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[libc++] Refactor internal index_sequence API to match the public one (#149475)

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The internal API is a lot more complicated than it actually needs to be.
This refactors the internal API to match the features and names of the
public one.
This commit is contained in:
Nikolas Klauser
2025-07-20 11:23:31 +02:00
committed by GitHub
parent 5b0935f1f0
commit 6c257754d9
18 changed files with 141 additions and 210 deletions
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1
libcxx/include/CMakeLists.txt
View File

@@ -781,7 +781,6 @@ set(files
__tuple/make_tuple_types.h
__tuple/sfinae_helpers.h
__tuple/tuple_element.h
__tuple/tuple_indices.h
__tuple/tuple_like.h
__tuple/tuple_like_ext.h
__tuple/tuple_like_no_subrange.h

21
libcxx/include/__functional/bind.h
View File

@@ -83,15 +83,14 @@ inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp& __mu(reference_w
template <class _Ti, class... _Uj, size_t... _Indx>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __invoke_result_t<_Ti&, _Uj...>
__mu_expand(_Ti& __ti, tuple<_Uj...>& __uj, __tuple_indices<_Indx...>) {
__mu_expand(_Ti& __ti, tuple<_Uj...>& __uj, __index_sequence<_Indx...>) {
return __ti(std::forward<_Uj>(std::get<_Indx>(__uj))...);
}
template <class _Ti, class... _Uj, __enable_if_t<is_bind_expression<_Ti>::value, int> = 0>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __invoke_result_t<_Ti&, _Uj...>
__mu(_Ti& __ti, tuple<_Uj...>& __uj) {
typedef typename __make_tuple_indices<sizeof...(_Uj)>::type __indices;
return std::__mu_expand(__ti, __uj, __indices());
return std::__mu_expand(__ti, __uj, __make_index_sequence<sizeof...(_Uj)>());
}
template <bool _IsPh, class _Ti, class _Uj>
@@ -191,7 +190,7 @@ struct __bind_return<_Fp, const tuple<_BoundArgs...>, _TupleUj, true> {
template <class _Fp, class _BoundArgs, size_t... _Indx, class _Args>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 typename __bind_return<_Fp, _BoundArgs, _Args>::type
__apply_functor(_Fp& __f, _BoundArgs& __bound_args, __tuple_indices<_Indx...>, _Args&& __args) {
__apply_functor(_Fp& __f, _BoundArgs& __bound_args, __index_sequence<_Indx...>, _Args&& __args) {
return std::__invoke(__f, std::__mu(std::get<_Indx>(__bound_args), __args)...);
}
@@ -205,8 +204,6 @@ private:
_Fd __f_;
_Td __bound_args_;
typedef typename __make_tuple_indices<sizeof...(_BoundArgs)>::type __indices;
public:
template <
class _Gp,
@@ -219,14 +216,22 @@ public:
template <class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 typename __bind_return<_Fd, _Td, tuple<_Args&&...> >::type
operator()(_Args&&... __args) {
return std::__apply_functor(__f_, __bound_args_, __indices(), tuple<_Args&&...>(std::forward<_Args>(__args)...));
return std::__apply_functor(
__f_,
__bound_args_,
__make_index_sequence<sizeof...(_BoundArgs)>(),
tuple<_Args&&...>(std::forward<_Args>(__args)...));
}
template <class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
typename __bind_return<const _Fd, const _Td, tuple<_Args&&...> >::type
operator()(_Args&&... __args) const {
return std::__apply_functor(__f_, __bound_args_, __indices(), tuple<_Args&&...>(std::forward<_Args>(__args)...));
return std::__apply_functor(
__f_,
__bound_args_,
__make_index_sequence<sizeof...(_BoundArgs)>(),
tuple<_Args&&...>(std::forward<_Args>(__args)...));
}
};

10
libcxx/include/__memory_resource/polymorphic_allocator.h
View File

@@ -135,10 +135,10 @@ public:
piecewise_construct,
__transform_tuple(typename __uses_alloc_ctor< _T1, polymorphic_allocator&, _Args1... >::type(),
std::move(__x),
typename __make_tuple_indices<sizeof...(_Args1)>::type{}),
make_index_sequence<sizeof...(_Args1)>()),
__transform_tuple(typename __uses_alloc_ctor< _T2, polymorphic_allocator&, _Args2... >::type(),
std::move(__y),
typename __make_tuple_indices<sizeof...(_Args2)>::type{}));
make_index_sequence<sizeof...(_Args2)>()));
}
template <class _T1, class _T2>
@@ -194,20 +194,20 @@ public:
private:
template <class... _Args, size_t... _Is>
_LIBCPP_HIDE_FROM_ABI tuple<_Args&&...>
__transform_tuple(integral_constant<int, 0>, tuple<_Args...>&& __t, __tuple_indices<_Is...>) {
__transform_tuple(integral_constant<int, 0>, tuple<_Args...>&& __t, index_sequence<_Is...>) {
return std::forward_as_tuple(std::get<_Is>(std::move(__t))...);
}
template <class... _Args, size_t... _Is>
_LIBCPP_HIDE_FROM_ABI tuple<allocator_arg_t const&, polymorphic_allocator&, _Args&&...>
__transform_tuple(integral_constant<int, 1>, tuple<_Args...>&& __t, __tuple_indices<_Is...>) {
__transform_tuple(integral_constant<int, 1>, tuple<_Args...>&& __t, index_sequence<_Is...>) {
using _Tup = tuple<allocator_arg_t const&, polymorphic_allocator&, _Args&&...>;
return _Tup(allocator_arg, *this, std::get<_Is>(std::move(__t))...);
}
template <class... _Args, size_t... _Is>
_LIBCPP_HIDE_FROM_ABI tuple<_Args&&..., polymorphic_allocator&>
__transform_tuple(integral_constant<int, 2>, tuple<_Args...>&& __t, __tuple_indices<_Is...>) {
__transform_tuple(integral_constant<int, 2>, tuple<_Args...>&& __t, index_sequence<_Is...>) {
using _Tup = tuple<_Args&&..., polymorphic_allocator&>;
return _Tup(std::get<_Is>(std::move(__t))..., *this);
}

11
libcxx/include/__mutex/once_flag.h
View File

@@ -13,9 +13,9 @@
#include <__functional/invoke.h>
#include <__memory/addressof.h>
#include <__memory/shared_count.h> // __libcpp_acquire_load
#include <__tuple/tuple_indices.h>
#include <__tuple/tuple_size.h>
#include <__utility/forward.h>
#include <__utility/integer_sequence.h>
#include <__utility/move.h>
#include <cstdint>
#ifndef _LIBCPP_CXX03_LANG
@@ -87,15 +87,12 @@ class __call_once_param {
public:
_LIBCPP_HIDE_FROM_ABI explicit __call_once_param(_Fp& __f) : __f_(__f) {}
_LIBCPP_HIDE_FROM_ABI void operator()() {
typedef typename __make_tuple_indices<tuple_size<_Fp>::value, 1>::type _Index;
__execute(_Index());
}
_LIBCPP_HIDE_FROM_ABI void operator()() { __execute(__make_index_sequence<tuple_size<_Fp>::value>()); }
private:
template <size_t... _Indices>
_LIBCPP_HIDE_FROM_ABI void __execute(__tuple_indices<_Indices...>) {
std::__invoke(std::get<0>(std::move(__f_)), std::get<_Indices>(std::move(__f_))...);
_LIBCPP_HIDE_FROM_ABI void __execute(__index_sequence<_Indices...>) {
std::__invoke(std::get<_Indices>(std::move(__f_))...);
}
};

7
libcxx/include/__thread/thread.h
View File

@@ -155,8 +155,8 @@ operator<<(basic_ostream<_CharT, _Traits>& __os, __thread_id __id) {
# ifndef _LIBCPP_CXX03_LANG
template <class _TSp, class _Fp, class... _Args, size_t... _Indices>
inline _LIBCPP_HIDE_FROM_ABI void __thread_execute(tuple<_TSp, _Fp, _Args...>& __t, __tuple_indices<_Indices...>) {
std::__invoke(std::move(std::get<1>(__t)), std::move(std::get<_Indices>(__t))...);
inline _LIBCPP_HIDE_FROM_ABI void __thread_execute(tuple<_TSp, _Fp, _Args...>& __t, __index_sequence<_Indices...>) {
std::__invoke(std::move(std::get<_Indices + 1>(__t))...);
}
template <class _Fp>
@@ -164,8 +164,7 @@ _LIBCPP_HIDE_FROM_ABI void* __thread_proxy(void* __vp) {
// _Fp = tuple< unique_ptr<__thread_struct>, Functor, Args...>
unique_ptr<_Fp> __p(static_cast<_Fp*>(__vp));
__thread_local_data().set_pointer(std::get<0>(*__p.get()).release());
typedef typename __make_tuple_indices<tuple_size<_Fp>::value, 2>::type _Index;
std::__thread_execute(*__p.get(), _Index());
std::__thread_execute(*__p.get(), __make_index_sequence<tuple_size<_Fp>::value - 1>());
return nullptr;
}

25
libcxx/include/__tuple/make_tuple_types.h
View File

@@ -14,12 +14,12 @@
#include <__fwd/array.h>
#include <__fwd/tuple.h>
#include <__tuple/tuple_element.h>
#include <__tuple/tuple_indices.h>
#include <__tuple/tuple_size.h>
#include <__tuple/tuple_types.h>
#include <__type_traits/copy_cvref.h>
#include <__type_traits/remove_cvref.h>
#include <__type_traits/remove_reference.h>
#include <__utility/integer_sequence.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
@@ -38,38 +38,35 @@ 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...>> {
struct __make_tuple_types_flat<_Tuple<_Types...>, __index_sequence<_Idx...>> {
// Specialization for pair, tuple, and __tuple_types
template <class _Tp>
using __apply_quals _LIBCPP_NODEBUG = __tuple_types<__copy_cvref_t<_Tp, __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...>> {
struct __make_tuple_types_flat<array<_Vt, _Np>, __index_sequence<_Idx...>> {
template <size_t>
using __value_type _LIBCPP_NODEBUG = _Vt;
template <class _Tp>
using __apply_quals _LIBCPP_NODEBUG = __tuple_types<__copy_cvref_t<_Tp, __value_type<_Idx>>...>;
};
template <class _Tp,
size_t _Ep = tuple_size<__libcpp_remove_reference_t<_Tp> >::value,
size_t _Sp = 0,
bool _SameSize = (_Ep == tuple_size<__libcpp_remove_reference_t<_Tp> >::value)>
template <class _Tp>
struct __make_tuple_types {
static_assert(_Sp <= _Ep, "__make_tuple_types input error");
using _RawTp _LIBCPP_NODEBUG = __remove_cvref_t<_Tp>;
using _Maker _LIBCPP_NODEBUG = __make_tuple_types_flat<_RawTp, typename __make_tuple_indices<_Ep, _Sp>::type>;
using type _LIBCPP_NODEBUG = typename _Maker::template __apply_quals<_Tp>;
using _Maker _LIBCPP_NODEBUG =
__make_tuple_types_flat<_RawTp, __make_index_sequence<tuple_size<__libcpp_remove_reference_t<_Tp>>::value>>;
using type _LIBCPP_NODEBUG = typename _Maker::template __apply_quals<_Tp>;
};
template <class... _Types, size_t _Ep>
struct __make_tuple_types<tuple<_Types...>, _Ep, 0, true> {
template <class... _Types>
struct __make_tuple_types<tuple<_Types...>> {
using type _LIBCPP_NODEBUG = __tuple_types<_Types...>;
};
template <class... _Types, size_t _Ep>
struct __make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true> {
template <class... _Types>
struct __make_tuple_types<__tuple_types<_Types...>> {
using type _LIBCPP_NODEBUG = __tuple_types<_Types...>;
};

1
libcxx/include/__tuple/tuple_element.h
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@@ -11,7 +11,6 @@
#include <__config>
#include <__cstddef/size_t.h>
#include <__tuple/tuple_indices.h>
#include <__tuple/tuple_types.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)

37
libcxx/include/__tuple/tuple_indices.h
View File

@@ -1,37 +0,0 @@
//===----------------------------------------------------------------------===//
//
// 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 <__cstddef/size_t.h>
#include <__utility/integer_sequence.h>
#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

72
libcxx/include/__utility/integer_sequence.h
View File

@@ -17,57 +17,41 @@
# pragma GCC system_header
#endif
#ifndef _LIBCPP_CXX03_LANG
_LIBCPP_BEGIN_NAMESPACE_STD
template <size_t...>
struct __tuple_indices;
# if __has_builtin(__make_integer_seq)
template <template <class _Tp, _Tp...> class _BaseType, class _Tp, _Tp _SequenceSize>
using __make_integer_sequence_impl _LIBCPP_NODEBUG = __make_integer_seq<_BaseType, _Tp, _SequenceSize>;
# else
template <template <class _Tp, _Tp...> class _BaseType, class _Tp, _Tp _SequenceSize>
using __make_integer_sequence_impl _LIBCPP_NODEBUG = _BaseType<_Tp, __integer_pack(_SequenceSize)...>;
# endif
template <class _IdxType, _IdxType... _Values>
template <class _Tp, _Tp... _Indices>
struct __integer_sequence {
template <template <class _OIdxType, _OIdxType...> class _ToIndexSeq, class _ToIndexType>
using __convert _LIBCPP_NODEBUG = _ToIndexSeq<_ToIndexType, _Values...>;
template <size_t _Sp>
using __to_tuple_indices _LIBCPP_NODEBUG = __tuple_indices<(_Values + _Sp)...>;
};
#if __has_builtin(__make_integer_seq)
template <size_t _Ep, size_t _Sp>
using __make_indices_imp _LIBCPP_NODEBUG =
typename __make_integer_seq<__integer_sequence, size_t, _Ep - _Sp>::template __to_tuple_indices<_Sp>;
#elif __has_builtin(__integer_pack)
template <size_t _Ep, size_t _Sp>
using __make_indices_imp _LIBCPP_NODEBUG =
typename __integer_sequence<size_t, __integer_pack(_Ep - _Sp)...>::template __to_tuple_indices<_Sp>;
#else
# error "No known way to get an integer pack from the compiler"
#endif
#if _LIBCPP_STD_VER >= 14
template <class _Tp, _Tp... _Ip>
struct integer_sequence {
typedef _Tp value_type;
using value_type = _Tp;
static_assert(is_integral<_Tp>::value, "std::integer_sequence can only be instantiated with an integral type");
static _LIBCPP_HIDE_FROM_ABI constexpr size_t size() noexcept { return sizeof...(_Ip); }
static _LIBCPP_HIDE_FROM_ABI constexpr size_t size() noexcept { return sizeof...(_Indices); }
};
template <size_t... _Indices>
using __index_sequence _LIBCPP_NODEBUG = __integer_sequence<size_t, _Indices...>;
template <size_t _SequenceSize>
using __make_index_sequence _LIBCPP_NODEBUG = __make_integer_sequence_impl<__integer_sequence, size_t, _SequenceSize>;
# if _LIBCPP_STD_VER >= 14
template <class _Tp, _Tp... _Indices>
struct integer_sequence : __integer_sequence<_Tp, _Indices...> {};
template <size_t... _Ip>
using index_sequence = integer_sequence<size_t, _Ip...>;
# if __has_builtin(__make_integer_seq)
template <class _Tp, _Tp _Ep>
using make_integer_sequence _LIBCPP_NODEBUG = __make_integer_seq<integer_sequence, _Tp, _Ep>;
# elif __has_builtin(__integer_pack)
template <class _Tp, _Tp _SequenceSize>
using make_integer_sequence _LIBCPP_NODEBUG = integer_sequence<_Tp, __integer_pack(_SequenceSize)...>;
# else
# error "No known way to get an integer pack from the compiler"
# endif
using make_integer_sequence _LIBCPP_NODEBUG = __make_integer_sequence_impl<integer_sequence, _Tp, _Ep>;
template <size_t _Np>
using make_index_sequence = make_integer_sequence<size_t, _Np>;
@@ -75,16 +59,18 @@ using make_index_sequence = make_integer_sequence<size_t, _Np>;
template <class... _Tp>
using index_sequence_for = make_index_sequence<sizeof...(_Tp)>;
# if _LIBCPP_STD_VER >= 20
# if _LIBCPP_STD_VER >= 20
// Executes __func for every element in an index_sequence.
template <size_t... _Index, class _Function>
_LIBCPP_HIDE_FROM_ABI constexpr void __for_each_index_sequence(index_sequence<_Index...>, _Function __func) {
(__func.template operator()<_Index>(), ...);
}
# endif // _LIBCPP_STD_VER >= 20
# endif // _LIBCPP_STD_VER >= 20
#endif // _LIBCPP_STD_VER >= 14
# endif // _LIBCPP_STD_VER >= 14
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_CXX03_LANG
#endif // _LIBCPP___UTILITY_INTEGER_SEQUENCE_H

10
libcxx/include/__utility/pair.h
View File

@@ -18,7 +18,6 @@
#include <__fwd/array.h>
#include <__fwd/pair.h>
#include <__fwd/tuple.h>
#include <__tuple/tuple_indices.h>
#include <__tuple/tuple_like_no_subrange.h>
#include <__tuple/tuple_size.h>
#include <__type_traits/common_reference.h>
@@ -40,6 +39,7 @@
#include <__type_traits/unwrap_ref.h>
#include <__utility/declval.h>
#include <__utility/forward.h>
#include <__utility/integer_sequence.h>
#include <__utility/move.h>
#include <__utility/piecewise_construct.h>
@@ -225,8 +225,8 @@ struct pair
: pair(__pc,
__first_args,
__second_args,
typename __make_tuple_indices<sizeof...(_Args1)>::type(),
typename __make_tuple_indices<sizeof...(_Args2) >::type()) {}
__make_index_sequence<sizeof...(_Args1)>(),
__make_index_sequence<sizeof...(_Args2)>()) {}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair&
operator=(__conditional_t<is_copy_assignable<first_type>::value && is_copy_assignable<second_type>::value,
@@ -440,8 +440,8 @@ private:
pair(piecewise_construct_t,
tuple<_Args1...>& __first_args,
tuple<_Args2...>& __second_args,
__tuple_indices<_I1...>,
__tuple_indices<_I2...>)
__index_sequence<_I1...>,
__index_sequence<_I2...>)
: first(std::forward<_Args1>(std::get<_I1>(__first_args))...),
second(std::forward<_Args2>(std::get<_I2>(__second_args))...) {}
#endif

10
libcxx/include/bitset
View File

@@ -147,7 +147,6 @@ template <size_t N> struct hash<std::bitset<N>>;
# include <__functional/hash.h>
# include <__functional/identity.h>
# include <__functional/unary_function.h>
# include <__tuple/tuple_indices.h>
# include <__type_traits/enable_if.h>
# include <__type_traits/integral_constant.h>
# include <__type_traits/is_char_like_type.h>
@@ -314,7 +313,7 @@ private:
_LIBCPP_HIDE_FROM_ABI void __init(unsigned long long __v, true_type) _NOEXCEPT;
# else
template <size_t... _Indices>
_LIBCPP_HIDE_FROM_ABI constexpr __bitset(unsigned long long __v, std::__tuple_indices<_Indices...>) _NOEXCEPT
_LIBCPP_HIDE_FROM_ABI constexpr __bitset(unsigned long long __v, __index_sequence<_Indices...>) _NOEXCEPT
: __first_{static_cast<__storage_type>(__v >> (_Indices * __bits_per_word))...} {}
# endif // _LIBCPP_CXX03_LANG
};
@@ -352,10 +351,9 @@ template <size_t _N_words, size_t _Size>
inline _LIBCPP_CONSTEXPR __bitset<_N_words, _Size>::__bitset(unsigned long long __v) _NOEXCEPT
# ifndef _LIBCPP_CXX03_LANG
: __bitset(__v,
std::__make_indices_imp< (_N_words < (sizeof(unsigned long long) - 1) / sizeof(__storage_type) + 1)
? _N_words
: (sizeof(unsigned long long) - 1) / sizeof(__storage_type) + 1,
0>{})
__make_index_sequence<(_N_words < (sizeof(unsigned long long) - 1) / sizeof(__storage_type) + 1)
? _N_words
: (sizeof(unsigned long long) - 1) / sizeof(__storage_type) + 1>())
# endif
{
# ifdef _LIBCPP_CXX03_LANG

9
libcxx/include/future
View File

@@ -1842,15 +1842,12 @@ public:
_LIBCPP_HIDE_FROM_ABI __async_func(__async_func&& __f) : __f_(std::move(__f.__f_)) {}
_LIBCPP_HIDE_FROM_ABI _Rp operator()() {
typedef typename __make_tuple_indices<1 + sizeof...(_Args), 1>::type _Index;
return __execute(_Index());
}
_LIBCPP_HIDE_FROM_ABI _Rp operator()() { return __execute(__make_index_sequence<sizeof...(_Args) + 1>()); }
private:
template <size_t... _Indices>
_LIBCPP_HIDE_FROM_ABI _Rp __execute(__tuple_indices<_Indices...>) {
return std::__invoke(std::move(std::get<0>(__f_)), std::move(std::get<_Indices>(__f_))...);
_LIBCPP_HIDE_FROM_ABI _Rp __execute(__index_sequence<_Indices...>) {
return std::__invoke(std::move(std::get<_Indices>(__f_))...);
}
};

1
libcxx/include/module.modulemap.in
View File

@@ -2113,7 +2113,6 @@ module std [system] {
module make_tuple_types { header "__tuple/make_tuple_types.h" }
module sfinae_helpers { header "__tuple/sfinae_helpers.h" }
module tuple_element { header "__tuple/tuple_element.h" }
module tuple_indices { header "__tuple/tuple_indices.h" }
module tuple_like_ext { header "__tuple/tuple_like_ext.h" }
module tuple_like_no_subrange { header "__tuple/tuple_like_no_subrange.h" }
module tuple_like { header "__tuple/tuple_like.h" }

7
libcxx/include/mutex
View File

@@ -469,17 +469,14 @@ public:
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI scoped_lock(adopt_lock_t, _MArgs&... __margs) : __t_(__margs...) {}
_LIBCPP_HIDE_FROM_ABI ~scoped_lock() {
typedef typename __make_tuple_indices<sizeof...(_MArgs)>::type _Indices;
__unlock_unpack(_Indices{}, __t_);
}
_LIBCPP_HIDE_FROM_ABI ~scoped_lock() { __unlock_unpack(make_index_sequence<sizeof...(_MArgs)>(), __t_); }
scoped_lock(scoped_lock const&) = delete;
scoped_lock& operator=(scoped_lock const&) = delete;
private:
template <size_t... _Indx>
_LIBCPP_HIDE_FROM_ABI static void __unlock_unpack(__tuple_indices<_Indx...>, _MutexTuple& __mt) {
_LIBCPP_HIDE_FROM_ABI static void __unlock_unpack(index_sequence<_Indx...>, _MutexTuple& __mt) {
(std::get<_Indx>(__mt).unlock(), ...);
}

10
libcxx/include/scoped_allocator
View File

@@ -434,10 +434,10 @@ public:
piecewise_construct,
__transform_tuple(typename __uses_alloc_ctor< _T1, inner_allocator_type&, _Args1... >::type(),
std::move(__x),
typename __make_tuple_indices<sizeof...(_Args1)>::type{}),
__make_index_sequence<sizeof...(_Args1)>()),
__transform_tuple(typename __uses_alloc_ctor< _T2, inner_allocator_type&, _Args2... >::type(),
std::move(__y),
typename __make_tuple_indices<sizeof...(_Args2)>::type{}));
__make_index_sequence<sizeof...(_Args2)>()));
}
template <class _T1, class _T2>
@@ -503,20 +503,20 @@ private:
template <class... _Args, size_t... _Idx>
_LIBCPP_HIDE_FROM_ABI tuple<_Args&&...>
__transform_tuple(integral_constant<int, 0>, tuple<_Args...>&& __t, __tuple_indices<_Idx...>) {
__transform_tuple(integral_constant<int, 0>, tuple<_Args...>&& __t, __index_sequence<_Idx...>) {
return std::forward_as_tuple(std::get<_Idx>(std::move(__t))...);
}
template <class... _Args, size_t... _Idx>
_LIBCPP_HIDE_FROM_ABI tuple<allocator_arg_t, inner_allocator_type&, _Args&&...>
__transform_tuple(integral_constant<int, 1>, tuple<_Args...>&& __t, __tuple_indices<_Idx...>) {
__transform_tuple(integral_constant<int, 1>, tuple<_Args...>&& __t, __index_sequence<_Idx...>) {
using _Tup = tuple<allocator_arg_t, inner_allocator_type&, _Args&&...>;
return _Tup(allocator_arg, inner_allocator(), std::get<_Idx>(std::move(__t))...);
}
template <class... _Args, size_t... _Idx>
_LIBCPP_HIDE_FROM_ABI tuple<_Args&&..., inner_allocator_type&>
__transform_tuple(integral_constant<int, 2>, tuple<_Args...>&& __t, __tuple_indices<_Idx...>) {
__transform_tuple(integral_constant<int, 2>, tuple<_Args...>&& __t, __index_sequence<_Idx...>) {
using _Tup = tuple<_Args&&..., inner_allocator_type&>;
return _Tup(std::get<_Idx>(std::move(__t))..., inner_allocator());
}

113
libcxx/include/tuple
View File

@@ -229,7 +229,6 @@ template <class... Types>
# include <__tuple/make_tuple_types.h>
# include <__tuple/sfinae_helpers.h>
# include <__tuple/tuple_element.h>
# include <__tuple/tuple_indices.h>
# include <__tuple/tuple_like_ext.h>
# include <__tuple/tuple_size.h>
# include <__tuple/tuple_types.h>
@@ -457,15 +456,15 @@ struct __tuple_impl;
template <size_t... _Indx, class... _Tp>
struct _LIBCPP_DECLSPEC_EMPTY_BASES
__tuple_impl<__tuple_indices<_Indx...>, _Tp...> : public __tuple_leaf<_Indx, _Tp>... {
__tuple_impl<__index_sequence<_Indx...>, _Tp...> : public __tuple_leaf<_Indx, _Tp>... {
_LIBCPP_HIDE_FROM_ABI constexpr __tuple_impl() noexcept(
__all<is_nothrow_default_constructible<_Tp>::value...>::value) {}
template <size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl(
__tuple_indices<_Uf...>,
__index_sequence<_Uf...>,
__tuple_types<_Tf...>,
__tuple_indices<_Ul...>,
__index_sequence<_Ul...>,
__tuple_types<_Tl...>,
_Up&&... __u) noexcept(__all<is_nothrow_constructible<_Tf, _Up>::value...>::value &&
__all<is_nothrow_default_constructible<_Tl>::value...>::value)
@@ -475,9 +474,9 @@ struct _LIBCPP_DECLSPEC_EMPTY_BASES
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl(
allocator_arg_t,
const _Alloc& __a,
__tuple_indices<_Uf...>,
__index_sequence<_Uf...>,
__tuple_types<_Tf...>,
__tuple_indices<_Ul...>,
__index_sequence<_Ul...>,
__tuple_types<_Tl...>,
_Up&&... __u)
: __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, std::forward<_Up>(__u))...,
@@ -518,19 +517,19 @@ struct _LIBCPP_DECLSPEC_EMPTY_BASES
template <class _Dest, class _Source, size_t... _Np>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
__memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) {
__memberwise_copy_assign(_Dest& __dest, _Source const& __source, __index_sequence<_Np...>) {
std::__swallow(((std::get<_Np>(__dest) = std::get<_Np>(__source)), void(), 0)...);
}
template <class _Dest, class _Source, class... _Up, size_t... _Np>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
__memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) {
__memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __index_sequence<_Np...>) {
std::__swallow(((std::get<_Np>(__dest) = std::forward<_Up>(std::get<_Np>(__source))), void(), 0)...);
}
template <class... _Tp>
class _LIBCPP_NO_SPECIALIZATIONS tuple {
typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT;
typedef __tuple_impl<__make_index_sequence<sizeof...(_Tp)>, _Tp...> _BaseT;
_BaseT __base_;
@@ -568,9 +567,9 @@ public:
tuple(allocator_arg_t, _Alloc const& __a)
: __base_(allocator_arg_t(),
__a,
__tuple_indices<>(),
__index_sequence<>(),
__tuple_types<>(),
typename __make_tuple_indices<sizeof...(_Tp), 0>::type(),
__make_index_sequence<sizeof...(_Tp)>(),
__tuple_types<_Tp...>()) {}
// tuple(const T&...) constructors (including allocator_arg_t variants)
@@ -579,10 +578,10 @@ public:
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value)
tuple(const _Tp&... __t) noexcept(_And<is_nothrow_copy_constructible<_Tp>...>::value)
: __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
typename __make_tuple_indices<0>::type(),
typename __make_tuple_types<tuple, 0>::type(),
: __base_(__make_index_sequence<sizeof...(_Tp)>(),
__tuple_types<_Tp...>(),
__index_sequence<>(),
__tuple_types<>(),
__t...) {}
template <class _Alloc,
@@ -593,10 +592,10 @@ public:
tuple(allocator_arg_t, const _Alloc& __a, const _Tp&... __t)
: __base_(allocator_arg_t(),
__a,
typename __make_tuple_indices<sizeof...(_Tp)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
typename __make_tuple_indices<0>::type(),
typename __make_tuple_types<tuple, 0>::type(),
__make_index_sequence<sizeof...(_Tp)>(),
__tuple_types<_Tp...>(),
__index_sequence<>(),
__tuple_types<>(),
__t...) {}
// tuple(U&& ...) constructors (including allocator_arg_t variants)
@@ -616,10 +615,10 @@ public:
int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
tuple(_Up&&... __u) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value)
: __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
: __base_(__make_index_sequence<sizeof...(_Up)>(),
__tuple_types<_Tp...>(),
__index_sequence<>(),
__tuple_types<>(),
std::forward<_Up>(__u)...) {}
template <class _Alloc,
@@ -630,10 +629,10 @@ public:
tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u)
: __base_(allocator_arg_t(),
__a,
typename __make_tuple_indices<sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
__make_index_sequence<sizeof...(_Up)>(),
__tuple_types<_Tp...>(),
__index_sequence<>(),
__tuple_types<>(),
std::forward<_Up>(__u)...) {}
// Copy and move constructors (including the allocator_arg_t variants)
@@ -838,7 +837,7 @@ public:
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple) noexcept(
_And<is_nothrow_copy_assignable<_Tp>...>::value) {
std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type());
std::__memberwise_copy_assign(*this, __tuple, __make_index_sequence<sizeof...(_Tp)>());
return *this;
}
@@ -846,7 +845,7 @@ public:
_LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple const& __tuple) const
requires(_And<is_copy_assignable<const _Tp>...>::value)
{
std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type());
std::__memberwise_copy_assign(*this, __tuple, __make_index_sequence<sizeof...(_Tp)>());
return *this;
}
@@ -854,7 +853,7 @@ public:
requires(_And<is_assignable<const _Tp&, _Tp>...>::value)
{
std::__memberwise_forward_assign(
*this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
*this, std::move(__tuple), __tuple_types<_Tp...>(), __make_index_sequence<sizeof...(_Tp)>());
return *this;
}
# endif // _LIBCPP_STD_VER >= 23
@@ -863,7 +862,7 @@ public:
operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple) noexcept(
_And<is_nothrow_move_assignable<_Tp>...>::value) {
std::__memberwise_forward_assign(
*this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
*this, std::move(__tuple), __tuple_types<_Tp...>(), __make_index_sequence<sizeof...(_Tp)>());
return *this;
}
@@ -873,7 +872,7 @@ public:
int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
operator=(tuple<_Up...> const& __tuple) noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) {
std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type());
std::__memberwise_copy_assign(*this, __tuple, __make_index_sequence<sizeof...(_Tp)>());
return *this;
}
@@ -883,7 +882,7 @@ public:
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
operator=(tuple<_Up...>&& __tuple) noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) {
std::__memberwise_forward_assign(
*this, std::move(__tuple), __tuple_types<_Up...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
*this, std::move(__tuple), __tuple_types<_Up...>(), __make_index_sequence<sizeof...(_Tp)>());
return *this;
}
@@ -892,7 +891,7 @@ public:
enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>,
is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const tuple<_UTypes...>& __u) const {
std::__memberwise_copy_assign(*this, __u, typename __make_tuple_indices<sizeof...(_Tp)>::type());
std::__memberwise_copy_assign(*this, __u, __make_index_sequence<sizeof...(_Tp)>());
return *this;
}
@@ -900,8 +899,7 @@ public:
enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>,
is_assignable<const _Tp&, _UTypes>...>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple<_UTypes...>&& __u) const {
std::__memberwise_forward_assign(
*this, __u, __tuple_types<_UTypes...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
std::__memberwise_forward_assign(*this, __u, __tuple_types<_UTypes...>(), __make_index_sequence<sizeof...(_Tp)>());
return *this;
}
# endif // _LIBCPP_STD_VER >= 23
@@ -967,7 +965,7 @@ public:
__enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up const&>... >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
operator=(array<_Up, _Np> const& __array) noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) {
std::__memberwise_copy_assign(*this, __array, typename __make_tuple_indices<sizeof...(_Tp)>::type());
std::__memberwise_copy_assign(*this, __array, __make_index_sequence<sizeof...(_Tp)>());
return *this;
}
@@ -979,10 +977,7 @@ public:
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
operator=(array<_Up, _Np>&& __array) noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) {
std::__memberwise_forward_assign(
*this,
std::move(__array),
__tuple_types<_If<true, _Up, _Tp>...>(),
typename __make_tuple_indices<sizeof...(_Tp)>::type());
*this, std::move(__array), __tuple_types<_If<true, _Up, _Tp>...>(), __make_index_sequence<sizeof...(_Tp)>());
return *this;
}
@@ -1291,17 +1286,17 @@ template <class _Rp, class _Indices, class _Tuple0, class... _Tuples>
struct __tuple_cat_return_ref_imp;
template <class... _Types, size_t... _I0, class _Tuple0>
struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> {
struct __tuple_cat_return_ref_imp<tuple<_Types...>, __index_sequence<_I0...>, _Tuple0> {
using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>;
typedef tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_I0, _T0>::type>&&...> type;
};
template <class... _Types, size_t... _I0, class _Tuple0, class _Tuple1, class... _Tuples>
struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0, _Tuple1, _Tuples...>
struct __tuple_cat_return_ref_imp<tuple<_Types...>, __index_sequence<_I0...>, _Tuple0, _Tuple1, _Tuples...>
: public __tuple_cat_return_ref_imp<
tuple<_Types...,
__copy_cvref_t<_Tuple0, typename tuple_element<_I0, __libcpp_remove_reference_t<_Tuple0>>::type>&&...>,
typename __make_tuple_indices<tuple_size<__libcpp_remove_reference_t<_Tuple1> >::value>::type,
__make_index_sequence<tuple_size<__libcpp_remove_reference_t<_Tuple1> >::value>,
_Tuple1,
_Tuples...> {};
@@ -1309,7 +1304,7 @@ template <class _Tuple0, class... _Tuples>
struct __tuple_cat_return_ref
: public __tuple_cat_return_ref_imp<
tuple<>,
typename __make_tuple_indices< tuple_size<__libcpp_remove_reference_t<_Tuple0> >::value >::type,
__make_index_sequence< tuple_size<__libcpp_remove_reference_t<_Tuple0> >::value >,
_Tuple0,
_Tuples...> {};
@@ -1317,7 +1312,7 @@ template <class _Types, class _I0, class _J0>
struct __tuple_cat;
template <class... _Types, size_t... _I0, size_t... _J0>
struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > {
struct __tuple_cat<tuple<_Types...>, __index_sequence<_I0...>, __index_sequence<_J0...>> {
template <class _Tuple0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type
@@ -1335,8 +1330,8 @@ struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J
using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>;
using _T1 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple1>;
return __tuple_cat<tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_J0, _T0>::type>&&...>,
typename __make_tuple_indices<sizeof...(_Types) + tuple_size<_T0>::value>::type,
typename __make_tuple_indices<tuple_size<_T1>::value>::type>()(
__make_index_sequence<sizeof...(_Types) + tuple_size<_T0>::value>,
__make_index_sequence<tuple_size<_T1>::value>>()(
std::forward_as_tuple(
std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...),
std::forward<_Tuple1>(__t1),
@@ -1346,7 +1341,7 @@ struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J
template <class _TupleDst, class _TupleSrc, size_t... _Indices>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _TupleDst
__tuple_cat_select_element_wise(_TupleSrc&& __src, __tuple_indices<_Indices...>) {
__tuple_cat_select_element_wise(_TupleSrc&& __src, __index_sequence<_Indices...>) {
static_assert(tuple_size<_TupleDst>::value == tuple_size<_TupleSrc>::value,
"misuse of __tuple_cat_select_element_wise with tuples of different sizes");
return _TupleDst(std::get<_Indices>(std::forward<_TupleSrc>(__src))...);
@@ -1357,10 +1352,10 @@ inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename __tuple_cat_
tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) {
using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>;
using _TRet _LIBCPP_NODEBUG = typename __tuple_cat_return<_Tuple0, _Tuples...>::type;
using _T0Indices _LIBCPP_NODEBUG = typename __make_tuple_indices<tuple_size<_T0>::value>::type;
using _TRetIndices _LIBCPP_NODEBUG = typename __make_tuple_indices<tuple_size<_TRet>::value>::type;
using _T0Indices _LIBCPP_NODEBUG = __make_index_sequence<tuple_size<_T0>::value>;
using _TRetIndices _LIBCPP_NODEBUG = __make_index_sequence<tuple_size<_TRet>::value>;
return std::__tuple_cat_select_element_wise<_TRet>(
__tuple_cat<tuple<>, __tuple_indices<>, _T0Indices>()(
__tuple_cat<tuple<>, __index_sequence<>, _T0Indices>()(
tuple<>(), std::forward<_Tuple0>(__t0), std::forward<_Tuples>(__tpls)...),
_TRetIndices());
}
@@ -1376,7 +1371,7 @@ struct uses_allocator<tuple<_Tp...>, _Alloc> : true_type {};
// clang-format off
template <class _Fn, class _Tuple, size_t... _Id>
inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto)
__apply_tuple_impl(_Fn&& __f, _Tuple&& __t, __tuple_indices<_Id...>)
__apply_tuple_impl(_Fn&& __f, _Tuple&& __t, index_sequence<_Id...>)
_LIBCPP_NOEXCEPT_RETURN(std::__invoke(std::forward<_Fn>(__f), std::get<_Id>(std::forward<_Tuple>(__t))...))
template <class _Fn, class _Tuple>
@@ -1384,28 +1379,28 @@ inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) apply(_Fn&& __f, _Tuple&&
_LIBCPP_NOEXCEPT_RETURN(std::__apply_tuple_impl(
std::forward<_Fn>(__f),
std::forward<_Tuple>(__t),
typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}))
make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>()))
#if _LIBCPP_STD_VER >= 20
template <class _Tp, class _Tuple, size_t... _Idx>
inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>)
inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, index_sequence<_Idx...>)
noexcept(noexcept(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...)))
requires is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...> {
return _Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...);
}
#else
template <class _Tp, class _Tuple, size_t... _Idx>
inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>,
inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, index_sequence<_Idx...>,
enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...>> * = nullptr)
_LIBCPP_NOEXCEPT_RETURN(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...))
#endif // _LIBCPP_STD_VER >= 20
template <class _Tp, class _Tuple,
class _Seq = typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type, class = void>
class _Seq = make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>, class = void>
inline constexpr bool __can_make_from_tuple = false;
template <class _Tp, class _Tuple, size_t... _Idx>
inline constexpr bool __can_make_from_tuple<_Tp, _Tuple, __tuple_indices<_Idx...>,
inline constexpr bool __can_make_from_tuple<_Tp, _Tuple, index_sequence<_Idx...>,
enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::declval<_Tuple>()))...>>> = true;
// Based on LWG3528(https://wg21.link/LWG3528) and http://eel.is/c++draft/description#structure.requirements-9,
@@ -1420,7 +1415,7 @@ template <class _Tp, class _Tuple, class = enable_if_t<__can_make_from_tuple<_Tp
#endif // _LIBCPP_STD_VER >= 20
inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp make_from_tuple(_Tuple&& __t)
_LIBCPP_NOEXCEPT_RETURN(std::__make_from_tuple_impl<_Tp>(
std::forward<_Tuple>(__t), typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}))
std::forward<_Tuple>(__t), make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>()))
# undef _LIBCPP_NOEXCEPT_RETURN
# endif // _LIBCPP_STD_VER >= 17

4
libcxx/include/variant
View File

@@ -1127,14 +1127,14 @@ template <class _IdxSeq>
struct __make_overloads_imp;
template <size_t... _Idx>
struct __make_overloads_imp<__tuple_indices<_Idx...> > {
struct __make_overloads_imp<index_sequence<_Idx...> > {
template <class... _Types>
using _Apply _LIBCPP_NODEBUG = __all_overloads<__overload<_Types, _Idx>...>;
};
template <class... _Types>
using _MakeOverloads _LIBCPP_NODEBUG =
typename __make_overloads_imp< __make_indices_imp<sizeof...(_Types), 0> >::template _Apply<_Types...>;
typename __make_overloads_imp<make_index_sequence<sizeof...(_Types)>>::template _Apply<_Types...>;
template <class _Tp, class... _Types>
using __best_match_t _LIBCPP_NODEBUG = typename invoke_result_t<_MakeOverloads<_Types...>, _Tp, _Tp>::type;

2
libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp
View File

@@ -214,7 +214,7 @@ static constexpr bool can_make_from_tuple =
template <class T, class Tuple>
auto test_make_from_tuple_impl(T&&, Tuple&& t)
-> decltype(std::__make_from_tuple_impl<T>(
t, typename std::__make_tuple_indices< std::tuple_size_v<std::remove_reference_t<Tuple>>>::type{}),
t, typename std::make_index_sequence<std::tuple_size_v<std::remove_reference_t<Tuple>>>()),
std::uint8_t()) {
return 0;
}