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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
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCUDACXX___FUNCTIONAL_DEFAULT_SEARCHER_H
#define _LIBCUDACXX___FUNCTIONAL_DEFAULT_SEARCHER_H
#ifndef __cuda_std__
#include <__config>
#endif // __cuda_std__
// #include "../__algorithm/search.h"
#include "../__functional/identity.h"
#include "../__functional/operations.h"
#include "../__iterator/iterator_traits.h"
#include "../__utility/pair.h"
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
_LIBCUDACXX_BEGIN_NAMESPACE_STD
template <class _BinaryPredicate, class _ForwardIterator1, class _ForwardIterator2>
_LIBCUDACXX_HOST_DEVICE _LIBCUDACXX_CONSTEXPR_AFTER_CXX11
pair<_ForwardIterator1, _ForwardIterator1>
__search(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
_ForwardIterator2 __first2, _ForwardIterator2 __last2, _BinaryPredicate __pred,
forward_iterator_tag, forward_iterator_tag)
{
if (__first2 == __last2)
return _CUDA_VSTD::make_pair(__first1, __first1); // Everything matches an empty sequence
while (true)
{
// Find first element in sequence 1 that matchs *__first2, with a mininum of loop checks
while (true)
{
if (__first1 == __last1) // return __last1 if no element matches *__first2
return _CUDA_VSTD::make_pair(__last1, __last1);
if (__pred(*__first1, *__first2))
break;
++__first1;
}
// *__first1 matches *__first2, now match elements after here
_ForwardIterator1 __m1 = __first1;
_ForwardIterator2 __m2 = __first2;
while (true)
{
if (++__m2 == __last2) // If pattern exhausted, __first1 is the answer (works for 1 element pattern)
return _CUDA_VSTD::make_pair(__first1, __m1);
if (++__m1 == __last1) // Otherwise if source exhaused, pattern not found
return _CUDA_VSTD::make_pair(__last1, __last1);
if (!__pred(*__m1, *__m2)) // if there is a mismatch, restart with a new __first1
{
++__first1;
break;
} // else there is a match, check next elements
}
}
}
template <class _BinaryPredicate, class _RandomAccessIterator1, class _RandomAccessIterator2>
_LIBCUDACXX_HOST_DEVICE _LIBCUDACXX_CONSTEXPR_AFTER_CXX11
pair<_RandomAccessIterator1, _RandomAccessIterator1>
__search(_RandomAccessIterator1 __first1, _RandomAccessIterator1 __last1,
_RandomAccessIterator2 __first2, _RandomAccessIterator2 __last2, _BinaryPredicate __pred,
random_access_iterator_tag, random_access_iterator_tag)
{
typedef typename iterator_traits<_RandomAccessIterator1>::difference_type _Diff1;
typedef typename iterator_traits<_RandomAccessIterator2>::difference_type _Diff2;
// Take advantage of knowing source and pattern lengths. Stop short when source is smaller than pattern
const _Diff2 __len2 = __last2 - __first2;
if (__len2 == 0)
return _CUDA_VSTD::make_pair(__first1, __first1);
const _Diff1 __len1 = __last1 - __first1;
if (__len1 < __len2)
return _CUDA_VSTD::make_pair(__last1, __last1);
const _RandomAccessIterator1 __s = __last1 - (__len2 - 1); // Start of pattern match can't go beyond here
while (true)
{
while (true)
{
if (__first1 == __s)
return _CUDA_VSTD::make_pair(__last1, __last1);
if (__pred(*__first1, *__first2))
break;
++__first1;
}
_RandomAccessIterator1 __m1 = __first1;
_RandomAccessIterator2 __m2 = __first2;
while (true)
{
if (++__m2 == __last2)
return _CUDA_VSTD::make_pair(__first1, __first1 + __len2);
++__m1; // no need to check range on __m1 because __s guarantees we have enough source
if (!__pred(*__m1, *__m2))
{
++__first1;
break;
}
}
}
}
#ifndef __cuda_std__
#if _LIBCUDACXX_STD_VER > 14
// default searcher
template<class _ForwardIterator, class _BinaryPredicate = equal_to<>>
class _LIBCUDACXX_TEMPLATE_VIS default_searcher {
public:
_LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_CONSTEXPR_AFTER_CXX17
default_searcher(_ForwardIterator __f, _ForwardIterator __l,
_BinaryPredicate __p = _BinaryPredicate())
: __first_(__f), __last_(__l), __pred_(__p) {}
template <typename _ForwardIterator2>
_LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_CONSTEXPR_AFTER_CXX17
pair<_ForwardIterator2, _ForwardIterator2>
operator () (_ForwardIterator2 __f, _ForwardIterator2 __l) const
{
return _CUDA_VSTD::__search(__f, __l, __first_, __last_, __pred_,
typename _CUDA_VSTD::iterator_traits<_ForwardIterator>::iterator_category(),
typename _CUDA_VSTD::iterator_traits<_ForwardIterator2>::iterator_category());
}
private:
_ForwardIterator __first_;
_ForwardIterator __last_;
_BinaryPredicate __pred_;
};
_LIBCUDACXX_CTAD_SUPPORTED_FOR_TYPE(default_searcher);
#endif // _LIBCUDACXX_STD_VER > 14
#endif // __cuda_std__
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___FUNCTIONAL_DEFAULT_SEARCHER_H
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