libcxx/include/__algorithm/pstl_is_partitioned.h

   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 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
  28
  29 _LIBCPP_BEGIN_NAMESPACE_STD
  30
  31 template <class>
  32 void __pstl_is_partitioned();
  33
  34 template <class _ExecutionPolicy,
  35           class _ForwardIterator,
  36           class _Predicate,
  37           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
  38           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
  39 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<bool> __is_partitioned(
  40     _ExecutionPolicy&& __policy, _ForwardIterator&& __first, _ForwardIterator&& __last, _Predicate&& __pred) {
  41   return std::__pstl_frontend_dispatch(
  42       _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_is_partitioned, _RawPolicy),
  43       [&__policy](_ForwardIterator __g_first, _ForwardIterator __g_last, _Predicate __g_pred) {
  44         __g_first = std::find_if_not(__policy, __g_first, __g_last, __g_pred);
  45         if (__g_first == __g_last)
  46           return true;
  47         ++__g_first;
  48         return std::none_of(__policy, __g_first, __g_last, __g_pred);
  49       },
  50       std::move(__first),
  51       std::move(__last),
  52       std::move(__pred));
  53 }
  54
  55 template <class _ExecutionPolicy,
  56           class _ForwardIterator,
  57           class _Predicate,
  58           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
  59           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
  60 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI bool
  61 is_partitioned(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
  62   auto __res = std::__is_partitioned(__policy, std::move(__first), std::move(__last), std::move(__pred));
  63   if (!__res)
  64     std::__throw_bad_alloc();
  65   return *std::move(__res);
  66 }
  67
  68 _LIBCPP_END_NAMESPACE_STD
  69
  70 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
  71
  72 #endif // _LIBCPP___ALGORITHM_PSTL_IS_PARITTIONED