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//===----------------------------------------------------------------------===//
//
// 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___ALGORITHM_PSTL_BACKENDS_CPU_BACKENDS_MERGE_H
#define _LIBCPP___ALGORITHM_PSTL_BACKENDS_CPU_BACKENDS_MERGE_H
#include <__algorithm/merge.h>
#include <__algorithm/pstl_backends/cpu_backends/backend.h>
#include <__config>
#include <__iterator/concepts.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>::__parallel_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___ALGORITHM_PSTL_BACKENDS_CPU_BACKENDS_MERGE_H
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