1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___TYPE_TRAITS_TYPE_LIST_H
10#define _LIBCPP___TYPE_TRAITS_TYPE_LIST_H
11
12#include <__config>
13#include <cstddef>
14
15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16#  pragma GCC system_header
17#endif
18
19_LIBCPP_BEGIN_NAMESPACE_STD
20
21template <class _Hp, class _Tp>
22struct __type_list
23{
24    typedef _Hp _Head;
25    typedef _Tp _Tail;
26};
27
28template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first;
29
30template <class _Hp, class _Tp, size_t _Size>
31struct __find_first<__type_list<_Hp, _Tp>, _Size, true>
32{
33    typedef _LIBCPP_NODEBUG _Hp type;
34};
35
36template <class _Hp, class _Tp, size_t _Size>
37struct __find_first<__type_list<_Hp, _Tp>, _Size, false>
38{
39    typedef _LIBCPP_NODEBUG typename __find_first<_Tp, _Size>::type type;
40};
41
42_LIBCPP_END_NAMESPACE_STD
43
44#endif // _LIBCPP___TYPE_TRAITS_TYPE_LIST_H
45