third_party/llvm-project/libcxx/include/__availability - cobalt.git - Git at Google


            
            // -*- 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___AVAILABILITY

            
            #define _LIBCPP___AVAILABILITY


            #include <__config>


            #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)

            
            #  pragma GCC system_header

            
            #endif


            // Libc++ is shipped by various vendors. In particular, it is used as a system

            
            // library on macOS, iOS and other Apple platforms. In order for users to be

            
            // able to compile a binary that is intended to be deployed to an older version

            
            // of a platform, Clang provides availability attributes [1]. These attributes

            
            // can be placed on declarations and are used to describe the life cycle of a

            
            // symbol in the library.

            
            //

            
            // The main goal is to ensure a compile-time error if a symbol that hasn't been

            
            // introduced in a previously released library is used in a program that targets

            
            // that previously released library. Normally, this would be a load-time error

            
            // when one tries to launch the program against the older library.

            
            //

            
            // For example, the filesystem library was introduced in the dylib in macOS 10.15.

            
            // If a user compiles on a macOS 10.15 host but targets macOS 10.13 with their

            
            // program, the compiler would normally not complain (because the required

            
            // declarations are in the headers), but the dynamic loader would fail to find

            
            // the symbols when actually trying to launch the program on macOS 10.13. To

            
            // turn this into a compile-time issue instead, declarations are annotated with

            
            // when they were introduced, and the compiler can produce a diagnostic if the

            
            // program references something that isn't available on the deployment target.

            
            //

            
            // This mechanism is general in nature, and any vendor can add their markup to

            
            // the library (see below). Whenever a new feature is added that requires support

            
            // in the shared library, two macros are added below to allow marking the feature

            
            // as unavailable:

            
            // 1. A macro named `_LIBCPP_AVAILABILITY_HAS_NO_<feature>` which must be defined

            
            //    exactly when compiling for a target that doesn't support the feature.

            
            // 2. A macro named `_LIBCPP_AVAILABILITY_<feature>`, which must always be defined

            
            //    and must expand to the proper availability attribute for the platform.

            
            //

            
            // When vendors decide to ship the feature as part of their shared library, they

            
            // can update these macros appropriately for their platform, and the library will

            
            // use those to provide an optimal user experience.

            
            //

            
            // Furthermore, many features in the standard library have corresponding

            
            // feature-test macros. The `_LIBCPP_AVAILABILITY_HAS_NO_<feature>` macros

            
            // are checked by the corresponding feature-test macros generated by

            
            // generate_feature_test_macro_components.py to ensure that the library

            
            // doesn't announce a feature as being implemented if it is unavailable on

            
            // the deployment target.

            
            //

            
            // Note that this mechanism is disabled by default in the "upstream" libc++.

            
            // Availability annotations are only meaningful when shipping libc++ inside

            
            // a platform (i.e. as a system library), and so vendors that want them should

            
            // turn those annotations on at CMake configuration time.

            
            //

            
            // [1]: https://clang.llvm.org/docs/AttributeReference.html#availability


            // For backwards compatibility, allow users to define _LIBCPP_DISABLE_AVAILABILITY

            
            // for a while.

            
            #if defined(_LIBCPP_DISABLE_AVAILABILITY)

            
            #   if !defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)

            
            #       define _LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS

            
            #   endif

            
            #endif


            // Availability markup is disabled when building the library, or when the compiler

            
            // doesn't support the proper attributes.

            
            #if defined(_LIBCPP_BUILDING_LIBRARY) ||                                        \

            
                defined(_LIBCXXABI_BUILDING_LIBRARY) ||                                     \

            
                !__has_feature(attribute_availability_with_strict) ||                       \

            
                !__has_feature(attribute_availability_in_templates) ||                      \

            
                !__has_extension(pragma_clang_attribute_external_declaration)

            
            #   if !defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)

            
            #       define _LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS

            
            #   endif

            
            #endif


            #if defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)


                // This controls the availability of std::shared_mutex and std::shared_timed_mutex,

            
                // which were added to the dylib later.

            
            // #   define _LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX

            
            #   define _LIBCPP_AVAILABILITY_SHARED_MUTEX


                // These macros control the availability of std::bad_optional_access and

            
                // other exception types. These were put in the shared library to prevent

            
                // code bloat from every user program defining the vtable for these exception

            
                // types.

            
                //

            
                // Note that when exceptions are disabled, the methods that normally throw

            
                // these exceptions can be used even on older deployment targets, but those

            
                // methods will abort instead of throwing.

            
            // #   define _LIBCPP_AVAILABILITY_HAS_NO_BAD_OPTIONAL_ACCESS

            
            #   define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS


            // #   define _LIBCPP_AVAILABILITY_HAS_NO_BAD_VARIANT_ACCESS

            
            #   define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS


            // #   define _LIBCPP_AVAILABILITY_HAS_NO_BAD_ANY_CAST

            
            #   define _LIBCPP_AVAILABILITY_BAD_ANY_CAST


                // This controls the availability of std::uncaught_exceptions().

            
            // #   define _LIBCPP_AVAILABILITY_HAS_NO_UNCAUGHT_EXCEPTIONS

            
            #   define _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS


                // This controls the availability of the sized version of ::operator delete,

            
                // ::operator delete[], and their align_val_t variants, which were all added

            
                // in C++17, and hence not present in early dylibs.

            
            // #   define _LIBCPP_AVAILABILITY_HAS_NO_SIZED_NEW_DELETE

            
            #   define _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE


                // This controls the availability of the std::future_error exception.

            
                //

            
                // Note that when exceptions are disabled, the methods that normally throw

            
                // std::future_error can be used even on older deployment targets, but those

            
                // methods will abort instead of throwing.

            
            // #   define _LIBCPP_AVAILABILITY_HAS_NO_FUTURE_ERROR

            
            #   define _LIBCPP_AVAILABILITY_FUTURE_ERROR


                // This controls the availability of std::type_info's vtable.

            
                // I can't imagine how using std::type_info can work at all if

            
                // this isn't supported.

            
            // #   define _LIBCPP_AVAILABILITY_HAS_NO_TYPEINFO_VTABLE

            
            #   define _LIBCPP_AVAILABILITY_TYPEINFO_VTABLE


                // This controls the availability of std::locale::category members

            
                // (e.g. std::locale::collate), which are defined in the dylib.

            
            // #   define _LIBCPP_AVAILABILITY_HAS_NO_LOCALE_CATEGORY

            
            #   define _LIBCPP_AVAILABILITY_LOCALE_CATEGORY


                // This controls the availability of atomic operations on std::shared_ptr

            
                // (e.g. `std::atomic_store(std::shared_ptr)`), which require a shared

            
                // lock table located in the dylib.

            
            // #   define _LIBCPP_AVAILABILITY_HAS_NO_ATOMIC_SHARED_PTR

            
            #   define _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR


                // These macros control the availability of all parts of <filesystem> that

            
                // depend on something in the dylib.

            
            // #   define _LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM

            
            #   define _LIBCPP_AVAILABILITY_FILESYSTEM

            
            #   define _LIBCPP_AVAILABILITY_FILESYSTEM_PUSH

            
            #   define _LIBCPP_AVAILABILITY_FILESYSTEM_POP


                // This controls the availability of floating-point std::to_chars functions.

            
                // These overloads were added later than the integer overloads.

            
            // #   define _LIBCPP_AVAILABILITY_HAS_NO_TO_CHARS_FLOATING_POINT

            
            #   define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT


                // This controls the availability of the C++20 synchronization library,

            
                // which requires shared library support for various operations

            
                // (see libcxx/src/atomic.cpp). This includes <barier>, <latch>,

            
                // <semaphore>, and notification functions on std::atomic.

            
            // #   define _LIBCPP_AVAILABILITY_HAS_NO_SYNC

            
            #   define _LIBCPP_AVAILABILITY_SYNC


                // This controls whether the library claims to provide a default verbose

            
                // termination function, and consequently whether the headers will try

            
                // to use it when the mechanism isn't overriden at compile-time.

            
            // #   define _LIBCPP_AVAILABILITY_HAS_NO_VERBOSE_ABORT

            
            #   define _LIBCPP_AVAILABILITY_VERBOSE_ABORT


            #elif defined(__APPLE__)


                // shared_mutex and shared_timed_mutex

            
            #   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101200) ||    \

            
                    (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 100000) || \

            
                    (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 100000) ||         \

            
                    (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 30000)

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX

            
            #   endif

            
            #   define _LIBCPP_AVAILABILITY_SHARED_MUTEX                                    \

            
                    __attribute__((availability(macos,strict,introduced=10.12)))            \

            
                    __attribute__((availability(ios,strict,introduced=10.0)))               \

            
                    __attribute__((availability(tvos,strict,introduced=10.0)))              \

            
                    __attribute__((availability(watchos,strict,introduced=3.0)))


                    // bad_optional_access, bad_variant_access and bad_any_cast

            
                    // Note: bad_optional_access & friends were not introduced in the matching

            
                    // macOS and iOS versions, so the version mismatch between macOS and others

            
                    // is intended.

            
            #   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101300) ||    \

            
                    (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 120000) || \

            
                    (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 120000) ||         \

            
                    (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000)

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_BAD_OPTIONAL_ACCESS

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_BAD_VARIANT_ACCESS

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_BAD_ANY_CAST

            
            #   endif

            
            #   define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS                             \

            
                    __attribute__((availability(macos,strict,introduced=10.13)))            \

            
                    __attribute__((availability(ios,strict,introduced=12.0)))               \

            
                    __attribute__((availability(tvos,strict,introduced=12.0)))              \

            
                    __attribute__((availability(watchos,strict,introduced=5.0)))

            
            #   define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS                              \

            
                    _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS

            
            #   define _LIBCPP_AVAILABILITY_BAD_ANY_CAST                                    \

            
                    _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS


                // uncaught_exceptions

            
            #   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101200) ||    \

            
                    (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 100000) || \

            
                    (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 100000) ||         \

            
                    (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 30000)

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_UNCAUGHT_EXCEPTIONS

            
            #   endif

            
            #   define _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS                             \

            
                    __attribute__((availability(macos,strict,introduced=10.12)))            \

            
                    __attribute__((availability(ios,strict,introduced=10.0)))               \

            
                    __attribute__((availability(tvos,strict,introduced=10.0)))              \

            
                    __attribute__((availability(watchos,strict,introduced=3.0)))


                // sized operator new and sized operator delete

            
            #   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101200) ||    \

            
                    (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 100000) || \

            
                    (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 100000) ||         \

            
                    (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 30000)

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_SIZED_NEW_DELETE

            
            #   endif

            
            #   define _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE                                \

            
                    __attribute__((availability(macos,strict,introduced=10.12)))            \

            
                    __attribute__((availability(ios,strict,introduced=10.0)))               \

            
                    __attribute__((availability(tvos,strict,introduced=10.0)))              \

            
                    __attribute__((availability(watchos,strict,introduced=3.0)))


                // future_error

            
            #   if (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 60000)

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_FUTURE_ERROR

            
            #   endif

            
            #   define _LIBCPP_AVAILABILITY_FUTURE_ERROR                                    \

            
                    __attribute__((availability(ios,strict,introduced=6.0)))


                // type_info's vtable

            
            #   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 100900) ||    \

            
                    (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 70000)

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_TYPEINFO_VTABLE

            
            #   endif

            
            #   define _LIBCPP_AVAILABILITY_TYPEINFO_VTABLE                                 \

            
                    __attribute__((availability(macos,strict,introduced=10.9)))             \

            
                    __attribute__((availability(ios,strict,introduced=7.0)))


                // locale::category

            
            #   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 100900) ||    \

            
                    (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 70000)

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_LOCALE_CATEGORY

            
            #   endif

            
            #   define _LIBCPP_AVAILABILITY_LOCALE_CATEGORY                                 \

            
                    __attribute__((availability(macos,strict,introduced=10.9)))             \

            
                    __attribute__((availability(ios,strict,introduced=7.0)))


                // atomic operations on shared_ptr

            
            #   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 100900) ||    \

            
                    (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 70000)

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_ATOMIC_SHARED_PTR

            
            #   endif

            
            #   define _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR                               \

            
                    __attribute__((availability(macos,strict,introduced=10.9)))             \

            
                    __attribute__((availability(ios,strict,introduced=7.0)))


                // <filesystem>

            
            #   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) || \

            
                    (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 130000) ||         \

            
                    (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 60000)

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM

            
            #   endif

            
            #   define _LIBCPP_AVAILABILITY_FILESYSTEM                                      \

            
                    __attribute__((availability(macos,strict,introduced=10.15)))            \

            
                    __attribute__((availability(ios,strict,introduced=13.0)))               \

            
                    __attribute__((availability(tvos,strict,introduced=13.0)))              \

            
                    __attribute__((availability(watchos,strict,introduced=6.0)))

            
            #   define _LIBCPP_AVAILABILITY_FILESYSTEM_PUSH                                 \

            
                    _Pragma("clang attribute push(__attribute__((availability(macos,strict,introduced=10.15))), apply_to=any(function,record))") \

            
                    _Pragma("clang attribute push(__attribute__((availability(ios,strict,introduced=13.0))), apply_to=any(function,record))")    \

            
                    _Pragma("clang attribute push(__attribute__((availability(tvos,strict,introduced=13.0))), apply_to=any(function,record))")   \

            
                    _Pragma("clang attribute push(__attribute__((availability(watchos,strict,introduced=6.0))), apply_to=any(function,record))")

            
            #   define _LIBCPP_AVAILABILITY_FILESYSTEM_POP                                  \

            
                    _Pragma("clang attribute pop")                                          \

            
                    _Pragma("clang attribute pop")                                          \

            
                    _Pragma("clang attribute pop")                                          \

            
                    _Pragma("clang attribute pop")


                // std::to_chars(floating-point)

            
            #   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 130300) ||    \

            
                    (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 160300) || \

            
                    (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 160300) ||         \

            
                    (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 90300)

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_TO_CHARS_FLOATING_POINT

            
            #   endif

            
            #   define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT                         \

            
                    __attribute__((availability(macos,strict,introduced=13.3)))             \

            
                    __attribute__((availability(ios,strict,introduced=16.3)))               \

            
                    __attribute__((availability(tvos,strict,introduced=16.3)))              \

            
                    __attribute__((availability(watchos,strict,introduced=9.3)))


                // c++20 synchronization library

            
            #   if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 110000) ||    \

            
                    (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 140000) || \

            
                    (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 140000) ||         \

            
                    (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 70000)

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_SYNC

            
            #   endif

            
            #   define _LIBCPP_AVAILABILITY_SYNC                                            \

            
                    __attribute__((availability(macos,strict,introduced=11.0)))             \

            
                    __attribute__((availability(ios,strict,introduced=14.0)))               \

            
                    __attribute__((availability(tvos,strict,introduced=14.0)))              \

            
                    __attribute__((availability(watchos,strict,introduced=7.0)))


                // __libcpp_verbose_abort

            
            #   if 1 // TODO: Update once this is released

            
            #       define _LIBCPP_AVAILABILITY_HAS_NO_VERBOSE_ABORT

            
            #   endif

            
            #   define _LIBCPP_AVAILABILITY_VERBOSE_ABORT                                   \

            
                    __attribute__((unavailable))


            #else


            // ...New vendors can add availability markup here...


            #   error "It looks like you're trying to enable vendor availability markup, but you haven't defined the corresponding macros yet!"


            #endif


            // Define availability attributes that depend on _LIBCPP_HAS_NO_EXCEPTIONS.

            
            // Those are defined in terms of the availability attributes above, and

            
            // should not be vendor-specific.

            
            #if defined(_LIBCPP_HAS_NO_EXCEPTIONS)

            
            #   define _LIBCPP_AVAILABILITY_FUTURE

            
            #   define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST

            
            #   define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS

            
            #   define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS

            
            #else

            
            #   define _LIBCPP_AVAILABILITY_FUTURE                    _LIBCPP_AVAILABILITY_FUTURE_ERROR

            
            #   define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST        _LIBCPP_AVAILABILITY_BAD_ANY_CAST

            
            #   define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS

            
            #   define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS  _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS

            
            #endif


            #endif // _LIBCPP___AVAILABILITY
	// -- 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___AVAILABILITY
	#define _LIBCPP___AVAILABILITY

	#include <__config>

	#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
	# pragma GCC system_header
	#endif

	// Libc++ is shipped by various vendors. In particular, it is used as a system
	// library on macOS, iOS and other Apple platforms. In order for users to be
	// able to compile a binary that is intended to be deployed to an older version
	// of a platform, Clang provides availability attributes [1]. These attributes
	// can be placed on declarations and are used to describe the life cycle of a
	// symbol in the library.
	//
	// The main goal is to ensure a compile-time error if a symbol that hasn't been
	// introduced in a previously released library is used in a program that targets
	// that previously released library. Normally, this would be a load-time error
	// when one tries to launch the program against the older library.
	//
	// For example, the filesystem library was introduced in the dylib in macOS 10.15.
	// If a user compiles on a macOS 10.15 host but targets macOS 10.13 with their
	// program, the compiler would normally not complain (because the required
	// declarations are in the headers), but the dynamic loader would fail to find
	// the symbols when actually trying to launch the program on macOS 10.13. To
	// turn this into a compile-time issue instead, declarations are annotated with
	// when they were introduced, and the compiler can produce a diagnostic if the
	// program references something that isn't available on the deployment target.
	//
	// This mechanism is general in nature, and any vendor can add their markup to
	// the library (see below). Whenever a new feature is added that requires support
	// in the shared library, two macros are added below to allow marking the feature
	// as unavailable:
	// 1. A macro named `_LIBCPP_AVAILABILITY_HAS_NO_<feature>` which must be defined
	// exactly when compiling for a target that doesn't support the feature.
	// 2. A macro named `_LIBCPP_AVAILABILITY_<feature>`, which must always be defined
	// and must expand to the proper availability attribute for the platform.
	//
	// When vendors decide to ship the feature as part of their shared library, they
	// can update these macros appropriately for their platform, and the library will
	// use those to provide an optimal user experience.
	//
	// Furthermore, many features in the standard library have corresponding
	// feature-test macros. The `_LIBCPP_AVAILABILITY_HAS_NO_<feature>` macros
	// are checked by the corresponding feature-test macros generated by
	// generate_feature_test_macro_components.py to ensure that the library
	// doesn't announce a feature as being implemented if it is unavailable on
	// the deployment target.
	//
	// Note that this mechanism is disabled by default in the "upstream" libc++.
	// Availability annotations are only meaningful when shipping libc++ inside
	// a platform (i.e. as a system library), and so vendors that want them should
	// turn those annotations on at CMake configuration time.
	//
	// [1]: https://clang.llvm.org/docs/AttributeReference.html#availability


	// For backwards compatibility, allow users to define _LIBCPP_DISABLE_AVAILABILITY
	// for a while.
	#if defined(_LIBCPP_DISABLE_AVAILABILITY)
	# if !defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)
	# define _LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS
	# endif
	#endif

	// Availability markup is disabled when building the library, or when the compiler
	// doesn't support the proper attributes.
	#if defined(_LIBCPP_BUILDING_LIBRARY) \|\| \
	defined(_LIBCXXABI_BUILDING_LIBRARY) \|\| \
	!__has_feature(attribute_availability_with_strict) \|\| \
	!__has_feature(attribute_availability_in_templates) \|\| \
	!__has_extension(pragma_clang_attribute_external_declaration)
	# if !defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)
	# define _LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS
	# endif
	#endif

	#if defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)

	// This controls the availability of std::shared_mutex and std::shared_timed_mutex,
	// which were added to the dylib later.
	// # define _LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX
	# define _LIBCPP_AVAILABILITY_SHARED_MUTEX

	// These macros control the availability of std::bad_optional_access and
	// other exception types. These were put in the shared library to prevent
	// code bloat from every user program defining the vtable for these exception
	// types.
	//
	// Note that when exceptions are disabled, the methods that normally throw
	// these exceptions can be used even on older deployment targets, but those
	// methods will abort instead of throwing.
	// # define _LIBCPP_AVAILABILITY_HAS_NO_BAD_OPTIONAL_ACCESS
	# define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS

	// # define _LIBCPP_AVAILABILITY_HAS_NO_BAD_VARIANT_ACCESS
	# define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS

	// # define _LIBCPP_AVAILABILITY_HAS_NO_BAD_ANY_CAST
	# define _LIBCPP_AVAILABILITY_BAD_ANY_CAST

	// This controls the availability of std::uncaught_exceptions().
	// # define _LIBCPP_AVAILABILITY_HAS_NO_UNCAUGHT_EXCEPTIONS
	# define _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS

	// This controls the availability of the sized version of ::operator delete,
	// ::operator delete[], and their align_val_t variants, which were all added
	// in C++17, and hence not present in early dylibs.
	// # define _LIBCPP_AVAILABILITY_HAS_NO_SIZED_NEW_DELETE
	# define _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE

	// This controls the availability of the std::future_error exception.
	//
	// Note that when exceptions are disabled, the methods that normally throw
	// std::future_error can be used even on older deployment targets, but those
	// methods will abort instead of throwing.
	// # define _LIBCPP_AVAILABILITY_HAS_NO_FUTURE_ERROR
	# define _LIBCPP_AVAILABILITY_FUTURE_ERROR

	// This controls the availability of std::type_info's vtable.
	// I can't imagine how using std::type_info can work at all if
	// this isn't supported.
	// # define _LIBCPP_AVAILABILITY_HAS_NO_TYPEINFO_VTABLE
	# define _LIBCPP_AVAILABILITY_TYPEINFO_VTABLE

	// This controls the availability of std::locale::category members
	// (e.g. std::locale::collate), which are defined in the dylib.
	// # define _LIBCPP_AVAILABILITY_HAS_NO_LOCALE_CATEGORY
	# define _LIBCPP_AVAILABILITY_LOCALE_CATEGORY

	// This controls the availability of atomic operations on std::shared_ptr
	// (e.g. `std::atomic_store(std::shared_ptr)`), which require a shared
	// lock table located in the dylib.
	// # define _LIBCPP_AVAILABILITY_HAS_NO_ATOMIC_SHARED_PTR
	# define _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR

	// These macros control the availability of all parts of <filesystem> that
	// depend on something in the dylib.
	// # define _LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM
	# define _LIBCPP_AVAILABILITY_FILESYSTEM
	# define _LIBCPP_AVAILABILITY_FILESYSTEM_PUSH
	# define _LIBCPP_AVAILABILITY_FILESYSTEM_POP

	// This controls the availability of floating-point std::to_chars functions.
	// These overloads were added later than the integer overloads.
	// # define _LIBCPP_AVAILABILITY_HAS_NO_TO_CHARS_FLOATING_POINT
	# define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT

	// This controls the availability of the C++20 synchronization library,
	// which requires shared library support for various operations
	// (see libcxx/src/atomic.cpp). This includes <barier>, <latch>,
	// <semaphore>, and notification functions on std::atomic.
	// # define _LIBCPP_AVAILABILITY_HAS_NO_SYNC
	# define _LIBCPP_AVAILABILITY_SYNC

	// This controls whether the library claims to provide a default verbose
	// termination function, and consequently whether the headers will try
	// to use it when the mechanism isn't overriden at compile-time.
	// # define _LIBCPP_AVAILABILITY_HAS_NO_VERBOSE_ABORT
	# define _LIBCPP_AVAILABILITY_VERBOSE_ABORT

	#elif defined(__APPLE__)

	// shared_mutex and shared_timed_mutex
	# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101200) \|\| \
	(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 100000) \|\| \
	(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 100000) \|\| \
	(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 30000)
	# define _LIBCPP_AVAILABILITY_HAS_NO_SHARED_MUTEX
	# endif
	# define _LIBCPP_AVAILABILITY_SHARED_MUTEX \
	__attribute__((availability(macos,strict,introduced=10.12))) \
	__attribute__((availability(ios,strict,introduced=10.0))) \
	__attribute__((availability(tvos,strict,introduced=10.0))) \
	__attribute__((availability(watchos,strict,introduced=3.0)))

	// bad_optional_access, bad_variant_access and bad_any_cast
	// Note: bad_optional_access & friends were not introduced in the matching
	// macOS and iOS versions, so the version mismatch between macOS and others
	// is intended.
	# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101300) \|\| \
	(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 120000) \|\| \
	(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 120000) \|\| \
	(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000)
	# define _LIBCPP_AVAILABILITY_HAS_NO_BAD_OPTIONAL_ACCESS
	# define _LIBCPP_AVAILABILITY_HAS_NO_BAD_VARIANT_ACCESS
	# define _LIBCPP_AVAILABILITY_HAS_NO_BAD_ANY_CAST
	# endif
	# define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS \
	__attribute__((availability(macos,strict,introduced=10.13))) \
	__attribute__((availability(ios,strict,introduced=12.0))) \
	__attribute__((availability(tvos,strict,introduced=12.0))) \
	__attribute__((availability(watchos,strict,introduced=5.0)))
	# define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS \
	_LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
	# define _LIBCPP_AVAILABILITY_BAD_ANY_CAST \
	_LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS

	// uncaught_exceptions
	# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101200) \|\| \
	(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 100000) \|\| \
	(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 100000) \|\| \
	(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 30000)
	# define _LIBCPP_AVAILABILITY_HAS_NO_UNCAUGHT_EXCEPTIONS
	# endif
	# define _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS \
	__attribute__((availability(macos,strict,introduced=10.12))) \
	__attribute__((availability(ios,strict,introduced=10.0))) \
	__attribute__((availability(tvos,strict,introduced=10.0))) \
	__attribute__((availability(watchos,strict,introduced=3.0)))

	// sized operator new and sized operator delete
	# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101200) \|\| \
	(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 100000) \|\| \
	(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 100000) \|\| \
	(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 30000)
	# define _LIBCPP_AVAILABILITY_HAS_NO_SIZED_NEW_DELETE
	# endif
	# define _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE \
	__attribute__((availability(macos,strict,introduced=10.12))) \
	__attribute__((availability(ios,strict,introduced=10.0))) \
	__attribute__((availability(tvos,strict,introduced=10.0))) \
	__attribute__((availability(watchos,strict,introduced=3.0)))

	// future_error
	# if (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 60000)
	# define _LIBCPP_AVAILABILITY_HAS_NO_FUTURE_ERROR
	# endif
	# define _LIBCPP_AVAILABILITY_FUTURE_ERROR \
	__attribute__((availability(ios,strict,introduced=6.0)))

	// type_info's vtable
	# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 100900) \|\| \
	(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 70000)
	# define _LIBCPP_AVAILABILITY_HAS_NO_TYPEINFO_VTABLE
	# endif
	# define _LIBCPP_AVAILABILITY_TYPEINFO_VTABLE \
	__attribute__((availability(macos,strict,introduced=10.9))) \
	__attribute__((availability(ios,strict,introduced=7.0)))

	// locale::category
	# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 100900) \|\| \
	(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 70000)
	# define _LIBCPP_AVAILABILITY_HAS_NO_LOCALE_CATEGORY
	# endif
	# define _LIBCPP_AVAILABILITY_LOCALE_CATEGORY \
	__attribute__((availability(macos,strict,introduced=10.9))) \
	__attribute__((availability(ios,strict,introduced=7.0)))

	// atomic operations on shared_ptr
	# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 100900) \|\| \
	(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 70000)
	# define _LIBCPP_AVAILABILITY_HAS_NO_ATOMIC_SHARED_PTR
	# endif
	# define _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR \
	__attribute__((availability(macos,strict,introduced=10.9))) \
	__attribute__((availability(ios,strict,introduced=7.0)))

	// <filesystem>
	# 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) \|\| \
	(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 130000) \|\| \
	(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 60000)
	# define _LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM
	# endif
	# define _LIBCPP_AVAILABILITY_FILESYSTEM \
	__attribute__((availability(macos,strict,introduced=10.15))) \
	__attribute__((availability(ios,strict,introduced=13.0))) \
	__attribute__((availability(tvos,strict,introduced=13.0))) \
	__attribute__((availability(watchos,strict,introduced=6.0)))
	# define _LIBCPP_AVAILABILITY_FILESYSTEM_PUSH \
	_Pragma("clang attribute push(__attribute__((availability(macos,strict,introduced=10.15))), apply_to=any(function,record))") \
	_Pragma("clang attribute push(__attribute__((availability(ios,strict,introduced=13.0))), apply_to=any(function,record))") \
	_Pragma("clang attribute push(__attribute__((availability(tvos,strict,introduced=13.0))), apply_to=any(function,record))") \
	_Pragma("clang attribute push(__attribute__((availability(watchos,strict,introduced=6.0))), apply_to=any(function,record))")
	# define _LIBCPP_AVAILABILITY_FILESYSTEM_POP \
	_Pragma("clang attribute pop") \
	_Pragma("clang attribute pop") \
	_Pragma("clang attribute pop") \
	_Pragma("clang attribute pop")

	// std::to_chars(floating-point)
	# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 130300) \|\| \
	(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 160300) \|\| \
	(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 160300) \|\| \
	(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 90300)
	# define _LIBCPP_AVAILABILITY_HAS_NO_TO_CHARS_FLOATING_POINT
	# endif
	# define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT \
	__attribute__((availability(macos,strict,introduced=13.3))) \
	__attribute__((availability(ios,strict,introduced=16.3))) \
	__attribute__((availability(tvos,strict,introduced=16.3))) \
	__attribute__((availability(watchos,strict,introduced=9.3)))

	// c++20 synchronization library
	# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 110000) \|\| \
	(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 140000) \|\| \
	(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 140000) \|\| \
	(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 70000)
	# define _LIBCPP_AVAILABILITY_HAS_NO_SYNC
	# endif
	# define _LIBCPP_AVAILABILITY_SYNC \
	__attribute__((availability(macos,strict,introduced=11.0))) \
	__attribute__((availability(ios,strict,introduced=14.0))) \
	__attribute__((availability(tvos,strict,introduced=14.0))) \
	__attribute__((availability(watchos,strict,introduced=7.0)))

	// __libcpp_verbose_abort
	# if 1 // TODO: Update once this is released
	# define _LIBCPP_AVAILABILITY_HAS_NO_VERBOSE_ABORT
	# endif
	# define _LIBCPP_AVAILABILITY_VERBOSE_ABORT \
	__attribute__((unavailable))

	#else

	// ...New vendors can add availability markup here...

	# error "It looks like you're trying to enable vendor availability markup, but you haven't defined the corresponding macros yet!"

	#endif

	// Define availability attributes that depend on _LIBCPP_HAS_NO_EXCEPTIONS.
	// Those are defined in terms of the availability attributes above, and
	// should not be vendor-specific.
	#if defined(_LIBCPP_HAS_NO_EXCEPTIONS)
	# define _LIBCPP_AVAILABILITY_FUTURE
	# define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
	# define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS
	# define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS
	#else
	# define _LIBCPP_AVAILABILITY_FUTURE _LIBCPP_AVAILABILITY_FUTURE_ERROR
	# define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST _LIBCPP_AVAILABILITY_BAD_ANY_CAST
	# define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
	# define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS
	#endif

	#endif // _LIBCPP___AVAILABILITY