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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/detail/static_assert.h>
#include <thrust/distance.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/distance.h>
#include <thrust/system/detail/sequential/execution_policy.h>
#include <tbb/blocked_range.h>
#include <tbb/parallel_for.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace tbb
{
namespace detail
{
namespace for_each_detail
{
template<typename RandomAccessIterator,
typename Size,
typename UnaryFunction>
struct body
{
RandomAccessIterator m_first;
UnaryFunction m_f;
body(RandomAccessIterator first, UnaryFunction f)
: m_first(first), m_f(f)
{}
void operator()(const ::tbb::blocked_range<Size> &r) const
{
// we assume that blocked_range specifies a contiguous range of integers
thrust::for_each_n(thrust::system::detail::sequential::seq, m_first + r.begin(), r.size(), m_f);
} // end operator()()
}; // end body
template<typename Size, typename RandomAccessIterator, typename UnaryFunction>
body<RandomAccessIterator,Size,UnaryFunction>
make_body(RandomAccessIterator first, UnaryFunction f)
{
return body<RandomAccessIterator,Size,UnaryFunction>(first, f);
} // end make_body()
} // end for_each_detail
template<typename DerivedPolicy,
typename RandomAccessIterator,
typename Size,
typename UnaryFunction>
RandomAccessIterator for_each_n(execution_policy<DerivedPolicy> &,
RandomAccessIterator first,
Size n,
UnaryFunction f)
{
::tbb::parallel_for(::tbb::blocked_range<Size>(0,n), for_each_detail::make_body<Size>(first,f));
// return the end of the range
return first + n;
} // end for_each_n
template<typename DerivedPolicy,
typename RandomAccessIterator,
typename UnaryFunction>
RandomAccessIterator for_each(execution_policy<DerivedPolicy> &s,
RandomAccessIterator first,
RandomAccessIterator last,
UnaryFunction f)
{
return tbb::detail::for_each_n(s, first, thrust::distance(first,last), f);
} // end for_each()
} // end namespace detail
} // end namespace tbb
} // end namespace system
THRUST_NAMESPACE_END
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