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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 remove.h
* \brief Sequential implementations of remove functions.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/detail/function.h>
#include <thrust/system/detail/sequential/execution_policy.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace sequential
{
__thrust_exec_check_disable__
template<typename DerivedPolicy,
typename ForwardIterator,
typename Predicate>
__host__ __device__
ForwardIterator remove_if(sequential::execution_policy<DerivedPolicy> &,
ForwardIterator first,
ForwardIterator last,
Predicate pred)
{
// wrap pred
thrust::detail::wrapped_function<
Predicate,
bool
> wrapped_pred(pred);
// advance iterators until wrapped_pred(*first) is true or we reach the end of input
while(first != last && !wrapped_pred(*first))
++first;
if(first == last)
return first;
// result always trails first
ForwardIterator result = first;
++first;
while(first != last)
{
if(!wrapped_pred(*first))
{
*result = *first;
++result;
}
++first;
}
return result;
}
__thrust_exec_check_disable__
template<typename DerivedPolicy,
typename ForwardIterator,
typename InputIterator,
typename Predicate>
__host__ __device__
ForwardIterator remove_if(sequential::execution_policy<DerivedPolicy> &,
ForwardIterator first,
ForwardIterator last,
InputIterator stencil,
Predicate pred)
{
// wrap pred
thrust::detail::wrapped_function<
Predicate,
bool
> wrapped_pred(pred);
// advance iterators until wrapped_pred(*stencil) is true or we reach the end of input
while(first != last && !wrapped_pred(*stencil))
{
++first;
++stencil;
}
if(first == last)
return first;
// result always trails first
ForwardIterator result = first;
++first;
++stencil;
while(first != last)
{
if(!wrapped_pred(*stencil))
{
*result = *first;
++result;
}
++first;
++stencil;
}
return result;
}
__thrust_exec_check_disable__
template<typename DerivedPolicy,
typename InputIterator,
typename OutputIterator,
typename Predicate>
__host__ __device__
OutputIterator remove_copy_if(sequential::execution_policy<DerivedPolicy> &,
InputIterator first,
InputIterator last,
OutputIterator result,
Predicate pred)
{
// wrap pred
thrust::detail::wrapped_function<
Predicate,
bool
> wrapped_pred(pred);
while (first != last)
{
if (!wrapped_pred(*first))
{
*result = *first;
++result;
}
++first;
}
return result;
}
__thrust_exec_check_disable__
template<typename DerivedPolicy,
typename InputIterator1,
typename InputIterator2,
typename OutputIterator,
typename Predicate>
__host__ __device__
OutputIterator remove_copy_if(sequential::execution_policy<DerivedPolicy> &,
InputIterator1 first,
InputIterator1 last,
InputIterator2 stencil,
OutputIterator result,
Predicate pred)
{
// wrap pred
thrust::detail::wrapped_function<
Predicate,
bool
> wrapped_pred(pred);
while (first != last)
{
if (!wrapped_pred(*stencil))
{
*result = *first;
++result;
}
++first;
++stencil;
}
return result;
}
} // end namespace sequential
} // end namespace detail
} // end namespace system
THRUST_NAMESPACE_END
|
