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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) 2023-24 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCUDACXX___ITERATOR_DISTANCE_H
#define _LIBCUDACXX___ITERATOR_DISTANCE_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/concepts.h>
#include <cuda/std/__iterator/incrementable_traits.h>
#include <cuda/std/__iterator/iterator_traits.h>
#include <cuda/std/__ranges/access.h>
#include <cuda/std/__ranges/concepts.h>
#include <cuda/std/__ranges/size.h>
#include <cuda/std/__type_traits/decay.h>
#include <cuda/std/__type_traits/remove_cvref.h>
#include <cuda/std/__cccl/prologue.h>
_LIBCUDACXX_BEGIN_NAMESPACE_STD
_CCCL_EXEC_CHECK_DISABLE
template <class _InputIter>
[[nodiscard]] _CCCL_API constexpr typename iterator_traits<_InputIter>::difference_type
distance(_InputIter __first, _InputIter __last)
{
if constexpr (__has_random_access_traversal<_InputIter>) // To support pointers to incomplete types
{
return __last - __first;
}
else if constexpr (sized_sentinel_for<_InputIter, _InputIter>)
{
return __last - __first;
}
else
{
typename iterator_traits<_InputIter>::difference_type __r(0);
for (; __first != __last; ++__first)
{
++__r;
}
return __r;
}
}
_LIBCUDACXX_END_NAMESPACE_STD
// [range.iter.op.distance]
_LIBCUDACXX_BEGIN_NAMESPACE_RANGES
_LIBCUDACXX_BEGIN_NAMESPACE_CPO(__distance)
struct __fn
{
_CCCL_EXEC_CHECK_DISABLE
_CCCL_TEMPLATE(class _Ip, class _Sp)
_CCCL_REQUIRES((sentinel_for<_Sp, _Ip> && !sized_sentinel_for<_Sp, _Ip>) )
[[nodiscard]] _CCCL_API constexpr iter_difference_t<_Ip> operator()(_Ip __first, _Sp __last) const
{
iter_difference_t<_Ip> __n = 0;
while (__first != __last)
{
++__first;
++__n;
}
return __n;
}
_CCCL_EXEC_CHECK_DISABLE
_CCCL_TEMPLATE(class _Ip, class _Sp)
_CCCL_REQUIRES((sized_sentinel_for<_Sp, decay_t<_Ip>>) )
[[nodiscard]] _CCCL_API constexpr iter_difference_t<_Ip> operator()(_Ip&& __first, _Sp __last) const
{
if constexpr (sized_sentinel_for<_Sp, remove_cvref_t<_Ip>>)
{
return __last - __first;
}
else
{
return __last - decay_t<_Ip>(__first);
}
_CCCL_UNREACHABLE();
}
_CCCL_EXEC_CHECK_DISABLE
_CCCL_TEMPLATE(class _Rp)
_CCCL_REQUIRES((range<_Rp>) )
[[nodiscard]] _CCCL_API constexpr range_difference_t<_Rp> operator()(_Rp&& __r) const
{
if constexpr (sized_range<_Rp>)
{
return static_cast<range_difference_t<_Rp>>(_CUDA_VRANGES::size(__r));
}
else
{
return operator()(_CUDA_VRANGES::begin(__r), _CUDA_VRANGES::end(__r));
}
_CCCL_UNREACHABLE();
}
};
_LIBCUDACXX_END_NAMESPACE_CPO
inline namespace __cpo
{
_CCCL_GLOBAL_CONSTANT auto distance = __distance::__fn{};
} // namespace __cpo
_LIBCUDACXX_END_NAMESPACE_RANGES
#include <cuda/std/__cccl/epilogue.h>
#endif // _LIBCUDACXX___ITERATOR_DISTANCE_H
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