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__config
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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>
#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
# pragma GCC system_header
#endif
#if defined(__apple_build_version__)
// Given AppleClang XX.Y.Z, _LIBCPP_APPLE_CLANG_VER is XXYZ (e.g. AppleClang 14.0.3 => 1403)
# define _LIBCPP_COMPILER_CLANG_BASED
# define _LIBCPP_APPLE_CLANG_VER (__apple_build_version__ / 10000)
#elif defined(__clang__)
# define _LIBCPP_COMPILER_CLANG_BASED
# define _LIBCPP_CLANG_VER (__clang_major__ * 100 + __clang_minor__)
#elif defined(__GNUC__)
# define _LIBCPP_COMPILER_GCC
#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 180000
# define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y
# define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y)
// Valid C++ identifier that revs with every libc++ version. This can be used to
// generate identifiers that must be unique for every released libc++ version.
# define _LIBCPP_VERSIONED_IDENTIFIER _LIBCPP_CONCAT(v, _LIBCPP_VERSION)
# if __STDC_HOSTED__ == 0
# define _LIBCPP_FREESTANDING
# endif
// NOLINTBEGIN(libcpp-cpp-version-check)
# ifndef _LIBCPP_STD_VER
# if __cplusplus <= 201103L
# define _LIBCPP_STD_VER 11
# elif __cplusplus <= 201402L
# define _LIBCPP_STD_VER 14
# elif __cplusplus <= 201703L
# define _LIBCPP_STD_VER 17
# elif __cplusplus <= 202002L
# define _LIBCPP_STD_VER 20
# elif __cplusplus <= 202302L
# define _LIBCPP_STD_VER 23
# else
// Expected release year of the next C++ standard
# define _LIBCPP_STD_VER 26
# endif
# endif // _LIBCPP_STD_VER
// NOLINTEND(libcpp-cpp-version-check)
# if defined(__ELF__)
# define _LIBCPP_OBJECT_FORMAT_ELF 1
# elif defined(__MACH__)
# define _LIBCPP_OBJECT_FORMAT_MACHO 1
# elif defined(_WIN32)
# define _LIBCPP_OBJECT_FORMAT_COFF 1
# elif defined(__wasm__)
# define _LIBCPP_OBJECT_FORMAT_WASM 1
# elif defined(_AIX)
# define _LIBCPP_OBJECT_FORMAT_XCOFF 1
# else
// ... add new file formats here ...
# endif
// ABI {
# if _LIBCPP_ABI_VERSION >= 2
// Change short string representation so that string data starts at offset 0,
// improving its alignment in some cases.
# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
// Fix deque iterator type in order to support incomplete types.
# define _LIBCPP_ABI_INCOMPLETE_TYPES_IN_DEQUE
// Fix undefined behavior in how std::list stores its linked nodes.
# define _LIBCPP_ABI_LIST_REMOVE_NODE_POINTER_UB
// Fix undefined behavior in how __tree stores its end and parent nodes.
# define _LIBCPP_ABI_TREE_REMOVE_NODE_POINTER_UB
// Fix undefined behavior in how __hash_table stores its pointer types.
# define _LIBCPP_ABI_FIX_UNORDERED_NODE_POINTER_UB
# define _LIBCPP_ABI_FORWARD_LIST_REMOVE_NODE_POINTER_UB
# define _LIBCPP_ABI_FIX_UNORDERED_CONTAINER_SIZE_TYPE
// Define a key function for `bad_function_call` in the library, to centralize
// its vtable and typeinfo to libc++ rather than having all other libraries
// using that class define their own copies.
# define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION
// Override the default return value of exception::what() for
// bad_function_call::what() with a string that is specific to
// bad_function_call (see http://wg21.link/LWG2233). This is an ABI break
// because it changes the vtable layout of bad_function_call.
# define _LIBCPP_ABI_BAD_FUNCTION_CALL_GOOD_WHAT_MESSAGE
// Enable optimized version of __do_get_(un)signed which avoids redundant copies.
# define _LIBCPP_ABI_OPTIMIZED_LOCALE_NUM_GET
// Give reverse_iterator<T> one data member of type T, not two.
// Also, in C++17 and later, don't derive iterator types from std::iterator.
# define _LIBCPP_ABI_NO_ITERATOR_BASES
// Use the smallest possible integer type to represent the index of the variant.
// Previously libc++ used "unsigned int" exclusively.
# define _LIBCPP_ABI_VARIANT_INDEX_TYPE_OPTIMIZATION
// Unstable attempt to provide a more optimized std::function
# define _LIBCPP_ABI_OPTIMIZED_FUNCTION
// All the regex constants must be distinct and nonzero.
# define _LIBCPP_ABI_REGEX_CONSTANTS_NONZERO
// Re-worked external template instantiations for std::string with a focus on
// performance and fast-path inlining.
# define _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION
// Enable clang::trivial_abi on std::unique_ptr.
# define _LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI
// Enable clang::trivial_abi on std::shared_ptr and std::weak_ptr
# define _LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI
// std::random_device holds some state when it uses an implementation that gets
// entropy from a file (see _LIBCPP_USING_DEV_RANDOM). When switching from this
// implementation to another one on a platform that has already shipped
// std::random_device, one needs to retain the same object layout to remain ABI
// compatible. This switch removes these workarounds for platforms that don't care
// about ABI compatibility.
# define _LIBCPP_ABI_NO_RANDOM_DEVICE_COMPATIBILITY_LAYOUT
// Don't export the legacy __basic_string_common class and its methods from the built library.
# define _LIBCPP_ABI_DO_NOT_EXPORT_BASIC_STRING_COMMON
// Don't export the legacy __vector_base_common class and its methods from the built library.
# define _LIBCPP_ABI_DO_NOT_EXPORT_VECTOR_BASE_COMMON
// According to the Standard, `bitset::operator[] const` returns bool
# define _LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL
// Fix the implementation of CityHash used for std::hash<fundamental-type>.
// This is an ABI break because `std::hash` will return a different result,
// which means that hashing the same object in translation units built against
// different versions of libc++ can return inconsistent results. This is especially
// tricky since std::hash is used in the implementation of unordered containers.
//
// The incorrect implementation of CityHash has the problem that it drops some
// bits on the floor.
# define _LIBCPP_ABI_FIX_CITYHASH_IMPLEMENTATION
// Remove the base 10 implementation of std::to_chars from the dylib.
// The implementation moved to the header, but we still export the symbols from
// the dylib for backwards compatibility.
# define _LIBCPP_ABI_DO_NOT_EXPORT_TO_CHARS_BASE_10
# elif _LIBCPP_ABI_VERSION == 1
# if !(defined(_LIBCPP_OBJECT_FORMAT_COFF) || defined(_LIBCPP_OBJECT_FORMAT_XCOFF))
// Enable compiling copies of now inline methods into the dylib to support
// applications compiled against older libraries. This is unnecessary with
// COFF dllexport semantics, since dllexport forces a non-inline definition
// of inline functions to be emitted anyway. Our own non-inline copy would
// conflict with the dllexport-emitted copy, so we disable it. For XCOFF,
// the linker will take issue with the symbols in the shared object if the
// weak inline methods get visibility (such as from -fvisibility-inlines-hidden),
// so disable it.
# define _LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS
# endif
// Feature macros for disabling pre ABI v1 features. All of these options
// are deprecated.
# if defined(__FreeBSD__) && __FreeBSD__ < 14
# define _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR
# endif
// For XCOFF linkers, we have problems if we see a weak hidden version of a symbol
// in user code (like you get with -fvisibility-inlines-hidden) and then a strong def
// in the library, so we need to always rely on the library version.
# if defined(_AIX)
# define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION
# endif
# endif
# if defined(_LIBCPP_BUILDING_LIBRARY) || _LIBCPP_ABI_VERSION >= 2
// Enable additional explicit instantiations of iostreams components. This
// reduces the number of weak definitions generated in programs that use
// iostreams by providing a single strong definition in the shared library.
# define _LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1
// Define a key function for `bad_function_call` in the library, to centralize
// its vtable and typeinfo to libc++ rather than having all other libraries
// using that class define their own copies.
# define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION
# endif
// Changes the iterator type of select containers (see below) to a bounded iterator that keeps track of whether it's
// within the bounds of the original container and asserts it on every dereference.
//
// ABI impact: changes the iterator type of the relevant containers.
//
// Supported containers:
// - `span`;
// - `string_view`;
// - `array`.
// #define _LIBCPP_ABI_BOUNDED_ITERATORS
// } ABI
// HARDENING {
// TODO(hardening): remove this in LLVM 19.
// This is for backward compatibility -- make enabling `_LIBCPP_ENABLE_ASSERTIONS` (which predates hardening modes)
// equivalent to setting the safe mode.
# ifdef _LIBCPP_ENABLE_ASSERTIONS
# warning "_LIBCPP_ENABLE_ASSERTIONS is deprecated, please use _LIBCPP_ENABLE_SAFE_MODE instead."
# if _LIBCPP_ENABLE_ASSERTIONS != 0 && _LIBCPP_ENABLE_ASSERTIONS != 1
# error "_LIBCPP_ENABLE_ASSERTIONS must be set to 0 or 1"
# endif
# if _LIBCPP_ENABLE_ASSERTIONS
# define _LIBCPP_ENABLE_SAFE_MODE 1
# endif
# endif
// Enables the hardened mode which consists of all checks intended to be used in production. Hardened mode prioritizes
// security-critical checks that can be done with relatively little overhead in constant time. Mutually exclusive with
// `_LIBCPP_ENABLE_SAFE_MODE` and `_LIBCPP_ENABLE_DEBUG_MODE`.
//
// #define _LIBCPP_ENABLE_HARDENED_MODE 1
// Enables the safe mode which extends the hardened mode with checks that are relatively cheap and prevent common types
// of errors but are not security-critical. Mutually exclusive with `_LIBCPP_ENABLE_HARDENED_MODE` and
// `_LIBCPP_ENABLE_DEBUG_MODE`.
//
// #define _LIBCPP_ENABLE_SAFE_MODE 1
// Enables the debug mode which contains all the checks from the hardened mode and additionally more expensive checks
// that may affect the complexity of algorithms. The debug mode is intended to be used for testing, not in production.
// Mutually exclusive with `_LIBCPP_ENABLE_HARDENED_MODE` and `_LIBCPP_ENABLE_SAFE_MODE`.
//
// #define _LIBCPP_ENABLE_DEBUG_MODE 1
// 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_OVERLAPPING_RANGES` -- for functions that take several ranges as arguments, checks that the
// given ranges do not overlap.
//
// - `_LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR` -- checks any operations that exchange nodes between containers to make sure
// the containers have compatible allocators.
//
// - `_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.
# ifndef _LIBCPP_ENABLE_HARDENED_MODE
# define _LIBCPP_ENABLE_HARDENED_MODE _LIBCPP_ENABLE_HARDENED_MODE_DEFAULT
# endif
# if _LIBCPP_ENABLE_HARDENED_MODE != 0 && _LIBCPP_ENABLE_HARDENED_MODE != 1
# error "_LIBCPP_ENABLE_HARDENED_MODE must be set to 0 or 1."
# endif
# ifndef _LIBCPP_ENABLE_SAFE_MODE
# define _LIBCPP_ENABLE_SAFE_MODE _LIBCPP_ENABLE_SAFE_MODE_DEFAULT
# endif
# if _LIBCPP_ENABLE_SAFE_MODE != 0 && _LIBCPP_ENABLE_SAFE_MODE != 1
# error "_LIBCPP_ENABLE_SAFE_MODE must be set to 0 or 1."
# endif
# ifndef _LIBCPP_ENABLE_DEBUG_MODE
# define _LIBCPP_ENABLE_DEBUG_MODE _LIBCPP_ENABLE_DEBUG_MODE_DEFAULT
# endif
# if _LIBCPP_ENABLE_DEBUG_MODE != 0 && _LIBCPP_ENABLE_DEBUG_MODE != 1
# error "_LIBCPP_ENABLE_DEBUG_MODE must be set to 0 or 1."
# endif
# if (_LIBCPP_ENABLE_HARDENED_MODE && _LIBCPP_ENABLE_SAFE_MODE) || \
(_LIBCPP_ENABLE_HARDENED_MODE && _LIBCPP_ENABLE_DEBUG_MODE) || \
(_LIBCPP_ENABLE_SAFE_MODE && _LIBCPP_ENABLE_DEBUG_MODE)
# error \
"Only one of _LIBCPP_ENABLE_HARDENED_MODE, _LIBCPP_ENABLE_SAFE_MODE and _LIBCPP_ENABLE_DEBUG_MODE can be enabled."
# endif
// clang-format off
// Hardened mode checks.
# if _LIBCPP_ENABLE_HARDENED_MODE
// Enabled checks.
# define _LIBCPP_ASSERT_VALID_INPUT_RANGE(expression, message) _LIBCPP_ASSERT(expression, message)
# define _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(expression, message) _LIBCPP_ASSERT(expression, message)
// Disabled checks.
// Overlapping ranges will make algorithms produce incorrect results but don't directly lead to a security
// vulnerability.
# define _LIBCPP_ASSERT_NON_OVERLAPPING_RANGES(expression, message) _LIBCPP_ASSUME(expression)
# define _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(expression, message) _LIBCPP_ASSUME(expression)
# define _LIBCPP_ASSERT_INTERNAL(expression, message) _LIBCPP_ASSUME(expression)
# define _LIBCPP_ASSERT_UNCATEGORIZED(expression, message) _LIBCPP_ASSUME(expression)
// Safe mode checks.
# elif _LIBCPP_ENABLE_SAFE_MODE
// Enabled checks.
# define _LIBCPP_ASSERT_VALID_INPUT_RANGE(expression, message) _LIBCPP_ASSERT(expression, message)
# define _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(expression, message) _LIBCPP_ASSERT(expression, message)
# define _LIBCPP_ASSERT_NON_OVERLAPPING_RANGES(expression, message) _LIBCPP_ASSERT(expression, message)
# define _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(expression, message) _LIBCPP_ASSERT(expression, message)
# define _LIBCPP_ASSERT_UNCATEGORIZED(expression, message) _LIBCPP_ASSERT(expression, message)
// Disabled checks.
# define _LIBCPP_ASSERT_INTERNAL(expression, message) _LIBCPP_ASSUME(expression)
// Debug mode checks.
# elif _LIBCPP_ENABLE_DEBUG_MODE
// All checks enabled.
# define _LIBCPP_ASSERT_VALID_INPUT_RANGE(expression, message) _LIBCPP_ASSERT(expression, message)
# define _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(expression, message) _LIBCPP_ASSERT(expression, message)
# define _LIBCPP_ASSERT_NON_OVERLAPPING_RANGES(expression, message) _LIBCPP_ASSERT(expression, message)
# define _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(expression, message) _LIBCPP_ASSERT(expression, message)
# define _LIBCPP_ASSERT_INTERNAL(expression, message) _LIBCPP_ASSERT(expression, message)
# define _LIBCPP_ASSERT_UNCATEGORIZED(expression, message) _LIBCPP_ASSERT(expression, message)
// Disable all checks if hardening is not enabled.
# else
// All checks disabled.
# define _LIBCPP_ASSERT_VALID_INPUT_RANGE(expression, message) _LIBCPP_ASSUME(expression)
# define _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(expression, message) _LIBCPP_ASSUME(expression)
# define _LIBCPP_ASSERT_NON_OVERLAPPING_RANGES(expression, message) _LIBCPP_ASSUME(expression)
# define _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(expression, message) _LIBCPP_ASSUME(expression)
# define _LIBCPP_ASSERT_INTERNAL(expression, message) _LIBCPP_ASSUME(expression)
# define _LIBCPP_ASSERT_UNCATEGORIZED(expression, message) _LIBCPP_ASSUME(expression)
# endif // _LIBCPP_ENABLE_HARDENED_MODE
// clang-format on
// } 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_attribute
# define __has_attribute(__x) 0
# endif
# ifndef __has_builtin
# define __has_builtin(__x) 0
# endif
# ifndef __has_extension
# define __has_extension(__x) 0
# endif
# ifndef __has_feature
# define __has_feature(__x) 0
# endif
# ifndef __has_cpp_attribute
# define __has_cpp_attribute(__x) 0
# endif
# ifndef __has_constexpr_builtin
# define __has_constexpr_builtin(x) 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_include
# define __has_include(...) 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
// FIXME: ABI detection should be done via compiler builtin macros. This
// is just a placeholder until Clang implements such macros. For now assume
// that Windows compilers pretending to be MSVC++ target the Microsoft ABI,
// and allow the user to explicitly specify the ABI to handle cases where this
// heuristic falls short.
# if defined(_LIBCPP_ABI_FORCE_ITANIUM) && defined(_LIBCPP_ABI_FORCE_MICROSOFT)
# error "Only one of _LIBCPP_ABI_FORCE_ITANIUM and _LIBCPP_ABI_FORCE_MICROSOFT can be defined"
# elif defined(_LIBCPP_ABI_FORCE_ITANIUM)
# define _LIBCPP_ABI_ITANIUM
# elif defined(_LIBCPP_ABI_FORCE_MICROSOFT)
# define _LIBCPP_ABI_MICROSOFT
# else
# if defined(_WIN32) && defined(_MSC_VER)
# define _LIBCPP_ABI_MICROSOFT
# else
# define _LIBCPP_ABI_ITANIUM
# endif
# 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_NO_INCOMPLETE_PSTL
# define _LIBCPP_HAS_NO_EXPERIMENTAL_STOP_TOKEN
# define _LIBCPP_HAS_NO_INCOMPLETE_TZDB
# endif
// Need to detect which libc we're using if we're on Linux.
# if defined(__linux__)
# include <features.h>
# if defined(__GLIBC_PREREQ)
# define _LIBCPP_GLIBC_PREREQ(a, b) __GLIBC_PREREQ(a, b)
# else
# define _LIBCPP_GLIBC_PREREQ(a, b) 0
# endif // defined(__GLIBC_PREREQ)
# endif // defined(__linux__)
# if defined(__MVS__)
# include <features.h> // for __NATIVE_ASCII_F
# endif
# ifndef __BYTE_ORDER__
# error \
"Your compiler doesn't seem to define __BYTE_ORDER__, which is required by libc++ to know the endianness of your target platform"
# endif
# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define _LIBCPP_LITTLE_ENDIAN
# elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
# define _LIBCPP_BIG_ENDIAN
# endif // __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
# 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
# endif
# define _LIBCPP_HAS_OPEN_WITH_WCHAR
# 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
# if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC)
# define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi")))
# else
# define _LIBCPP_NO_CFI
# endif
# ifndef _LIBCPP_CXX03_LANG
# define _LIBCPP_ALIGNOF(_Tp) alignof(_Tp)
# define _ALIGNAS_TYPE(x) alignas(x)
# define _ALIGNAS(x) alignas(x)
# define _LIBCPP_NORETURN [[noreturn]]
# define _NOEXCEPT noexcept
# define _NOEXCEPT_(x) noexcept(x)
# 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 _LIBCPP_NORETURN __attribute__((__noreturn__))
# define _LIBCPP_HAS_NO_NOEXCEPT
# define nullptr __nullptr
# define _NOEXCEPT throw()
# define _NOEXCEPT_(x)
# 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
# if !defined(__cpp_exceptions) || __cpp_exceptions < 199711L
# define _LIBCPP_HAS_NO_EXCEPTIONS
# endif
# define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp)
# if defined(_LIBCPP_COMPILER_CLANG_BASED)
# if defined(__APPLE__)
# if defined(__i386__) || defined(__x86_64__)
// use old string layout on x86_64 and i386
# elif defined(__arm__)
// use old string layout on arm (which does not include aarch64/arm64), except on watch ABIs
# if defined(__ARM_ARCH_7K__) && __ARM_ARCH_7K__ >= 2
# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
# endif
# else
# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
# endif
# endif
// Objective-C++ features (opt-in)
# if __has_feature(objc_arc)
# define _LIBCPP_HAS_OBJC_ARC
# endif
# if __has_feature(objc_arc_weak)
# define _LIBCPP_HAS_OBJC_ARC_WEAK
# endif
# if __has_extension(blocks)
# define _LIBCPP_HAS_EXTENSION_BLOCKS
# endif
# if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) && defined(__APPLE__)
# define _LIBCPP_HAS_BLOCKS_RUNTIME
# endif
# if !__has_feature(address_sanitizer)
# define _LIBCPP_HAS_NO_ASAN
# endif
// Allow for build-time disabling of unsigned integer sanitization
# if __has_attribute(no_sanitize)
# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow")))
# endif
# define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__))
# define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__
# elif defined(_LIBCPP_COMPILER_GCC)
# if !defined(__SANITIZE_ADDRESS__)
# define _LIBCPP_HAS_NO_ASAN
# endif
# define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__))
# define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__
# endif // _LIBCPP_COMPILER_[CLANG|GCC]
# 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
// 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 changes with each version of libc++. This ensures
// that no ODR violation can arise from mixing two TUs compiled with different versions
// of libc++ where we would have changed the definition of a symbol. If the symbols shared
// the same name, the ODR would require that their definitions be token-by-token equivalent,
// which basically prevents us from being able to make any change to any function in our
// headers. Using this ABI tag ensures that the symbol name is "bumped" artificially at
// each release, which lets us change the definition of these symbols at our leisure.
// Note that historically, this 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.
//
// 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_VERSIONED_IDENTIFIER))))
# 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
// This macro provides a HIDE_FROM_ABI equivalent that can be applied to extern
// "C" function, as those lack mangling.
# define _LIBCPP_HIDE_FROM_ABI_C _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
// Just so we can migrate to the new macros gradually.
# define _LIBCPP_INLINE_VISIBILITY _LIBCPP_HIDE_FROM_ABI
// Inline namespaces are available in Clang/GCC/MSVC regardless of C++ dialect.
// clang-format off
# define _LIBCPP_BEGIN_NAMESPACE_STD namespace _LIBCPP_TYPE_VISIBILITY_DEFAULT std { \
inline namespace _LIBCPP_ABI_NAMESPACE {
# define _LIBCPP_END_NAMESPACE_STD }}
# define _VSTD std
_LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_END_NAMESPACE_STD
# if _LIBCPP_STD_VER >= 17
# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM \
_LIBCPP_BEGIN_NAMESPACE_STD inline namespace __fs { namespace filesystem {
# else
# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM \
_LIBCPP_BEGIN_NAMESPACE_STD namespace __fs { namespace filesystem {
# endif
# define _LIBCPP_END_NAMESPACE_FILESYSTEM _LIBCPP_END_NAMESPACE_STD }}
// clang-format on
# define _VSTD_FS std::__fs::filesystem
# if __has_attribute(__enable_if__)
# define _LIBCPP_PREFERRED_OVERLOAD __attribute__((__enable_if__(true, "")))
# endif
# if !defined(__SIZEOF_INT128__) || defined(_MSC_VER)
# define _LIBCPP_HAS_NO_INT128
# 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
# 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_INLINE_VISIBILITY x(__lx __v) : __v_(__v) {} \
_LIBCPP_INLINE_VISIBILITY explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \
_LIBCPP_INLINE_VISIBILITY 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
# if defined(__APPLE__) || defined(__FreeBSD__) || defined(_LIBCPP_MSVCRT_LIKE) || defined(__NetBSD__)
# define _LIBCPP_LOCALE__L_EXTENSIONS 1
# endif
# 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_NO_LIBRARY_ALIGNED_ALLOCATION
# 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_NO_LIBRARY_ALIGNED_ALLOCATION
# elif defined(__MVS__)
# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
# endif
# if defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) || (!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606)
# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
# 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)
# define _LIBCPP_HAS_NO_C11_ALIGNED_ALLOC
# endif
# elif defined(__ANDROID__) && __ANDROID_API__ < 28
// Android only provides aligned_alloc when targeting API 28 or higher.
# define _LIBCPP_HAS_NO_C11_ALIGNED_ALLOC
# 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_NO_CHAR8_T
# 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 !defined(_LIBCPP_HAS_NO_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 __has_cpp_attribute(nodiscard)
# define _LIBCPP_NODISCARD [[__nodiscard__]]
# else
// We can't use GCC's [[gnu::warn_unused_result]] and
// __attribute__((warn_unused_result)), because GCC does not silence them via
// (void) cast.
# define _LIBCPP_NODISCARD
# endif
// _LIBCPP_NODISCARD_EXT may be used to apply [[nodiscard]] to entities not
// specified as such as an extension.