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___ALGORITHM_PSTL_IS_PARITTIONED
10#define _LIBCPP___ALGORITHM_PSTL_IS_PARITTIONED
11
12#include <__algorithm/pstl_any_all_none_of.h>
13#include <__algorithm/pstl_backend.h>
14#include <__algorithm/pstl_find.h>
15#include <__algorithm/pstl_frontend_dispatch.h>
16#include <__config>
17#include <__type_traits/enable_if.h>
18#include <__type_traits/is_execution_policy.h>
19#include <__type_traits/remove_cvref.h>
20#include <__utility/move.h>
21#include <optional>
22
23#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
24#  pragma GCC system_header
25#endif
26
27_LIBCPP_PUSH_MACROS
28#include <__undef_macros>
29
30#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
31
32_LIBCPP_BEGIN_NAMESPACE_STD
33
34template <class>
35void __pstl_is_partitioned();
36
37template <class _ExecutionPolicy,
38          class _ForwardIterator,
39          class _Predicate,
40          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
41          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
42[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<bool> __is_partitioned(
43    _ExecutionPolicy&& __policy, _ForwardIterator&& __first, _ForwardIterator&& __last, _Predicate&& __pred) {
44  return std::__pstl_frontend_dispatch(
45      _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_is_partitioned, _RawPolicy),
46      [&__policy](_ForwardIterator __g_first, _ForwardIterator __g_last, _Predicate __g_pred) {
47        __g_first = std::find_if_not(__policy, __g_first, __g_last, __g_pred);
48        if (__g_first == __g_last)
49          return true;
50        ++__g_first;
51        return std::none_of(__policy, __g_first, __g_last, __g_pred);
52      },
53      std::move(__first),
54      std::move(__last),
55      std::move(__pred));
56}
57
58template <class _ExecutionPolicy,
59          class _ForwardIterator,
60          class _Predicate,
61          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
62          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
63_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI bool
64is_partitioned(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
65  auto __res = std::__is_partitioned(__policy, std::move(__first), std::move(__last), std::move(__pred));
66  if (!__res)
67    std::__throw_bad_alloc();
68  return *std::move(__res);
69}
70
71_LIBCPP_END_NAMESPACE_STD
72
73#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
74
75_LIBCPP_POP_MACROS
76
77#endif // _LIBCPP___ALGORITHM_PSTL_IS_PARITTIONED
78