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 
22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
23 #  pragma GCC system_header
24 #endif
25 
26 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
27 
28 _LIBCPP_BEGIN_NAMESPACE_STD
29 
30 template <class>
31 void __pstl_is_partitioned();
32 
33 template <class _ExecutionPolicy,
34           class _ForwardIterator,
35           class _Predicate,
36           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
37           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
38 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI bool
39 is_partitioned(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
40   return std::__pstl_frontend_dispatch(
41       _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_is_partitioned),
42       [&__policy](_ForwardIterator __g_first, _ForwardIterator __g_last, _Predicate __g_pred) {
43         __g_first = std::find_if_not(__policy, __g_first, __g_last, __g_pred);
44         if (__g_first == __g_last)
45           return true;
46         ++__g_first;
47         return std::none_of(__policy, __g_first, __g_last, __g_pred);
48       },
49       std::move(__first),
50       std::move(__last),
51       std::move(__pred));
52 }
53 
54 _LIBCPP_END_NAMESPACE_STD
55 
56 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
57 
58 #endif // _LIBCPP___ALGORITHM_PSTL_IS_PARITTIONED
59