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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.
*/
/*! \file unique.h
* \brief Sequential implementations of unique algorithms.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/system/detail/sequential/execution_policy.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/pair.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace sequential
{
__thrust_exec_check_disable__
template<typename DerivedPolicy,
typename InputIterator,
typename OutputIterator,
typename BinaryPredicate>
__host__ __device__
OutputIterator unique_copy(sequential::execution_policy<DerivedPolicy> &,
InputIterator first,
InputIterator last,
OutputIterator output,
BinaryPredicate binary_pred)
{
typedef typename thrust::iterator_traits<InputIterator>::value_type T;
if(first != last)
{
T prev = *first;
for(++first; first != last; ++first)
{
T temp = *first;
if (!binary_pred(prev, temp))
{
*output = prev;
++output;
prev = temp;
}
}
*output = prev;
++output;
}
return output;
} // end unique_copy()
template<typename DerivedPolicy,
typename ForwardIterator,
typename BinaryPredicate>
__host__ __device__
ForwardIterator unique(sequential::execution_policy<DerivedPolicy> &exec,
ForwardIterator first,
ForwardIterator last,
BinaryPredicate binary_pred)
{
// sequential unique_copy permits in-situ operation
return sequential::unique_copy(exec, first, last, first, binary_pred);
} // end unique()
template<typename DerivedPolicy,
typename ForwardIterator,
typename BinaryPredicate>
__host__ __device__
typename thrust::iterator_traits<ForwardIterator>::difference_type
unique_count(sequential::execution_policy<DerivedPolicy> &,
ForwardIterator first,
ForwardIterator last,
BinaryPredicate binary_pred)
{
typedef typename thrust::iterator_traits<ForwardIterator>::value_type T;
typename thrust::iterator_traits<ForwardIterator>::difference_type count{};
if(first != last)
{
count++;
T prev = *first;
for(++first; first != last; ++first)
{
T temp = *first;
if (!binary_pred(prev, temp))
{
count++;
prev = temp;
}
}
}
return count;
} // end unique()
} // end namespace sequential
} // end namespace detail
} // end namespace system
THRUST_NAMESPACE_END
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