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501e3f2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | // -*- 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
#ifndef __cuda_std__
#include <__config>
#endif // __cuda_std__
#include "../__assert"
#include "../__iterator/advance.h"
#include "../__iterator/iterator_traits.h"
#include "../__type_traits/enable_if.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 _InputIter>
inline _LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_CONSTEXPR_AFTER_CXX14
__enable_if_t
<
__is_cpp17_input_iterator<_InputIter>::value,
_InputIter
>
prev(_InputIter __x,
typename iterator_traits<_InputIter>::difference_type __n = 1)
{
_LIBCUDACXX_ASSERT(__n <= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value,
"Attempt to prev(it, +n) on a non-bidi iterator");
_CUDA_VSTD::advance(__x, -__n);
return __x;
}
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___ITERATOR_PREV_H
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