.data_.template get<J>()); | ||
| 161 | ✗ | other.data_.template destroy<J>(); | ||
| 162 | ✗ | other.data_.template construct<I>(); | ||
| 163 | } else { | |||
| 164 | 2 | data_.template construct<J>(std::move(other.data_.template get<J>())); | ||
| 165 | 2 | other.data_.template destroy<J>(); | ||
| 166 | 2 | other.data_.template construct<I>(); | ||
| 167 | } | |||
| 168 | } else if constexpr (std::is_lvalue_reference_v<select_t<I, T...>>) { | |||
| 169 | if constexpr (std::is_void_v<select_t<J, T...>>) { | |||
| 170 | 2 | other.data_.template construct<I>(data_.template get<I>()); | ||
| 171 | 2 | data_.template destroy<I>(); | ||
| 172 | 2 | data_.template construct<J>(); | ||
| 173 | } else if constexpr (std::is_lvalue_reference_v<select_t<J, T...>>) { | |||
| 174 | ✗ | auto& tmp = other.data_.template get<J>(); | ||
| 175 | ✗ | other.data_.template construct<I>(data_.template get<I>()); | ||
| 176 | ✗ | data_.template construct<J>(tmp); | ||
| 177 | } else { | |||
| 178 | ✗ | auto& tmp = data_.template get<I>(); | ||
| 179 | ✗ | data_.template construct<J>(std::move(other.data_.template get<J>())); | ||
| 180 | ✗ | other.data_.template destroy<J>(); | ||
| 181 | ✗ | other.data_.template construct<I>(tmp); | ||
| 182 | } | |||
| 183 | } else { | |||
| 184 | if constexpr (std::is_void_v<select_t<J, T...>>) { | |||
| 185 | ✗ | other.data_.template construct<I>(std::move(data_.template get<I>())); | ||
| 186 | ✗ | data_.template destroy<I>(); | ||
| 187 | ✗ | data_.template construct<J>(); | ||
| 188 | } else if constexpr (std::is_lvalue_reference_v<select_t<J, T...>>) { | |||
| 189 | 2 | auto& tmp = other.data_.template get<J>(); | ||
| 190 | 2 | other.data_.template construct<I>(std::move(data_.template get<I>())); | ||
| 191 | 2 | data_.template destroy<I>(); | ||
| 192 | 2 | data_.template construct<J>(tmp); | ||
| 193 | } else { | |||
| 194 | ✗ | auto&& tmp = std::move(other.data_.template get<J>()); | ||
| 195 | ✗ | other.data_.template destroy<J>(); | ||
| 196 | ✗ | other.data_.template construct<I>(std::move(data_.template get<I>())); | ||
| 197 | ✗ | data_.template destroy<I>(); | ||
| 198 | ✗ | data_.template construct<J>(std::move(tmp)); | ||
| 199 | } | |||
| 200 | } | |||
| 201 | 6 | } | ||
| 202 | ||||
| 203 | template <size_t I, size_t J> | |||
| 204 | 10 | constexpr void diff_swap_nested(variant_impl& other) noexcept(( | ||
| 205 | true && ... && | |||
| 206 | (traits<T>::is_nothrow_move_constructible && traits<T>::is_nothrow_destructible))) { | |||
| 207 | if constexpr (J < sizeof...(T)) { | |||
| 208 |
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10 | if (other.discrim_ == static_cast<discrim_t>(J)) { |
| 209 | 6 | diff_swap_impl<I, J>(other); | ||
| 210 | } else { | |||
| 211 | 4 | diff_swap_nested<I, J + 1>(other); | ||
| 212 | } | |||
| 213 | } | |||
| 214 | 10 | } | ||
| 215 | ||||
| 216 | template <size_t I> | |||
| 217 | 12 | constexpr void diff_swap(variant_impl& other) noexcept(( | ||
| 218 | true && ... && | |||
| 219 | (traits<T>::is_nothrow_move_constructible && traits<T>::is_nothrow_destructible))) { | |||
| 220 | if constexpr (I < sizeof...(T)) { | |||
| 221 |
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12 | if (discrim_ == static_cast<discrim_t>(I)) { |
| 222 | 6 | diff_swap_nested<I, 0>(other); | ||
| 223 | } else { | |||
| 224 | 6 | diff_swap<I + 1>(other); | ||
| 225 | } | |||
| 226 | } | |||
| 227 | 12 | } | ||
| 228 | ||||
| 229 | public: | |||
| 230 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 231 | 54 | constexpr variant_impl([[maybe_unused]] uninit_t tag) noexcept {} | ||
| 232 | ||||
| 233 | 146 | constexpr variant_impl() noexcept( | ||
| 234 | traits<first_t<T...>>::is_nothrow_default_constructible) | |||
| 235 | 146 | : variant_impl(std::in_place_index<0>) {} | ||
| 236 | ||||
| 237 | 18 | constexpr variant_impl(const variant_impl& other) : discrim_(other.discrim_) { | ||
| 238 |
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18 | copy_construct<0>(other.data_); | |
| 239 | 18 | } | ||
| 240 | ||||
| 241 | 1 | constexpr variant_impl(variant_impl&& other) noexcept( | ||
| 242 | (true && ... && traits<T>::is_nothrow_move_constructible)) | |||
| 243 | 1 | : discrim_(other.discrim_) { | ||
| 244 | 1 | move_construct<0>(other.data_); | ||
| 245 | 1 | } | ||
| 246 | ||||
| 247 | template <size_t I, typename... Args> | |||
| 248 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 249 | 312 | constexpr explicit(sizeof...(Args) == 0) variant_impl( | ||
| 250 | [[maybe_unused]] std::in_place_index_t<I> inplace, | |||
| 251 | Args&&... args) noexcept(traits<select_t<I, T...>>:: | |||
| 252 | template is_nothrow_constructible<Args...>) | |||
| 253 | 312 | : discrim_(static_cast<discrim_t>(I)) { | ||
| 254 |
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312 | data_.template construct<I>(std::forward<Args>(args)...); | |
| 255 | 312 | } | ||
| 256 | ||||
| 257 | 386 | constexpr ~variant_impl() noexcept((true && ... && | ||
| 258 | traits<T>::is_nothrow_destructible)) { | |||
| 259 | 386 | destroy<0>(); | ||
| 260 | 386 | } | ||
| 261 | ||||
| 262 | 1 | constexpr variant_impl& operator=(const variant_impl& rhs) { | ||
| 263 |
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1 | if (this != &rhs) { |
| 264 |
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1 | if (discrim_ == rhs.discrim_) { |
| 265 | ✗ | copy_assign<0>(rhs.data_); | ||
| 266 | } else { | |||
| 267 | 1 | destroy<0>(); | ||
| 268 | 1 | discrim_ = rhs.discrim_; | ||
| 269 | 1 | copy_construct<0>(rhs.data_); | ||
| 270 | } | |||
| 271 | } | |||
| 272 | 1 | return *this; | ||
| 273 | } | |||
| 274 | ||||
| 275 | 34 | constexpr variant_impl& operator=(variant_impl&& rhs) noexcept(( | ||
| 276 | true && ... && | |||
| 277 | (traits<T>::is_nothrow_move_assignable && | |||
| 278 | traits<T>::is_nothrow_move_constructible && traits<T>::is_nothrow_destructible))) { | |||
| 279 |
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34 | if (discrim_ == rhs.discrim_) { |
| 280 | 16 | move_assign<0>(rhs.data_); | ||
| 281 | } else { | |||
| 282 | 18 | destroy<0>(); | ||
| 283 | 18 | discrim_ = rhs.discrim_; | ||
| 284 | 18 | move_construct<0>(rhs.data_); | ||
| 285 | } | |||
| 286 | 34 | return *this; | ||
| 287 | } | |||
| 288 | ||||
| 289 | 1036 | [[nodiscard]] constexpr size_t index() const noexcept { | ||
| 290 | 1036 | return static_cast<size_t>(discrim_); | ||
| 291 | } | |||
| 292 | ||||
| 293 | template <size_t I> | |||
| 294 | 454 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::reference get() & noexcept { | ||
| 295 | 454 | return data_.template get<I>(); | ||
| 296 | } | |||
| 297 | ||||
| 298 | template <size_t I> | |||
| 299 | 214 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::const_reference get() | ||
| 300 | const& noexcept { | |||
| 301 | 214 | return data_.template get<I>(); | ||
| 302 | } | |||
| 303 | ||||
| 304 | template <size_t I> | |||
| 305 | 13 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::rvalue_reference get() && { | ||
| 306 | if constexpr (std::is_void_v<select_t<I, T...>>) { | |||
| 307 | return; | |||
| 308 | } else if constexpr (std::is_lvalue_reference_v<select_t<I, T...>>) { | |||
| 309 | 6 | return data_.template get<I>(); | ||
| 310 | } else { | |||
| 311 | 7 | return std::move(data_.template get<I>()); | ||
| 312 | } | |||
| 313 | } | |||
| 314 | ||||
| 315 | template <size_t I> | |||
| 316 | 14 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::const_rvalue_reference get() | ||
| 317 | const&& { | |||
| 318 | if constexpr (std::is_void_v<select_t<I, T...>>) { | |||
| 319 | return; | |||
| 320 | } else if constexpr (std::is_lvalue_reference_v<select_t<I, T...>>) { | |||
| 321 | 6 | return data_.template get<I>(); | ||
| 322 | } else { | |||
| 323 | 8 | return std::move(data_.template get<I>()); | ||
| 324 | } | |||
| 325 | } | |||
| 326 | ||||
| 327 | template <size_t I> | |||
| 328 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::pointer ptr() noexcept { | |||
| 329 | if constexpr (!std::is_void_v<select_t<I, T...>>) { | |||
| 330 | return &data_.template get<I>(); | |||
| 331 | } else { | |||
| 332 | return; | |||
| 333 | } | |||
| 334 | } | |||
| 335 | ||||
| 336 | template <size_t I> | |||
| 337 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::const_pointer ptr() | |||
| 338 | const noexcept { | |||
| 339 | if constexpr (!std::is_void_v<select_t<I, T...>>) { | |||
| 340 | return &data_.template get<I>(); | |||
| 341 | } else { | |||
| 342 | return; | |||
| 343 | } | |||
| 344 | } | |||
| 345 | ||||
| 346 | template <size_t I, typename... Args> | |||
| 347 | 118 | constexpr void emplace(Args&&... args) { | ||
| 348 | 118 | destroy<0>(); | ||
| 349 | 118 | data_.template construct<I>(std::forward<Args>(args)...); | ||
| 350 | 118 | discrim_ = static_cast<discrim_t>(I); | ||
| 351 | 118 | } | ||
| 352 | ||||
| 353 | template <size_t I, typename... Args> | |||
| 354 | 54 | constexpr void uninit_emplace(Args&&... args) { | ||
| 355 | 54 | data_.template construct<I>(std::forward<Args>(args)...); | ||
| 356 | 54 | discrim_ = static_cast<discrim_t>(I); | ||
| 357 | 54 | } | ||
| 358 | ||||
| 359 | 7 | constexpr void swap(variant_impl& other) noexcept( | ||
| 360 | (true && ... && | |||
| 361 | (traits<T>::is_nothrow_swappable && traits<T>::is_nothrow_move_constructible && | |||
| 362 | traits<T>::is_nothrow_destructible))) { | |||
| 363 |
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7 | if (discrim_ == other.discrim_) { |
| 364 | 4 | same_swap<0>(other.data_); | ||
| 365 | } else { | |||
| 366 | 3 | diff_swap<0>(other); | ||
| 367 | } | |||
| 368 | 7 | } | ||
| 369 | }; | |||
| 370 | ||||
| 371 | template <> | |||
| 372 | class variant_impl<void> {}; | |||
| 373 | ||||
| 374 | template <typename... T> | |||
| 375 | struct empty_tuple; | |||
| 376 | ||||
| 377 | template <> | |||
| 378 | struct empty_tuple<> {}; | |||
| 379 | ||||
| 380 | template <typename... TN> | |||
| 381 | struct empty_tuple<void, TN...> : empty_tuple<TN...> { | |||
| 382 | template <size_t I> | |||
| 383 | constexpr typename traits<select_t<I, void, TN...>>::reference get() noexcept { | |||
| 384 | if constexpr (I != 0) { | |||
| 385 | static_cast<empty_tuple<TN...>*>(this)->template get<I - 1>(); | |||
| 386 | } | |||
| 387 | } | |||
| 388 | ||||
| 389 | template <size_t I> | |||
| 390 | constexpr typename traits<select_t<I, void, TN...>>::const_reference get() | |||
| 391 | const noexcept { | |||
| 392 | if constexpr (I != 0) { | |||
| 393 | static_cast<const empty_tuple<TN...>*>(this)->template get<I - 1>(); | |||
| 394 | } | |||
| 395 | } | |||
| 396 | }; | |||
| 397 | ||||
| 398 | template <typename T0, typename... TN> | |||
| 399 | requires(std::is_base_of_v<never, std::remove_cvref_t<T0>>) | |||
| 400 | struct empty_tuple<T0, TN...> : empty_tuple<TN...> { | |||
| 401 | template <size_t I> | |||
| 402 | // NOLINTNEXTLINE(bugprone-exception-escape) | |||
| 403 | constexpr typename traits<select_t<I, never, TN...>>::reference get() noexcept { | |||
| 404 | if constexpr (I == 0) { | |||
| 405 | if (std::is_constant_evaluated()) { | |||
| 406 | throw 0; // NOLINT(hicpp-exception-baseclass) | |||
| 407 | } else { | |||
| 408 | void* ptr = nullptr; | |||
| 409 | // NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast) | |||
| 410 | return *reinterpret_cast<never*>(ptr); | |||
| 411 | } | |||
| 412 | } else { | |||
| 413 | static_cast<empty_tuple<TN...>*>(this)->template get<I - 1>(); | |||
| 414 | } | |||
| 415 | } | |||
| 416 | ||||
| 417 | template <size_t I> | |||
| 418 | // NOLINTNEXTLINE(bugprone-exception-escape) | |||
| 419 | constexpr typename traits<select_t<I, never, TN...>>::const_reference get() | |||
| 420 | const noexcept { | |||
| 421 | if constexpr (I == 0) { | |||
| 422 | if (std::is_constant_evaluated()) { | |||
| 423 | throw 0; // NOLINT(hicpp-exception-baseclass) | |||
| 424 | } else { | |||
| 425 | const void* ptr = nullptr; | |||
| 426 | // NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast) | |||
| 427 | return *reinterpret_cast<const never*>(ptr); | |||
| 428 | } | |||
| 429 | } else { | |||
| 430 | static_cast<const empty_tuple<TN...>*>(this)->template get<I - 1>(); | |||
| 431 | } | |||
| 432 | } | |||
| 433 | }; | |||
| 434 | ||||
| 435 | template <typename T0, typename... TN> | |||
| 436 | requires(!std::is_void_v<T0> && !std::is_base_of_v<never, std::remove_cvref_t<T0>>) | |||
| 437 | struct empty_tuple<T0, TN...> : empty_tuple<TN...> { | |||
| 438 | // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables) | |||
| 439 | static inline T0 head_{}; | |||
| 440 | ||||
| 441 | template <size_t I> | |||
| 442 | constexpr typename traits<select_t<I, T0, TN...>>::reference get() noexcept { | |||
| 443 | if constexpr (I == 0) { | |||
| 444 | return head_; | |||
| 445 | } else { | |||
| 446 | static_cast<empty_tuple<TN...>*>(this)->template get<I - 1>(); | |||
| 447 | } | |||
| 448 | } | |||
| 449 | ||||
| 450 | template <size_t I> | |||
| 451 | constexpr typename traits<select_t<I, T0, TN...>>::const_reference get() | |||
| 452 | const noexcept { | |||
| 453 | if constexpr (I == 0) { | |||
| 454 | return head_; | |||
| 455 | } else { | |||
| 456 | static_cast<const empty_tuple<TN...>*>(this)->template get<I - 1>(); | |||
| 457 | } | |||
| 458 | } | |||
| 459 | }; | |||
| 460 | ||||
| 461 | template <typename T> | |||
| 462 | concept void_or_empty_or_never = std::is_void_v<T> || is_sumty_empty_v<T> || | |||
| 463 | std::is_base_of_v<never, std::remove_cvref_t<T>>; | |||
| 464 | ||||
| 465 | template <void_or_empty_or_never... T> | |||
| 466 | class variant_impl< | |||
| 467 | std::enable_if_t<(sizeof...(T) > 1) && | |||
| 468 | !std::is_base_of_v<never, std::remove_cvref_t<last_t<T...>>> && | |||
| 469 | !std::is_base_of_v<never, std::remove_cvref_t<select_t<0, T...>>>>, | |||
| 470 | T...> { | |||
| 471 | private: | |||
| 472 | using discrim_t = discriminant_t<sizeof...(T)>; | |||
| 473 | ||||
| 474 | discrim_t discrim_{}; | |||
| 475 | SUMTY_NO_UNIQ_ADDR empty_tuple<T...> data_{}; | |||
| 476 | ||||
| 477 | public: | |||
| 478 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 479 | constexpr variant_impl([[maybe_unused]] uninit_t tag) noexcept {} | |||
| 480 | ||||
| 481 | 2 | constexpr variant_impl() noexcept = default; | ||
| 482 | ||||
| 483 | constexpr variant_impl(const variant_impl&) noexcept = default; | |||
| 484 | ||||
| 485 | constexpr variant_impl(variant_impl&&) noexcept = default; | |||
| 486 | ||||
| 487 | template <size_t I, typename... Args> | |||
| 488 | constexpr explicit(sizeof...(Args) == 0) | |||
| 489 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 490 | 10 | variant_impl([[maybe_unused]] std::in_place_index_t<I> inplace, Args&&... args) | ||
| 491 | 10 | : discrim_(static_cast<discrim_t>(I)) { | ||
| 492 | #ifdef _MSC_VER | |||
| 493 | // I don't know why, but MSVC seems to skip the initializer for | |||
| 494 | // discrim_ above, so we manually assign it again here. | |||
| 495 | discrim_ = static_cast<discrim_t>(I); | |||
| 496 | #endif | |||
| 497 | if constexpr (sizeof...(Args) > 0) { | |||
| 498 | std::construct_at(&data_.template get<I>(), std::forward<Args>(args)...); | |||
| 499 | } | |||
| 500 | 10 | } | ||
| 501 | ||||
| 502 | constexpr ~variant_impl() noexcept = default; | |||
| 503 | ||||
| 504 | constexpr variant_impl& operator=(const variant_impl&) = default; | |||
| 505 | ||||
| 506 | constexpr variant_impl& operator=(variant_impl&&) = default; | |||
| 507 | ||||
| 508 | 17 | [[nodiscard]] constexpr size_t index() const noexcept { | ||
| 509 | 17 | return static_cast<size_t>(discrim_); | ||
| 510 | } | |||
| 511 | ||||
| 512 | template <size_t I> | |||
| 513 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::reference get() noexcept { | |||
| 514 | if constexpr (!std::is_void_v<select_t<I, T...>>) { | |||
| 515 | return data_.template get<I>(); | |||
| 516 | } | |||
| 517 | } | |||
| 518 | ||||
| 519 | template <size_t I> | |||
| 520 | 1 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::const_reference get() | ||
| 521 | const noexcept { | |||
| 522 | if constexpr (!std::is_void_v<select_t<I, T...>>) { | |||
| 523 | return data_.template get<I>(); | |||
| 524 | } | |||
| 525 | 1 | } | ||
| 526 | ||||
| 527 | template <size_t I> | |||
| 528 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::pointer ptr() noexcept { | |||
| 529 | if constexpr (!std::is_void_v<select_t<I, T...>>) { | |||
| 530 | return &data_.template get<I>(); | |||
| 531 | } | |||
| 532 | } | |||
| 533 | ||||
| 534 | template <size_t I> | |||
| 535 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::const_pointer ptr() | |||
| 536 | const noexcept { | |||
| 537 | if constexpr (!std::is_void_v<select_t<I, T...>>) { | |||
| 538 | return &data_.template get<I>(); | |||
| 539 | } | |||
| 540 | } | |||
| 541 | ||||
| 542 | template <size_t I, typename... Args> | |||
| 543 | constexpr void emplace([[maybe_unused]] Args&&... args) { | |||
| 544 | discrim_ = static_cast<discrim_t>(I); | |||
| 545 | if constexpr (sizeof...(Args) > 0 && !std::is_void_v<select_t<I, T...>>) { | |||
| 546 | std::construct_at(ptr<I>(), std::forward<Args>(args)...); | |||
| 547 | } | |||
| 548 | } | |||
| 549 | ||||
| 550 | template <size_t I, typename... Args> | |||
| 551 | ✗ | constexpr void uninit_emplace([[maybe_unused]] Args&&... args) { | ||
| 552 | ✗ | discrim_ = static_cast<discrim_t>(I); | ||
| 553 | if constexpr (sizeof...(Args) > 0 && !std::is_void_v<select_t<I, T...>>) { | |||
| 554 | std::construct_at(ptr<I>(), std::forward<Args>(args)...); | |||
| 555 | } | |||
| 556 | ✗ | } | ||
| 557 | ||||
| 558 | constexpr void swap(variant_impl& other) noexcept { | |||
| 559 | std::swap(discrim_, other.discrim_); | |||
| 560 | } | |||
| 561 | }; | |||
| 562 | ||||
| 563 | template <typename T> | |||
| 564 | class variant_impl<std::enable_if_t<!void_or_empty_or_never<T>>, T> { | |||
| 565 | private: | |||
| 566 | SUMTY_NO_UNIQ_ADDR auto_union<T> data_; | |||
| 567 | ||||
| 568 | public: | |||
| 569 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 570 | constexpr variant_impl([[maybe_unused]] uninit_t tag) noexcept {} | |||
| 571 | ||||
| 572 | 3 | constexpr variant_impl() noexcept(traits<T>::is_nothrow_default_constructible) { | ||
| 573 | 3 | data_.template construct<0>(); | ||
| 574 | 3 | } | ||
| 575 | ||||
| 576 | 2 | constexpr variant_impl(const variant_impl& other) { | ||
| 577 | 2 | data_.template construct<0>(other.data_.template get<0>()); | ||
| 578 | 2 | } | ||
| 579 | ||||
| 580 | 2 | constexpr variant_impl(variant_impl&& other) noexcept( | ||
| 581 | 2 | traits<T>::is_nothrow_move_constructible) { | ||
| 582 | 2 | data_.template construct<0>(other.data_.template get<0>()); | ||
| 583 | 2 | } | ||
| 584 | ||||
| 585 | template <typename... Args> | |||
| 586 | constexpr explicit(sizeof...(Args) == 0) | |||
| 587 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 588 | 51 | variant_impl([[maybe_unused]] std::in_place_index_t<0> inplace, Args&&... args) { | ||
| 589 | 51 | data_.template construct<0>(std::forward<Args>(args)...); | ||
| 590 | 51 | } | ||
| 591 | ||||
| 592 | 66 | constexpr ~variant_impl() noexcept(traits<T>::is_nothrow_destructible) { | ||
| 593 | 66 | data_.template destroy<0>(); | ||
| 594 | 66 | } | ||
| 595 | ||||
| 596 | 2 | constexpr variant_impl& operator=(const variant_impl& rhs) { | ||
| 597 |
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2 | if (this != &rhs) { |
| 598 | if constexpr (std::is_lvalue_reference_v<T>) { | |||
| 599 | data_.template construct<0>(rhs.data_.template get<0>()); | |||
| 600 | } else { | |||
| 601 | 2 | data_.template get<0>() = rhs.data_.template get<0>(); | ||
| 602 | } | |||
| 603 | } | |||
| 604 | 2 | return *this; | ||
| 605 | } | |||
| 606 | ||||
| 607 | 2 | constexpr variant_impl& operator=(variant_impl&& rhs) noexcept( | ||
| 608 | traits<T>::is_nothrow_move_assignable) { | |||
| 609 | if constexpr (std::is_lvalue_reference_v<T>) { | |||
| 610 | data_.template construct<0>(rhs.data_.template get<0>()); | |||
| 611 | } else { | |||
| 612 | 2 | data_.template get<0>() = std::move(rhs.data_.template get<0>()); | ||
| 613 | } | |||
| 614 | 2 | return *this; | ||
| 615 | } | |||
| 616 | ||||
| 617 | 76 | [[nodiscard]] static constexpr size_t index() noexcept { return 0; } | ||
| 618 | ||||
| 619 | template <size_t I> | |||
| 620 | 8 | [[nodiscard]] constexpr typename traits<T>::reference get() & noexcept { | ||
| 621 | 8 | return data_.template get<I>(); | ||
| 622 | } | |||
| 623 | ||||
| 624 | template <size_t I> | |||
| 625 | 1 | [[nodiscard]] constexpr typename traits<T>::const_reference get() const& noexcept { | ||
| 626 | 1 | return data_.template get<I>(); | ||
| 627 | } | |||
| 628 | ||||
| 629 | template <size_t I> | |||
| 630 | 39 | [[nodiscard]] constexpr typename traits<T>::rvalue_reference get() && { | ||
| 631 | if constexpr (std::is_void_v<T>) { | |||
| 632 | return; | |||
| 633 | } else if constexpr (std::is_lvalue_reference_v<T>) { | |||
| 634 | 8 | return data_.template get<I>(); | ||
| 635 | } else { | |||
| 636 | 31 | return std::move(data_.template get<I>()); | ||
| 637 | } | |||
| 638 | } | |||
| 639 | ||||
| 640 | template <size_t I> | |||
| 641 | [[nodiscard]] constexpr typename traits<T>::const_rvalue_reference get() const&& { | |||
| 642 | if constexpr (std::is_void_v<T>) { | |||
| 643 | return; | |||
| 644 | } else if constexpr (std::is_lvalue_reference_v<T>) { | |||
| 645 | return data_.template get<I>(); | |||
| 646 | } else { | |||
| 647 | return std::move(data_.template get<I>()); | |||
| 648 | } | |||
| 649 | } | |||
| 650 | ||||
| 651 | template <size_t I> | |||
| 652 | [[nodiscard]] constexpr typename traits<T>::pointer ptr() noexcept { | |||
| 653 | if constexpr (!std::is_void_v<T>) { | |||
| 654 | return &data_.template get<I>(); | |||
| 655 | } else { | |||
| 656 | return; | |||
| 657 | } | |||
| 658 | } | |||
| 659 | ||||
| 660 | template <size_t I> | |||
| 661 | [[nodiscard]] constexpr typename traits<T>::const_pointer ptr() const noexcept { | |||
| 662 | if constexpr (!std::is_void_v<T>) { | |||
| 663 | return &data_.template get<I>(); | |||
| 664 | } else { | |||
| 665 | return; | |||
| 666 | } | |||
| 667 | } | |||
| 668 | ||||
| 669 | template <size_t I, typename... Args> | |||
| 670 | constexpr void emplace(Args&&... args) { | |||
| 671 | data_.template destroy<0>(); | |||
| 672 | data_.template construct<0>(std::forward<Args>(args)...); | |||
| 673 | } | |||
| 674 | ||||
| 675 | template <size_t I, typename... Args> | |||
| 676 | constexpr void uninit_emplace(Args&&... args) { | |||
| 677 | data_.template construct<0>(std::forward<Args>(args)...); | |||
| 678 | } | |||
| 679 | ||||
| 680 | constexpr void swap(variant_impl& other) noexcept(traits<T>::is_nothrow_swappable) { | |||
| 681 | if constexpr (std::is_void_v<T>) { | |||
| 682 | return; | |||
| 683 | } else if constexpr (std::is_lvalue_reference_v<T>) { | |||
| 684 | auto& tmp = other.data_.template get<0>(); | |||
| 685 | other.data_.template construct<0>(data_.template get<0>()); | |||
| 686 | data_.template construct<0>(tmp); | |||
| 687 | } else { | |||
| 688 | using std::swap; | |||
| 689 | swap(data_.template get<0>(), other.data_.template get<0>()); | |||
| 690 | } | |||
| 691 | } | |||
| 692 | }; | |||
| 693 | ||||
| 694 | template <typename T> | |||
| 695 | class variant_impl<std::enable_if_t<is_sumty_empty_v<T>>, T> { | |||
| 696 | private: | |||
| 697 | SUMTY_NO_UNIQ_ADDR std::remove_const_t<T> data_; | |||
| 698 | ||||
| 699 | public: | |||
| 700 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 701 | constexpr variant_impl([[maybe_unused]] uninit_t tag) noexcept {} | |||
| 702 | ||||
| 703 | constexpr variant_impl() noexcept(traits<T>::is_nothrow_default_constructible) | |||
| 704 | : data_{} {} | |||
| 705 | ||||
| 706 | constexpr variant_impl(const variant_impl& other) = default; | |||
| 707 | ||||
| 708 | constexpr variant_impl(variant_impl&& other) noexcept( | |||
| 709 | traits<T>::is_nothrow_move_constructible) = default; | |||
| 710 | ||||
| 711 | template <typename... Args> | |||
| 712 | constexpr explicit(sizeof...(Args) == 0) | |||
| 713 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 714 | variant_impl([[maybe_unused]] std::in_place_index_t<0> inplace, Args&&... args) | |||
| 715 | : data_(std::forward<Args>(args)...) {} | |||
| 716 | ||||
| 717 | constexpr ~variant_impl() noexcept(traits<T>::is_nothrow_destructible) = default; | |||
| 718 | ||||
| 719 | constexpr variant_impl& operator=(const variant_impl& rhs) = default; | |||
| 720 | ||||
| 721 | constexpr variant_impl& operator=(variant_impl&& rhs) noexcept( | |||
| 722 | traits<T>::is_nothrow_move_assignable) = default; | |||
| 723 | ||||
| 724 | [[nodiscard]] static constexpr size_t index() noexcept { return 0; } | |||
| 725 | ||||
| 726 | template <size_t I> | |||
| 727 | [[nodiscard]] constexpr typename traits<T>::reference get() & noexcept { | |||
| 728 | return data_; | |||
| 729 | } | |||
| 730 | ||||
| 731 | template <size_t I> | |||
| 732 | [[nodiscard]] constexpr typename traits<T>::const_reference get() const& noexcept { | |||
| 733 | return data_; | |||
| 734 | } | |||
| 735 | ||||
| 736 | template <size_t I> | |||
| 737 | [[nodiscard]] constexpr typename traits<T>::rvalue_reference get() && { | |||
| 738 | return std::move(data_); | |||
| 739 | } | |||
| 740 | ||||
| 741 | template <size_t I> | |||
| 742 | [[nodiscard]] constexpr typename traits<T>::const_rvalue_reference get() const&& { | |||
| 743 | return std::move(data_); | |||
| 744 | } | |||
| 745 | ||||
| 746 | template <size_t I> | |||
| 747 | [[nodiscard]] constexpr typename traits<T>::pointer ptr() noexcept { | |||
| 748 | return &data_; | |||
| 749 | } | |||
| 750 | ||||
| 751 | template <size_t I> | |||
| 752 | [[nodiscard]] constexpr typename traits<T>::const_pointer ptr() const noexcept { | |||
| 753 | return &data_; | |||
| 754 | } | |||
| 755 | ||||
| 756 | template <size_t I, typename... Args> | |||
| 757 | constexpr void emplace(Args&&... args) { | |||
| 758 | // data_ is trivial, so no need to explicitly destroy it | |||
| 759 | ::new (&data_) T(std::forward<Args>(args)...); | |||
| 760 | } | |||
| 761 | ||||
| 762 | template <size_t I, typename... Args> | |||
| 763 | constexpr void uninit_emplace(Args&&... args) { | |||
| 764 | ::new (&data_) T(std::forward<Args>(args)...); | |||
| 765 | } | |||
| 766 | ||||
| 767 | constexpr void swap(variant_impl& other) noexcept(traits<T>::is_nothrow_swappable) { | |||
| 768 | using std::swap; | |||
| 769 | swap(data_, other.data_); | |||
| 770 | } | |||
| 771 | }; | |||
| 772 | ||||
| 773 | template <> | |||
| 774 | class variant_impl<void, void> { | |||
| 775 | public: | |||
| 776 | constexpr variant_impl() noexcept = default; | |||
| 777 | ||||
| 778 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 779 | constexpr variant_impl([[maybe_unused]] uninit_t tag) noexcept : variant_impl() {} | |||
| 780 | ||||
| 781 | 6 | explicit constexpr variant_impl( | ||
| 782 | 6 | [[maybe_unused]] std::in_place_index_t<0> inplace) noexcept {} | ||
| 783 | ||||
| 784 | template <typename T> | |||
| 785 | constexpr variant_impl([[maybe_unused]] std::in_place_index_t<0> inplace, | |||
| 786 | // NOLINTNEXTLINE(cppcoreguidelines-missing-std-forward) | |||
| 787 | [[maybe_unused]] T&& value) noexcept {} | |||
| 788 | ||||
| 789 | 6 | [[nodiscard]] static constexpr size_t index() noexcept { return 0; } | ||
| 790 | ||||
| 791 | template <size_t I> | |||
| 792 | static constexpr void get() noexcept {} | |||
| 793 | ||||
| 794 | template <size_t I> | |||
| 795 | static constexpr void ptr() noexcept {} | |||
| 796 | ||||
| 797 | static constexpr void swap([[maybe_unused]] variant_impl& other) noexcept {} | |||
| 798 | }; | |||
| 799 | ||||
| 800 | template <typename T> | |||
| 801 | class variant_impl<void, T&, void> { | |||
| 802 | private: | |||
| 803 | T* data_; | |||
| 804 | ||||
| 805 | public: | |||
| 806 | variant_impl() = delete; | |||
| 807 | ||||
| 808 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 809 | constexpr variant_impl([[maybe_unused]] uninit_t tag) noexcept : data_(nullptr) {} | |||
| 810 | ||||
| 811 | template <typename U> | |||
| 812 | requires(std::is_convertible_v<U*, T*>) | |||
| 813 | constexpr variant_impl([[maybe_unused]] std::in_place_index_t<0> inplace, | |||
| 814 | U& value) noexcept | |||
| 815 | : data_(&value) {} | |||
| 816 | ||||
| 817 | explicit constexpr variant_impl( | |||
| 818 | [[maybe_unused]] std::in_place_index_t<1> inplace) noexcept | |||
| 819 | : data_(nullptr) {} | |||
| 820 | ||||
| 821 | template <typename U> | |||
| 822 | explicit constexpr variant_impl([[maybe_unused]] std::in_place_index_t<1> inplace, | |||
| 823 | // NOLINTNEXTLINE(cppcoreguidelines-missing-std-forward) | |||
| 824 | [[maybe_unused]] U&& value) noexcept | |||
| 825 | : data_(nullptr) {} | |||
| 826 | ||||
| 827 | [[nodiscard]] constexpr size_t index() const noexcept { | |||
| 828 | return static_cast<size_t>(data_ == nullptr); | |||
| 829 | } | |||
| 830 | ||||
| 831 | template <size_t I> | |||
| 832 | [[nodiscard]] constexpr typename traits<select_t<I, T&, void>>::const_reference get() | |||
| 833 | const noexcept { | |||
| 834 | if constexpr (I == 0) { | |||
| 835 | return *data_; | |||
| 836 | } else { | |||
| 837 | return; | |||
| 838 | } | |||
| 839 | } | |||
| 840 | ||||
| 841 | template <size_t I> | |||
| 842 | [[nodiscard]] constexpr typename traits<select_t<I, T&, void>>::const_pointer ptr() | |||
| 843 | const noexcept { | |||
| 844 | if constexpr (I == 0) { | |||
| 845 | return data_; | |||
| 846 | } else { | |||
| 847 | return; | |||
| 848 | } | |||
| 849 | } | |||
| 850 | ||||
| 851 | template <size_t I> | |||
| 852 | constexpr void emplace() noexcept { | |||
| 853 | static_assert(I == 1, "no matching constructor for reference"); | |||
| 854 | data_ = nullptr; | |||
| 855 | } | |||
| 856 | ||||
| 857 | template <size_t I, typename U> | |||
| 858 | // NOLINTNEXTLINE(cppcoreguidelines-missing-std-forward) | |||
| 859 | constexpr void emplace([[maybe_unused]] U&& value) noexcept { | |||
| 860 | if constexpr (I == 0) { | |||
| 861 | static_assert(std::is_lvalue_reference_v<U>, | |||
| 862 | "no matching constructor for reference"); | |||
| 863 | data_ = &value; | |||
| 864 | } else { | |||
| 865 | data_ = nullptr; | |||
| 866 | } | |||
| 867 | } | |||
| 868 | ||||
| 869 | template <size_t I> | |||
| 870 | constexpr void uninit_emplace() noexcept { | |||
| 871 | emplace<I>(); | |||
| 872 | } | |||
| 873 | ||||
| 874 | template <size_t I, typename U> | |||
| 875 | constexpr void uninit_emplace(U&& value) noexcept { | |||
| 876 | emplace<I>(std::forward<U>(value)); | |||
| 877 | } | |||
| 878 | ||||
| 879 | constexpr void swap(variant_impl& other) noexcept { std::swap(data_, other.data_); } | |||
| 880 | }; | |||
| 881 | ||||
| 882 | template <typename T> | |||
| 883 | class variant_impl<void, void, T&> { | |||
| 884 | private: | |||
| 885 | T* data_{nullptr}; | |||
| 886 | ||||
| 887 | public: | |||
| 888 | 10 | constexpr variant_impl() noexcept = default; | ||
| 889 | ||||
| 890 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 891 | 2 | constexpr variant_impl([[maybe_unused]] uninit_t tag) noexcept : variant_impl() {} | ||
| 892 | ||||
| 893 | explicit constexpr variant_impl( | |||
| 894 | [[maybe_unused]] std::in_place_index_t<0> inplace) noexcept | |||
| 895 | : data_(nullptr) {} | |||
| 896 | ||||
| 897 | template <typename U> | |||
| 898 | explicit constexpr variant_impl([[maybe_unused]] std::in_place_index_t<0> inplace, | |||
| 899 | // NOLINTNEXTLINE(cppcoreguidelines-missing-std-forward) | |||
| 900 | [[maybe_unused]] U&& value) noexcept | |||
| 901 | : data_(nullptr) {} | |||
| 902 | ||||
| 903 | template <typename U> | |||
| 904 | requires(std::is_convertible_v<U*, T*>) | |||
| 905 | 2 | constexpr variant_impl([[maybe_unused]] std::in_place_index_t<1> inplace, | ||
| 906 | U& value) noexcept | |||
| 907 | 2 | : data_(&value) {} | ||
| 908 | ||||
| 909 | 100 | [[nodiscard]] constexpr size_t index() const noexcept { | ||
| 910 | 100 | return static_cast<size_t>(data_ != nullptr); | ||
| 911 | } | |||
| 912 | ||||
| 913 | template <size_t I> | |||
| 914 | 62 | [[nodiscard]] constexpr typename traits<select_t<I, void, T&>>::const_reference get() | ||
| 915 | const noexcept { | |||
| 916 | if constexpr (I == 1) { | |||
| 917 | 60 | return *data_; | ||
| 918 | } else { | |||
| 919 | 2 | return; | ||
| 920 | } | |||
| 921 | } | |||
| 922 | ||||
| 923 | template <size_t I> | |||
| 924 | [[nodiscard]] constexpr typename traits<select_t<I, void, T&>>::const_pointer ptr() | |||
| 925 | const noexcept { | |||
| 926 | if constexpr (I == 1) { | |||
| 927 | return data_; | |||
| 928 | } else { | |||
| 929 | return; | |||
| 930 | } | |||
| 931 | } | |||
| 932 | ||||
| 933 | template <size_t I> | |||
| 934 | 1 | constexpr void emplace() noexcept { | ||
| 935 | static_assert(I == 0, "no matching constructor for reference"); | |||
| 936 | 1 | data_ = nullptr; | ||
| 937 | 1 | } | ||
| 938 | ||||
| 939 | template <size_t I, typename U> | |||
| 940 | // NOLINTNEXTLINE(cppcoreguidelines-missing-std-forward) | |||
| 941 | 8 | constexpr void emplace([[maybe_unused]] U&& value) noexcept { | ||
| 942 | if constexpr (I == 1) { | |||
| 943 | static_assert(std::is_lvalue_reference_v<U>, | |||
| 944 | "no matching constructor for reference"); | |||
| 945 | 8 | data_ = &value; | ||
| 946 | } else { | |||
| 947 | ✗ | data_ = nullptr; | ||
| 948 | } | |||
| 949 | 8 | } | ||
| 950 | ||||
| 951 | template <size_t I> | |||
| 952 | constexpr void uninit_emplace() noexcept { | |||
| 953 | emplace<I>(); | |||
| 954 | } | |||
| 955 | ||||
| 956 | template <size_t I, typename U> | |||
| 957 | 4 | constexpr void uninit_emplace(U&& value) noexcept { | ||
| 958 | 4 | emplace<I>(std::forward<U>(value)); | ||
| 959 | 4 | } | ||
| 960 | ||||
| 961 | constexpr void swap(variant_impl& other) noexcept { std::swap(data_, other.data_); } | |||
| 962 | }; | |||
| 963 | ||||
| 964 | template <typename T, typename U> | |||
| 965 | class variant_impl<std::enable_if_t<is_sumty_empty_v<U>>, T&, U> { | |||
| 966 | private: | |||
| 967 | T* head_; | |||
| 968 | SUMTY_NO_UNIQ_ADDR U tail_{}; | |||
| 969 | ||||
| 970 | public: | |||
| 971 | variant_impl() = delete; | |||
| 972 | ||||
| 973 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 974 | constexpr variant_impl([[maybe_unused]] uninit_t tag) noexcept : head_(nullptr) {} | |||
| 975 | ||||
| 976 | constexpr variant_impl(const variant_impl& other) noexcept = default; | |||
| 977 | ||||
| 978 | constexpr variant_impl(variant_impl&& other) noexcept = default; | |||
| 979 | ||||
| 980 | template <typename V> | |||
| 981 | requires(std::is_convertible_v<V*, T*>) | |||
| 982 | constexpr variant_impl([[maybe_unused]] std::in_place_index_t<0> inplace, | |||
| 983 | V& value) noexcept | |||
| 984 | : head_(&value) {} | |||
| 985 | ||||
| 986 | template <typename... Args> | |||
| 987 | explicit(sizeof...(Args) == 0) | |||
| 988 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 989 | constexpr variant_impl([[maybe_unused]] std::in_place_index_t<1> inplace, | |||
| 990 | Args&&... args) | |||
| 991 | : head_(nullptr), tail_(std::forward<Args>(args)...) {} | |||
| 992 | ||||
| 993 | constexpr ~variant_impl() noexcept = default; | |||
| 994 | ||||
| 995 | constexpr variant_impl& operator=(const variant_impl& rhs) = default; | |||
| 996 | ||||
| 997 | constexpr variant_impl& operator=(variant_impl&& rhs) noexcept = default; | |||
| 998 | ||||
| 999 | [[nodiscard]] constexpr size_t index() const noexcept { | |||
| 1000 | return static_cast<size_t>(head_ == nullptr); | |||
| 1001 | } | |||
| 1002 | ||||
| 1003 | template <size_t I> | |||
| 1004 | [[nodiscard]] constexpr typename traits<select_t<I, T&, U>>::reference | |||
| 1005 | get() & noexcept { | |||
| 1006 | if constexpr (I == 0) { | |||
| 1007 | return *head_; | |||
| 1008 | } else { | |||
| 1009 | return tail_; | |||
| 1010 | } | |||
| 1011 | } | |||
| 1012 | ||||
| 1013 | template <size_t I> | |||
| 1014 | [[nodiscard]] constexpr typename traits<select_t<I, T&, U>>::const_reference get() | |||
| 1015 | const& noexcept { | |||
| 1016 | if constexpr (I == 0) { | |||
| 1017 | return *head_; | |||
| 1018 | } else { | |||
| 1019 | return tail_; | |||
| 1020 | } | |||
| 1021 | } | |||
| 1022 | ||||
| 1023 | template <size_t I> | |||
| 1024 | [[nodiscard]] constexpr typename traits<select_t<I, T&, U>>::rvalue_reference get() && { | |||
| 1025 | if constexpr (I == 0) { | |||
| 1026 | return *head_; | |||
| 1027 | } else { | |||
| 1028 | return std::move(tail_); | |||
| 1029 | } | |||
| 1030 | } | |||
| 1031 | ||||
| 1032 | template <size_t I> | |||
| 1033 | [[nodiscard]] constexpr typename traits<select_t<I, T&, U>>::const_rvalue_reference | |||
| 1034 | get() const&& { | |||
| 1035 | if constexpr (I == 0) { | |||
| 1036 | return *head_; | |||
| 1037 | } else { | |||
| 1038 | return std::move(tail_); | |||
| 1039 | } | |||
| 1040 | } | |||
| 1041 | ||||
| 1042 | template <size_t I> | |||
| 1043 | [[nodiscard]] constexpr typename traits<select_t<I, T&, U>>::pointer ptr() noexcept { | |||
| 1044 | if constexpr (I == 0) { | |||
| 1045 | return head_; | |||
| 1046 | } else { | |||
| 1047 | return &tail_; | |||
| 1048 | } | |||
| 1049 | } | |||
| 1050 | ||||
| 1051 | template <size_t I> | |||
| 1052 | [[nodiscard]] constexpr typename traits<select_t<I, T&, U>>::const_pointer ptr() | |||
| 1053 | const noexcept { | |||
| 1054 | if constexpr (I == 0) { | |||
| 1055 | return head_; | |||
| 1056 | } else { | |||
| 1057 | return &tail_; | |||
| 1058 | } | |||
| 1059 | } | |||
| 1060 | ||||
| 1061 | template <size_t I, typename... Args> | |||
| 1062 | constexpr void emplace(Args&&... args) noexcept { | |||
| 1063 | if constexpr (I == 0) { | |||
| 1064 | static_assert( | |||
| 1065 | (true && ... && std::is_lvalue_reference_v<Args>)&&sizeof...(Args) == 1, | |||
| 1066 | "no matching constructor for reference"); | |||
| 1067 | head_ = std::addressof(std::forward<Args>(args)...); | |||
| 1068 | } else { | |||
| 1069 | head_ = nullptr; | |||
| 1070 | std::construct_at(&tail_, std::forward<Args>(args)...); | |||
| 1071 | } | |||
| 1072 | } | |||
| 1073 | ||||
| 1074 | template <size_t I, typename... Args> | |||
| 1075 | constexpr void uninit_emplace(Args&&... args) noexcept { | |||
| 1076 | if constexpr (I == 0) { | |||
| 1077 | static_assert( | |||
| 1078 | (true && ... && std::is_lvalue_reference_v<Args>)&&sizeof...(Args) == 1, | |||
| 1079 | "no matching constructor for reference"); | |||
| 1080 | head_ = std::addressof(std::forward<Args>(args)...); | |||
| 1081 | } else { | |||
| 1082 | head_ = nullptr; | |||
| 1083 | std::construct_at(&tail_, std::forward<Args>(args)...); | |||
| 1084 | } | |||
| 1085 | } | |||
| 1086 | ||||
| 1087 | constexpr void swap(variant_impl& other) noexcept( | |||
| 1088 | std::is_nothrow_swappable_v<U> && std::is_nothrow_move_constructible_v<U> && | |||
| 1089 | std::is_nothrow_destructible_v<U>) { | |||
| 1090 | if (head_ == nullptr) { | |||
| 1091 | if (other.head_ != nullptr) { | |||
| 1092 | head_ = other.head_; | |||
| 1093 | other.head_ = nullptr; | |||
| 1094 | } | |||
| 1095 | } else { | |||
| 1096 | if (other.head_ == nullptr) { | |||
| 1097 | other.head_ = head_; | |||
| 1098 | head_ = nullptr; | |||
| 1099 | } | |||
| 1100 | } | |||
| 1101 | } | |||
| 1102 | }; | |||
| 1103 | ||||
| 1104 | template <typename T, typename U> | |||
| 1105 | class variant_impl<std::enable_if_t<is_sumty_empty_v<T>>, T, U&> { | |||
| 1106 | private: | |||
| 1107 | U* tail_{nullptr}; | |||
| 1108 | SUMTY_NO_UNIQ_ADDR T head_{}; | |||
| 1109 | ||||
| 1110 | public: | |||
| 1111 | constexpr variant_impl() noexcept = default; | |||
| 1112 | ||||
| 1113 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 1114 | constexpr variant_impl([[maybe_unused]] uninit_t tag) noexcept : tail_(nullptr) {} | |||
| 1115 | ||||
| 1116 | constexpr variant_impl(const variant_impl& other) noexcept = default; | |||
| 1117 | ||||
| 1118 | constexpr variant_impl(variant_impl&& other) noexcept = default; | |||
| 1119 | ||||
| 1120 | template <typename... Args> | |||
| 1121 | explicit(sizeof...(Args) == 0) | |||
| 1122 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 1123 | constexpr variant_impl([[maybe_unused]] std::in_place_index_t<0> inplace, | |||
| 1124 | Args&&... args) { | |||
| 1125 | std::construct_at(&head_, std::forward<Args>(args)...); | |||
| 1126 | } | |||
| 1127 | ||||
| 1128 | template <typename V> | |||
| 1129 | requires(std::is_convertible_v<V*, U*>) | |||
| 1130 | constexpr variant_impl([[maybe_unused]] std::in_place_index_t<1> inplace, | |||
| 1131 | V& value) noexcept | |||
| 1132 | : tail_(&value) {} | |||
| 1133 | ||||
| 1134 | constexpr ~variant_impl() noexcept = default; | |||
| 1135 | ||||
| 1136 | constexpr variant_impl& operator=(const variant_impl& rhs) = default; | |||
| 1137 | ||||
| 1138 | constexpr variant_impl& operator=(variant_impl&& rhs) noexcept = default; | |||
| 1139 | ||||
| 1140 | [[nodiscard]] constexpr size_t index() const noexcept { | |||
| 1141 | return static_cast<size_t>(tail_ != nullptr); | |||
| 1142 | } | |||
| 1143 | ||||
| 1144 | template <size_t I> | |||
| 1145 | [[nodiscard]] constexpr typename traits<select_t<I, T, U&>>::reference | |||
| 1146 | get() & noexcept { | |||
| 1147 | if constexpr (I == 0) { | |||
| 1148 | return head_; | |||
| 1149 | } else { | |||
| 1150 | return *tail_; | |||
| 1151 | } | |||
| 1152 | } | |||
| 1153 | ||||
| 1154 | template <size_t I> | |||
| 1155 | [[nodiscard]] constexpr typename traits<select_t<I, T, U&>>::const_reference get() | |||
| 1156 | const& noexcept { | |||
| 1157 | if constexpr (I == 0) { | |||
| 1158 | return head_; | |||
| 1159 | } else { | |||
| 1160 | return *tail_; | |||
| 1161 | } | |||
| 1162 | } | |||
| 1163 | ||||
| 1164 | template <size_t I> | |||
| 1165 | [[nodiscard]] constexpr typename traits<select_t<I, T, U&>>::rvalue_reference get() && { | |||
| 1166 | if constexpr (I == 0) { | |||
| 1167 | return std::move(head_); | |||
| 1168 | } else { | |||
| 1169 | return *tail_; | |||
| 1170 | } | |||
| 1171 | } | |||
| 1172 | ||||
| 1173 | template <size_t I> | |||
| 1174 | [[nodiscard]] constexpr typename traits<select_t<I, T, U&>>::const_rvalue_reference | |||
| 1175 | get() const&& { | |||
| 1176 | if constexpr (I == 0) { | |||
| 1177 | return std::move(head_); | |||
| 1178 | } else { | |||
| 1179 | return *tail_; | |||
| 1180 | } | |||
| 1181 | } | |||
| 1182 | ||||
| 1183 | template <size_t I> | |||
| 1184 | [[nodiscard]] constexpr typename traits<select_t<I, T, U&>>::pointer ptr() noexcept { | |||
| 1185 | if constexpr (I == 0) { | |||
| 1186 | return &head_; | |||
| 1187 | } else { | |||
| 1188 | return tail_; | |||
| 1189 | } | |||
| 1190 | } | |||
| 1191 | ||||
| 1192 | template <size_t I> | |||
| 1193 | [[nodiscard]] constexpr typename traits<select_t<I, T, U&>>::const_pointer ptr() | |||
| 1194 | const noexcept { | |||
| 1195 | if constexpr (I == 0) { | |||
| 1196 | return &head_; | |||
| 1197 | } else { | |||
| 1198 | return tail_; | |||
| 1199 | } | |||
| 1200 | } | |||
| 1201 | ||||
| 1202 | template <size_t I, typename... Args> | |||
| 1203 | constexpr void emplace(Args&&... args) noexcept { | |||
| 1204 | if constexpr (I == 1) { | |||
| 1205 | static_assert( | |||
| 1206 | (true && ... && std::is_lvalue_reference_v<Args>)&&sizeof...(Args) == 1, | |||
| 1207 | "no matching constructor for reference"); | |||
| 1208 | tail_ = std::addressof(std::forward<Args>(args)...); | |||
| 1209 | } else { | |||
| 1210 | tail_ = nullptr; | |||
| 1211 | std::construct_at(&head_, std::forward<Args>(args)...); | |||
| 1212 | } | |||
| 1213 | } | |||
| 1214 | ||||
| 1215 | template <size_t I, typename... Args> | |||
| 1216 | constexpr void uninit_emplace(Args&&... args) noexcept { | |||
| 1217 | if constexpr (I == 1) { | |||
| 1218 | static_assert( | |||
| 1219 | (true && ... && std::is_lvalue_reference_v<Args>)&&sizeof...(Args) == 1, | |||
| 1220 | "no matching constructor for reference"); | |||
| 1221 | tail_ = std::addressof(std::forward<Args>(args)...); | |||
| 1222 | } else { | |||
| 1223 | tail_ = nullptr; | |||
| 1224 | std::construct_at(&head_.head, std::forward<Args>(args)...); | |||
| 1225 | } | |||
| 1226 | } | |||
| 1227 | ||||
| 1228 | constexpr void swap(variant_impl& other) noexcept( | |||
| 1229 | std::is_nothrow_swappable_v<T> && std::is_nothrow_move_constructible_v<T> && | |||
| 1230 | std::is_nothrow_destructible_v<T>) { | |||
| 1231 | if (tail_ == nullptr) { | |||
| 1232 | if (other.tail_ != nullptr) { | |||
| 1233 | tail_ = other.tail_; | |||
| 1234 | other.tail_ = nullptr; | |||
| 1235 | } | |||
| 1236 | } else { | |||
| 1237 | if (other.tail_ == nullptr) { | |||
| 1238 | other.tail_ = tail_; | |||
| 1239 | tail_ = nullptr; | |||
| 1240 | } | |||
| 1241 | } | |||
| 1242 | } | |||
| 1243 | }; | |||
| 1244 | ||||
| 1245 | template <typename V, typename T> | |||
| 1246 | struct variant_impl_prepend; | |||
| 1247 | ||||
| 1248 | template <typename T, typename... TN> | |||
| 1249 | struct variant_impl_prepend<variant_impl<void, TN...>, T> { | |||
| 1250 | using type = variant_impl<void, T, TN...>; | |||
| 1251 | }; | |||
| 1252 | ||||
| 1253 | template <typename... T> | |||
| 1254 | struct variant_impl_except_last; | |||
| 1255 | ||||
| 1256 | template <typename T> | |||
| 1257 | struct variant_impl_except_last<T> { | |||
| 1258 | using type = variant_impl<void>; | |||
| 1259 | }; | |||
| 1260 | ||||
| 1261 | template <typename T0, typename T1, typename... TN> | |||
| 1262 | struct variant_impl_except_last<T0, T1, TN...> { | |||
| 1263 | using type = | |||
| 1264 | typename variant_impl_prepend<typename variant_impl_except_last<T1, TN...>::type, | |||
| 1265 | T0>::type; | |||
| 1266 | }; | |||
| 1267 | ||||
| 1268 | template <typename... T> | |||
| 1269 | using variant_impl_except_last_t = typename variant_impl_except_last<T...>::type; | |||
| 1270 | ||||
| 1271 | template <typename... T> | |||
| 1272 | class variant_impl< | |||
| 1273 | std::enable_if_t<std::is_base_of_v<never, std::remove_cvref_t<last_t<T...>>> && | |||
| 1274 | (sizeof...(T) > 1) && | |||
| 1275 | !std::is_base_of_v<never, std::remove_cvref_t<first_t<T...>>>>, | |||
| 1276 | T...> : variant_impl_except_last_t<T...> { | |||
| 1277 | private: | |||
| 1278 | using inner_t = variant_impl_except_last_t<T...>; | |||
| 1279 | using never_t = last_t<T...>; | |||
| 1280 | ||||
| 1281 | 18 | [[nodiscard]] constexpr inner_t& inner() noexcept { | ||
| 1282 | 18 | return *static_cast<inner_t*>(this); | ||
| 1283 | } | |||
| 1284 | ||||
| 1285 | 28 | [[nodiscard]] constexpr const inner_t& inner() const noexcept { | ||
| 1286 | 28 | return *static_cast<const inner_t*>(this); | ||
| 1287 | } | |||
| 1288 | ||||
| 1289 | public: | |||
| 1290 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 1291 | constexpr variant_impl([[maybe_unused]] uninit_t tag) noexcept {} | |||
| 1292 | ||||
| 1293 | 2 | constexpr variant_impl() noexcept(std::is_nothrow_default_constructible_v<inner_t>) = | ||
| 1294 | default; | |||
| 1295 | ||||
| 1296 | 1 | constexpr variant_impl(const variant_impl&) = default; | ||
| 1297 | ||||
| 1298 | 1 | constexpr variant_impl(variant_impl&&) noexcept( | ||
| 1299 | std::is_nothrow_move_constructible_v<inner_t>) = default; | |||
| 1300 | ||||
| 1301 | template <typename... Args> | |||
| 1302 | constexpr explicit(sizeof...(Args) == 0) | |||
| 1303 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 1304 | variant_impl([[maybe_unused]] std::in_place_index_t<sizeof...(T)> inplace, | |||
| 1305 | Args&&... args) noexcept { | |||
| 1306 | [[maybe_unused]] never_t value{std::forward<Args>(args)...}; | |||
| 1307 | } | |||
| 1308 | ||||
| 1309 | template <size_t I, typename... Args> | |||
| 1310 | requires(I < sizeof...(T) - 1) | |||
| 1311 | constexpr explicit(sizeof...(Args) == 0) | |||
| 1312 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 1313 | 16 | variant_impl(std::in_place_index_t<I> inplace, Args&&... args) noexcept( | ||
| 1314 | std::is_nothrow_constructible_v<inner_t, std::in_place_index_t<I>, Args&&...>) | |||
| 1315 | 16 | : inner_t(inplace, std::forward<Args>(args)...) {} | ||
| 1316 | ||||
| 1317 | 22 | constexpr ~variant_impl() noexcept(std::is_nothrow_destructible_v<inner_t>) = default; | ||
| 1318 | ||||
| 1319 | 1 | constexpr variant_impl& operator=(const variant_impl&) = default; | ||
| 1320 | ||||
| 1321 | 1 | constexpr variant_impl& operator=(variant_impl&&) noexcept( | ||
| 1322 | std::is_nothrow_move_assignable_v<inner_t>) = default; | |||
| 1323 | ||||
| 1324 | 28 | [[nodiscard]] constexpr size_t index() const noexcept { return inner().index(); } | ||
| 1325 | ||||
| 1326 | template <size_t I> | |||
| 1327 | // NOLINTNEXTLINE(bugprone-exception-escape) | |||
| 1328 | 4 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::reference get() & noexcept { | ||
| 1329 | if constexpr (I == sizeof...(T) - 1) { | |||
| 1330 | typename traits<never_t>::pointer ptr = nullptr; | |||
| 1331 | return *ptr; | |||
| 1332 | } else { | |||
| 1333 | 4 | return inner().template get<I>(); | ||
| 1334 | } | |||
| 1335 | } | |||
| 1336 | ||||
| 1337 | template <size_t I> | |||
| 1338 | // NOLINTNEXTLINE(bugprone-exception-escape) | |||
| 1339 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::const_reference get() | |||
| 1340 | const& noexcept { | |||
| 1341 | if constexpr (I == sizeof...(T) - 1) { | |||
| 1342 | typename traits<never_t>::const_pointer ptr = nullptr; | |||
| 1343 | return *ptr; | |||
| 1344 | } else { | |||
| 1345 | return inner().template get<I>(); | |||
| 1346 | } | |||
| 1347 | } | |||
| 1348 | ||||
| 1349 | template <size_t I> | |||
| 1350 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::rvalue_reference | |||
| 1351 | // NOLINTNEXTLINE(bugprone-exception-escape) | |||
| 1352 | 10 | get() && noexcept { | ||
| 1353 | if constexpr (I == sizeof...(T) - 1) { | |||
| 1354 | ✗ | typename traits<never_t>::pointer ptr = nullptr; | ||
| 1355 | ✗ | return std::move(*ptr); | ||
| 1356 | } else { | |||
| 1357 | 10 | return std::move(inner()).template get<I>(); | ||
| 1358 | } | |||
| 1359 | } | |||
| 1360 | ||||
| 1361 | template <size_t I> | |||
| 1362 | // NOLINTNEXTLINE(bugprone-exception-escape) | |||
| 1363 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::const_rvalue_reference get() | |||
| 1364 | const&& noexcept { | |||
| 1365 | if constexpr (I == sizeof...(T) - 1) { | |||
| 1366 | typename traits<never_t>::const_pointer ptr = nullptr; | |||
| 1367 | return std::move(*ptr); | |||
| 1368 | } else { | |||
| 1369 | return std::move(inner()).template get<I>(); | |||
| 1370 | } | |||
| 1371 | } | |||
| 1372 | ||||
| 1373 | template <size_t I> | |||
| 1374 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::pointer ptr() noexcept { | |||
| 1375 | if constexpr (I == sizeof...(T) - 1) { | |||
| 1376 | return nullptr; | |||
| 1377 | } else { | |||
| 1378 | return inner().template ptr<I>(); | |||
| 1379 | } | |||
| 1380 | } | |||
| 1381 | ||||
| 1382 | template <size_t I> | |||
| 1383 | [[nodiscard]] constexpr typename traits<select_t<I, T...>>::const_pointer ptr() | |||
| 1384 | const noexcept { | |||
| 1385 | if constexpr (I == sizeof...(T) - 1) { | |||
| 1386 | return nullptr; | |||
| 1387 | } else { | |||
| 1388 | return inner().template ptr<I>(); | |||
| 1389 | } | |||
| 1390 | } | |||
| 1391 | ||||
| 1392 | template <size_t I, typename... Args> | |||
| 1393 | constexpr void emplace(Args&&... args) { | |||
| 1394 | if constexpr (I == sizeof...(T) - 1) { | |||
| 1395 | [[maybe_unused]] never_t value{std::forward<Args>(args)...}; | |||
| 1396 | } else { | |||
| 1397 | inner().template emplace<I>(std::forward<Args>(args)...); | |||
| 1398 | } | |||
| 1399 | } | |||
| 1400 | ||||
| 1401 | template <size_t I, typename... Args> | |||
| 1402 | constexpr void uninit_emplace(Args&&... args) { | |||
| 1403 | if constexpr (I == sizeof...(T) - 1) { | |||
| 1404 | [[maybe_unused]] never_t value{std::forward<Args>(args)...}; | |||
| 1405 | } else { | |||
| 1406 | inner().template uninit_emplace<I>(std::forward<Args>(args)...); | |||
| 1407 | } | |||
| 1408 | } | |||
| 1409 | ||||
| 1410 | constexpr void swap(variant_impl& other) noexcept( | |||
| 1411 | std::is_nothrow_swappable_v<inner_t>) { | |||
| 1412 | inner().swap(other.inner()); | |||
| 1413 | } | |||
| 1414 | }; | |||
| 1415 | ||||
| 1416 | template <typename T0, typename... TN> | |||
| 1417 | class variant_impl<std::enable_if_t<std::is_base_of_v<never, std::remove_cvref_t<T0>> && | |||
| 1418 | (sizeof...(TN) > 0)>, | |||
| 1419 | T0, | |||
| 1420 | TN...> : variant_impl<void, TN...> { | |||
| 1421 | private: | |||
| 1422 | 37 | [[nodiscard]] constexpr variant_impl<void, TN...>& inner() noexcept { | ||
| 1423 | 37 | return *static_cast<variant_impl<void, TN...>*>(this); | ||
| 1424 | } | |||
| 1425 | ||||
| 1426 | 55 | [[nodiscard]] constexpr const variant_impl<void, TN...>& inner() const noexcept { | ||
| 1427 | 55 | return *static_cast<const variant_impl<void, TN...>*>(this); | ||
| 1428 | } | |||
| 1429 | ||||
| 1430 | public: | |||
| 1431 | static inline constexpr bool okie_dokie = true; | |||
| 1432 | ||||
| 1433 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 1434 | constexpr variant_impl([[maybe_unused]] uninit_t tag) noexcept {} | |||
| 1435 | ||||
| 1436 | constexpr variant_impl() noexcept( | |||
| 1437 | std::is_nothrow_default_constructible_v<variant_impl<void, TN...>>) = default; | |||
| 1438 | ||||
| 1439 | 1 | constexpr variant_impl(const variant_impl&) = default; | ||
| 1440 | ||||
| 1441 | 1 | constexpr variant_impl(variant_impl&&) noexcept( | ||
| 1442 | std::is_nothrow_move_constructible_v<variant_impl<void, TN...>>) = default; | |||
| 1443 | ||||
| 1444 | template <typename... Args> | |||
| 1445 | constexpr explicit(sizeof...(Args) == 0) | |||
| 1446 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 1447 | variant_impl([[maybe_unused]] std::in_place_index_t<0> inplace, | |||
| 1448 | Args&&... args) noexcept { | |||
| 1449 | [[maybe_unused]] T0 value{std::forward<Args>(args)...}; | |||
| 1450 | } | |||
| 1451 | ||||
| 1452 | template <size_t I, typename... Args> | |||
| 1453 | requires(I > 0) | |||
| 1454 | // NOLINTNEXTLINE(hicpp-explicit-conversions) | |||
| 1455 | 47 | constexpr explicit(sizeof...(Args) == 0) variant_impl( | ||
| 1456 | [[maybe_unused]] std::in_place_index_t<I> inplace, | |||
| 1457 | Args&&... args) noexcept(std::is_nothrow_constructible_v<variant_impl<void, TN...>, | |||
| 1458 | std::in_place_index_t<I - | |||
| 1459 | 1>, | |||
| 1460 | Args&&...>) | |||
| 1461 | : variant_impl<void, TN...>(std::in_place_index<I - 1>, | |||
| 1462 | 47 | std::forward<Args>(args)...) {} | ||
| 1463 | ||||
| 1464 | 41 | constexpr ~variant_impl() noexcept( | ||
| 1465 | std::is_nothrow_destructible_v<variant_impl<void, TN...>>) = default; | |||
| 1466 | ||||
| 1467 | 1 | constexpr variant_impl& operator=(const variant_impl&) = default; | ||
| 1468 | ||||
| 1469 | 1 | constexpr variant_impl& operator=(variant_impl&&) noexcept( | ||
| 1470 | std::is_nothrow_move_assignable_v<variant_impl<void, TN...>>) = default; | |||
| 1471 | ||||
| 1472 | 55 | [[nodiscard]] constexpr size_t index() const noexcept { return inner().index() + 1; } | ||
| 1473 | ||||
| 1474 | template <size_t I> | |||
| 1475 | [[nodiscard]] constexpr typename traits<select_t<I, T0, TN...>>::reference | |||
| 1476 | // NOLINTNEXTLINE(bugprone-exception-escape) | |||
| 1477 | 4 | get() & noexcept { | ||
| 1478 | if constexpr (I == 0) { | |||
| 1479 | typename traits<T0>::pointer ptr = nullptr; | |||
| 1480 | return *ptr; | |||
| 1481 | } else { | |||
| 1482 | 4 | return inner().template get<I - 1>(); | ||
| 1483 | } | |||
| 1484 | } | |||
| 1485 | ||||
| 1486 | template <size_t I> | |||
| 1487 | // NOLINTNEXTLINE(bugprone-exception-escape) | |||
| 1488 | [[nodiscard]] constexpr typename traits<select_t<I, T0, TN...>>::const_reference get() | |||
| 1489 | const& noexcept { | |||
| 1490 | if constexpr (I == 0) { | |||
| 1491 | typename traits<T0>::const_pointer ptr = nullptr; | |||
| 1492 | return *ptr; | |||
| 1493 | } else { | |||
| 1494 | return inner().template get<I - 1>(); | |||
| 1495 | } | |||
| 1496 | } | |||
| 1497 | ||||
| 1498 | template <size_t I> | |||
| 1499 | [[nodiscard]] constexpr typename traits<select_t<I, T0, TN...>>::rvalue_reference | |||
| 1500 | // NOLINTNEXTLINE(bugprone-exception-escape) | |||
| 1501 | 15 | get() && noexcept { | ||
| 1502 | if constexpr (I == 0) { | |||
| 1503 | ✗ | typename traits<T0>::pointer ptr = nullptr; | ||
| 1504 | ✗ | return std::move(*ptr); | ||
| 1505 | } else { | |||
| 1506 | 15 | return std::move(inner()).template get<I - 1>(); | ||
| 1507 | } | |||
| 1508 | } | |||
| 1509 | ||||
| 1510 | template <size_t I> | |||
| 1511 | [[nodiscard]] constexpr typename traits<select_t<I, T0, TN...>>::const_rvalue_reference | |||
| 1512 | // NOLINTNEXTLINE(bugprone-exception-escape) | |||
| 1513 | get() const&& noexcept { | |||
| 1514 | if constexpr (I == 0) { | |||
| 1515 | typename traits<T0>::const_pointer ptr = nullptr; | |||
| 1516 | return std::move(*ptr); | |||
| 1517 | } else { | |||
| 1518 | return std::move(inner()).template get<I - 1>(); | |||
| 1519 | } | |||
| 1520 | } | |||
| 1521 | ||||
| 1522 | template <size_t I> | |||
| 1523 | [[nodiscard]] constexpr typename traits<select_t<I, T0, TN...>>::pointer | |||
| 1524 | ptr() noexcept { | |||
| 1525 | if constexpr (I == 0) { | |||
| 1526 | return nullptr; | |||
| 1527 | } else { | |||
| 1528 | return inner().template ptr<I - 1>(); | |||
| 1529 | } | |||
| 1530 | } | |||
| 1531 | ||||
| 1532 | template <size_t I> | |||
| 1533 | [[nodiscard]] constexpr typename traits<select_t<I, T0, TN...>>::const_pointer ptr() | |||
| 1534 | const noexcept { | |||
| 1535 | if constexpr (I == 0) { | |||
| 1536 | return nullptr; | |||
| 1537 | } else { | |||
| 1538 | return inner().template ptr<I - 1>(); | |||
| 1539 | } | |||
| 1540 | } | |||
| 1541 | ||||
| 1542 | template <size_t I, typename... Args> | |||
| 1543 | constexpr void emplace(Args&&... args) { | |||
| 1544 | if constexpr (I == 0) { | |||
| 1545 | [[maybe_unused]] T0 value{std::forward<Args>(args)...}; | |||
| 1546 | } else { | |||
| 1547 | inner().template emplace<I - 1>(std::forward<Args>(args)...); | |||
| 1548 | } | |||
| 1549 | } | |||
| 1550 | ||||
| 1551 | template <size_t I, typename... Args> | |||
| 1552 | constexpr void uninit_emplace(Args&&... args) { | |||
| 1553 | if constexpr (I == 0) { | |||
| 1554 | [[maybe_unused]] T0 value{std::forward<Args>(args)...}; | |||
| 1555 | } else { | |||
| 1556 | inner().template uninit_emplace<I - 1>(std::forward<Args>(args)...); | |||
| 1557 | } | |||
| 1558 | } | |||
| 1559 | ||||
| 1560 | constexpr void swap(variant_impl& other) noexcept( | |||
| 1561 | std::is_nothrow_swappable_v<variant_impl<void, TN...>>) { | |||
| 1562 | inner().swap(other.inner()); | |||
| 1563 | } | |||
| 1564 | }; | |||
| 1565 | ||||
| 1566 | } // namespace sumty::detail | |||
| 1567 | ||||
| 1568 | #ifdef _MSC_VER | |||
| 1569 | #pragma warning(pop) | |||
| 1570 | #endif | |||
| 1571 | ||||
| 1572 | #endif | |||
| 1573 |