[libc++] Granularize __tuple

[philnik]

• Generate files

[philnik]

• Try to fix CI

[philnik]

• Try to fix CI

[philnik]

Rebased

[philnik]

• Next try

[philnik]

• Another try

[philnik]

• Another try

[ronlieb]

seeing buildbot failures on hip, not sure if this patch caused it

https://lab.llvm.org/buildbot/#/builders/165/builds/24486

[philnik]

In D133081#3770543, @ronlieb wrote:

seeing buildbot failures on hip, not sure if this patch caused it

https://lab.llvm.org/buildbot/#/builders/165/builds/24486

Yes, this patch caused the failure. You have to clear your build directory.

[mgorny]

Replacing a file with a directory (and the other way arond) is problematic in general. E.g. if you attempt to ninja install it on top of the existing installation:

CMake Error at libcxx/include/cmake_install.cmake:2190 (file):
  file INSTALL destination: /tmp/z/usr/local/include/c++/v1/__tuple is not a
  directory.
Call Stack (most recent call first):
  libcxx/cmake_install.cmake:47 (include)
  cmake_install.cmake:48 (include)

While this is normally not a problem for distributions since we use a staging area (i.e. DESTDIR), Gentoo's package manager does not support cleanly performing the opposite, i.e. replacing the (non-empty at time of install) directory back with the file on downgrade.

Could we please rename __tuple now to avoid name clash and the problems caused by it?

libcxx/include/CMakeLists.txt

set(files
   __functional/pointer_to_binary_function.h
   __functional/pointer_to_unary_function.h
   __functional/ranges_operations.h
   __functional/reference_wrapper.h
   __functional/unary_function.h
   __functional/unary_negate.h
   __functional/unwrap_ref.h
   __functional/weak_result_type.h
+  __fwd/array.h
+  __fwd/get.h
   __fwd/hash.h
   __fwd/pair.h
   __fwd/span.h
   __fwd/string_view.h
+  __fwd/tuple.h
   __hash_table
   __ios/fpos.h
   __iterator/access.h
   __iterator/advance.h
   __iterator/back_insert_iterator.h
   __iterator/bounded_iter.h
   __iterator/common_iterator.h
   __iterator/concepts.h
set(files
   __support/win32/locale_win32.h
   __support/xlocale/__nop_locale_mgmt.h
   __support/xlocale/__posix_l_fallback.h
   __support/xlocale/__strtonum_fallback.h
   __thread/poll_with_backoff.h
   __thread/timed_backoff_policy.h
   __threading_support
   __tree
-  __tuple
+  __tuple/apply_cv.h
+  __tuple/make_tuple_types.h
+  __tuple/sfinae_helpers.h
+  __tuple/tuple_element.h
+  __tuple/tuple_indices.h
+  __tuple/tuple_like.h
+  __tuple/tuple_size.h
+  __tuple/tuple_types.h
   __type_traits/add_const.h
   __type_traits/add_cv.h
   __type_traits/add_lvalue_reference.h
   __type_traits/add_pointer.h
   __type_traits/add_rvalue_reference.h
   __type_traits/add_volatile.h
   __type_traits/aligned_storage.h
   __type_traits/aligned_union.h

libcxx/include/__functional/hash.h

 //===----------------------------------------------------------------------===//
 //
 // 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___FUNCTIONAL_HASH_H
 #define _LIBCPP___FUNCTIONAL_HASH_H
 
 #include <__config>
 #include <__functional/unary_function.h>
 #include <__fwd/hash.h>
-#include <__tuple>
+#include <__tuple/sfinae_helpers.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
 #include <__utility/swap.h>
 #include <cstddef>
 #include <cstdint>
 #include <cstring>
 #include <limits>

libcxx/include/__fwd/array.h

+//===---------------------------------------------------------------------===//
+//
+// 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___FWD_ARRAY_H
+#define _LIBCPP___FWD_ARRAY_H
+
+#include <__config>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp, size_t _Size>
+struct _LIBCPP_TEMPLATE_VIS array;
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___FWD_ARRAY_H

libcxx/include/__fwd/get.h

+//===----------------------------------------------------------------------===//
+//
+// 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___FWD_GET_H
+#define _LIBCPP___FWD_GET_H
+
+#include <__config>
+#include <__fwd/array.h>
+#include <__fwd/pair.h>
+#include <__fwd/tuple.h>
+#include <__tuple/tuple_element.h>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#ifndef _LIBCPP_CXX03_LANG
+
+template <size_t _Ip, class ..._Tp>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+typename tuple_element<_Ip, tuple<_Tp...> >::type&
+get(tuple<_Tp...>&) _NOEXCEPT;
+
+template <size_t _Ip, class ..._Tp>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+const typename tuple_element<_Ip, tuple<_Tp...> >::type&
+get(const tuple<_Tp...>&) _NOEXCEPT;
+
+template <size_t _Ip, class ..._Tp>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+typename tuple_element<_Ip, tuple<_Tp...> >::type&&
+get(tuple<_Tp...>&&) _NOEXCEPT;
+
+template <size_t _Ip, class ..._Tp>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
+get(const tuple<_Tp...>&&) _NOEXCEPT;
+
+#endif //_LIBCPP_CXX03_LANG
+
+template <size_t _Ip, class _T1, class _T2>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+typename tuple_element<_Ip, pair<_T1, _T2> >::type&
+get(pair<_T1, _T2>&) _NOEXCEPT;
+
+template <size_t _Ip, class _T1, class _T2>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
+get(const pair<_T1, _T2>&) _NOEXCEPT;
+
+#ifndef _LIBCPP_CXX03_LANG
+template <size_t _Ip, class _T1, class _T2>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
+get(pair<_T1, _T2>&&) _NOEXCEPT;
+
+template <size_t _Ip, class _T1, class _T2>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
+get(const pair<_T1, _T2>&&) _NOEXCEPT;
+#endif
+
+template <size_t _Ip, class _Tp, size_t _Size>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+_Tp&
+get(array<_Tp, _Size>&) _NOEXCEPT;
+
+template <size_t _Ip, class _Tp, size_t _Size>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+const _Tp&
+get(const array<_Tp, _Size>&) _NOEXCEPT;
+
+#ifndef _LIBCPP_CXX03_LANG
+template <size_t _Ip, class _Tp, size_t _Size>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+_Tp&&
+get(array<_Tp, _Size>&&) _NOEXCEPT;
+
+template <size_t _Ip, class _Tp, size_t _Size>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
+const _Tp&&
+get(const array<_Tp, _Size>&&) _NOEXCEPT;
+#endif
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___FWD_GET_H

libcxx/include/__fwd/tuple.h

+//===---------------------------------------------------------------------===//
+//
+// 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___FWD_TUPLE_H
+#define _LIBCPP___FWD_TUPLE_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#ifndef _LIBCPP_CXX03_LANG
+
+template <class...>
+class _LIBCPP_TEMPLATE_VIS tuple;
+
+#endif // _LIBCPP_CXX03_LANG
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___FWD_TUPLE_H

libcxx/include/__ranges/subrange.h

 
 #include <__assert>
 #include <__concepts/constructible.h>
 #include <__concepts/convertible_to.h>
 #include <__concepts/copyable.h>
 #include <__concepts/derived_from.h>
 #include <__concepts/different_from.h>
 #include <__config>
+#include <__fwd/get.h>
 #include <__iterator/advance.h>
 #include <__iterator/concepts.h>
 #include <__iterator/incrementable_traits.h>
 #include <__iterator/iterator_traits.h>
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
 #include <__ranges/dangling.h>
 #include <__ranges/enable_borrowed_range.h>
 #include <__ranges/size.h>
 #include <__ranges/view_interface.h>
-#include <__tuple>
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_size.h>
 #include <__utility/move.h>
 #include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD

libcxx/include/__tuple

-// -*- 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___TUPLE
-#define _LIBCPP___TUPLE
-
-#include <__config>
-#include <__fwd/pair.h>
-#include <cstddef>
-#include <type_traits>
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#  pragma GCC system_header
-#endif
-
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size;
-
-#if !defined(_LIBCPP_CXX03_LANG)
-template <class _Tp, class...>
-using __enable_if_tuple_size_imp = _Tp;
-
-template <class _Tp>
-struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
-    const _Tp,
-    __enable_if_t<!is_volatile<_Tp>::value>,
-    integral_constant<size_t, sizeof(tuple_size<_Tp>)>>>
-    : public integral_constant<size_t, tuple_size<_Tp>::value> {};
-
-template <class _Tp>
-struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
-    volatile _Tp,
-    __enable_if_t<!is_const<_Tp>::value>,
-    integral_constant<size_t, sizeof(tuple_size<_Tp>)>>>
-    : public integral_constant<size_t, tuple_size<_Tp>::value> {};
-
-template <class _Tp>
-struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
-    const volatile _Tp,
-    integral_constant<size_t, sizeof(tuple_size<_Tp>)>>>
-    : public integral_constant<size_t, tuple_size<_Tp>::value> {};
-
-#else
-template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<const _Tp> : public tuple_size<_Tp> {};
-template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<volatile _Tp> : public tuple_size<_Tp> {};
-template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<const volatile _Tp> : public tuple_size<_Tp> {};
-#endif
-
-template <size_t _Ip, class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_element;
-
-template <size_t _Ip, class _Tp>
-struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const _Tp>
-{
-    typedef _LIBCPP_NODEBUG typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
-};
-
-template <size_t _Ip, class _Tp>
-struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, volatile _Tp>
-{
-    typedef _LIBCPP_NODEBUG typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
-};
-
-template <size_t _Ip, class _Tp>
-struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const volatile _Tp>
-{
-    typedef _LIBCPP_NODEBUG typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
-};
-
-template <class _Tp> struct __tuple_like : false_type {};
-
-template <class _Tp> struct __tuple_like<const _Tp> : public __tuple_like<_Tp> {};
-template <class _Tp> struct __tuple_like<volatile _Tp> : public __tuple_like<_Tp> {};
-template <class _Tp> struct __tuple_like<const volatile _Tp> : public __tuple_like<_Tp> {};
-
-// tuple specializations
-
-#ifndef _LIBCPP_CXX03_LANG
-
-template <size_t...> struct __tuple_indices {};
-
-template <class _IdxType, _IdxType... _Values>
-struct __integer_sequence {
-  template <template <class _OIdxType, _OIdxType...> class _ToIndexSeq, class _ToIndexType>
-  using __convert = _ToIndexSeq<_ToIndexType, _Values...>;
-
-  template <size_t _Sp>
-  using __to_tuple_indices = __tuple_indices<(_Values + _Sp)...>;
-};
-
-#if !__has_builtin(__make_integer_seq) || defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
-namespace __detail {
-
-template<typename _Tp, size_t ..._Extra> struct __repeat;
-template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<__integer_sequence<_Tp, _Np...>, _Extra...> {
-  typedef _LIBCPP_NODEBUG __integer_sequence<_Tp,
-                           _Np...,
-                           sizeof...(_Np) + _Np...,
-                           2 * sizeof...(_Np) + _Np...,
-                           3 * sizeof...(_Np) + _Np...,
-                           4 * sizeof...(_Np) + _Np...,
-                           5 * sizeof...(_Np) + _Np...,
-                           6 * sizeof...(_Np) + _Np...,
-                           7 * sizeof...(_Np) + _Np...,
-                           _Extra...> type;
-};
-
-template<size_t _Np> struct __parity;
-template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {};
-
-template<> struct __make<0> { typedef __integer_sequence<size_t> type; };
-template<> struct __make<1> { typedef __integer_sequence<size_t, 0> type; };
-template<> struct __make<2> { typedef __integer_sequence<size_t, 0, 1> type; };
-template<> struct __make<3> { typedef __integer_sequence<size_t, 0, 1, 2> type; };
-template<> struct __make<4> { typedef __integer_sequence<size_t, 0, 1, 2, 3> type; };
-template<> struct __make<5> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4> type; };
-template<> struct __make<6> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; };
-template<> struct __make<7> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; };
-
-template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; };
-template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; };
-template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; };
-template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; };
-template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
-template<> struct __parity<5> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
-template<> struct __parity<6> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
-template<> struct __parity<7> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 7, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
-
-} // namespace detail
-
-#endif // !__has_builtin(__make_integer_seq) || defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
-
-#if __has_builtin(__make_integer_seq)
-template <size_t _Ep, size_t _Sp>
-using __make_indices_imp =
-    typename __make_integer_seq<__integer_sequence, size_t, _Ep - _Sp>::template
-    __to_tuple_indices<_Sp>;
-#else
-template <size_t _Ep, size_t _Sp>
-using __make_indices_imp =
-    typename __detail::__make<_Ep - _Sp>::type::template __to_tuple_indices<_Sp>;
-
-#endif
-
-template <size_t _Ep, size_t _Sp = 0>
-struct __make_tuple_indices
-{
-    static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
-    typedef __make_indices_imp<_Ep, _Sp> type;
-};
-
-
-template <class ..._Tp> class _LIBCPP_TEMPLATE_VIS tuple;
-
-template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};
-
-template <class ..._Tp>
-struct _LIBCPP_TEMPLATE_VIS tuple_size<tuple<_Tp...> >
-    : public integral_constant<size_t, sizeof...(_Tp)>
-{
-};
-
-template <size_t _Ip, class ..._Tp>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-typename tuple_element<_Ip, tuple<_Tp...> >::type&
-get(tuple<_Tp...>&) _NOEXCEPT;
-
-template <size_t _Ip, class ..._Tp>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-const typename tuple_element<_Ip, tuple<_Tp...> >::type&
-get(const tuple<_Tp...>&) _NOEXCEPT;
-
-template <size_t _Ip, class ..._Tp>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-typename tuple_element<_Ip, tuple<_Tp...> >::type&&
-get(tuple<_Tp...>&&) _NOEXCEPT;
-
-template <size_t _Ip, class ..._Tp>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
-get(const tuple<_Tp...>&&) _NOEXCEPT;
-
-#endif // !defined(_LIBCPP_CXX03_LANG)
-
-// pair specializations
-
-template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {};
-
-template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-typename tuple_element<_Ip, pair<_T1, _T2> >::type&
-get(pair<_T1, _T2>&) _NOEXCEPT;
-
-template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
-get(const pair<_T1, _T2>&) _NOEXCEPT;
-
-#ifndef _LIBCPP_CXX03_LANG
-template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
-get(pair<_T1, _T2>&&) _NOEXCEPT;
-
-template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
-get(const pair<_T1, _T2>&&) _NOEXCEPT;
-#endif
-
-// array specializations
-
-template <class _Tp, size_t _Size> struct _LIBCPP_TEMPLATE_VIS array;
-
-template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};
-
-template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-_Tp&
-get(array<_Tp, _Size>&) _NOEXCEPT;
-
-template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-const _Tp&
-get(const array<_Tp, _Size>&) _NOEXCEPT;
-
-#ifndef _LIBCPP_CXX03_LANG
-template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-_Tp&&
-get(array<_Tp, _Size>&&) _NOEXCEPT;
-
-template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-const _Tp&&
-get(const array<_Tp, _Size>&&) _NOEXCEPT;
-#endif
-
-#ifndef _LIBCPP_CXX03_LANG
-
-// __tuple_types
-
-template <class ..._Tp> struct __tuple_types {};
-
-#if !__has_builtin(__type_pack_element)
-
-namespace __indexer_detail {
-
-template <size_t _Idx, class _Tp>
-struct __indexed { using type _LIBCPP_NODEBUG = _Tp; };
-
-template <class _Types, class _Indexes> struct __indexer;
-
-template <class ..._Types, size_t ..._Idx>
-struct __indexer<__tuple_types<_Types...>, __tuple_indices<_Idx...>>
-    : __indexed<_Idx, _Types>...
-{};
-
-template <size_t _Idx, class _Tp>
-__indexed<_Idx, _Tp> __at_index(__indexed<_Idx, _Tp> const&);
-
-} // namespace __indexer_detail
-
-template <size_t _Idx, class ..._Types>
-using __type_pack_element _LIBCPP_NODEBUG = typename decltype(
-    __indexer_detail::__at_index<_Idx>(
-        __indexer_detail::__indexer<
-            __tuple_types<_Types...>,
-            typename __make_tuple_indices<sizeof...(_Types)>::type
-        >{})
-  )::type;
-#endif
-
-template <size_t _Ip, class ..._Types>
-struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, __tuple_types<_Types...> >
-{
-    static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range");
-    typedef _LIBCPP_NODEBUG __type_pack_element<_Ip, _Types...> type;
-};
-
-
-template <class ..._Tp>
-struct _LIBCPP_TEMPLATE_VIS tuple_size<__tuple_types<_Tp...> >
-    : public integral_constant<size_t, sizeof...(_Tp)>
-{
-};
-
-template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};
-
-template <bool _ApplyLV, bool _ApplyConst, bool _ApplyVolatile>
-struct __apply_cv_mf;
-template <>
-struct __apply_cv_mf<false, false, false> {
-  template <class _Tp> using __apply = _Tp;
-};
-template <>
-struct __apply_cv_mf<false, true, false> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG = const _Tp;
-};
-template <>
-struct __apply_cv_mf<false, false, true> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG = volatile _Tp;
-};
-template <>
-struct __apply_cv_mf<false, true, true> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG = const volatile _Tp;
-};
-template <>
-struct __apply_cv_mf<true, false, false> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG = _Tp&;
-};
-template <>
-struct __apply_cv_mf<true, true, false> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG = const _Tp&;
-};
-template <>
-struct __apply_cv_mf<true, false, true> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG = volatile _Tp&;
-};
-template <>
-struct __apply_cv_mf<true, true, true> {
-  template <class _Tp> using __apply _LIBCPP_NODEBUG = const volatile _Tp&;
-};
-template <class _Tp, class _RawTp = typename remove_reference<_Tp>::type>
-using __apply_cv_t _LIBCPP_NODEBUG = __apply_cv_mf<
-    is_lvalue_reference<_Tp>::value,
-    is_const<_RawTp>::value,
-    is_volatile<_RawTp>::value>;
-
-// __make_tuple_types
-
-// __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
-// __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
-// _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>.  If _Tuple is a
-// lvalue_reference type, then __tuple_types<_Types&...> is the result.
-
-template <class _TupleTypes, class _TupleIndices>
-struct __make_tuple_types_flat;
-
-template <template <class...> class _Tuple, class ..._Types, size_t ..._Idx>
-struct __make_tuple_types_flat<_Tuple<_Types...>, __tuple_indices<_Idx...>> {
-  // Specialization for pair, tuple, and __tuple_types
-  template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
-  using __apply_quals _LIBCPP_NODEBUG = __tuple_types<
-      typename _ApplyFn::template __apply<__type_pack_element<_Idx, _Types...>>...
-    >;
-};
-
-template <class _Vt, size_t _Np, size_t ..._Idx>
-struct __make_tuple_types_flat<array<_Vt, _Np>, __tuple_indices<_Idx...>> {
-  template <size_t>
-  using __value_type = _Vt;
-  template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
-  using __apply_quals = __tuple_types<
-      typename _ApplyFn::template __apply<__value_type<_Idx>>...
-    >;
-};
-
-template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value,
-          size_t _Sp = 0,
-          bool _SameSize = (_Ep == tuple_size<typename remove_reference<_Tp>::type>::value)>
-struct __make_tuple_types
-{
-    static_assert(_Sp <= _Ep, "__make_tuple_types input error");
-    using _RawTp = typename remove_cv<typename remove_reference<_Tp>::type>::type;
-    using _Maker = __make_tuple_types_flat<_RawTp, typename __make_tuple_indices<_Ep, _Sp>::type>;
-    using type = typename _Maker::template __apply_quals<_Tp>;
-};
-
-template <class ..._Types, size_t _Ep>
-struct __make_tuple_types<tuple<_Types...>, _Ep, 0, true> {
-  typedef _LIBCPP_NODEBUG __tuple_types<_Types...> type;
-};
-
-template <class ..._Types, size_t _Ep>
-struct __make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true> {
-  typedef _LIBCPP_NODEBUG __tuple_types<_Types...> type;
-};
-
-template <bool ..._Preds>
-struct __all_dummy;
-
-template <bool ..._Pred>
-struct __all : _IsSame<__all_dummy<_Pred...>, __all_dummy<((void)_Pred, true)...>> {};
-
-struct __tuple_sfinae_base {
-  template <template <class, class...> class _Trait,
-            class ..._LArgs, class ..._RArgs>
-  static auto __do_test(__tuple_types<_LArgs...>, __tuple_types<_RArgs...>)
-    -> __all<__enable_if_t<_Trait<_LArgs, _RArgs>::value, bool>{true}...>;
-  template <template <class...> class>
-  static auto __do_test(...) -> false_type;
-
-  template <class _FromArgs, class _ToArgs>
-  using __constructible = decltype(__do_test<is_constructible>(_ToArgs{}, _FromArgs{}));
-  template <class _FromArgs, class _ToArgs>
-  using __convertible = decltype(__do_test<is_convertible>(_FromArgs{}, _ToArgs{}));
-  template <class _FromArgs, class _ToArgs>
-  using __assignable = decltype(__do_test<is_assignable>(_ToArgs{}, _FromArgs{}));
-};
-
-// __tuple_convertible
-
-template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
-                                bool = __tuple_like<_Up>::value>
-struct __tuple_convertible
-    : public false_type {};
-
-template <class _Tp, class _Up>
-struct __tuple_convertible<_Tp, _Up, true, true>
-    : public __tuple_sfinae_base::__convertible<
-      typename __make_tuple_types<_Tp>::type
-    , typename __make_tuple_types<_Up>::type
-    >
-{};
-
-// __tuple_constructible
-
-template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
-                                bool = __tuple_like<_Up>::value>
-struct __tuple_constructible
-    : public false_type {};
-
-template <class _Tp, class _Up>
-struct __tuple_constructible<_Tp, _Up, true, true>
-    : public __tuple_sfinae_base::__constructible<
-      typename __make_tuple_types<_Tp>::type
-    , typename __make_tuple_types<_Up>::type
-    >
-{};
-
-// __tuple_assignable
-
-template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
-                                bool = __tuple_like<_Up>::value>
-struct __tuple_assignable
-    : public false_type {};
-
-template <class _Tp, class _Up>
-struct __tuple_assignable<_Tp, _Up, true, true>
-    : public __tuple_sfinae_base::__assignable<
-      typename __make_tuple_types<_Tp>::type
-    , typename __make_tuple_types<_Up&>::type
-    >
-{};
-
-
-template <size_t _Ip, class ..._Tp>
-struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, tuple<_Tp...> >
-{
-    typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type;
-};
-
-#if _LIBCPP_STD_VER > 11
-template <size_t _Ip, class ..._Tp>
-using tuple_element_t _LIBCPP_NODEBUG = typename tuple_element <_Ip, _Tp...>::type;
-#endif
-
-template <bool _IsTuple, class _SizeTrait, size_t _Expected>
-struct __tuple_like_with_size_imp : false_type {};
-
-template <class _SizeTrait, size_t _Expected>
-struct __tuple_like_with_size_imp<true, _SizeTrait, _Expected>
-    : integral_constant<bool, _SizeTrait::value == _Expected> {};
-
-template <class _Tuple, size_t _ExpectedSize, class _RawTuple = __uncvref_t<_Tuple> >
-using __tuple_like_with_size _LIBCPP_NODEBUG = __tuple_like_with_size_imp<
-                                   __tuple_like<_RawTuple>::value,
-                                   tuple_size<_RawTuple>, _ExpectedSize
-                              >;
-
-struct _LIBCPP_TYPE_VIS __check_tuple_constructor_fail {
-
-    static constexpr bool __enable_explicit_default() { return false; }
-    static constexpr bool __enable_implicit_default() { return false; }
-    template <class ...>
-    static constexpr bool __enable_explicit() { return false; }
-    template <class ...>
-    static constexpr bool __enable_implicit() { return false; }
-    template <class ...>
-    static constexpr bool __enable_assign() { return false; }
-};
-#endif // !defined(_LIBCPP_CXX03_LANG)
-
-#if _LIBCPP_STD_VER > 14
-
-template <bool _CanCopy, bool _CanMove>
-struct __sfinae_ctor_base {};
-template <>
-struct __sfinae_ctor_base<false, false> {
-  __sfinae_ctor_base() = default;
-  __sfinae_ctor_base(__sfinae_ctor_base const&) = delete;
-  __sfinae_ctor_base(__sfinae_ctor_base &&) = delete;
-  __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
-  __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
-};
-template <>
-struct __sfinae_ctor_base<true, false> {
-  __sfinae_ctor_base() = default;
-  __sfinae_ctor_base(__sfinae_ctor_base const&) = default;
-  __sfinae_ctor_base(__sfinae_ctor_base &&) = delete;
-  __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
-  __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
-};
-template <>
-struct __sfinae_ctor_base<false, true> {
-  __sfinae_ctor_base() = default;
-  __sfinae_ctor_base(__sfinae_ctor_base const&) = delete;
-  __sfinae_ctor_base(__sfinae_ctor_base &&) = default;
-  __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
-  __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
-};
-
-template <bool _CanCopy, bool _CanMove>
-struct __sfinae_assign_base {};
-template <>
-struct __sfinae_assign_base<false, false> {
-  __sfinae_assign_base() = default;
-  __sfinae_assign_base(__sfinae_assign_base const&) = default;
-  __sfinae_assign_base(__sfinae_assign_base &&) = default;
-  __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
-  __sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete;
-};
-template <>
-struct __sfinae_assign_base<true, false> {
-  __sfinae_assign_base() = default;
-  __sfinae_assign_base(__sfinae_assign_base const&) = default;
-  __sfinae_assign_base(__sfinae_assign_base &&) = default;
-  __sfinae_assign_base& operator=(__sfinae_assign_base const&) = default;
-  __sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete;
-};
-template <>
-struct __sfinae_assign_base<false, true> {
-  __sfinae_assign_base() = default;
-  __sfinae_assign_base(__sfinae_assign_base const&) = default;
-  __sfinae_assign_base(__sfinae_assign_base &&) = default;
-  __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
-  __sfinae_assign_base& operator=(__sfinae_assign_base&&) = default;
-};
-#endif // _LIBCPP_STD_VER > 14
-
-_LIBCPP_END_NAMESPACE_STD
-
-#endif // _LIBCPP___TUPLE

libcxx/include/__tuple/apply_cv.h

+//===----------------------------------------------------------------------===//
+//
+// 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___TUPLE_APPLY_CV_H
+#define _LIBCPP___TUPLE_APPLY_CV_H
+
+#include <__config>
+#include <__type_traits/is_const.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/is_volatile.h>
+#include <__type_traits/remove_reference.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#ifndef _LIBCPP_CXX03_LANG
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <bool _ApplyLV, bool _ApplyConst, bool _ApplyVolatile>
+struct __apply_cv_mf;
+template <>
+struct __apply_cv_mf<false, false, false> {
+  template <class _Tp> using __apply = _Tp;
+};
+template <>
+struct __apply_cv_mf<false, true, false> {
+  template <class _Tp> using __apply _LIBCPP_NODEBUG = const _Tp;
+};
+template <>
+struct __apply_cv_mf<false, false, true> {
+  template <class _Tp> using __apply _LIBCPP_NODEBUG = volatile _Tp;
+};
+template <>
+struct __apply_cv_mf<false, true, true> {
+  template <class _Tp> using __apply _LIBCPP_NODEBUG = const volatile _Tp;
+};
+template <>
+struct __apply_cv_mf<true, false, false> {
+  template <class _Tp> using __apply _LIBCPP_NODEBUG = _Tp&;
+};
+template <>
+struct __apply_cv_mf<true, true, false> {
+  template <class _Tp> using __apply _LIBCPP_NODEBUG = const _Tp&;
+};
+template <>
+struct __apply_cv_mf<true, false, true> {
+  template <class _Tp> using __apply _LIBCPP_NODEBUG = volatile _Tp&;
+};
+template <>
+struct __apply_cv_mf<true, true, true> {
+  template <class _Tp> using __apply _LIBCPP_NODEBUG = const volatile _Tp&;
+};
+template <class _Tp, class _RawTp = typename remove_reference<_Tp>::type>
+using __apply_cv_t _LIBCPP_NODEBUG = __apply_cv_mf<
+    is_lvalue_reference<_Tp>::value,
+    is_const<_RawTp>::value,
+    is_volatile<_RawTp>::value>;
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_CXX03_LANG
+
+#endif // _LIBCPP___TUPLE_APPLY_CV_H

libcxx/include/__tuple/make_tuple_types.h

+//===----------------------------------------------------------------------===//
+//
+// 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___TUPLE_MAKE_TUPLE_TYPES_H
+#define _LIBCPP___TUPLE_MAKE_TUPLE_TYPES_H
+
+#include <__config>
+#include <__fwd/array.h>
+#include <__fwd/tuple.h>
+#include <__tuple/apply_cv.h>
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_indices.h>
+#include <__tuple/tuple_size.h>
+#include <__tuple/tuple_types.h>
+#include <__type_traits/remove_cv.h>
+#include <__type_traits/remove_reference.h>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#ifndef _LIBCPP_CXX03_LANG
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+// __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
+// __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
+// _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>.  If _Tuple is a
+// lvalue_reference type, then __tuple_types<_Types&...> is the result.
+
+template <class _TupleTypes, class _TupleIndices>
+struct __make_tuple_types_flat;
+
+template <template <class...> class _Tuple, class ..._Types, size_t ..._Idx>
+struct __make_tuple_types_flat<_Tuple<_Types...>, __tuple_indices<_Idx...>> {
+  // Specialization for pair, tuple, and __tuple_types
+  template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
+  using __apply_quals _LIBCPP_NODEBUG = __tuple_types<
+      typename _ApplyFn::template __apply<__type_pack_element<_Idx, _Types...>>...
+    >;
+};
+
+template <class _Vt, size_t _Np, size_t ..._Idx>
+struct __make_tuple_types_flat<array<_Vt, _Np>, __tuple_indices<_Idx...>> {
+  template <size_t>
+  using __value_type = _Vt;
+  template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
+  using __apply_quals = __tuple_types<
+      typename _ApplyFn::template __apply<__value_type<_Idx>>...
+    >;
+};
+
+template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value,
+          size_t _Sp = 0,
+          bool _SameSize = (_Ep == tuple_size<typename remove_reference<_Tp>::type>::value)>
+struct __make_tuple_types
+{
+    static_assert(_Sp <= _Ep, "__make_tuple_types input error");
+    using _RawTp = typename remove_cv<typename remove_reference<_Tp>::type>::type;
+    using _Maker = __make_tuple_types_flat<_RawTp, typename __make_tuple_indices<_Ep, _Sp>::type>;
+    using type = typename _Maker::template __apply_quals<_Tp>;
+};
+
+template <class ..._Types, size_t _Ep>
+struct __make_tuple_types<tuple<_Types...>, _Ep, 0, true> {
+  typedef _LIBCPP_NODEBUG __tuple_types<_Types...> type;
+};
+
+template <class ..._Types, size_t _Ep>
+struct __make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true> {
+  typedef _LIBCPP_NODEBUG __tuple_types<_Types...> type;
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_CXX03_LANG
+
+#endif // _LIBCPP___TUPLE_MAKE_TUPLE_TYPES_H

libcxx/include/__tuple/sfinae_helpers.h

+//===----------------------------------------------------------------------===//
+//
+// 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___TUPLE_SFINAE_HELPERS_H
+#define _LIBCPP___TUPLE_SFINAE_HELPERS_H
+
+#include <__config>
+#include <__fwd/tuple.h>
+#include <__tuple/make_tuple_types.h>
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_like.h>
+#include <__tuple/tuple_size.h>
+#include <__tuple/tuple_types.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_assignable.h>
+#include <__type_traits/is_constructible.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/remove_cvref.h>
+#include <__type_traits/remove_reference.h>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#ifndef _LIBCPP_CXX03_LANG
+
+template <bool ..._Preds>
+struct __all_dummy;
+
+template <bool ..._Pred>
+struct __all : _IsSame<__all_dummy<_Pred...>, __all_dummy<((void)_Pred, true)...>> {};
+
+struct __tuple_sfinae_base {
+  template <template <class, class...> class _Trait,
+            class ..._LArgs, class ..._RArgs>
+  static auto __do_test(__tuple_types<_LArgs...>, __tuple_types<_RArgs...>)
+    -> __all<__enable_if_t<_Trait<_LArgs, _RArgs>::value, bool>{true}...>;
+  template <template <class...> class>
+  static auto __do_test(...) -> false_type;
+
+  template <class _FromArgs, class _ToArgs>
+  using __constructible = decltype(__do_test<is_constructible>(_ToArgs{}, _FromArgs{}));
+  template <class _FromArgs, class _ToArgs>
+  using __convertible = decltype(__do_test<is_convertible>(_FromArgs{}, _ToArgs{}));
+  template <class _FromArgs, class _ToArgs>
+  using __assignable = decltype(__do_test<is_assignable>(_ToArgs{}, _FromArgs{}));
+};
+
+// __tuple_convertible
+
+template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
+                                bool = __tuple_like<_Up>::value>
+struct __tuple_convertible
+    : public false_type {};
+
+template <class _Tp, class _Up>
+struct __tuple_convertible<_Tp, _Up, true, true>
+    : public __tuple_sfinae_base::__convertible<
+      typename __make_tuple_types<_Tp>::type
+    , typename __make_tuple_types<_Up>::type
+    >
+{};
+
+// __tuple_constructible
+
+template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
+                                bool = __tuple_like<_Up>::value>
+struct __tuple_constructible
+    : public false_type {};
+
+template <class _Tp, class _Up>
+struct __tuple_constructible<_Tp, _Up, true, true>
+    : public __tuple_sfinae_base::__constructible<
+      typename __make_tuple_types<_Tp>::type
+    , typename __make_tuple_types<_Up>::type
+    >
+{};
+
+// __tuple_assignable
+
+template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
+                                bool = __tuple_like<_Up>::value>
+struct __tuple_assignable
+    : public false_type {};
+
+template <class _Tp, class _Up>
+struct __tuple_assignable<_Tp, _Up, true, true>
+    : public __tuple_sfinae_base::__assignable<
+      typename __make_tuple_types<_Tp>::type
+    , typename __make_tuple_types<_Up&>::type
+    >
+{};
+
+
+template <size_t _Ip, class ..._Tp>
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, tuple<_Tp...> >
+{
+    typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type;
+};
+
+template <bool _IsTuple, class _SizeTrait, size_t _Expected>
+struct __tuple_like_with_size_imp : false_type {};
+
+template <class _SizeTrait, size_t _Expected>
+struct __tuple_like_with_size_imp<true, _SizeTrait, _Expected>
+    : integral_constant<bool, _SizeTrait::value == _Expected> {};
+
+template <class _Tuple, size_t _ExpectedSize, class _RawTuple = __uncvref_t<_Tuple> >
+using __tuple_like_with_size _LIBCPP_NODEBUG = __tuple_like_with_size_imp<
+                                   __tuple_like<_RawTuple>::value,
+                                   tuple_size<_RawTuple>, _ExpectedSize
+                              >;
+
+struct _LIBCPP_TYPE_VIS __check_tuple_constructor_fail {
+
+    static constexpr bool __enable_explicit_default() { return false; }
+    static constexpr bool __enable_implicit_default() { return false; }
+    template <class ...>
+    static constexpr bool __enable_explicit() { return false; }
+    template <class ...>
+    static constexpr bool __enable_implicit() { return false; }
+    template <class ...>
+    static constexpr bool __enable_assign() { return false; }
+};
+#endif // !defined(_LIBCPP_CXX03_LANG)
+
+#if _LIBCPP_STD_VER > 14
+
+template <bool _CanCopy, bool _CanMove>
+struct __sfinae_ctor_base {};
+template <>
+struct __sfinae_ctor_base<false, false> {
+  __sfinae_ctor_base() = default;
+  __sfinae_ctor_base(__sfinae_ctor_base const&) = delete;
+  __sfinae_ctor_base(__sfinae_ctor_base &&) = delete;
+  __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
+  __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
+};
+template <>
+struct __sfinae_ctor_base<true, false> {
+  __sfinae_ctor_base() = default;
+  __sfinae_ctor_base(__sfinae_ctor_base const&) = default;
+  __sfinae_ctor_base(__sfinae_ctor_base &&) = delete;
+  __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
+  __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
+};
+template <>
+struct __sfinae_ctor_base<false, true> {
+  __sfinae_ctor_base() = default;
+  __sfinae_ctor_base(__sfinae_ctor_base const&) = delete;
+  __sfinae_ctor_base(__sfinae_ctor_base &&) = default;
+  __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
+  __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
+};
+
+template <bool _CanCopy, bool _CanMove>
+struct __sfinae_assign_base {};
+template <>
+struct __sfinae_assign_base<false, false> {
+  __sfinae_assign_base() = default;
+  __sfinae_assign_base(__sfinae_assign_base const&) = default;
+  __sfinae_assign_base(__sfinae_assign_base &&) = default;
+  __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
+  __sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete;
+};
+template <>
+struct __sfinae_assign_base<true, false> {
+  __sfinae_assign_base() = default;
+  __sfinae_assign_base(__sfinae_assign_base const&) = default;
+  __sfinae_assign_base(__sfinae_assign_base &&) = default;
+  __sfinae_assign_base& operator=(__sfinae_assign_base const&) = default;
+  __sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete;
+};
+template <>
+struct __sfinae_assign_base<false, true> {
+  __sfinae_assign_base() = default;
+  __sfinae_assign_base(__sfinae_assign_base const&) = default;
+  __sfinae_assign_base(__sfinae_assign_base &&) = default;
+  __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
+  __sfinae_assign_base& operator=(__sfinae_assign_base&&) = default;
+};
+#endif // _LIBCPP_STD_VER > 14
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___TUPLE_SFINAE_HELPERS_H

libcxx/include/__tuple/tuple_element.h

+//===----------------------------------------------------------------------===//
+//
+// 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___TUPLE_TUPLE_ELEMENT_H
+#define _LIBCPP___TUPLE_TUPLE_ELEMENT_H
+
+#include <__config>
+#include <__tuple/tuple_indices.h>
+#include <__tuple/tuple_types.h>
+#include <__type_traits/add_const.h>
+#include <__type_traits/add_cv.h>
+#include <__type_traits/add_volatile.h>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <size_t _Ip, class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_element;
+
+template <size_t _Ip, class _Tp>
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const _Tp>
+{
+    typedef _LIBCPP_NODEBUG typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
+};
+
+template <size_t _Ip, class _Tp>
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, volatile _Tp>
+{
+    typedef _LIBCPP_NODEBUG typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
+};
+
+template <size_t _Ip, class _Tp>
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const volatile _Tp>
+{
+    typedef _LIBCPP_NODEBUG typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
+};
+
+#ifndef _LIBCPP_CXX03_LANG
+
+#if !__has_builtin(__type_pack_element)
+
+namespace __indexer_detail {
+
+template <size_t _Idx, class _Tp>
+struct __indexed { using type _LIBCPP_NODEBUG = _Tp; };
+
+template <class _Types, class _Indexes> struct __indexer;
+
+template <class ..._Types, size_t ..._Idx>
+struct __indexer<__tuple_types<_Types...>, __tuple_indices<_Idx...>>
+    : __indexed<_Idx, _Types>...
+{};
+
+template <size_t _Idx, class _Tp>
+__indexed<_Idx, _Tp> __at_index(__indexed<_Idx, _Tp> const&);
+
+} // namespace __indexer_detail
+
+template <size_t _Idx, class ..._Types>
+using __type_pack_element _LIBCPP_NODEBUG = typename decltype(
+    __indexer_detail::__at_index<_Idx>(
+        __indexer_detail::__indexer<
+            __tuple_types<_Types...>,
+            typename __make_tuple_indices<sizeof...(_Types)>::type
+        >{})
+  )::type;
+#endif
+
+template <size_t _Ip, class ..._Types>
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, __tuple_types<_Types...> >
+{
+    static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range");
+    typedef _LIBCPP_NODEBUG __type_pack_element<_Ip, _Types...> type;
+};
+
+#if _LIBCPP_STD_VER > 11
+template <size_t _Ip, class ..._Tp>
+using tuple_element_t _LIBCPP_NODEBUG = typename tuple_element <_Ip, _Tp...>::type;
+#endif
+
+#endif // _LIBCPP_CXX03_LANG
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___TUPLE_TUPLE_ELEMENT_H

libcxx/include/__tuple/tuple_indices.h

+//===----------------------------------------------------------------------===//
+//
+// 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___TUPLE_MAKE_TUPLE_INDICES_H
+#define _LIBCPP___TUPLE_MAKE_TUPLE_INDICES_H
+
+#include <__config>
+#include <__utility/integer_sequence.h>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#ifndef _LIBCPP_CXX03_LANG
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <size_t...> struct __tuple_indices {};
+
+template <size_t _Ep, size_t _Sp = 0>
+struct __make_tuple_indices
+{
+    static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
+    typedef __make_indices_imp<_Ep, _Sp> type;
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_CXX03_LANG
+
+#endif // _LIBCPP___TUPLE_MAKE_TUPLE_INDICES_H

libcxx/include/__tuple/tuple_like.h

+//===----------------------------------------------------------------------===//
+//
+// 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___TUPLE_TUPLE_LIKE_H
+#define _LIBCPP___TUPLE_TUPLE_LIKE_H
+
+#include <__config>
+#include <__fwd/array.h>
+#include <__fwd/pair.h>
+#include <__fwd/tuple.h>
+#include <__tuple/tuple_types.h>
+#include <__type_traits/integral_constant.h>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp> struct __tuple_like : false_type {};
+
+template <class _Tp> struct __tuple_like<const _Tp> : public __tuple_like<_Tp> {};
+template <class _Tp> struct __tuple_like<volatile _Tp> : public __tuple_like<_Tp> {};
+template <class _Tp> struct __tuple_like<const volatile _Tp> : public __tuple_like<_Tp> {};
+
+#ifndef _LIBCPP_CXX03_LANG
+template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};
+#endif
+
+template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {};
+
+template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};
+
+template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___TUPLE_TUPLE_LIKE_H

libcxx/include/__tuple/tuple_size.h

+//===----------------------------------------------------------------------===//
+//
+// 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___TUPLE_TUPLE_SIZE_H
+#define _LIBCPP___TUPLE_TUPLE_SIZE_H
+
+#include <__config>
+#include <__fwd/tuple.h>
+#include <__tuple/tuple_types.h>
+#include <__type_traits/is_const.h>
+#include <__type_traits/is_volatile.h>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size;
+
+#if !defined(_LIBCPP_CXX03_LANG)
+template <class _Tp, class...>
+using __enable_if_tuple_size_imp = _Tp;
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
+    const _Tp,
+    __enable_if_t<!is_volatile<_Tp>::value>,
+    integral_constant<size_t, sizeof(tuple_size<_Tp>)>>>
+    : public integral_constant<size_t, tuple_size<_Tp>::value> {};
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
+    volatile _Tp,
+    __enable_if_t<!is_const<_Tp>::value>,
+    integral_constant<size_t, sizeof(tuple_size<_Tp>)>>>
+    : public integral_constant<size_t, tuple_size<_Tp>::value> {};
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
+    const volatile _Tp,
+    integral_constant<size_t, sizeof(tuple_size<_Tp>)>>>
+    : public integral_constant<size_t, tuple_size<_Tp>::value> {};
+
+#else
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<const _Tp> : public tuple_size<_Tp> {};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<volatile _Tp> : public tuple_size<_Tp> {};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<const volatile _Tp> : public tuple_size<_Tp> {};
+#endif
+
+#ifndef _LIBCPP_CXX03_LANG
+
+template <class ..._Tp>
+struct _LIBCPP_TEMPLATE_VIS tuple_size<tuple<_Tp...> >
+    : public integral_constant<size_t, sizeof...(_Tp)>
+{
+};
+
+template <class ..._Tp>
+struct _LIBCPP_TEMPLATE_VIS tuple_size<__tuple_types<_Tp...> >
+    : public integral_constant<size_t, sizeof...(_Tp)>
+{
+};
+
+#endif // _LIBCPP_CXX03_LANG
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___TUPLE_TUPLE_SIZE_H

libcxx/include/__tuple/tuple_types.h

+//===----------------------------------------------------------------------===//
+//
+// 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___TUPLE_TUPLE_TYPES_H
+#define _LIBCPP___TUPLE_TUPLE_TYPES_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class ..._Tp> struct __tuple_types {};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___TUPLE_TUPLE_TYPES_H

libcxx/include/__utility/integer_sequence.h

 #include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+template <size_t...> struct __tuple_indices;
+
+template <class _IdxType, _IdxType... _Values>
+struct __integer_sequence {
+  template <template <class _OIdxType, _OIdxType...> class _ToIndexSeq, class _ToIndexType>
+  using __convert = _ToIndexSeq<_ToIndexType, _Values...>;
+
+  template <size_t _Sp>
+  using __to_tuple_indices = __tuple_indices<(_Values + _Sp)...>;
+};
+
+#if !__has_builtin(__make_integer_seq) || defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
+
+namespace __detail {
+
+template<typename _Tp, size_t ..._Extra> struct __repeat;
+template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<__integer_sequence<_Tp, _Np...>, _Extra...> {
+  typedef _LIBCPP_NODEBUG __integer_sequence<_Tp,
+                           _Np...,
+                           sizeof...(_Np) + _Np...,
+                           2 * sizeof...(_Np) + _Np...,
+                           3 * sizeof...(_Np) + _Np...,
+                           4 * sizeof...(_Np) + _Np...,
+                           5 * sizeof...(_Np) + _Np...,
+                           6 * sizeof...(_Np) + _Np...,
+                           7 * sizeof...(_Np) + _Np...,
+                           _Extra...> type;
+};
+
+template<size_t _Np> struct __parity;
+template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {};
+
+template<> struct __make<0> { typedef __integer_sequence<size_t> type; };
+template<> struct __make<1> { typedef __integer_sequence<size_t, 0> type; };
+template<> struct __make<2> { typedef __integer_sequence<size_t, 0, 1> type; };
+template<> struct __make<3> { typedef __integer_sequence<size_t, 0, 1, 2> type; };
+template<> struct __make<4> { typedef __integer_sequence<size_t, 0, 1, 2, 3> type; };
+template<> struct __make<5> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4> type; };
+template<> struct __make<6> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; };
+template<> struct __make<7> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; };
+
+template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; };
+template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; };
+template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; };
+template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; };
+template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
+template<> struct __parity<5> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
+template<> struct __parity<6> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
+template<> struct __parity<7> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 7, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
+
+} // namespace detail
+
+#endif
+
+#if __has_builtin(__make_integer_seq)
+template <size_t _Ep, size_t _Sp>
+using __make_indices_imp =
+    typename __make_integer_seq<__integer_sequence, size_t, _Ep - _Sp>::template
+    __to_tuple_indices<_Sp>;
+#else
+template <size_t _Ep, size_t _Sp>
+using __make_indices_imp =
+    typename __detail::__make<_Ep - _Sp>::type::template __to_tuple_indices<_Sp>;
+
+#endif
+
 #if _LIBCPP_STD_VER > 11
 
 template<class _Tp, _Tp... _Ip>
 struct _LIBCPP_TEMPLATE_VIS integer_sequence
 {
     typedef _Tp value_type;
     static_assert( is_integral<_Tp>::value,
                   "std::integer_sequence can only be instantiated with an integral type" );

libcxx/include/__utility/pair.h

 //===----------------------------------------------------------------------===//
 //
 // 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___UTILITY_PAIR_H
 #define _LIBCPP___UTILITY_PAIR_H
 
 #include <__compare/common_comparison_category.h>
 #include <__compare/synth_three_way.h>
 #include <__config>
 #include <__functional/unwrap_ref.h>
-#include <__tuple>
+#include <__fwd/get.h>
+#include <__fwd/tuple.h>
+#include <__tuple/sfinae_helpers.h>
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_indices.h>
+#include <__tuple/tuple_size.h>
 #include <__type_traits/is_implicitly_default_constructible.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/piecewise_construct.h>
 #include <cstddef>
 #include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)

libcxx/include/array

 
 #include <__algorithm/equal.h>
 #include <__algorithm/fill_n.h>
 #include <__algorithm/lexicographical_compare.h>
 #include <__algorithm/swap_ranges.h>
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
 #include <__iterator/reverse_iterator.h>
-#include <__tuple>
+#include <__tuple/sfinae_helpers.h>
 #include <__utility/integer_sequence.h>
 #include <__utility/move.h>
 #include <__utility/unreachable.h>
 #include <stdexcept>
 #include <type_traits>
 #include <version>
 
 // standard-mandated includes
 
 // [iterator.range]
 #include <__iterator/access.h>
 #include <__iterator/data.h>
 #include <__iterator/empty.h>
 #include <__iterator/reverse_access.h>
 #include <__iterator/size.h>
 
 // [array.syn]
 #include <compare>
 #include <initializer_list>
 
+// [tuple.helper]
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_size.h>
+
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 template <class _Tp, size_t _Size>
 struct _LIBCPP_TEMPLATE_VIS array

libcxx/include/experimental/memory_resource

 } // namespace fundamentals_v1
 } // namespace experimental
 } // namespace std
 
  */
 
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__memory/allocator_traits.h>
-#include <__tuple>
 #include <__utility/move.h>
 #include <cstddef>
 #include <cstdlib>
 #include <experimental/__config>
 #include <experimental/__memory>
 #include <limits>
 #include <new>
 #include <stdexcept>

libcxx/include/module.modulemap.in

module std [system] {
   module any {
     header "any"
     export *
   }
   module array {
     header "array"
     export initializer_list
     export *
+
+    module array_fwd { private header "__fwd/array.h" }
   }
   module atomic {
     header "atomic"
     export *
   }
   module barrier {
     @requires_LIBCXX_ENABLE_THREADS@
     header "barrier"
module thread {
     module __thread {
       module poll_with_backoff    { private header "__thread/poll_with_backoff.h" }
       module timed_backoff_policy { private header "__thread/timed_backoff_policy.h" }
     }
   }
   module tuple {
     header "tuple"
     export *
+
+    module apply_cv         { private header "__tuple/apply_cv.h" }
+    module get_fwd          { private header "__fwd/get.h" }
+    module make_tuple_types { private header "__tuple/make_tuple_types.h" }
+    module sfinae_helpers   { private header "__tuple/sfinae_helpers.h" }
+    module tuple_element    { private header "__tuple/tuple_element.h" }
+    module tuple_fwd        { private header "__fwd/tuple.h" }
+    module tuple_indices    { private header "__tuple/tuple_indices.h" }
+    module tuple_like       { private header "__tuple/tuple_like.h" }
+    module tuple_size       { private header "__tuple/tuple_size.h" }
+    module tuple_types      { private header "__tuple/tuple_types.h" }
   }
   module type_traits {
     header "type_traits"
     export functional.__functional.unwrap_ref
     export *
 
     module add_const                           { private header "__type_traits/add_const.h" }
     module add_cv                              { private header "__type_traits/add_cv.h" }

   module __node_handle       { private header "__node_handle"       export * }
   module __split_buffer      { private header "__split_buffer"      export * }
   module __std_stream        {
     @requires_LIBCXX_ENABLE_LOCALIZATION@
     private header "__std_stream" export *
   }
   module __threading_support {         header "__threading_support" export * }
   module __tree              {         header "__tree"              export * }
-  module __tuple             { private header "__tuple"             export * }
   module __undef_macros      {         header "__undef_macros"      export * }
   module __verbose_abort     {         header "__verbose_abort"     export * }
 
   module experimental {
     requires cplusplus11
 
     module algorithm {
       header "experimental/algorithm"

libcxx/include/optional

 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__availability>
 #include <__concepts/invocable.h>
 #include <__config>
 #include <__functional/hash.h>
 #include <__functional/invoke.h>
 #include <__functional/unary_function.h>
 #include <__memory/construct_at.h>
-#include <__tuple>
+#include <__tuple/sfinae_helpers.h>
 #include <__utility/forward.h>
 #include <__utility/in_place.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
 #include <initializer_list>
 #include <new>
 #include <stdexcept>
 #include <type_traits>

libcxx/include/ranges

 #include <__ranges/single_view.h>
 #include <__ranges/size.h>
 #include <__ranges/subrange.h>
 #include <__ranges/take_view.h>
 #include <__ranges/transform_view.h>
 #include <__ranges/view_interface.h>
 #include <__ranges/views.h>
 #include <__ranges/zip_view.h>
-#include <__tuple> // TODO: <ranges> has to export std::tuple_size. Replace this, once <tuple> is granularized.
 #include <type_traits>
 #include <version>
 
 // standard-mandated includes
+
+// [ranges.syn]
 #include <compare>
 #include <initializer_list>
 #include <iterator>
 
+// [tuple.helper]
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_size.h>
+
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 #endif // _LIBCPP_RANGES

libcxx/include/tuple

 
 */
 
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__compare/common_comparison_category.h>
 #include <__compare/synth_three_way.h>
 #include <__config>
 #include <__functional/unwrap_ref.h>
+#include <__fwd/array.h>
 #include <__memory/allocator_arg_t.h>
 #include <__memory/uses_allocator.h>
-#include <__tuple>
 #include <__type_traits/maybe_const.h>
 #include <__utility/forward.h>
 #include <__utility/integer_sequence.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
 #include <__utility/piecewise_construct.h>
 #include <__utility/swap.h>
 #include <cstddef>

libcxx/include/utility

template <class T>
     constexpr underlying_type_t<T> to_underlying( T value ) noexcept; // C++2b
 
 }  // std
 
 */
 
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
-#include <__tuple>
 #include <__utility/as_const.h>
 #include <__utility/auto_cast.h>
 #include <__utility/cmp.h>
 #include <__utility/declval.h>
 #include <__utility/exchange.h>
 #include <__utility/forward.h>
 #include <__utility/forward_like.h>
 #include <__utility/in_place.h>
 #include <__utility/integer_sequence.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
 #include <__utility/piecewise_construct.h>
 #include <__utility/priority_tag.h>
 #include <__utility/rel_ops.h>
 #include <__utility/swap.h>
 #include <__utility/to_underlying.h>
 #include <__utility/transaction.h>
 #include <__utility/unreachable.h>
 #include <type_traits>
 #include <version>
 
 // standard-mandated includes
+
+// [utility.syn]
 #include <compare>
 #include <initializer_list>
 
+// [tuple.helper]
+#include <__tuple/tuple_element.h>
+#include <__tuple/tuple_size.h>
+
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <iosfwd>
 #endif
 
 #endif // _LIBCPP_UTILITY

libcxx/include/variant

 #include <__availability>
 #include <__compare/common_comparison_category.h>
 #include <__compare/compare_three_way_result.h>
 #include <__compare/three_way_comparable.h>
 #include <__config>
 #include <__functional/hash.h>
 #include <__functional/operations.h>
 #include <__functional/unary_function.h>
-#include <__tuple>
 #include <__type_traits/dependent_type.h>
 #include <__utility/forward.h>
 #include <__utility/in_place.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
 #include <__variant/monostate.h>
 #include <exception>
 #include <initializer_list>

libcxx/test/libcxx/private_headers.verify.cpp

 #include <__functional/pointer_to_binary_function.h> // expected-error@*:* {{use of private header from outside its module: '__functional/pointer_to_binary_function.h'}}
 #include <__functional/pointer_to_unary_function.h> // expected-error@*:* {{use of private header from outside its module: '__functional/pointer_to_unary_function.h'}}
 #include <__functional/ranges_operations.h> // expected-error@*:* {{use of private header from outside its module: '__functional/ranges_operations.h'}}
 #include <__functional/reference_wrapper.h> // expected-error@*:* {{use of private header from outside its module: '__functional/reference_wrapper.h'}}
 #include <__functional/unary_function.h> // expected-error@*:* {{use of private header from outside its module: '__functional/unary_function.h'}}
 #include <__functional/unary_negate.h> // expected-error@*:* {{use of private header from outside its module: '__functional/unary_negate.h'}}
 #include <__functional/unwrap_ref.h> // expected-error@*:* {{use of private header from outside its module: '__functional/unwrap_ref.h'}}
 #include <__functional/weak_result_type.h> // expected-error@*:* {{use of private header from outside its module: '__functional/weak_result_type.h'}}
+#include <__fwd/array.h> // expected-error@*:* {{use of private header from outside its module: '__fwd/array.h'}}
+#include <__fwd/get.h> // expected-error@*:* {{use of private header from outside its module: '__fwd/get.h'}}
 #include <__fwd/hash.h> // expected-error@*:* {{use of private header from outside its module: '__fwd/hash.h'}}
 #include <__fwd/pair.h> // expected-error@*:* {{use of private header from outside its module: '__fwd/pair.h'}}
 #include <__fwd/span.h> // expected-error@*:* {{use of private header from outside its module: '__fwd/span.h'}}
 #include <__fwd/string_view.h> // expected-error@*:* {{use of private header from outside its module: '__fwd/string_view.h'}}
+#include <__fwd/tuple.h> // expected-error@*:* {{use of private header from outside its module: '__fwd/tuple.h'}}
 #include <__ios/fpos.h> // expected-error@*:* {{use of private header from outside its module: '__ios/fpos.h'}}
 #include <__iterator/access.h> // expected-error@*:* {{use of private header from outside its module: '__iterator/access.h'}}
 #include <__iterator/advance.h> // expected-error@*:* {{use of private header from outside its module: '__iterator/advance.h'}}
 #include <__iterator/back_insert_iterator.h> // expected-error@*:* {{use of private header from outside its module: '__iterator/back_insert_iterator.h'}}
 #include <__iterator/bounded_iter.h> // expected-error@*:* {{use of private header from outside its module: '__iterator/bounded_iter.h'}}
 #include <__iterator/common_iterator.h> // expected-error@*:* {{use of private header from outside its module: '__iterator/common_iterator.h'}}
 #include <__iterator/concepts.h> // expected-error@*:* {{use of private header from outside its module: '__iterator/concepts.h'}}
 #include <__iterator/counted_iterator.h> // expected-error@*:* {{use of private header from outside its module: '__iterator/counted_iterator.h'}}

 #include <__ranges/views.h> // expected-error@*:* {{use of private header from outside its module: '__ranges/views.h'}}
 #include <__ranges/zip_view.h> // expected-error@*:* {{use of private header from outside its module: '__ranges/zip_view.h'}}
 #include <__split_buffer> // expected-error@*:* {{use of private header from outside its module: '__split_buffer'}}
 #include <__std_stream> // expected-error@*:* {{use of private header from outside its module: '__std_stream'}}
 #include <__string/char_traits.h> // expected-error@*:* {{use of private header from outside its module: '__string/char_traits.h'}}
 #include <__string/extern_template_lists.h> // expected-error@*:* {{use of private header from outside its module: '__string/extern_template_lists.h'}}
 #include <__thread/poll_with_backoff.h> // expected-error@*:* {{use of private header from outside its module: '__thread/poll_with_backoff.h'}}
 #include <__thread/timed_backoff_policy.h> // expected-error@*:* {{use of private header from outside its module: '__thread/timed_backoff_policy.h'}}
-#include <__tuple> // expected-error@*:* {{use of private header from outside its module: '__tuple'}}
+#include <__tuple/apply_cv.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/apply_cv.h'}}
+#include <__tuple/make_tuple_types.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/make_tuple_types.h'}}
+#include <__tuple/sfinae_helpers.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/sfinae_helpers.h'}}
+#include <__tuple/tuple_element.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/tuple_element.h'}}
+#include <__tuple/tuple_indices.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/tuple_indices.h'}}
+#include <__tuple/tuple_like.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/tuple_like.h'}}
+#include <__tuple/tuple_size.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/tuple_size.h'}}
+#include <__tuple/tuple_types.h> // expected-error@*:* {{use of private header from outside its module: '__tuple/tuple_types.h'}}
 #include <__type_traits/add_const.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/add_const.h'}}
 #include <__type_traits/add_cv.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/add_cv.h'}}
 #include <__type_traits/add_lvalue_reference.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/add_lvalue_reference.h'}}
 #include <__type_traits/add_pointer.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/add_pointer.h'}}
 #include <__type_traits/add_rvalue_reference.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/add_rvalue_reference.h'}}
 #include <__type_traits/add_volatile.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/add_volatile.h'}}
 #include <__type_traits/aligned_storage.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/aligned_storage.h'}}
 #include <__type_traits/aligned_union.h> // expected-error@*:* {{use of private header from outside its module: '__type_traits/aligned_union.h'}}

libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.fail.cpp

 #include <type_traits>
 
 int main(int, char**)
 {
     using T =  std::tuple<int, long, void*>;
     using E1 = typename std::tuple_element<1, T &>::type; // expected-error{{undefined template}}
     using E2 = typename std::tuple_element<3, T>::type;
     using E3 = typename std::tuple_element<4, T const>::type;
-        // expected-error-re@__tuple:* 2 {{{{(static_assert|static assertion)}} failed}}
-
+        // expected-error-re@*:* 2 {{{{(static_assert|static assertion)}} failed}}
 
   return 0;
 }

libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.fail.cpp

 template <>
 struct std::tuple_size<Dummy3> {};
 
 int main(int, char**)
 {
   // Test that tuple_size<const T> is not incomplete when tuple_size<T>::value
   // is well-formed but not a constant expression.
   {
-    // expected-error@__tuple:* 1 {{is not a constant expression}}
+    // expected-error@*:* 1 {{is not a constant expression}}
     (void)std::tuple_size<const Dummy1>::value; // expected-note {{here}}
   }
   // Test that tuple_size<const T> is not incomplete when tuple_size<T>::value
   // is well-formed but not convertible to size_t.
   {
-    // expected-error@__tuple:* 1 {{value of type 'void ()' is not implicitly convertible to}}
+    // expected-error@*:* 1 {{value of type 'void ()' is not implicitly convertible to}}
     (void)std::tuple_size<const Dummy2>::value; // expected-note {{here}}
   }
   // Test that tuple_size<const T> generates an error when tuple_size<T> is
   // complete but ::value isn't a constant expression convertible to size_t.
   {
-    // expected-error@__tuple:* 1 {{no member named 'value'}}
+    // expected-error@*:* 1 {{no member named 'value'}}
     (void)std::tuple_size<const Dummy3>::value; // expected-note {{here}}
   }
 
   return 0;
 }