| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___PSTL_CPU_ALGOS_MERGE_H |
| #define _LIBCPP___PSTL_CPU_ALGOS_MERGE_H |
| |
| #include <__algorithm/merge.h> |
| #include <__config> |
| #include <__iterator/concepts.h> |
| #include <__pstl/configuration_fwd.h> |
| #include <__pstl/cpu_algos/cpu_traits.h> |
| #include <__type_traits/is_execution_policy.h> |
| #include <__utility/move.h> |
| #include <optional> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17 |
| |
| _LIBCPP_PUSH_MACROS |
| # include <__undef_macros> |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <class _ExecutionPolicy, |
| class _ForwardIterator1, |
| class _ForwardIterator2, |
| class _ForwardOutIterator, |
| class _Comp> |
| _LIBCPP_HIDE_FROM_ABI optional<_ForwardOutIterator> __pstl_merge( |
| __cpu_backend_tag, |
| _ForwardIterator1 __first1, |
| _ForwardIterator1 __last1, |
| _ForwardIterator2 __first2, |
| _ForwardIterator2 __last2, |
| _ForwardOutIterator __result, |
| _Comp __comp) { |
| if constexpr (__is_parallel_execution_policy_v<_ExecutionPolicy> && |
| __has_random_access_iterator_category_or_concept<_ForwardIterator1>::value && |
| __has_random_access_iterator_category_or_concept<_ForwardIterator2>::value && |
| __has_random_access_iterator_category_or_concept<_ForwardOutIterator>::value) { |
| auto __res = __pstl::__cpu_traits<__cpu_backend_tag>::__merge( |
| __first1, |
| __last1, |
| __first2, |
| __last2, |
| __result, |
| __comp, |
| [](_ForwardIterator1 __g_first1, |
| _ForwardIterator1 __g_last1, |
| _ForwardIterator2 __g_first2, |
| _ForwardIterator2 __g_last2, |
| _ForwardOutIterator __g_result, |
| _Comp __g_comp) { |
| [[maybe_unused]] auto __g_res = std::__pstl_merge<__remove_parallel_policy_t<_ExecutionPolicy>>( |
| __cpu_backend_tag{}, |
| std::move(__g_first1), |
| std::move(__g_last1), |
| std::move(__g_first2), |
| std::move(__g_last2), |
| std::move(__g_result), |
| std::move(__g_comp)); |
| _LIBCPP_ASSERT_INTERNAL(__g_res, "unsed/sed should never try to allocate!"); |
| }); |
| if (!__res) |
| return nullopt; |
| return __result + (__last1 - __first1) + (__last2 - __first2); |
| } else { |
| return std::merge(__first1, __last1, __first2, __last2, __result, __comp); |
| } |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17 |
| |
| #endif // _LIBCPP___PSTL_CPU_ALGOS_MERGE_H |