1.. _FeatureTestMacroTable: 2 3========================== 4Feature Test Macro Support 5========================== 6 7.. contents:: 8 :local: 9 10Overview 11======== 12 13This file documents the feature test macros currently supported by libc++. 14 15.. _feature-status: 16 17Status 18====== 19 20.. table:: Current Status 21 :name: feature-status-table 22 :widths: auto 23 24 ========================================================== ================= 25 Macro Name Value 26 ========================================================== ================= 27 **C++14** 28 ---------------------------------------------------------------------------- 29 ``__cpp_lib_chrono_udls`` ``201304L`` 30 ---------------------------------------------------------- ----------------- 31 ``__cpp_lib_complex_udls`` ``201309L`` 32 ---------------------------------------------------------- ----------------- 33 ``__cpp_lib_exchange_function`` ``201304L`` 34 ---------------------------------------------------------- ----------------- 35 ``__cpp_lib_generic_associative_lookup`` ``201304L`` 36 ---------------------------------------------------------- ----------------- 37 ``__cpp_lib_integer_sequence`` ``201304L`` 38 ---------------------------------------------------------- ----------------- 39 ``__cpp_lib_integral_constant_callable`` ``201304L`` 40 ---------------------------------------------------------- ----------------- 41 ``__cpp_lib_is_final`` ``201402L`` 42 ---------------------------------------------------------- ----------------- 43 ``__cpp_lib_is_null_pointer`` ``201309L`` 44 ---------------------------------------------------------- ----------------- 45 ``__cpp_lib_make_reverse_iterator`` ``201402L`` 46 ---------------------------------------------------------- ----------------- 47 ``__cpp_lib_make_unique`` ``201304L`` 48 ---------------------------------------------------------- ----------------- 49 ``__cpp_lib_null_iterators`` ``201304L`` 50 ---------------------------------------------------------- ----------------- 51 ``__cpp_lib_quoted_string_io`` ``201304L`` 52 ---------------------------------------------------------- ----------------- 53 ``__cpp_lib_result_of_sfinae`` ``201210L`` 54 ---------------------------------------------------------- ----------------- 55 ``__cpp_lib_robust_nonmodifying_seq_ops`` ``201304L`` 56 ---------------------------------------------------------- ----------------- 57 ``__cpp_lib_shared_timed_mutex`` ``201402L`` 58 ---------------------------------------------------------- ----------------- 59 ``__cpp_lib_string_udls`` ``201304L`` 60 ---------------------------------------------------------- ----------------- 61 ``__cpp_lib_transformation_trait_aliases`` ``201304L`` 62 ---------------------------------------------------------- ----------------- 63 ``__cpp_lib_transparent_operators`` ``201210L`` 64 ---------------------------------------------------------- ----------------- 65 ``__cpp_lib_tuple_element_t`` ``201402L`` 66 ---------------------------------------------------------- ----------------- 67 ``__cpp_lib_tuples_by_type`` ``201304L`` 68 ---------------------------------------------------------- ----------------- 69 **C++17** 70 ---------------------------------------------------------------------------- 71 ``__cpp_lib_addressof_constexpr`` ``201603L`` 72 ---------------------------------------------------------- ----------------- 73 ``__cpp_lib_allocator_traits_is_always_equal`` ``201411L`` 74 ---------------------------------------------------------- ----------------- 75 ``__cpp_lib_any`` ``201606L`` 76 ---------------------------------------------------------- ----------------- 77 ``__cpp_lib_apply`` ``201603L`` 78 ---------------------------------------------------------- ----------------- 79 ``__cpp_lib_array_constexpr`` ``201603L`` 80 ---------------------------------------------------------- ----------------- 81 ``__cpp_lib_as_const`` ``201510L`` 82 ---------------------------------------------------------- ----------------- 83 ``__cpp_lib_atomic_is_always_lock_free`` ``201603L`` 84 ---------------------------------------------------------- ----------------- 85 ``__cpp_lib_bool_constant`` ``201505L`` 86 ---------------------------------------------------------- ----------------- 87 ``__cpp_lib_boyer_moore_searcher`` ``201603L`` 88 ---------------------------------------------------------- ----------------- 89 ``__cpp_lib_byte`` ``201603L`` 90 ---------------------------------------------------------- ----------------- 91 ``__cpp_lib_chrono`` ``201611L`` 92 ---------------------------------------------------------- ----------------- 93 ``__cpp_lib_clamp`` ``201603L`` 94 ---------------------------------------------------------- ----------------- 95 ``__cpp_lib_enable_shared_from_this`` ``201603L`` 96 ---------------------------------------------------------- ----------------- 97 ``__cpp_lib_execution`` *unimplemented* 98 ---------------------------------------------------------- ----------------- 99 ``__cpp_lib_filesystem`` ``201703L`` 100 ---------------------------------------------------------- ----------------- 101 ``__cpp_lib_gcd_lcm`` ``201606L`` 102 ---------------------------------------------------------- ----------------- 103 ``__cpp_lib_hardware_interference_size`` ``201703L`` 104 ---------------------------------------------------------- ----------------- 105 ``__cpp_lib_has_unique_object_representations`` ``201606L`` 106 ---------------------------------------------------------- ----------------- 107 ``__cpp_lib_hypot`` ``201603L`` 108 ---------------------------------------------------------- ----------------- 109 ``__cpp_lib_incomplete_container_elements`` ``201505L`` 110 ---------------------------------------------------------- ----------------- 111 ``__cpp_lib_invoke`` ``201411L`` 112 ---------------------------------------------------------- ----------------- 113 ``__cpp_lib_is_aggregate`` ``201703L`` 114 ---------------------------------------------------------- ----------------- 115 ``__cpp_lib_is_invocable`` ``201703L`` 116 ---------------------------------------------------------- ----------------- 117 ``__cpp_lib_is_swappable`` ``201603L`` 118 ---------------------------------------------------------- ----------------- 119 ``__cpp_lib_launder`` ``201606L`` 120 ---------------------------------------------------------- ----------------- 121 ``__cpp_lib_logical_traits`` ``201510L`` 122 ---------------------------------------------------------- ----------------- 123 ``__cpp_lib_make_from_tuple`` ``201606L`` 124 ---------------------------------------------------------- ----------------- 125 ``__cpp_lib_map_try_emplace`` ``201411L`` 126 ---------------------------------------------------------- ----------------- 127 ``__cpp_lib_math_special_functions`` *unimplemented* 128 ---------------------------------------------------------- ----------------- 129 ``__cpp_lib_memory_resource`` ``201603L`` 130 ---------------------------------------------------------- ----------------- 131 ``__cpp_lib_node_extract`` ``201606L`` 132 ---------------------------------------------------------- ----------------- 133 ``__cpp_lib_nonmember_container_access`` ``201411L`` 134 ---------------------------------------------------------- ----------------- 135 ``__cpp_lib_not_fn`` ``201603L`` 136 ---------------------------------------------------------- ----------------- 137 ``__cpp_lib_optional`` ``201606L`` 138 ---------------------------------------------------------- ----------------- 139 ``__cpp_lib_parallel_algorithm`` *unimplemented* 140 ---------------------------------------------------------- ----------------- 141 ``__cpp_lib_raw_memory_algorithms`` ``201606L`` 142 ---------------------------------------------------------- ----------------- 143 ``__cpp_lib_sample`` ``201603L`` 144 ---------------------------------------------------------- ----------------- 145 ``__cpp_lib_scoped_lock`` ``201703L`` 146 ---------------------------------------------------------- ----------------- 147 ``__cpp_lib_shared_mutex`` ``201505L`` 148 ---------------------------------------------------------- ----------------- 149 ``__cpp_lib_shared_ptr_arrays`` ``201611L`` 150 ---------------------------------------------------------- ----------------- 151 ``__cpp_lib_shared_ptr_weak_type`` ``201606L`` 152 ---------------------------------------------------------- ----------------- 153 ``__cpp_lib_string_view`` ``201606L`` 154 ---------------------------------------------------------- ----------------- 155 ``__cpp_lib_to_chars`` *unimplemented* 156 ---------------------------------------------------------- ----------------- 157 ``__cpp_lib_transparent_operators`` ``201510L`` 158 ---------------------------------------------------------- ----------------- 159 ``__cpp_lib_type_trait_variable_templates`` ``201510L`` 160 ---------------------------------------------------------- ----------------- 161 ``__cpp_lib_uncaught_exceptions`` ``201411L`` 162 ---------------------------------------------------------- ----------------- 163 ``__cpp_lib_unordered_map_try_emplace`` ``201411L`` 164 ---------------------------------------------------------- ----------------- 165 ``__cpp_lib_variant`` ``202102L`` 166 ---------------------------------------------------------- ----------------- 167 ``__cpp_lib_void_t`` ``201411L`` 168 ---------------------------------------------------------- ----------------- 169 **C++20** 170 ---------------------------------------------------------------------------- 171 ``__cpp_lib_array_constexpr`` ``201811L`` 172 ---------------------------------------------------------- ----------------- 173 ``__cpp_lib_assume_aligned`` ``201811L`` 174 ---------------------------------------------------------- ----------------- 175 ``__cpp_lib_atomic_flag_test`` ``201907L`` 176 ---------------------------------------------------------- ----------------- 177 ``__cpp_lib_atomic_float`` *unimplemented* 178 ---------------------------------------------------------- ----------------- 179 ``__cpp_lib_atomic_lock_free_type_aliases`` ``201907L`` 180 ---------------------------------------------------------- ----------------- 181 ``__cpp_lib_atomic_ref`` ``201806L`` 182 ---------------------------------------------------------- ----------------- 183 ``__cpp_lib_atomic_shared_ptr`` *unimplemented* 184 ---------------------------------------------------------- ----------------- 185 ``__cpp_lib_atomic_value_initialization`` ``201911L`` 186 ---------------------------------------------------------- ----------------- 187 ``__cpp_lib_atomic_wait`` ``201907L`` 188 ---------------------------------------------------------- ----------------- 189 ``__cpp_lib_barrier`` ``201907L`` 190 ---------------------------------------------------------- ----------------- 191 ``__cpp_lib_bind_front`` ``201907L`` 192 ---------------------------------------------------------- ----------------- 193 ``__cpp_lib_bit_cast`` ``201806L`` 194 ---------------------------------------------------------- ----------------- 195 ``__cpp_lib_bitops`` ``201907L`` 196 ---------------------------------------------------------- ----------------- 197 ``__cpp_lib_bounded_array_traits`` ``201902L`` 198 ---------------------------------------------------------- ----------------- 199 ``__cpp_lib_char8_t`` ``201907L`` 200 ---------------------------------------------------------- ----------------- 201 ``__cpp_lib_concepts`` ``202002L`` 202 ---------------------------------------------------------- ----------------- 203 ``__cpp_lib_constexpr_algorithms`` ``201806L`` 204 ---------------------------------------------------------- ----------------- 205 ``__cpp_lib_constexpr_complex`` ``201711L`` 206 ---------------------------------------------------------- ----------------- 207 ``__cpp_lib_constexpr_dynamic_alloc`` ``201907L`` 208 ---------------------------------------------------------- ----------------- 209 ``__cpp_lib_constexpr_functional`` ``201907L`` 210 ---------------------------------------------------------- ----------------- 211 ``__cpp_lib_constexpr_iterator`` ``201811L`` 212 ---------------------------------------------------------- ----------------- 213 ``__cpp_lib_constexpr_memory`` ``201811L`` 214 ---------------------------------------------------------- ----------------- 215 ``__cpp_lib_constexpr_numeric`` ``201911L`` 216 ---------------------------------------------------------- ----------------- 217 ``__cpp_lib_constexpr_string`` ``201907L`` 218 ---------------------------------------------------------- ----------------- 219 ``__cpp_lib_constexpr_string_view`` ``201811L`` 220 ---------------------------------------------------------- ----------------- 221 ``__cpp_lib_constexpr_tuple`` ``201811L`` 222 ---------------------------------------------------------- ----------------- 223 ``__cpp_lib_constexpr_utility`` ``201811L`` 224 ---------------------------------------------------------- ----------------- 225 ``__cpp_lib_constexpr_vector`` ``201907L`` 226 ---------------------------------------------------------- ----------------- 227 ``__cpp_lib_coroutine`` ``201902L`` 228 ---------------------------------------------------------- ----------------- 229 ``__cpp_lib_destroying_delete`` ``201806L`` 230 ---------------------------------------------------------- ----------------- 231 ``__cpp_lib_endian`` ``201907L`` 232 ---------------------------------------------------------- ----------------- 233 ``__cpp_lib_erase_if`` ``202002L`` 234 ---------------------------------------------------------- ----------------- 235 ``__cpp_lib_execution`` *unimplemented* 236 ---------------------------------------------------------- ----------------- 237 ``__cpp_lib_format`` ``202110L`` 238 ---------------------------------------------------------- ----------------- 239 ``__cpp_lib_format_uchar`` ``202311L`` 240 ---------------------------------------------------------- ----------------- 241 ``__cpp_lib_generic_unordered_lookup`` ``201811L`` 242 ---------------------------------------------------------- ----------------- 243 ``__cpp_lib_int_pow2`` ``202002L`` 244 ---------------------------------------------------------- ----------------- 245 ``__cpp_lib_integer_comparison_functions`` ``202002L`` 246 ---------------------------------------------------------- ----------------- 247 ``__cpp_lib_interpolate`` ``201902L`` 248 ---------------------------------------------------------- ----------------- 249 ``__cpp_lib_is_constant_evaluated`` ``201811L`` 250 ---------------------------------------------------------- ----------------- 251 ``__cpp_lib_is_layout_compatible`` *unimplemented* 252 ---------------------------------------------------------- ----------------- 253 ``__cpp_lib_is_nothrow_convertible`` ``201806L`` 254 ---------------------------------------------------------- ----------------- 255 ``__cpp_lib_is_pointer_interconvertible`` *unimplemented* 256 ---------------------------------------------------------- ----------------- 257 ``__cpp_lib_jthread`` ``201911L`` 258 ---------------------------------------------------------- ----------------- 259 ``__cpp_lib_latch`` ``201907L`` 260 ---------------------------------------------------------- ----------------- 261 ``__cpp_lib_list_remove_return_type`` ``201806L`` 262 ---------------------------------------------------------- ----------------- 263 ``__cpp_lib_math_constants`` ``201907L`` 264 ---------------------------------------------------------- ----------------- 265 ``__cpp_lib_move_iterator_concept`` ``202207L`` 266 ---------------------------------------------------------- ----------------- 267 ``__cpp_lib_optional`` ``202106L`` 268 ---------------------------------------------------------- ----------------- 269 ``__cpp_lib_polymorphic_allocator`` ``201902L`` 270 ---------------------------------------------------------- ----------------- 271 ``__cpp_lib_ranges`` ``202110L`` 272 ---------------------------------------------------------- ----------------- 273 ``__cpp_lib_remove_cvref`` ``201711L`` 274 ---------------------------------------------------------- ----------------- 275 ``__cpp_lib_semaphore`` ``201907L`` 276 ---------------------------------------------------------- ----------------- 277 ``__cpp_lib_shared_ptr_arrays`` ``201707L`` 278 ---------------------------------------------------------- ----------------- 279 ``__cpp_lib_shift`` ``201806L`` 280 ---------------------------------------------------------- ----------------- 281 ``__cpp_lib_smart_ptr_for_overwrite`` ``202002L`` 282 ---------------------------------------------------------- ----------------- 283 ``__cpp_lib_source_location`` ``201907L`` 284 ---------------------------------------------------------- ----------------- 285 ``__cpp_lib_span`` ``202002L`` 286 ---------------------------------------------------------- ----------------- 287 ``__cpp_lib_ssize`` ``201902L`` 288 ---------------------------------------------------------- ----------------- 289 ``__cpp_lib_starts_ends_with`` ``201711L`` 290 ---------------------------------------------------------- ----------------- 291 ``__cpp_lib_string_view`` ``201803L`` 292 ---------------------------------------------------------- ----------------- 293 ``__cpp_lib_syncbuf`` ``201803L`` 294 ---------------------------------------------------------- ----------------- 295 ``__cpp_lib_three_way_comparison`` ``201907L`` 296 ---------------------------------------------------------- ----------------- 297 ``__cpp_lib_to_address`` ``201711L`` 298 ---------------------------------------------------------- ----------------- 299 ``__cpp_lib_to_array`` ``201907L`` 300 ---------------------------------------------------------- ----------------- 301 ``__cpp_lib_type_identity`` ``201806L`` 302 ---------------------------------------------------------- ----------------- 303 ``__cpp_lib_unwrap_ref`` ``201811L`` 304 ---------------------------------------------------------- ----------------- 305 ``__cpp_lib_variant`` ``202106L`` 306 ---------------------------------------------------------- ----------------- 307 **C++23** 308 ---------------------------------------------------------------------------- 309 ``__cpp_lib_adaptor_iterator_pair_constructor`` ``202106L`` 310 ---------------------------------------------------------- ----------------- 311 ``__cpp_lib_allocate_at_least`` ``202302L`` 312 ---------------------------------------------------------- ----------------- 313 ``__cpp_lib_associative_heterogeneous_erasure`` *unimplemented* 314 ---------------------------------------------------------- ----------------- 315 ``__cpp_lib_bind_back`` ``202202L`` 316 ---------------------------------------------------------- ----------------- 317 ``__cpp_lib_byteswap`` ``202110L`` 318 ---------------------------------------------------------- ----------------- 319 ``__cpp_lib_constexpr_bitset`` ``202207L`` 320 ---------------------------------------------------------- ----------------- 321 ``__cpp_lib_constexpr_charconv`` ``202207L`` 322 ---------------------------------------------------------- ----------------- 323 ``__cpp_lib_constexpr_cmath`` *unimplemented* 324 ---------------------------------------------------------- ----------------- 325 ``__cpp_lib_constexpr_memory`` ``202202L`` 326 ---------------------------------------------------------- ----------------- 327 ``__cpp_lib_constexpr_typeinfo`` ``202106L`` 328 ---------------------------------------------------------- ----------------- 329 ``__cpp_lib_containers_ranges`` ``202202L`` 330 ---------------------------------------------------------- ----------------- 331 ``__cpp_lib_expected`` ``202211L`` 332 ---------------------------------------------------------- ----------------- 333 ``__cpp_lib_flat_map`` ``202207L`` 334 ---------------------------------------------------------- ----------------- 335 ``__cpp_lib_flat_set`` *unimplemented* 336 ---------------------------------------------------------- ----------------- 337 ``__cpp_lib_format_ranges`` ``202207L`` 338 ---------------------------------------------------------- ----------------- 339 ``__cpp_lib_formatters`` *unimplemented* 340 ---------------------------------------------------------- ----------------- 341 ``__cpp_lib_forward_like`` ``202207L`` 342 ---------------------------------------------------------- ----------------- 343 ``__cpp_lib_invoke_r`` ``202106L`` 344 ---------------------------------------------------------- ----------------- 345 ``__cpp_lib_ios_noreplace`` ``202207L`` 346 ---------------------------------------------------------- ----------------- 347 ``__cpp_lib_is_implicit_lifetime`` ``202302L`` 348 ---------------------------------------------------------- ----------------- 349 ``__cpp_lib_is_scoped_enum`` ``202011L`` 350 ---------------------------------------------------------- ----------------- 351 ``__cpp_lib_mdspan`` ``202207L`` 352 ---------------------------------------------------------- ----------------- 353 ``__cpp_lib_modules`` ``202207L`` 354 ---------------------------------------------------------- ----------------- 355 ``__cpp_lib_move_only_function`` *unimplemented* 356 ---------------------------------------------------------- ----------------- 357 ``__cpp_lib_optional`` ``202110L`` 358 ---------------------------------------------------------- ----------------- 359 ``__cpp_lib_out_ptr`` ``202106L`` 360 ---------------------------------------------------------- ----------------- 361 ``__cpp_lib_print`` ``202207L`` 362 ---------------------------------------------------------- ----------------- 363 ``__cpp_lib_ranges`` ``202406L`` 364 ---------------------------------------------------------- ----------------- 365 ``__cpp_lib_ranges_as_const`` *unimplemented* 366 ---------------------------------------------------------- ----------------- 367 ``__cpp_lib_ranges_as_rvalue`` ``202207L`` 368 ---------------------------------------------------------- ----------------- 369 ``__cpp_lib_ranges_chunk`` *unimplemented* 370 ---------------------------------------------------------- ----------------- 371 ``__cpp_lib_ranges_chunk_by`` ``202202L`` 372 ---------------------------------------------------------- ----------------- 373 ``__cpp_lib_ranges_contains`` ``202207L`` 374 ---------------------------------------------------------- ----------------- 375 ``__cpp_lib_ranges_find_last`` ``202207L`` 376 ---------------------------------------------------------- ----------------- 377 ``__cpp_lib_ranges_iota`` *unimplemented* 378 ---------------------------------------------------------- ----------------- 379 ``__cpp_lib_ranges_join_with`` *unimplemented* 380 ---------------------------------------------------------- ----------------- 381 ``__cpp_lib_ranges_repeat`` ``202207L`` 382 ---------------------------------------------------------- ----------------- 383 ``__cpp_lib_ranges_slide`` *unimplemented* 384 ---------------------------------------------------------- ----------------- 385 ``__cpp_lib_ranges_starts_ends_with`` ``202106L`` 386 ---------------------------------------------------------- ----------------- 387 ``__cpp_lib_ranges_to_container`` ``202202L`` 388 ---------------------------------------------------------- ----------------- 389 ``__cpp_lib_ranges_zip`` *unimplemented* 390 ---------------------------------------------------------- ----------------- 391 ``__cpp_lib_reference_from_temporary`` *unimplemented* 392 ---------------------------------------------------------- ----------------- 393 ``__cpp_lib_spanstream`` *unimplemented* 394 ---------------------------------------------------------- ----------------- 395 ``__cpp_lib_stacktrace`` *unimplemented* 396 ---------------------------------------------------------- ----------------- 397 ``__cpp_lib_stdatomic_h`` ``202011L`` 398 ---------------------------------------------------------- ----------------- 399 ``__cpp_lib_string_contains`` ``202011L`` 400 ---------------------------------------------------------- ----------------- 401 ``__cpp_lib_string_resize_and_overwrite`` ``202110L`` 402 ---------------------------------------------------------- ----------------- 403 ``__cpp_lib_to_underlying`` ``202102L`` 404 ---------------------------------------------------------- ----------------- 405 ``__cpp_lib_tuple_like`` *unimplemented* 406 ---------------------------------------------------------- ----------------- 407 ``__cpp_lib_unreachable`` ``202202L`` 408 ---------------------------------------------------------- ----------------- 409 **C++26** 410 ---------------------------------------------------------------------------- 411 ``__cpp_lib_associative_heterogeneous_insertion`` *unimplemented* 412 ---------------------------------------------------------- ----------------- 413 ``__cpp_lib_atomic_min_max`` *unimplemented* 414 ---------------------------------------------------------- ----------------- 415 ``__cpp_lib_bind_front`` ``202306L`` 416 ---------------------------------------------------------- ----------------- 417 ``__cpp_lib_bitset`` ``202306L`` 418 ---------------------------------------------------------- ----------------- 419 ``__cpp_lib_constexpr_new`` ``202406L`` 420 ---------------------------------------------------------- ----------------- 421 ``__cpp_lib_constrained_equality`` *unimplemented* 422 ---------------------------------------------------------- ----------------- 423 ``__cpp_lib_copyable_function`` *unimplemented* 424 ---------------------------------------------------------- ----------------- 425 ``__cpp_lib_debugging`` *unimplemented* 426 ---------------------------------------------------------- ----------------- 427 ``__cpp_lib_default_template_type_for_algorithm_values`` *unimplemented* 428 ---------------------------------------------------------- ----------------- 429 ``__cpp_lib_format_path`` *unimplemented* 430 ---------------------------------------------------------- ----------------- 431 ``__cpp_lib_freestanding_algorithm`` *unimplemented* 432 ---------------------------------------------------------- ----------------- 433 ``__cpp_lib_freestanding_array`` *unimplemented* 434 ---------------------------------------------------------- ----------------- 435 ``__cpp_lib_freestanding_cstring`` *unimplemented* 436 ---------------------------------------------------------- ----------------- 437 ``__cpp_lib_freestanding_expected`` *unimplemented* 438 ---------------------------------------------------------- ----------------- 439 ``__cpp_lib_freestanding_mdspan`` *unimplemented* 440 ---------------------------------------------------------- ----------------- 441 ``__cpp_lib_freestanding_optional`` *unimplemented* 442 ---------------------------------------------------------- ----------------- 443 ``__cpp_lib_freestanding_string_view`` *unimplemented* 444 ---------------------------------------------------------- ----------------- 445 ``__cpp_lib_freestanding_variant`` *unimplemented* 446 ---------------------------------------------------------- ----------------- 447 ``__cpp_lib_fstream_native_handle`` ``202306L`` 448 ---------------------------------------------------------- ----------------- 449 ``__cpp_lib_function_ref`` *unimplemented* 450 ---------------------------------------------------------- ----------------- 451 ``__cpp_lib_generate_random`` *unimplemented* 452 ---------------------------------------------------------- ----------------- 453 ``__cpp_lib_hazard_pointer`` *unimplemented* 454 ---------------------------------------------------------- ----------------- 455 ``__cpp_lib_inplace_vector`` *unimplemented* 456 ---------------------------------------------------------- ----------------- 457 ``__cpp_lib_is_virtual_base_of`` ``202406L`` 458 ---------------------------------------------------------- ----------------- 459 ``__cpp_lib_is_within_lifetime`` *unimplemented* 460 ---------------------------------------------------------- ----------------- 461 ``__cpp_lib_linalg`` *unimplemented* 462 ---------------------------------------------------------- ----------------- 463 ``__cpp_lib_mdspan`` ``202406L`` 464 ---------------------------------------------------------- ----------------- 465 ``__cpp_lib_not_fn`` ``202306L`` 466 ---------------------------------------------------------- ----------------- 467 ``__cpp_lib_optional_range_support`` *unimplemented* 468 ---------------------------------------------------------- ----------------- 469 ``__cpp_lib_out_ptr`` ``202311L`` 470 ---------------------------------------------------------- ----------------- 471 ``__cpp_lib_philox_engine`` *unimplemented* 472 ---------------------------------------------------------- ----------------- 473 ``__cpp_lib_ranges_concat`` *unimplemented* 474 ---------------------------------------------------------- ----------------- 475 ``__cpp_lib_ratio`` ``202306L`` 476 ---------------------------------------------------------- ----------------- 477 ``__cpp_lib_rcu`` *unimplemented* 478 ---------------------------------------------------------- ----------------- 479 ``__cpp_lib_reference_wrapper`` ``202403L`` 480 ---------------------------------------------------------- ----------------- 481 ``__cpp_lib_saturation_arithmetic`` ``202311L`` 482 ---------------------------------------------------------- ----------------- 483 ``__cpp_lib_senders`` *unimplemented* 484 ---------------------------------------------------------- ----------------- 485 ``__cpp_lib_smart_ptr_owner_equality`` *unimplemented* 486 ---------------------------------------------------------- ----------------- 487 ``__cpp_lib_span_at`` ``202311L`` 488 ---------------------------------------------------------- ----------------- 489 ``__cpp_lib_span_initializer_list`` ``202311L`` 490 ---------------------------------------------------------- ----------------- 491 ``__cpp_lib_sstream_from_string_view`` ``202306L`` 492 ---------------------------------------------------------- ----------------- 493 ``__cpp_lib_string_view`` ``202403L`` 494 ---------------------------------------------------------- ----------------- 495 ``__cpp_lib_submdspan`` *unimplemented* 496 ---------------------------------------------------------- ----------------- 497 ``__cpp_lib_text_encoding`` *unimplemented* 498 ---------------------------------------------------------- ----------------- 499 ``__cpp_lib_to_chars`` *unimplemented* 500 ---------------------------------------------------------- ----------------- 501 ``__cpp_lib_to_string`` *unimplemented* 502 ---------------------------------------------------------- ----------------- 503 ``__cpp_lib_tuple_like`` *unimplemented* 504 ---------------------------------------------------------- ----------------- 505 ``__cpp_lib_variant`` ``202306L`` 506 ========================================================== ================= 507 508