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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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___ITERATOR_PREV_H
#define _LIBCUDACXX___ITERATOR_PREV_H
#include <cuda/std/detail/__config>
#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
#include <cuda/std/__iterator/advance.h>
#include <cuda/std/__iterator/concepts.h>
#include <cuda/std/__iterator/incrementable_traits.h>
#include <cuda/std/__iterator/iterator_traits.h>
#include <cuda/std/__type_traits/enable_if.h>
#include <cuda/std/__cccl/prologue.h>
_LIBCUDACXX_BEGIN_NAMESPACE_STD
_CCCL_TEMPLATE(class _InputIter)
_CCCL_REQUIRES(__has_input_traversal<_InputIter>)
[[nodiscard]] _CCCL_API constexpr _InputIter
prev(_InputIter __x, typename iterator_traits<_InputIter>::difference_type __n = 1)
{
_CCCL_ASSERT(__n <= 0 || __has_bidirectional_traversal<_InputIter>, "Attempt to prev(it, +n) on a non-bidi iterator");
_CUDA_VSTD::advance(__x, -__n);
return __x;
}
_LIBCUDACXX_END_NAMESPACE_STD
// [range.iter.op.prev]
_LIBCUDACXX_BEGIN_NAMESPACE_RANGES
_LIBCUDACXX_BEGIN_NAMESPACE_CPO(__prev)
struct __fn
{
_CCCL_EXEC_CHECK_DISABLE
_CCCL_TEMPLATE(class _Ip)
_CCCL_REQUIRES(bidirectional_iterator<_Ip>)
[[nodiscard]] _CCCL_API constexpr _Ip operator()(_Ip __x) const
{
--__x;
return __x;
}
_CCCL_EXEC_CHECK_DISABLE
_CCCL_TEMPLATE(class _Ip)
_CCCL_REQUIRES(bidirectional_iterator<_Ip>)
[[nodiscard]] _CCCL_API constexpr _Ip operator()(_Ip __x, iter_difference_t<_Ip> __n) const
{
_CUDA_VRANGES::advance(__x, -__n);
return __x;
}
_CCCL_EXEC_CHECK_DISABLE
_CCCL_TEMPLATE(class _Ip)
_CCCL_REQUIRES(bidirectional_iterator<_Ip>)
[[nodiscard]] _CCCL_API constexpr _Ip operator()(_Ip __x, iter_difference_t<_Ip> __n, _Ip __bound_iter) const
{
_CUDA_VRANGES::advance(__x, -__n, __bound_iter);
return __x;
}
};
_LIBCUDACXX_END_NAMESPACE_CPO
inline namespace __cpo
{
_CCCL_GLOBAL_CONSTANT auto prev = __prev::__fn{};
} // namespace __cpo
_LIBCUDACXX_END_NAMESPACE_RANGES
#include <cuda/std/__cccl/epilogue.h>
#endif // _LIBCUDACXX___ITERATOR_PREV_H
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