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/******************************************************************************
* Copyright (c) 2011, Duane Merrill. All rights reserved.
* Copyright (c) 2011-2018, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the NVIDIA CORPORATION nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************/
/**
* \file
* Random-access iterator types
*/
#pragma once
#include <iterator>
#include <iostream>
#include "../config.cuh"
#if (THRUST_VERSION >= 100700)
// This iterator is compatible with Thrust API 1.7 and newer
#include <thrust/iterator/iterator_facade.h>
#include <thrust/iterator/iterator_traits.h>
#endif // THRUST_VERSION
/// Optional outer namespace(s)
CUB_NS_PREFIX
/// CUB namespace
namespace cub {
/**
* \addtogroup UtilIterator
* @{
*/
/**
* \brief A discard iterator
*/
template <typename OffsetT = ptrdiff_t>
class DiscardOutputIterator
{
public:
// Required iterator traits
typedef DiscardOutputIterator self_type; ///< My own type
typedef OffsetT difference_type; ///< Type to express the result of subtracting one iterator from another
typedef void value_type; ///< The type of the element the iterator can point to
typedef void pointer; ///< The type of a pointer to an element the iterator can point to
typedef void reference; ///< The type of a reference to an element the iterator can point to
#if (THRUST_VERSION >= 100700)
// Use Thrust's iterator categories so we can use these iterators in Thrust 1.7 (or newer) methods
typedef typename thrust::detail::iterator_facade_category<
thrust::any_system_tag,
thrust::random_access_traversal_tag,
value_type,
reference
>::type iterator_category; ///< The iterator category
#else
typedef std::random_access_iterator_tag iterator_category; ///< The iterator category
#endif // THRUST_VERSION
private:
OffsetT offset;
#if defined(_WIN32) || !defined(_WIN64)
// Workaround for win32 parameter-passing bug (ulonglong2 argmin DeviceReduce)
OffsetT pad[CUB_MAX(1, (16 / sizeof(OffsetT) - 1))];
#endif
public:
/// Constructor
__host__ __device__ __forceinline__ DiscardOutputIterator(
OffsetT offset = 0) ///< Base offset
:
offset(offset)
{}
/// Postfix increment
__host__ __device__ __forceinline__ self_type operator++(int)
{
self_type retval = *this;
offset++;
return retval;
}
/// Prefix increment
__host__ __device__ __forceinline__ self_type operator++()
{
offset++;
return *this;
}
/// Indirection
__host__ __device__ __forceinline__ self_type& operator*()
{
// return self reference, which can be assigned to anything
return *this;
}
/// Addition
template <typename Distance>
__host__ __device__ __forceinline__ self_type operator+(Distance n) const
{
self_type retval(offset + n);
return retval;
}
/// Addition assignment
template <typename Distance>
__host__ __device__ __forceinline__ self_type& operator+=(Distance n)
{
offset += n;
return *this;
}
/// Subtraction
template <typename Distance>
__host__ __device__ __forceinline__ self_type operator-(Distance n) const
{
self_type retval(offset - n);
return retval;
}
/// Subtraction assignment
template <typename Distance>
__host__ __device__ __forceinline__ self_type& operator-=(Distance n)
{
offset -= n;
return *this;
}
/// Distance
__host__ __device__ __forceinline__ difference_type operator-(self_type other) const
{
return offset - other.offset;
}
/// Array subscript
template <typename Distance>
__host__ __device__ __forceinline__ self_type& operator[](Distance n)
{
// return self reference, which can be assigned to anything
return *this;
}
/// Structure dereference
__host__ __device__ __forceinline__ pointer operator->()
{
return;
}
/// Assignment to self (no-op)
__host__ __device__ __forceinline__ void operator=(self_type const& other)
{
offset = other.offset;
}
/// Assignment to anything else (no-op)
template<typename T>
__host__ __device__ __forceinline__ void operator=(T const&)
{}
/// Cast to void* operator
__host__ __device__ __forceinline__ operator void*() const { return NULL; }
/// Equal to
__host__ __device__ __forceinline__ bool operator==(const self_type& rhs)
{
return (offset == rhs.offset);
}
/// Not equal to
__host__ __device__ __forceinline__ bool operator!=(const self_type& rhs)
{
return (offset != rhs.offset);
}
/// ostream operator
friend std::ostream& operator<<(std::ostream& os, const self_type& itr)
{
os << "[" << itr.offset << "]";
return os;
}
};
/** @} */ // end group UtilIterator
} // CUB namespace
CUB_NS_POSTFIX // Optional outer namespace(s)
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