chromium/third_party/libc++/src/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/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_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;

__make_tuple_types_flat<_Tuple<_Types...>, __tuple_indices<_Idx...>>;

__make_tuple_types_flat<array<_Vt, _Np>, __tuple_indices<_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)>
struct __make_tuple_types { … };

__make_tuple_types<tuple<_Types...>, _Ep, 0, true>;

__make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true>;

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_CXX03_LANG

#endif // _LIBCPP___TUPLE_MAKE_TUPLE_TYPES_H