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/*
* Copyright 2008-2013 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/system/detail/generic/adjacent_difference.h>
#include <thrust/adjacent_difference.h>
#include <thrust/functional.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/detail/temporary_array.h>
#include <thrust/transform.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace generic
{
template<typename DerivedPolicy, typename InputIterator, typename OutputIterator>
__host__ __device__
OutputIterator adjacent_difference(thrust::execution_policy<DerivedPolicy> &exec,
InputIterator first, InputIterator last,
OutputIterator result)
{
typedef typename thrust::iterator_traits<InputIterator>::value_type InputType;
thrust::minus<InputType> binary_op;
return thrust::adjacent_difference(exec, first, last, result, binary_op);
} // end adjacent_difference()
template<typename DerivedPolicy, typename InputIterator, typename OutputIterator, typename BinaryFunction>
__host__ __device__
OutputIterator adjacent_difference(thrust::execution_policy<DerivedPolicy> &exec,
InputIterator first, InputIterator last,
OutputIterator result,
BinaryFunction binary_op)
{
typedef typename thrust::iterator_traits<InputIterator>::value_type InputType;
if(first == last)
{
// empty range, nothing to do
return result;
}
else
{
// an in-place operation is requested, copy the input and call the entry point
// XXX a special-purpose kernel would be faster here since
// only block boundaries need to be copied
thrust::detail::temporary_array<InputType, DerivedPolicy> input_copy(exec, first, last);
*result = *first;
thrust::transform(exec, input_copy.begin() + 1, input_copy.end(), input_copy.begin(), result + 1, binary_op);
}
return result + (last - first);
}
} // end namespace generic
} // end namespace detail
} // end namespace system
THRUST_NAMESPACE_END
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