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 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef _LIBCPP___CONFIG
 #define _LIBCPP___CONFIG
 
 #include <__config_site>
 #include <__configuration/abi.h>
 #include <__configuration/availability.h>
 #include <__configuration/compiler.h>
 #include <__configuration/language.h>
 #include <__configuration/platform.h>
 
 #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
 #  pragma GCC system_header
 #endif
 
 #ifdef __cplusplus
 
 // The attributes supported by clang are documented at https://clang.llvm.org/docs/AttributeReference.html
 
 // _LIBCPP_VERSION represents the version of libc++, which matches the version of LLVM.
 // Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 17.0.1 == 17.00.01), _LIBCPP_VERSION is
 // defined to XXYYZZ.
 #  define _LIBCPP_VERSION 200100
 
 #  define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y
 #  define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y)
 #  define _LIBCPP_CONCAT3(X, Y, Z) _LIBCPP_CONCAT(X, _LIBCPP_CONCAT(Y, Z))
 
 #  if __STDC_HOSTED__ == 0
 #    define _LIBCPP_FREESTANDING
 #  endif
 
 // HARDENING {
 
 // TODO: Remove in LLVM 21. We're making this an error to catch folks who might not have migrated.
 #  ifdef _LIBCPP_ENABLE_ASSERTIONS
 #    error "_LIBCPP_ENABLE_ASSERTIONS has been removed, please use _LIBCPP_HARDENING_MODE instead"
 #  endif
 
 // The library provides the macro `_LIBCPP_HARDENING_MODE` which can be set to one of the following values:
 //
 // - `_LIBCPP_HARDENING_MODE_NONE`;
 // - `_LIBCPP_HARDENING_MODE_FAST`;
 // - `_LIBCPP_HARDENING_MODE_EXTENSIVE`;
 // - `_LIBCPP_HARDENING_MODE_DEBUG`.
 //
 // These values have the following effects:
 //
 // - `_LIBCPP_HARDENING_MODE_NONE` -- sets the hardening mode to "none" which disables all runtime hardening checks;
 //
 // - `_LIBCPP_HARDENING_MODE_FAST` -- sets that hardening mode to "fast". The fast mode enables security-critical checks
 //   that can be done with relatively little runtime overhead in constant time;
 //
 // - `_LIBCPP_HARDENING_MODE_EXTENSIVE` -- sets the hardening mode to "extensive". The extensive mode is a superset of
 //   the fast mode that additionally enables checks that are relatively cheap and prevent common types of logic errors
 //   but are not necessarily security-critical;
 //
 // - `_LIBCPP_HARDENING_MODE_DEBUG` -- sets the hardening mode to "debug". The debug mode is a superset of the extensive
 //   mode and enables all checks available in the library, including internal assertions. Checks that are part of the
 //   debug mode can be very expensive and thus the debug mode is intended to be used for testing, not in production.
 
 // Inside the library, assertions are categorized so they can be cherry-picked based on the chosen hardening mode. These
 // macros are only for internal use -- users should only pick one of the high-level hardening modes described above.
 //
 // - `_LIBCPP_ASSERT_VALID_INPUT_RANGE` -- checks that ranges (whether expressed as an iterator pair, an iterator and
 //   a sentinel, an iterator and a count, or a `std::range`) given as input to library functions are valid:
 //   - the sentinel is reachable from the begin iterator;
 //   - TODO(hardening): both iterators refer to the same container.
 //
 // - `_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS` -- checks that any attempts to access a container element, whether through
 //   the container object or through an iterator, are valid and do not attempt to go out of bounds or otherwise access
 //   a non-existent element. For iterator checks to work, bounded iterators must be enabled in the ABI. Types like
 //   `optional` and `function` are considered one-element containers for the purposes of this check.
 //
 // - `_LIBCPP_ASSERT_NON_NULL` -- checks that the pointer being dereferenced is not null. On most modern platforms zero
 //   address does not refer to an actual location in memory, so a null pointer dereference would not compromize the
 //   memory security of a program (however, it is still undefined behavior that can result in strange errors due to
 //   compiler optimizations).
 //
 // - `_LIBCPP_ASSERT_NON_OVERLAPPING_RANGES` -- for functions that take several ranges as arguments, checks that the
 //   given ranges do not overlap.
 //
 // - `_LIBCPP_ASSERT_VALID_DEALLOCATION` -- checks that an attempt to deallocate memory is valid (e.g. the given object
 //   was allocated by the given allocator). Violating this category typically results in a memory leak.
 //
 // - `_LIBCPP_ASSERT_VALID_EXTERNAL_API_CALL` -- checks that a call to an external API doesn't fail in
 //   an unexpected manner. This includes triggering documented cases of undefined behavior in an external library (like
 //   attempting to unlock an unlocked mutex in pthreads). Any API external to the library falls under this category
 //   (from system calls to compiler intrinsics). We generally don't expect these failures to compromize memory safety or
 //   otherwise create an immediate security issue.
 //
 // - `_LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR` -- checks any operations that exchange nodes between containers to make sure
 //   the containers have compatible allocators.
 //
 // - `_LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN` -- checks that the given argument is within the domain of valid arguments
 //   for the function. Violating this typically produces an incorrect result (e.g. the clamp algorithm returns the
 //   original value without clamping it due to incorrect functors) or puts an object into an invalid state (e.g.
 //   a string view where only a subset of elements is possible to access). This category is for assertions violating
 //   which doesn't cause any immediate issues in the library -- whatever the consequences are, they will happen in the
 //   user code.
 //
 // - `_LIBCPP_ASSERT_PEDANTIC` -- checks prerequisites which are imposed by the Standard, but violating which happens to
 //   be benign in our implementation.
 //
 // - `_LIBCPP_ASSERT_SEMANTIC_REQUIREMENT` -- checks that the given argument satisfies the semantic requirements imposed
 //   by the Standard. Typically, there is no simple way to completely prove that a semantic requirement is satisfied;
 //   thus, this would often be a heuristic check and it might be quite expensive.
 //
 // - `_LIBCPP_ASSERT_INTERNAL` -- checks that internal invariants of the library hold. These assertions don't depend on
 //   user input.
 //
 // - `_LIBCPP_ASSERT_UNCATEGORIZED` -- for assertions that haven't been properly classified yet.
 
 // clang-format off
 #  define _LIBCPP_HARDENING_MODE_NONE      (1 << 1)
 #  define _LIBCPP_HARDENING_MODE_FAST      (1 << 2)
 #  define _LIBCPP_HARDENING_MODE_EXTENSIVE (1 << 4) // Deliberately not ordered.
 #  define _LIBCPP_HARDENING_MODE_DEBUG     (1 << 3)
 // clang-format on
 
 #  ifndef _LIBCPP_HARDENING_MODE
 
 #    ifndef _LIBCPP_HARDENING_MODE_DEFAULT
 #      error _LIBCPP_HARDENING_MODE_DEFAULT is not defined. This definition should be set at configuration time in the \
 `__config_site` header, please make sure your installation of libc++ is not broken.
 #    endif
 
 #    define _LIBCPP_HARDENING_MODE _LIBCPP_HARDENING_MODE_DEFAULT
 #  endif
 
 #  if _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_NONE &&                                                         \
       _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_FAST &&                                                         \
       _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_EXTENSIVE &&                                                    \
       _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_DEBUG
 #    error _LIBCPP_HARDENING_MODE must be set to one of the following values: \
 _LIBCPP_HARDENING_MODE_NONE, \
 _LIBCPP_HARDENING_MODE_FAST, \
 _LIBCPP_HARDENING_MODE_EXTENSIVE, \
 _LIBCPP_HARDENING_MODE_DEBUG
 #  endif
 
 // } HARDENING
 
 #  define _LIBCPP_TOSTRING2(x) #x
 #  define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x)
 
 // NOLINTNEXTLINE(libcpp-cpp-version-check)
 #  if __cplusplus < 201103L
 #    define _LIBCPP_CXX03_LANG
 #  endif
 
 #  ifndef __has_constexpr_builtin
 #    define __has_constexpr_builtin(x) 0
 #  endif
 
 // This checks wheter a Clang module is built
 #  ifndef __building_module
 #    define __building_module(...) 0
 #  endif
 
 // '__is_identifier' returns '0' if '__x' is a reserved identifier provided by
 // the compiler and '1' otherwise.
 #  ifndef __is_identifier
 #    define __is_identifier(__x) 1
 #  endif
 
 #  ifndef __has_declspec_attribute
 #    define __has_declspec_attribute(__x) 0
 #  endif
 
 #  define __has_keyword(__x) !(__is_identifier(__x))
 
 #  ifndef __has_warning
 #    define __has_warning(...) 0
 #  endif
 
 #  if !defined(_LIBCPP_COMPILER_CLANG_BASED) && __cplusplus < 201103L
 #    error "libc++ only supports C++03 with Clang-based compilers. Please enable C++11"
 #  endif
 
 #  if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
 #    define _LIBCPP_ABI_VCRUNTIME
 #  endif
 
 #  if __has_feature(experimental_library)
 #    ifndef _LIBCPP_ENABLE_EXPERIMENTAL
 #      define _LIBCPP_ENABLE_EXPERIMENTAL
 #    endif
 #  endif
 
 // Incomplete features get their own specific disabling flags. This makes it
 // easier to grep for target specific flags once the feature is complete.
 #  if defined(_LIBCPP_ENABLE_EXPERIMENTAL) || defined(_LIBCPP_BUILDING_LIBRARY)
 #    define _LIBCPP_HAS_EXPERIMENTAL_LIBRARY 1
 #  else
 #    define _LIBCPP_HAS_EXPERIMENTAL_LIBRARY 0
 #  endif
 
 #  define _LIBCPP_HAS_EXPERIMENTAL_PSTL _LIBCPP_HAS_EXPERIMENTAL_LIBRARY
 #  define _LIBCPP_HAS_EXPERIMENTAL_TZDB _LIBCPP_HAS_EXPERIMENTAL_LIBRARY
 #  define _LIBCPP_HAS_EXPERIMENTAL_SYNCSTREAM _LIBCPP_HAS_EXPERIMENTAL_LIBRARY
 
 #  if defined(__MVS__)
 #    include <features.h> // for __NATIVE_ASCII_F
 #  endif
 
 #  if defined(_WIN32)
 #    define _LIBCPP_WIN32API
 #    define _LIBCPP_SHORT_WCHAR 1
 // Both MinGW and native MSVC provide a "MSVC"-like environment
 #    define _LIBCPP_MSVCRT_LIKE
 // If mingw not explicitly detected, assume using MS C runtime only if
 // a MS compatibility version is specified.
 #    if defined(_MSC_VER) && !defined(__MINGW32__)
 #      define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library
 #    endif
 #    if (defined(_M_AMD64) || defined(__x86_64__)) || (defined(_M_ARM) || defined(__arm__))
 #      define _LIBCPP_HAS_BITSCAN64 1
 #    else
 #      define _LIBCPP_HAS_BITSCAN64 0
 #    endif
 #    define _LIBCPP_HAS_OPEN_WITH_WCHAR 1
 #  else
 #    define _LIBCPP_HAS_OPEN_WITH_WCHAR 0
 #    define _LIBCPP_HAS_BITSCAN64 0
 #  endif // defined(_WIN32)
 
 #  if defined(_AIX) && !defined(__64BIT__)
 // The size of wchar is 2 byte on 32-bit mode on AIX.
 #    define _LIBCPP_SHORT_WCHAR 1
 #  endif
 
 // Libc++ supports various implementations of std::random_device.
 //
 // _LIBCPP_USING_DEV_RANDOM
 //      Read entropy from the given file, by default `/dev/urandom`.
 //      If a token is provided, it is assumed to be the path to a file
 //      to read entropy from. This is the default behavior if nothing
 //      else is specified. This implementation requires storing state
 //      inside `std::random_device`.
 //
 // _LIBCPP_USING_ARC4_RANDOM
 //      Use arc4random(). This allows obtaining random data even when
 //      using sandboxing mechanisms. On some platforms like Apple, this
 //      is the recommended source of entropy for user-space programs.
 //      When this option is used, the token passed to `std::random_device`'s
 //      constructor *must* be "/dev/urandom" -- anything else is an error.
 //
 // _LIBCPP_USING_GETENTROPY
 //      Use getentropy().
 //      When this option is used, the token passed to `std::random_device`'s
 //      constructor *must* be "/dev/urandom" -- anything else is an error.
 //
 // _LIBCPP_USING_FUCHSIA_CPRNG
 //      Use Fuchsia's zx_cprng_draw() system call, which is specified to
 //      deliver high-quality entropy and cannot fail.
 //      When this option is used, the token passed to `std::random_device`'s
 //      constructor *must* be "/dev/urandom" -- anything else is an error.
 //
 // _LIBCPP_USING_NACL_RANDOM
 //      NaCl's sandbox (which PNaCl also runs in) doesn't allow filesystem access,
 //      including accesses to the special files under `/dev`. This implementation
 //      uses the NaCL syscall `nacl_secure_random_init()` to get entropy.
 //      When this option is used, the token passed to `std::random_device`'s
 //      constructor *must* be "/dev/urandom" -- anything else is an error.
 //
 // _LIBCPP_USING_WIN32_RANDOM
 //      Use rand_s(), for use on Windows.
 //      When this option is used, the token passed to `std::random_device`'s
 //      constructor *must* be "/dev/urandom" -- anything else is an error.
 #  if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) ||                     \
       defined(__DragonFly__)
 #    define _LIBCPP_USING_ARC4_RANDOM
 #  elif defined(__wasi__) || defined(__EMSCRIPTEN__)
 #    define _LIBCPP_USING_GETENTROPY
 #  elif defined(__Fuchsia__)
 #    define _LIBCPP_USING_FUCHSIA_CPRNG
 #  elif defined(__native_client__)
 #    define _LIBCPP_USING_NACL_RANDOM
 #  elif defined(_LIBCPP_WIN32API)
 #    define _LIBCPP_USING_WIN32_RANDOM
 #  else
 #    define _LIBCPP_USING_DEV_RANDOM
 #  endif
 
 #  ifndef _LIBCPP_CXX03_LANG
 
 #    define _LIBCPP_ALIGNOF(_Tp) alignof(_Tp)
 #    define _ALIGNAS_TYPE(x) alignas(x)
 #    define _ALIGNAS(x) alignas(x)
 #    define _NOEXCEPT noexcept
 #    define _NOEXCEPT_(...) noexcept(__VA_ARGS__)
 #    define _LIBCPP_CONSTEXPR constexpr
 
 #  else
 
 #    define _LIBCPP_ALIGNOF(_Tp) _Alignof(_Tp)
 #    define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))
 #    define _ALIGNAS(x) __attribute__((__aligned__(x)))
 #    define nullptr __nullptr
 #    define _NOEXCEPT throw()
 #    define _NOEXCEPT_(...)
 #    define static_assert(...) _Static_assert(__VA_ARGS__)
 #    define decltype(...) __decltype(__VA_ARGS__)
 #    define _LIBCPP_CONSTEXPR
 
 typedef __char16_t char16_t;
 typedef __char32_t char32_t;
 
 #  endif
 
 #  define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp)
 
 // Objective-C++ features (opt-in)
 #  if __has_feature(objc_arc)
 #    define _LIBCPP_HAS_OBJC_ARC 1
 #  else
 #    define _LIBCPP_HAS_OBJC_ARC 0
 #  endif
 
 #  if __has_feature(objc_arc_weak)
 #    define _LIBCPP_HAS_OBJC_ARC_WEAK 1
 #  else
 #    define _LIBCPP_HAS_OBJC_ARC_WEAK 0
 #  endif
 
 #  if __has_extension(blocks)
 #    define _LIBCPP_HAS_EXTENSION_BLOCKS 1
 #  else
 #    define _LIBCPP_HAS_EXTENSION_BLOCKS 0
 #  endif
 
 #  if _LIBCPP_HAS_EXTENSION_BLOCKS && defined(__APPLE__)
 #    define _LIBCPP_HAS_BLOCKS_RUNTIME 1
 #  else
 #    define _LIBCPP_HAS_BLOCKS_RUNTIME 0
 #  endif
 
 #  if __has_feature(address_sanitizer)
 #    define _LIBCPP_HAS_ASAN 1
 #  else
 #    define _LIBCPP_HAS_ASAN 0
 #  endif
 
 #  define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__))
 
 #  define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__
 
 #  if defined(_LIBCPP_OBJECT_FORMAT_COFF)
 
 #    ifdef _DLL
 #      define _LIBCPP_CRT_FUNC __declspec(dllimport)
 #    else
 #      define _LIBCPP_CRT_FUNC
 #    endif
 
 #    if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) || (defined(__MINGW32__) && !defined(_LIBCPP_BUILDING_LIBRARY))
 #      define _LIBCPP_DLL_VIS
 #      define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
 #      define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
 #      define _LIBCPP_OVERRIDABLE_FUNC_VIS
 #      define _LIBCPP_EXPORTED_FROM_ABI
 #    elif defined(_LIBCPP_BUILDING_LIBRARY)
 #      define _LIBCPP_DLL_VIS __declspec(dllexport)
 #      if defined(__MINGW32__)
 #        define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS
 #        define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
 #      else
 #        define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
 #        define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS _LIBCPP_DLL_VIS
 #      endif
 #      define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_DLL_VIS
 #      define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllexport)
 #    else
 #      define _LIBCPP_DLL_VIS __declspec(dllimport)
 #      define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS
 #      define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
 #      define _LIBCPP_OVERRIDABLE_FUNC_VIS
 #      define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllimport)
 #    endif
 
 #    define _LIBCPP_HIDDEN
 #    define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
 #    define _LIBCPP_TEMPLATE_VIS
 #    define _LIBCPP_TEMPLATE_DATA_VIS
 #    define _LIBCPP_TYPE_VISIBILITY_DEFAULT
 
 #  else
 
 #    if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
 #      define _LIBCPP_VISIBILITY(vis) __attribute__((__visibility__(vis)))
 #    else
 #      define _LIBCPP_VISIBILITY(vis)
 #    endif
 
 #    define _LIBCPP_HIDDEN _LIBCPP_VISIBILITY("hidden")
 #    define _LIBCPP_TEMPLATE_DATA_VIS _LIBCPP_VISIBILITY("default")
 #    define _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_VISIBILITY("default")
 #    define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_VISIBILITY("default")
 #    define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
 
 // TODO: Make this a proper customization point or remove the option to override it.
 #    ifndef _LIBCPP_OVERRIDABLE_FUNC_VIS
 #      define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_VISIBILITY("default")
 #    endif
 
 #    if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
 // The inline should be removed once PR32114 is resolved
 #      define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS inline _LIBCPP_HIDDEN
 #    else
 #      define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
 #    endif
 
 // GCC doesn't support the type_visibility attribute, so we have to keep the visibility attribute on templates
 #    if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && !__has_attribute(__type_visibility__)
 #      define _LIBCPP_TEMPLATE_VIS __attribute__((__visibility__("default")))
 #    else
 #      define _LIBCPP_TEMPLATE_VIS
 #    endif
 
 #    if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__)
 #      define _LIBCPP_TYPE_VISIBILITY_DEFAULT __attribute__((__type_visibility__("default")))
 #    else
 #      define _LIBCPP_TYPE_VISIBILITY_DEFAULT
 #    endif
 
 #  endif // defined(_LIBCPP_OBJECT_FORMAT_COFF)
 
 #  if __has_attribute(exclude_from_explicit_instantiation)
 #    define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__((__exclude_from_explicit_instantiation__))
 #  else
 // Try to approximate the effect of exclude_from_explicit_instantiation
 // (which is that entities are not assumed to be provided by explicit
 // template instantiations in the dylib) by always inlining those entities.
 #    define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION _LIBCPP_ALWAYS_INLINE
 #  endif
 
 #  ifdef _LIBCPP_COMPILER_CLANG_BASED
 #    define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("clang diagnostic push")
 #    define _LIBCPP_DIAGNOSTIC_POP _Pragma("clang diagnostic pop")
 #    define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(clang diagnostic ignored str))
 #    define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str)
 #  elif defined(_LIBCPP_COMPILER_GCC)
 #    define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("GCC diagnostic push")
 #    define _LIBCPP_DIAGNOSTIC_POP _Pragma("GCC diagnostic pop")
 #    define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str)
 #    define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(GCC diagnostic ignored str))
 #  else
 #    define _LIBCPP_DIAGNOSTIC_PUSH
 #    define _LIBCPP_DIAGNOSTIC_POP
 #    define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str)
 #    define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str)
 #  endif
 
 #  if _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_FAST
 #    define _LIBCPP_HARDENING_SIG f
 #  elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_EXTENSIVE
 #    define _LIBCPP_HARDENING_SIG s
 #  elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_DEBUG
 #    define _LIBCPP_HARDENING_SIG d
 #  else
 #    define _LIBCPP_HARDENING_SIG n // "none"
 #  endif
 
 #  if !_LIBCPP_HAS_EXCEPTIONS
 #    define _LIBCPP_EXCEPTIONS_SIG n
 #  else
 #    define _LIBCPP_EXCEPTIONS_SIG e
 #  endif
 
 #  define _LIBCPP_ODR_SIGNATURE                                                                                        \
     _LIBCPP_CONCAT(_LIBCPP_CONCAT(_LIBCPP_HARDENING_SIG, _LIBCPP_EXCEPTIONS_SIG), _LIBCPP_VERSION)
 
 // This macro marks a symbol as being hidden from libc++'s ABI. This is achieved
 // on two levels:
 // 1. The symbol is given hidden visibility, which ensures that users won't start exporting
 //    symbols from their dynamic library by means of using the libc++ headers. This ensures
 //    that those symbols stay private to the dynamic library in which it is defined.
 //
 // 2. The symbol is given an ABI tag that encodes the ODR-relevant properties of the library.
 //    This ensures that no ODR violation can arise from mixing two TUs compiled with different
 //    versions or configurations of libc++ (such as exceptions vs no-exceptions). Indeed, if the
 //    program contains two definitions of a function, the ODR requires them to be token-by-token
 //    equivalent, and the linker is allowed to pick either definition and discard the other one.
 //
 //    For example, if a program contains a copy of `vector::at()` compiled with exceptions enabled
 //    *and* a copy of `vector::at()` compiled with exceptions disabled (by means of having two TUs
 //    compiled with different settings), the two definitions are both visible by the linker and they
 //    have the same name, but they have a meaningfully different implementation (one throws an exception
 //    and the other aborts the program). This violates the ODR and makes the program ill-formed, and in
 //    practice what will happen is that the linker will pick one of the definitions at random and will
 //    discard the other one. This can quite clearly lead to incorrect program behavior.
 //
 //    A similar reasoning holds for many other properties that are ODR-affecting. Essentially any
 //    property that causes the code of a function to differ from the code in another configuration
 //    can be considered ODR-affecting. In practice, we don't encode all such properties in the ABI
 //    tag, but we encode the ones that we think are most important: library version, exceptions, and
 //    hardening mode.
 //
 //    Note that historically, solving this problem has been achieved in various ways, including
 //    force-inlining all functions or giving internal linkage to all functions. Both these previous
 //    solutions suffer from drawbacks that lead notably to code bloat.
 //
 // Note that we use _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION to ensure that we don't depend
 // on _LIBCPP_HIDE_FROM_ABI methods of classes explicitly instantiated in the dynamic library.
 //
 // Also note that the _LIBCPP_HIDE_FROM_ABI_VIRTUAL macro should be used on virtual functions
 // instead of _LIBCPP_HIDE_FROM_ABI. That macro does not use an ABI tag. Indeed, the mangled
 // name of a virtual function is part of its ABI, since some architectures like arm64e can sign
 // the virtual function pointer in the vtable based on the mangled name of the function. Since
 // we use an ABI tag that changes with each released version, the mangled name of the virtual
 // function would change, which is incorrect. Note that it doesn't make much sense to change
 // the implementation of a virtual function in an ABI-incompatible way in the first place,
 // since that would be an ABI break anyway. Hence, the lack of ABI tag should not be noticeable.
 //
 // The macro can be applied to record and enum types. When the tagged type is nested in
 // a record this "parent" record needs to have the macro too. Another use case for applying
 // this macro to records and unions is to apply an ABI tag to inline constexpr variables.
 // This can be useful for inline variables that are implementation details which are expected
 // to change in the future.
 //
 // TODO: We provide a escape hatch with _LIBCPP_NO_ABI_TAG for folks who want to avoid increasing
 //       the length of symbols with an ABI tag. In practice, we should remove the escape hatch and
 //       use compression mangling instead, see https://github.com/itanium-cxx-abi/cxx-abi/issues/70.
 #  ifndef _LIBCPP_NO_ABI_TAG
 #    define _LIBCPP_HIDE_FROM_ABI                                                                                      \
       _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION                                                       \
       __attribute__((__abi_tag__(_LIBCPP_TOSTRING(_LIBCPP_ODR_SIGNATURE))))
 #  else
 #    define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION
 #  endif
 #  define _LIBCPP_HIDE_FROM_ABI_VIRTUAL _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION
 
 #  ifdef _LIBCPP_BUILDING_LIBRARY
 #    if _LIBCPP_ABI_VERSION > 1
 #      define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI
 #    else
 #      define _LIBCPP_HIDE_FROM_ABI_AFTER_V1
 #    endif
 #  else
 #    define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI
 #  endif
 
 // TODO: Remove this workaround once we drop support for Clang 16
 #  if __has_warning("-Wc++23-extensions")
 #    define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++23-extensions")
 #  else
 #    define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++2b-extensions")
 #  endif
 
 // Clang modules take a significant compile time hit when pushing and popping diagnostics.
 // Since all the headers are marked as system headers in the modulemap, we can simply disable this
 // pushing and popping when building with clang modules.
 #  if !__has_feature(modules)
 #    define _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS                                                                         \
       _LIBCPP_DIAGNOSTIC_PUSH                                                                                          \
       _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++11-extensions")                                                           \
       _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++14-extensions")                                                           \
       _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++17-extensions")                                                           \
       _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++20-extensions")                                                           \
       _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION                                                                 \
       _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++14-extensions")                                                             \
       _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++17-extensions")                                                             \
       _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++20-extensions")                                                             \
       _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++23-extensions")
 #    define _LIBCPP_POP_EXTENSION_DIAGNOSTICS _LIBCPP_DIAGNOSTIC_POP
 #  else
 #    define _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS
 #    define _LIBCPP_POP_EXTENSION_DIAGNOSTICS
 #  endif
 
 // Inline namespaces are available in Clang/GCC/MSVC regardless of C++ dialect.
 // clang-format off
 #  define _LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS                                               \
                                       namespace _LIBCPP_TYPE_VISIBILITY_DEFAULT std {                                  \
                                inline namespace _LIBCPP_ABI_NAMESPACE {
 #  define _LIBCPP_END_NAMESPACE_STD }} _LIBCPP_POP_EXTENSION_DIAGNOSTICS
 
 #define _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL namespace std { namespace experimental {
 #define _LIBCPP_END_NAMESPACE_EXPERIMENTAL }}
 
 #define _LIBCPP_BEGIN_NAMESPACE_LFTS _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL inline namespace fundamentals_v1 {
 #define _LIBCPP_END_NAMESPACE_LFTS } _LIBCPP_END_NAMESPACE_EXPERIMENTAL
 
 #define _LIBCPP_BEGIN_NAMESPACE_LFTS_V2 _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL inline namespace fundamentals_v2 {
 #define _LIBCPP_END_NAMESPACE_LFTS_V2 } _LIBCPP_END_NAMESPACE_EXPERIMENTAL
 
 #ifdef _LIBCPP_ABI_NO_FILESYSTEM_INLINE_NAMESPACE
 #  define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD namespace filesystem {
 #  define _LIBCPP_END_NAMESPACE_FILESYSTEM } _LIBCPP_END_NAMESPACE_STD
 #else
 #  define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD                                               \
                                              inline namespace __fs { namespace filesystem {
 
 #  define _LIBCPP_END_NAMESPACE_FILESYSTEM }} _LIBCPP_END_NAMESPACE_STD
 #endif
 
 // clang-format on
 
 #  if __has_attribute(__enable_if__)
 #    define _LIBCPP_PREFERRED_OVERLOAD __attribute__((__enable_if__(true, "")))
 #  endif
 
 #  if !defined(__SIZEOF_INT128__) || defined(_MSC_VER)
 #    define _LIBCPP_HAS_INT128 0
 #  else
 #    define _LIBCPP_HAS_INT128 1
 #  endif
 
 #  ifdef _LIBCPP_CXX03_LANG
 #    define _LIBCPP_DECLARE_STRONG_ENUM(x)                                                                             \
       struct _LIBCPP_EXPORTED_FROM_ABI x {                                                                             \
         enum __lx
 // clang-format off
 #    define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x)                                                                      \
       __lx __v_;                                                                                                       \
       _LIBCPP_HIDE_FROM_ABI x(__lx __v) : __v_(__v) {}                                                                 \
       _LIBCPP_HIDE_FROM_ABI explicit x(int __v) : __v_(static_cast<__lx>(__v)) {}                                      \
       _LIBCPP_HIDE_FROM_ABI operator int() const { return __v_; }                                                      \
       };
 // clang-format on
 
 #  else // _LIBCPP_CXX03_LANG
 #    define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class x
 #    define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x)
 #  endif // _LIBCPP_CXX03_LANG
 
 #  ifdef __FreeBSD__
 #    define _DECLARE_C99_LDBL_MATH 1
 #  endif
 
 // If we are getting operator new from the MSVC CRT, then allocation overloads
 // for align_val_t were added in 19.12, aka VS 2017 version 15.3.
 #  if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912
 #    define _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION 0
 #  elif defined(_LIBCPP_ABI_VCRUNTIME) && !defined(__cpp_aligned_new)
 // We're deferring to Microsoft's STL to provide aligned new et al. We don't
 // have it unless the language feature test macro is defined.
 #    define _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION 0
 #  elif defined(__MVS__)
 #    define _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION 0
 #  else
 #    define _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION 1
 #  endif
 
 #  if !_LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION || (!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606)
 #    define _LIBCPP_HAS_ALIGNED_ALLOCATION 0
 #  else
 #    define _LIBCPP_HAS_ALIGNED_ALLOCATION 1
 #  endif
 
 // It is not yet possible to use aligned_alloc() on all Apple platforms since
 // 10.15 was the first version to ship an implementation of aligned_alloc().
 #  if defined(__APPLE__)
 #    if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) &&                                                     \
          __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101500) ||                                                    \
         (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) &&                                                    \
          __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 130000)
 #      define _LIBCPP_HAS_C11_ALIGNED_ALLOC 0
 #    else
 #      define _LIBCPP_HAS_C11_ALIGNED_ALLOC 1
 #    endif
 #  elif defined(__ANDROID__) && __ANDROID_API__ < 28
 // Android only provides aligned_alloc when targeting API 28 or higher.
 #    define _LIBCPP_HAS_C11_ALIGNED_ALLOC 0
 #  else
 #    define _LIBCPP_HAS_C11_ALIGNED_ALLOC 1
 #  endif
 
 #  if defined(__APPLE__) || defined(__FreeBSD__)
 #    define _LIBCPP_HAS_DEFAULTRUNELOCALE
 #  endif
 
 #  if defined(__APPLE__) || defined(__FreeBSD__)
 #    define _LIBCPP_WCTYPE_IS_MASK
 #  endif
 
 #  if _LIBCPP_STD_VER <= 17 || !defined(__cpp_char8_t)
 #    define _LIBCPP_HAS_CHAR8_T 0
 #  else
 #    define _LIBCPP_HAS_CHAR8_T 1
 #  endif
 
 // Deprecation macros.
 //
 // Deprecations warnings are always enabled, except when users explicitly opt-out
 // by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS.
 #  if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)
 #    if __has_attribute(__deprecated__)
 #      define _LIBCPP_DEPRECATED __attribute__((__deprecated__))
 #      define _LIBCPP_DEPRECATED_(m) __attribute__((__deprecated__(m)))
 #    elif _LIBCPP_STD_VER >= 14
 #      define _LIBCPP_DEPRECATED [[deprecated]]
 #      define _LIBCPP_DEPRECATED_(m) [[deprecated(m)]]
 #    else
 #      define _LIBCPP_DEPRECATED
 #      define _LIBCPP_DEPRECATED_(m)
 #    endif
 #  else
 #    define _LIBCPP_DEPRECATED
 #    define _LIBCPP_DEPRECATED_(m)
 #  endif
 
 #  if !defined(_LIBCPP_CXX03_LANG)
 #    define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED
 #  else
 #    define _LIBCPP_DEPRECATED_IN_CXX11
 #  endif
 
 #  if _LIBCPP_STD_VER >= 14
 #    define _LIBCPP_DEPRECATED_IN_CXX14 _LIBCPP_DEPRECATED
 #  else
 #    define _LIBCPP_DEPRECATED_IN_CXX14
 #  endif
 
 #  if _LIBCPP_STD_VER >= 17
 #    define _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_DEPRECATED
 #  else
 #    define _LIBCPP_DEPRECATED_IN_CXX17
 #  endif
 
 #  if _LIBCPP_STD_VER >= 20
 #    define _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_DEPRECATED
 #  else
 #    define _LIBCPP_DEPRECATED_IN_CXX20
 #  endif
 
 #  if _LIBCPP_STD_VER >= 23
 #    define _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_DEPRECATED
 #  else
 #    define _LIBCPP_DEPRECATED_IN_CXX23
 #  endif
 
 #  if _LIBCPP_STD_VER >= 26
 #    define _LIBCPP_DEPRECATED_IN_CXX26 _LIBCPP_DEPRECATED
 #  else
 #    define _LIBCPP_DEPRECATED_IN_CXX26
 #  endif
 
 #  if _LIBCPP_HAS_CHAR8_T
 #    define _LIBCPP_DEPRECATED_WITH_CHAR8_T _LIBCPP_DEPRECATED
 #  else
 #    define _LIBCPP_DEPRECATED_WITH_CHAR8_T
 #  endif
 
 // Macros to enter and leave a state where deprecation warnings are suppressed.
 #  if defined(_LIBCPP_COMPILER_CLANG_BASED) || defined(_LIBCPP_COMPILER_GCC)
 #    define _LIBCPP_SUPPRESS_DEPRECATED_PUSH                                                                           \
       _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wdeprecated\"")                                \
           _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
 #    define _LIBCPP_SUPPRESS_DEPRECATED_POP _Pragma("GCC diagnostic pop")
 #  else
 #    define _LIBCPP_SUPPRESS_DEPRECATED_PUSH
 #    define _LIBCPP_SUPPRESS_DEPRECATED_POP
 #  endif
 
 #  if _LIBCPP_STD_VER <= 11
 #    define _LIBCPP_EXPLICIT_SINCE_CXX14
 #  else
 #    define _LIBCPP_EXPLICIT_SINCE_CXX14 explicit
 #  endif
 
 #  if _LIBCPP_STD_VER >= 23
 #    define _LIBCPP_EXPLICIT_SINCE_CXX23 explicit
 #  else
 #    define _LIBCPP_EXPLICIT_SINCE_CXX23
 #  endif
 
 #  if _LIBCPP_STD_VER >= 14
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX14 constexpr
 #  else
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX14
 #  endif
 
 #  if _LIBCPP_STD_VER >= 17
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX17 constexpr
 #  else
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX17
 #  endif
 
 #  if _LIBCPP_STD_VER >= 20
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX20 constexpr
 #  else
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX20
 #  endif
 
 #  if _LIBCPP_STD_VER >= 23
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX23 constexpr
 #  else
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX23
 #  endif
 
 #  if _LIBCPP_STD_VER >= 26
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX26 constexpr
 #  else
 #    define _LIBCPP_CONSTEXPR_SINCE_CXX26
 #  endif
 
 #  ifndef _LIBCPP_WEAK
 #    define _LIBCPP_WEAK __attribute__((__weak__))
 #  endif
 
 // Thread API
 // clang-format off
 #  if _LIBCPP_HAS_THREADS &&                                                                                           \
       !_LIBCPP_HAS_THREAD_API_PTHREAD &&                                                                               \
       !_LIBCPP_HAS_THREAD_API_WIN32 &&                                                                                 \
       !_LIBCPP_HAS_THREAD_API_EXTERNAL
 
 #    if defined(__FreeBSD__) ||                                                                                        \
         defined(__wasi__) ||                                                                                           \
         defined(__NetBSD__) ||                                                                                         \
         defined(__OpenBSD__) ||                                                                                        \
         defined(__NuttX__) ||                                                                                          \
         defined(__linux__) ||                                                                                          \
         defined(__GNU__) ||                                                                                            \
         defined(__APPLE__) ||                                                                                          \
         defined(__MVS__) ||                                                                                            \
         defined(_AIX) ||                                                                                               \
         defined(__EMSCRIPTEN__)
 // clang-format on
 #      undef _LIBCPP_HAS_THREAD_API_PTHREAD
 #      define _LIBCPP_HAS_THREAD_API_PTHREAD 1
 #    elif defined(__Fuchsia__)
 // TODO(44575): Switch to C11 thread API when possible.
 #      undef _LIBCPP_HAS_THREAD_API_PTHREAD
 #      define _LIBCPP_HAS_THREAD_API_PTHREAD 1
 #    elif defined(_LIBCPP_WIN32API)
 #      undef _LIBCPP_HAS_THREAD_API_WIN32
 #      define _LIBCPP_HAS_THREAD_API_WIN32 1
 #    else
 #      error "No thread API"
 #    endif // _LIBCPP_HAS_THREAD_API
 #  endif   // _LIBCPP_HAS_THREADS
 
 #  if _LIBCPP_HAS_THREAD_API_PTHREAD
 #    if defined(__ANDROID__) && __ANDROID_API__ >= 30
 #      define _LIBCPP_HAS_COND_CLOCKWAIT 1
 #    elif defined(_LIBCPP_GLIBC_PREREQ)
 #      if _LIBCPP_GLIBC_PREREQ(2, 30)
 #        define _LIBCPP_HAS_COND_CLOCKWAIT 1
 #      else
 #        define _LIBCPP_HAS_COND_CLOCKWAIT 0
 #      endif
 #    else
 #      define _LIBCPP_HAS_COND_CLOCKWAIT 0
 #    endif
 #  else
 #    define _LIBCPP_HAS_COND_CLOCKWAIT 0
 #  endif
 
 #  if !_LIBCPP_HAS_THREADS && _LIBCPP_HAS_THREAD_API_PTHREAD
 #    error _LIBCPP_HAS_THREAD_API_PTHREAD may only be true when _LIBCPP_HAS_THREADS is true.
 #  endif
 
 #  if !_LIBCPP_HAS_THREADS && _LIBCPP_HAS_THREAD_API_EXTERNAL
 #    error _LIBCPP_HAS_THREAD_API_EXTERNAL may only be true when _LIBCPP_HAS_THREADS is true.
 #  endif
 
 #  if !_LIBCPP_HAS_MONOTONIC_CLOCK && _LIBCPP_HAS_THREADS
 #    error _LIBCPP_HAS_MONOTONIC_CLOCK may only be false when _LIBCPP_HAS_THREADS is false.
 #  endif
 
 #  if _LIBCPP_HAS_THREADS && !defined(__STDCPP_THREADS__)
 #    define __STDCPP_THREADS__ 1
 #  endif
 
 // The glibc and Bionic implementation of pthreads implements
 // pthread_mutex_destroy as nop for regular mutexes. Additionally, Win32
 // mutexes have no destroy mechanism.
 //
 // This optimization can't be performed on Apple platforms, where
 // pthread_mutex_destroy can allow the kernel to release resources.
 // See https://llvm.org/D64298 for details.
 //
 // TODO(EricWF): Enable this optimization on Bionic after speaking to their
 //               respective stakeholders.
 // clang-format off
 #  if (_LIBCPP_HAS_THREAD_API_PTHREAD && defined(__GLIBC__)) ||                                                        \
       (_LIBCPP_HAS_THREAD_API_C11 && defined(__Fuchsia__)) ||                                                          \
        _LIBCPP_HAS_THREAD_API_WIN32
 // clang-format on
 #    define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION 1
 #  else
 #    define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION 0
 #  endif
 
 // Destroying a condvar is a nop on Windows.
 //
 // This optimization can't be performed on Apple platforms, where
 // pthread_cond_destroy can allow the kernel to release resources.
 // See https://llvm.org/D64298 for details.
 //
 // TODO(EricWF): This is potentially true for some pthread implementations
 // as well.
 #  if (_LIBCPP_HAS_THREAD_API_C11 && defined(__Fuchsia__)) || _LIBCPP_HAS_THREAD_API_WIN32
 #    define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION 1
 #  else
 #    define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION 0
 #  endif
 
 #  if defined(__BIONIC__) || defined(__NuttX__) || defined(__Fuchsia__) || defined(__wasi__) ||                        \
       _LIBCPP_HAS_MUSL_LIBC || defined(__OpenBSD__) || defined(__LLVM_LIBC__)
 #    define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE
 #  endif
 
 #  if __has_feature(cxx_atomic) || __has_extension(c_atomic) || __has_keyword(_Atomic)
 #    define _LIBCPP_HAS_C_ATOMIC_IMP 1
 #    define _LIBCPP_HAS_GCC_ATOMIC_IMP 0
 #    define _LIBCPP_HAS_EXTERNAL_ATOMIC_IMP 0
 #  elif defined(_LIBCPP_COMPILER_GCC)
 #    define _LIBCPP_HAS_C_ATOMIC_IMP 0
 #    define _LIBCPP_HAS_GCC_ATOMIC_IMP 1
 #    define _LIBCPP_HAS_EXTERNAL_ATOMIC_IMP 0
 #  endif
 
 #  if !_LIBCPP_HAS_C_ATOMIC_IMP && !_LIBCPP_HAS_GCC_ATOMIC_IMP && !_LIBCPP_HAS_EXTERNAL_ATOMIC_IMP
 #    define _LIBCPP_HAS_ATOMIC_HEADER 0
 #  else
 #    define _LIBCPP_HAS_ATOMIC_HEADER 1
 #    ifndef _LIBCPP_ATOMIC_FLAG_TYPE
 #      define _LIBCPP_ATOMIC_FLAG_TYPE bool
 #    endif
 #  endif
 
 #  if defined(__FreeBSD__) && defined(__clang__) && __has_attribute(__no_thread_safety_analysis__)
 #    define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS __attribute__((__no_thread_safety_analysis__))
 #  else
 #    define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
 #  endif
 
 // Work around the attribute handling in clang.  When both __declspec and
 // __attribute__ are present, the processing goes awry preventing the definition
 // of the types. In MinGW mode, __declspec evaluates to __attribute__, and thus
 // combining the two does work.
 #  if defined(_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS) && defined(__clang__) &&                                       \
       __has_attribute(acquire_capability) && !defined(_MSC_VER)
 #    define _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 1
 #  else
 #    define _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 0
 #  endif
 
 #  if _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS
 #    define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) __attribute__((x))
 #  else
 #    define _LIBCPP_THREAD_SAFETY_ANNOTATION(x)
 #  endif
 
 #  if _LIBCPP_STD_VER >= 20
 #    define _LIBCPP_CONSTINIT constinit
 #  elif __has_attribute(__require_constant_initialization__)
 #    define _LIBCPP_CONSTINIT __attribute__((__require_constant_initialization__))
 #  else
 #    define _LIBCPP_CONSTINIT
 #  endif
 
 #  if defined(__CUDACC__) || defined(__CUDA_ARCH__) || defined(__CUDA_LIBDEVICE__)
 // The CUDA SDK contains an unfortunate definition for the __noinline__ macro,
 // which breaks the regular __attribute__((__noinline__)) syntax. Therefore,
 // when compiling for CUDA we use the non-underscored version of the noinline
 // attribute.
 //
 // This is a temporary workaround and we still expect the CUDA SDK team to solve
 // this issue properly in the SDK headers.
 //
 // See https://github.com/llvm/llvm-project/pull/73838 for more details.
 #    define _LIBCPP_NOINLINE __attribute__((noinline))
 #  elif __has_attribute(__noinline__)
 #    define _LIBCPP_NOINLINE __attribute__((__noinline__))
 #  else
 #    define _LIBCPP_NOINLINE
 #  endif
 
 // We often repeat things just for handling wide characters in the library.
 // When wide characters are disabled, it can be useful to have a quick way of
 // disabling it without having to resort to #if-#endif, which has a larger
 // impact on readability.
 #  if !_LIBCPP_HAS_WIDE_CHARACTERS
 #    define _LIBCPP_IF_WIDE_CHARACTERS(...)
 #  else
 #    define _LIBCPP_IF_WIDE_CHARACTERS(...) __VA_ARGS__
 #  endif
 
 // clang-format off
 #  define _LIBCPP_PUSH_MACROS _Pragma("push_macro(\"min\")") _Pragma("push_macro(\"max\")") _Pragma("push_macro(\"refresh\")") _Pragma("push_macro(\"move\")") _Pragma("push_macro(\"erase\")")
 #  define _LIBCPP_POP_MACROS _Pragma("pop_macro(\"min\")") _Pragma("pop_macro(\"max\")") _Pragma("pop_macro(\"refresh\")") _Pragma("pop_macro(\"move\")") _Pragma("pop_macro(\"erase\")")
 // clang-format on
 
 #  ifndef _LIBCPP_NO_AUTO_LINK
 #    if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)
 #      if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
 #        pragma comment(lib, "c++.lib")
 #      else
 #        pragma comment(lib, "libc++.lib")
 #      endif
 #    endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)
 #  endif   // _LIBCPP_NO_AUTO_LINK
 
 // Configures the fopen close-on-exec mode character, if any. This string will
 // be appended to any mode string used by fstream for fopen/fdopen.
 //
 // Not all platforms support this, but it helps avoid fd-leaks on platforms that
 // do.
 #  if defined(__BIONIC__)
 #    define _LIBCPP_FOPEN_CLOEXEC_MODE "e"
 #  else
 #    define _LIBCPP_FOPEN_CLOEXEC_MODE
 #  endif
 
 #  if __has_cpp_attribute(msvc::no_unique_address)
 // MSVC implements [[no_unique_address]] as a silent no-op currently.
 // (If/when MSVC breaks its C++ ABI, it will be changed to work as intended.)
 // However, MSVC implements [[msvc::no_unique_address]] which does what
 // [[no_unique_address]] is supposed to do, in general.
 #    define _LIBCPP_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]]
 #  else
 #    define _LIBCPP_NO_UNIQUE_ADDRESS [[__no_unique_address__]]
 #  endif
 
 // c8rtomb() and mbrtoc8() were added in C++20 and C23. Support for these
 // functions is gradually being added to existing C libraries. The conditions
 // below check for known C library versions and conditions under which these
 // functions are declared by the C library.
 //
 // GNU libc 2.36 and newer declare c8rtomb() and mbrtoc8() in C++ modes if
 // __cpp_char8_t is defined or if C2X extensions are enabled. Determining
 // the latter depends on internal GNU libc details that are not appropriate
 // to depend on here, so any declarations present when __cpp_char8_t is not
 // defined are ignored.
 #  if defined(_LIBCPP_GLIBC_PREREQ)
 #    if _LIBCPP_GLIBC_PREREQ(2, 36) && defined(__cpp_char8_t)
 #      define _LIBCPP_HAS_C8RTOMB_MBRTOC8 1
 #    else
 #      define _LIBCPP_HAS_C8RTOMB_MBRTOC8 0
 #    endif
 #  else
 #    define _LIBCPP_HAS_C8RTOMB_MBRTOC8 0
 #  endif
 
 // There are a handful of public standard library types that are intended to
 // support CTAD but don't need any explicit deduction guides to do so. This
 // macro is used to mark them as such, which suppresses the
 // '-Wctad-maybe-unsupported' compiler warning when CTAD is used in user code
 // with these classes.
 #  if _LIBCPP_STD_VER >= 17
 #    ifdef _LIBCPP_COMPILER_CLANG_BASED
 #      define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName)                                                              \
         template <class... _Tag>                                                                                       \
         [[maybe_unused]] _ClassName(typename _Tag::__allow_ctad...)->_ClassName<_Tag...>
 #    else
 #      define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(ClassName)                                                               \
         template <class... _Tag>                                                                                       \
         ClassName(typename _Tag::__allow_ctad...)->ClassName<_Tag...>
 #    endif
 #  else
 #    define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) static_assert(true, "")
 #  endif
 
 // TODO(varconst): currently, there are bugs in Clang's intrinsics when handling Objective-C++ `id`, so don't use
 // compiler intrinsics in the Objective-C++ mode.
 #  ifdef __OBJC__
 #    define _LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS
 #  endif
 
 #  define _PSTL_PRAGMA(x) _Pragma(#x)
 
 // Enable SIMD for compilers that support OpenMP 4.0
 #  if (defined(_OPENMP) && _OPENMP >= 201307)
 
 #    define _PSTL_UDR_PRESENT
 #    define _PSTL_PRAGMA_SIMD _PSTL_PRAGMA(omp simd)
 #    define _PSTL_PRAGMA_DECLARE_SIMD _PSTL_PRAGMA(omp declare simd)
 #    define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _PSTL_PRAGMA(omp simd reduction(PRM))
 #    define _PSTL_PRAGMA_SIMD_SCAN(PRM) _PSTL_PRAGMA(omp simd reduction(inscan, PRM))
 #    define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan inclusive(PRM))
 #    define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan exclusive(PRM))
 
 // Declaration of reduction functor, where
 // NAME - the name of the functor
 // OP - type of the callable object with the reduction operation
 // omp_in - refers to the local partial result
 // omp_out - refers to the final value of the combiner operator
 // omp_priv - refers to the private copy of the initial value
 // omp_orig - refers to the original variable to be reduced
 #    define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)                                                                   \
       _PSTL_PRAGMA(omp declare reduction(NAME:OP : omp_out(omp_in)) initializer(omp_priv = omp_orig))
 
 #  elif defined(_LIBCPP_COMPILER_CLANG_BASED)
 
 #    define _PSTL_PRAGMA_SIMD _Pragma("clang loop vectorize(enable) interleave(enable)")
 #    define _PSTL_PRAGMA_DECLARE_SIMD
 #    define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)")
 #    define _PSTL_PRAGMA_SIMD_SCAN(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)")
 #    define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM)
 #    define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM)
 #    define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)
 
 #  else // (defined(_OPENMP) && _OPENMP >= 201307)
 
 #    define _PSTL_PRAGMA_SIMD
 #    define _PSTL_PRAGMA_DECLARE_SIMD
 #    define _PSTL_PRAGMA_SIMD_REDUCTION(PRM)
 #    define _PSTL_PRAGMA_SIMD_SCAN(PRM)
 #    define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM)
 #    define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM)
 #    define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)
 
 #  endif // (defined(_OPENMP) && _OPENMP >= 201307)
 
 #  define _PSTL_USE_NONTEMPORAL_STORES_IF_ALLOWED
 
 // Optional attributes - these are useful for a better QoI, but not required to be available
 
 #  if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC)
 #    define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi")))
 #  else
 #    define _LIBCPP_NO_CFI
 #  endif
 
 #  if __has_attribute(__malloc__)
 #    define _LIBCPP_NOALIAS __attribute__((__malloc__))
 #  else
 #    define _LIBCPP_NOALIAS
 #  endif
 
 #  if __has_attribute(__using_if_exists__)
 #    define _LIBCPP_USING_IF_EXISTS __attribute__((__using_if_exists__))
 #  else
 #    define _LIBCPP_USING_IF_EXISTS
 #  endif
 
 #  if __has_attribute(__no_destroy__)
 #    define _LIBCPP_NO_DESTROY __attribute__((__no_destroy__))
 #  else
 #    define _LIBCPP_NO_DESTROY
 #  endif
 
 #  if __has_attribute(__diagnose_if__)
 #    define _LIBCPP_DIAGNOSE_WARNING(...) __attribute__((__diagnose_if__(__VA_ARGS__, "warning")))
 #  else
 #    define _LIBCPP_DIAGNOSE_WARNING(...)
 #  endif
 
 // Use a function like macro to imply that it must be followed by a semicolon
 #  if __has_cpp_attribute(fallthrough)
 #    define _LIBCPP_FALLTHROUGH() [[fallthrough]]
 #  elif __has_attribute(__fallthrough__)
 #    define _LIBCPP_FALLTHROUGH() __attribute__((__fallthrough__))
 #  else
 #    define _LIBCPP_FALLTHROUGH() ((void)0)
 #  endif
 
 #  if __has_cpp_attribute(_Clang::__lifetimebound__)
 #    define _LIBCPP_LIFETIMEBOUND [[_Clang::__lifetimebound__]]
 #  else
 #    define _LIBCPP_LIFETIMEBOUND
 #  endif
 
 #  if __has_cpp_attribute(_Clang::__noescape__)
 #    define _LIBCPP_NOESCAPE [[_Clang::__noescape__]]
 #  else
 #    define _LIBCPP_NOESCAPE
 #  endif
 
 #  define _LIBCPP_NODEBUG [[__gnu__::__nodebug__]]
 
 #  if __has_cpp_attribute(_Clang::__no_specializations__)
 #    define _LIBCPP_NO_SPECIALIZATIONS                                                                                 \
       [[_Clang::__no_specializations__("Users are not allowed to specialize this standard library entity")]]
 #  else
 #    define _LIBCPP_NO_SPECIALIZATIONS
 #  endif
 
 #  if __has_attribute(__standalone_debug__)
 #    define _LIBCPP_STANDALONE_DEBUG __attribute__((__standalone_debug__))
 #  else
 #    define _LIBCPP_STANDALONE_DEBUG
 #  endif
 
 #  if __has_attribute(__preferred_name__)
 #    define _LIBCPP_PREFERRED_NAME(x) __attribute__((__preferred_name__(x)))
 #  else
 #    define _LIBCPP_PREFERRED_NAME(x)
 #  endif
 
 #  if __has_attribute(__no_sanitize__)
 #    define _LIBCPP_NO_SANITIZE(...) __attribute__((__no_sanitize__(__VA_ARGS__)))
 #  else
 #    define _LIBCPP_NO_SANITIZE(...)
 #  endif
 
 #  if __has_attribute(__init_priority__)
 #    define _LIBCPP_INIT_PRIORITY_MAX __attribute__((__init_priority__(100)))
 #  else
 #    define _LIBCPP_INIT_PRIORITY_MAX
 #  endif
 
 #  if __has_attribute(__format__)
 // The attribute uses 1-based indices for ordinary and static member functions.
 // The attribute uses 2-based indices for non-static member functions.
 #    define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index)                           \
       __attribute__((__format__(archetype, format_string_index, first_format_arg_index)))
 #  else
 #    define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) /* nothing */
 #  endif
 
 #  if __has_attribute(__packed__)
 #    define _LIBCPP_PACKED __attribute__((__packed__))
 #  else
 #    define _LIBCPP_PACKED
 #  endif
 
 #  if defined(_LIBCPP_ABI_MICROSOFT) && __has_declspec_attribute(empty_bases)
 #    define _LIBCPP_DECLSPEC_EMPTY_BASES __declspec(empty_bases)
 #  else
 #    define _LIBCPP_DECLSPEC_EMPTY_BASES
 #  endif
 
 // Allow for build-time disabling of unsigned integer sanitization
 #  if __has_attribute(no_sanitize) && !defined(_LIBCPP_COMPILER_GCC)
 #    define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow")))
 #  else
 #    define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
 #  endif
 
 // Clang-18 has support for deducing this, but it does not set the FTM.
 #  if defined(__cpp_explicit_this_parameter) || (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 1800)
 #    define _LIBCPP_HAS_EXPLICIT_THIS_PARAMETER 1
 #  else
 #    define _LIBCPP_HAS_EXPLICIT_THIS_PARAMETER 0
 #  endif
 
 #endif // __cplusplus
 
 #endif // _LIBCPP___CONFIG

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