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@StephanTLavavej StephanTLavavej released this 21 May 22:29
· 231 commits to main since this release
vs-2022-17.10
d6efe94
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Learn about vigilant mode.
  • Merged C++26 features:
  • Merged C++23 features:
    • P2836R1 #4188 basic_const_iterator Should Follow Its Underlying Type's Convertibility
  • Merged partial C++23 features:
    • P2286R8 Formatting Ranges:
      • Implemented formatter<vector<bool>::reference>. #4133
  • Merged C++20 Defect Reports:
  • Merged LWG issue resolutions:
    • LWG-3749 #4190 common_iterator should handle integer-class difference types
    • LWG-3809 #4194 Is subtract_with_carry_engine<uint16_t> supposed to work?
    • LWG-3897 #4186 inout_ptr will not update raw pointer to null
    • LWG-3946 #4187 The definition of const_iterator_t should be reworked
    • LWG-3947 #4195 Unexpected constraints on adjacent_transform_view::base()
    • LWG-3949 #4204 atomic<bool>'s trivial destructor dropped in C++17 spec wording
    • LWG-3953 #4167 iter_move for common_iterator and counted_iterator should return decltype(auto)
    • LWG-3974 #4214 mdspan::operator[] should not copy OtherIndexTypes
    • LWG-4001 #4193 iota_view should provide empty
  • Fixed bugs:
    • Fixed mutex's constructor to be constexpr. #3824 #4000 #4339
      • Note: Programs that aren't following the documented restrictions on binary compatibility may encounter null dereferences in mutex machinery. You must follow this rule:

        When you mix binaries built by different supported versions of the toolset, the Redistributable version must be at least as new as the latest toolset used by any app component.

      • You can define _DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR as an escape hatch.
    • Fixed <format>'s compile-time format string checking:
      • To detect when user-defined formatter specializations reject omitted format specifications like "{}". #4078
      • To require that dynamic width and precision arguments have integral types. #4155
    • Fixed how format() handles empty strings like format("{:a<10}", ""). #4243
    • Fixed <format> to properly handle floating-point values in a specific situation. When a format-specifier appears without any precision or type, shortest round-trip formatting should be used instead of chars_format::general. #4327
      • Example format strings: "{:}" and "{0:}" were affected, as they have an optional arg-id (0) followed by a format-specifier (:) with an empty format-spec (nothing after the :).
      • More common format strings like "{}" and "{0}" were unaffected, as they entirely lack a format-specifier.
      • Example value: For 12345678.0, the shortest round-trip rules produce "12345678", while the chars_format::general rules produce "1.2345678e+07".
    • Fixed <format> to properly handle locale-specific floating-point formatting with a minimum field width, taking digit separators into account. #4421
    • Fixed format() to accept %X and %EX for chrono::duration and chrono::hh_mm_ss. #4250
    • Fixed chrono::duration formatting to respect dynamically provided widths. #4283
    • Fixed crashes and incorrect results in the vectorized implementation of ranges::find with unreachable_sentinel. #4450
      • This fixed regressions that were introduced by #2434 in VS 2022 17.3.
    • Fixed ranges::to to properly reject certain invalid uses with compiler errors, instead of trapping compilers in infinite loops of doom. #4142
    • Fixed ranges::to to accept certain container constructors taking a range followed by more than one argument. #4218
    • Fixed compiler errors involving range adaptor closure objects in unusual scenarios. #4211
    • Fixed ranges::ssize to be conditionally noexcept as required by the Standard. #4231
    • Fixed join_view and join_with_view's iterators to be default constructible. #4264
    • Fixed truncation warnings when using views::repeat. #4255
    • Fixed compiler errors when using views::zip_transform with ranges that must be non-const to be iterated through, such as views::filter. #4416
    • Fixed compiler errors when using views::pairwise_transform and views::adjacent_transform via Standard Library Modules. #4420
    • Fixed incorrect output from iostreams (like "i.nf") when printing infinity and NaN values with setprecision(0) << showpoint << fixed. #4212
    • Fixed problems involving unusual allocators with size types other than size_t:
      • Compiler errors in basic_stringbuf::overflow(). #4219
      • Truncation warnings in basic_stringbuf's constructor, string/vector iterator subtraction, ranges::is_permutation, and allocate_shared(). #4228 #4237 #4252
    • Fixed <atomic> correctness issues for ARM64 CHPE (_M_HYBRID_X86_ARM64). #4222
    • Fixed atomic by adding atomic& operator=(const atomic&) volatile = delete; as required by the Standard. #4287
    • Fixed atomic<shared_ptr>::wait() and atomic<weak_ptr>::wait() to properly detect equivalent smart pointers. #3655
    • Fixed sign-compare warnings in <mdspan> when using extents with different index types. #4227
    • Fixed compiler errors in <mdspan> when constructing unusual mappings. #4236
    • Fixed bugs specific to extremely unusual fancy pointers:
      • Fixed how such vectors interact with ranges algorithms. #4244
      • Fixed how such vectors and basic_strings interact with classic algorithms and iterator spaceship comparisons. #4275
    • Fixed compiler errors when constructing locale{nullptr}. #4245
      • Rejoice, for now you can get a guaranteed runtime_error!
    • Fixed compiler errors when overloading next(), prev(), shift_left(), and shift_right() with concept-constrained functions that should be preferred during overload resolution. #4249
    • Fixed compiler errors when comparing a sub_match with the spaceship operator <=> to a basic_string with a custom traits and/or allocator type. #4253
    • Fixed sequence container constructors to avoid interfering with CTAD (class template argument deduction) for (Iter, Iter, BadAlloc); now this will SFINAE away instead of emitting a hard compiler error. #4254
    • Fixed compiler errors in parallel transform_reduce() when performing narrowing conversions. #4260
      • As usual, asking the STL to perform conversions on your behalf may emit sign/truncation compiler warnings; this is by design.
    • Fixed compiler errors during constexpr evaluation of vector<bool> caused by improper casting in iterator debugging machinery. #4276
    • Fixed compiler errors (by adding a compiler bug workaround) when using constexpr invoke() to call pointers to data members with reference_wrapper arguments. #4277
    • Added macroization defenses for the STL's non-Standard extensions (e.g. type_info's raw_name member function). #4285
    • Fixed floating-point to_chars() on ARM64 to return correct results. #4304
    • Fixed compiler errors when defining variadic alias templates for is_nothrow_convertible. #4318
    • Fixed filesystem::is_empty() and filesystem::directory_iterator to handle empty volumes (before they've been assigned a drive letter). #4311
    • Fixed compiler errors in algorithms involving highly unusual types. #4233 #4419
    • Fixed basic_stringbuf to avoid implementing moving with swapping, which is a correctness issue for unusual custom allocators. #4239
    • Fixed deque::shrink_to_fit() to follow the Standard instead of unconditionally moving elements. #4091
    • Fixed allocate_shared_for_overwrite() to directly destroy objects, instead of using Alloc::destroy(). #4274
    • Removed ios_base::hexfloat, a non-Standard bitmask element. #4345
      • The Standard ways to request hexadecimal floating-point output are to use the ios_base::fixed | ios_base::scientific bitmask elements together or to use the std::hexfloat manipulator.
    • Fixed std.ixx to export VCRuntime machinery with Standard-conforming techniques. #4375
      • This affects things like std::exception, std::type_info, and ::operator new. The MSVC compiler currently doesn't enforce the rule in question here, but stricter tools might notice this.
    • Fixed basic_ostream::operator<<(basic_streambuf*) to rethrow caught exceptions only when failbit is set in exceptions(). #4372
    • Fixed unordered_map and unordered_set's equality operators to test elements for equality (via their operator==), not just equivalence (via the container's predicate for keys). #4406
      • unordered_multimap and unordered_multiset already behaved correctly.
    • Silenced "warning C4324: structure was padded due to alignment specifier" in all STL headers. #4426
      • This was spuriously emitted by certain combinations of code, e.g. views::cartesian_product with views::filter.
    • Fixed time_get::date_order() to correctly return time_base::mdy for the "C" locale, instead of picking up the date order for the current user locale. #4437
    • Fixed seed_seq::generate(RanIt, RanIt) to static_assert that the iterator's value type is at least a 32-bit unsigned integer type. #4447
    • Fixed compiler errors involving incomplete types in:
      • Non-modifying algorithms. #4138
      • erase(), erase_if(), remove(), remove_if(). #4217
      • [alg.min.max], [alg.clamp], [alg.lex.comparison], [alg.three.way] algorithms. #4216
      • atomic and atomic_ref. #4221
      • Modifying algorithms. #4256
      • Container operations taking iterator pairs. #4258
      • is_nothrow_convertible. #4318
      • Comparison operators. #4334
      • Merge algorithms, set operations, heap operations, and permutation generators. #4347
      • Sorting and related algorithms. #4367
      • vector's destructor and other member functions. #4373
      • Uninitialized memory algorithms. #4374
      • default_searcher. #4379
      • <ranges> views. #4389
      • Numeric algorithms. #4391
      • ranges::advance, ranges::distance, span constructors, and condition_variable::wait_for. #4402
      • shared_ptr creation functions and atomic smart pointers. #4403
      • function, move_only_function, packaged_task, promise, and optional. #4430
  • Improved performance:
    • Improved <atomic> performance: #4222
      • For ARM64, significantly improved the performance of atomic<T>::load() (taking no arguments, requesting sequential consistency), matching how #3399 in VS 2022 17.6 improved atomic<T>::load(memory_order_seq_cst).
      • For ARM64 CHPE (_M_HYBRID_X86_ARM64), atomic<T>'s exchange/compare_exchange_MEOW/fetch_MEOW now respect memory_order arguments instead of always providing sequential consistency. Also, ARM64 CHPE now benefits from all of #3399's major improvements.
    • Improved atomic::wait family performance by internally using memory_order_acq_rel instead of memory_order_seq_cst when initializing OS support functions. #4288
    • Slightly improved the codegen for uniform_int_distribution. #4234
    • Optimized filesystem::path's operator/ to perform a single memory allocation for common cases. #4136
    • Slightly improved performance by taking advantage of P1169R4 static operator() in the STL's stateless function objects and lambdas. #4358
      • This is conditional on compiler feature availability (currently implemented by Clang), but not on Standard mode. Like C++17 if constexpr and C++20 explicit(bool), compilers will support C++23 static operator() in earlier Standard modes (emitting warnings that Future Technology is being used, which the STL internally suppresses).
    • Added a vectorized implementation of bitset::to_string(). #3960 #4382 #4422
    • Improved the vectorized implementations of min_element(), max_element(), minmax_element(), and related algorithms:
      • Extended them to handle floating-point types. #3928
      • Further improved performance by restructuring control flow. #4401
    • Improved the vectorized implementations of ranges::min, ranges::max, ranges::minmax, and the min(), max(), and minmax() overloads for initializer_list. #4384
      • These algorithms only need to track values, not locations.
    • Changed the destructors of mutex and recursive_mutex to be trivial. #4390
      • This especially benefits variables with static storage duration, as they no longer need "dynamic atexit destructors".
    • Slightly improved performance by replacing CRITICAL_SECTION with SRWLOCK in:
      • get_new_handler() and set_new_handler(). #4407
      • At-thread-exit machinery. #4408
  • Enhanced behavior:
    • Wrapped the STL in extern "C++" as a temporary workaround to allow #include <meow> to coexist with import std; in the same translation unit, in that order. #4154
      • The other order, import std; before #include <meow>, will still cause compiler errors. We're working on a long-term solution.
    • The C++17 Standard added invoke() and the C++20 Standard made it constexpr. Previously, MSVC made non-constexpr invoke() unconditionally available, and constexpr invoke() available in C++17 mode, as minor extensions. Now, constexpr invoke() is unconditionally available. #4080
    • Improved shared_ptr constructor constraints to avoid forming invalid types. #4290
    • Updated <charconv> to use the __umulh intrinsic for ARM64 CHPE (_M_HYBRID_X86_ARM64). #4330
    • Improved expected's copy/move assignment operators to be trivial when possible, like how optional and variant already behave. #4271
    • Improved <random>'s TR1 legacy code: #4284
      • Deprecated the non-Standard engines (discard_block, linear_congruential, mersenne_twister, subtract_with_carry) and distributions (uniform_int, uniform_real) that are still provided in the std namespace.
      • Removed non-Standard machinery from Standard engines and distributions. (For example, certain static constexpr data members in mersenne_twister_engine and an extra function call operator overload in uniform_int_distribution.)
    • Changed basic_regex's constructor to throw an exception instead of stack overflowing when the pattern contains an excessive number of capture groups. #4451
      • Currently, this arbitrarily limits the number of capture groups to 1000.
  • Improved test coverage:
    • Updated the STL-ASan-CI pipeline. #4240 #4295
    • Added support for building the STL's separately compiled code with ASan instrumentation and enabled this in the STL-ASan-CI pipeline. #4313
    • Updated our LLVM submodule, including new tests. #4263 #4267 #4270 #4272 #4328 #4336 #4348 #4355
    • Minor test improvements, including printing exit codes in both decimal and hex. #4309
    • Improved output for "unresolved" test failures. #4323
    • Fixed sporadic "unresolved" test failures. #4366
    • Updated CTest to avoid running 2N tests in parallel, where N is the number of cores available. #4335
    • Enabled __cpp_lib_concepts for our command-line test coverage of the EDG compiler front-end. #4296 #4297 #4440
      • __cpp_lib_concepts was already enabled for EDG-powered IntelliSense in the VS IDE, so this change isn't directly observable by users, it'll just help the STL work better with IntelliSense in the future.
    • Enabled compiler warnings when building the STL's benchmarks. #4356
    • Added benchmarks for vectorized ranges::find and ranges::count. #4387
      • This also covers classic find() and count(), which share the same vectorized implementation.
    • Fixed the test harness to handle paths case-insensitively. #4395
    • Updated tests to work with Clang 18. #4452
    • Enabled more test coverage for the off-by-default warning C4668 "'MEOW' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif'". #4441
  • Code cleanups:
    • Various cleanups (described in detail in the PRs, not repeated here). #4143 #4145 #4146 #4147 #4149 #4151 #4192 #4229 #4230 #4362 #4439 #4442 #4443 #4444 #4445
    • Removed unnecessary typename keywords in C++20 mode and later. #4191
    • Removed compiler bug workarounds. #4197 #4259 #4340 #4392
    • Removed an enormous amount of code that was dealing with __cpp_lib_concepts missing in C++20 mode. #4298 #4364
      • Now, the STL's product and test code assumes that concepts are always available in C++20 mode, with targeted workarounds for reported compiler bugs.
    • Unified our internal stringizing macros. #4405
    • Added top-level const to function parameters in the vectorized implementations of algorithms. #4410
    • Added a script to download Unicode data files when updating <format>. #4435
    • Simplified how we handle Unicode field widths when updating <format>. Now we use a single script to process all Unicode data files, emitting tables into a single generated header. #4446
    • Used if constexpr to simplify helper functions for allocating and deallocating memory. #4432
  • Infrastructure improvements:
    • Updated dependencies. #4197 #4206 #4259 #4303 #4392
      • Updated build compiler to VS 2022 17.10 Preview 1 (now required).
      • Updated CMake to 3.28 (now required).
      • Updated Clang to 17.0.3 (now required).
      • Updated Python to 3.12.2.
      • Updated Boost.Math to 1.84.0. #4280
  • Updated _MSVC_STL_UPDATE. #4213 #4226 #4293 #4361
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