libcxx/include/__algorithm/pstl_find.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_FIND_H
  10 #define _LIBCPP___ALGORITHM_PSTL_FIND_H
  11
  12 #include <__algorithm/comp.h>
  13 #include <__algorithm/find.h>
  14 #include <__algorithm/pstl_backend.h>
  15 #include <__algorithm/pstl_frontend_dispatch.h>
  16 #include <__config>
  17 #include <__iterator/cpp17_iterator_concepts.h>
  18 #include <__type_traits/enable_if.h>
  19 #include <__type_traits/is_execution_policy.h>
  20 #include <__type_traits/remove_cvref.h>
  21 #include <__utility/move.h>
  22 #include <optional>
  23
  24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  25 #  pragma GCC system_header
  26 #endif
  27
  28 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
  29
  30 _LIBCPP_BEGIN_NAMESPACE_STD
  31
  32 template <class _ExecutionPolicy,
  33           class _ForwardIterator,
  34           class _Predicate,
  35           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
  36           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
  37 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__remove_cvref_t<_ForwardIterator>>
  38 __find_if(_ExecutionPolicy&&, _ForwardIterator&& __first, _ForwardIterator&& __last, _Predicate&& __pred) noexcept {
  39   using _Backend = typename __select_backend<_RawPolicy>::type;
  40   return std::__pstl_find_if<_RawPolicy>(_Backend{}, std::move(__first), std::move(__last), std::move(__pred));
  41 }
  42
  43 template <class _ExecutionPolicy,
  44           class _ForwardIterator,
  45           class _Predicate,
  46           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
  47           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
  48 _LIBCPP_HIDE_FROM_ABI _ForwardIterator
  49 find_if(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
  50   _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
  51   auto __res = std::__find_if(__policy, std::move(__first), std::move(__last), std::move(__pred));
  52   if (!__res)
  53     std::__throw_bad_alloc();
  54   return *std::move(__res);
  55 }
  56
  57 template <class>
  58 void __pstl_find_if_not();
  59
  60 template <class _ExecutionPolicy,
  61           class _ForwardIterator,
  62           class _Predicate,
  63           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
  64           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
  65 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__remove_cvref_t<_ForwardIterator>>
  66 __find_if_not(_ExecutionPolicy&& __policy, _ForwardIterator&& __first, _ForwardIterator&& __last, _Predicate&& __pred) {
  67   return std::__pstl_frontend_dispatch(
  68       _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_find_if_not, _RawPolicy),
  69       [&](_ForwardIterator&& __g_first, _ForwardIterator&& __g_last, _Predicate&& __g_pred)
  70           -> optional<__remove_cvref_t<_ForwardIterator>> {
  71         return std::__find_if(
  72             __policy, __g_first, __g_last, [&](__iter_reference<__remove_cvref_t<_ForwardIterator>> __value) {
  73               return !__g_pred(__value);
  74             });
  75       },
  76       std::move(__first),
  77       std::move(__last),
  78       std::move(__pred));
  79 }
  80
  81 template <class _ExecutionPolicy,
  82           class _ForwardIterator,
  83           class _Predicate,
  84           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
  85           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
  86 _LIBCPP_HIDE_FROM_ABI _ForwardIterator
  87 find_if_not(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
  88   _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
  89   auto __res = std::__find_if_not(__policy, std::move(__first), std::move(__last), std::move(__pred));
  90   if (!__res)
  91     std::__throw_bad_alloc();
  92   return *std::move(__res);
  93 }
  94
  95 template <class>
  96 void __pstl_find();
  97
  98 template <class _ExecutionPolicy,
  99           class _ForwardIterator,
 100           class _Tp,
 101           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
 102           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
 103 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__remove_cvref_t<_ForwardIterator>>
 104 __find(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) noexcept {
 105   return std::__pstl_frontend_dispatch(
 106       _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_find, _RawPolicy),
 107       [&](_ForwardIterator __g_first, _ForwardIterator __g_last, const _Tp& __g_value) -> optional<_ForwardIterator> {
 108         return std::find_if(
 109             __policy, __g_first, __g_last, [&](__iter_reference<__remove_cvref_t<_ForwardIterator>> __element) {
 110               return __element == __g_value;
 111             });
 112       },
 113       std::move(__first),
 114       std::move(__last),
 115       __value);
 116 }
 117
 118 template <class _ExecutionPolicy,
 119           class _ForwardIterator,
 120           class _Tp,
 121           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
 122           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
 123 _LIBCPP_HIDE_FROM_ABI _ForwardIterator
 124 find(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) {
 125   _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
 126   auto __res = std::__find(__policy, std::move(__first), std::move(__last), __value);
 127   if (!__res)
 128     std::__throw_bad_alloc();
 129   return *std::move(__res);
 130 }
 131
 132 _LIBCPP_END_NAMESPACE_STD
 133
 134 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
 135
 136 #endif // _LIBCPP___ALGORITHM_PSTL_FIND_H