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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/tabulate.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/transform.h>
#include <thrust/distance.h>
#include <thrust/iterator/counting_iterator.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace generic
{
template<typename DerivedPolicy,
typename ForwardIterator,
typename UnaryOperation>
__host__ __device__
void tabulate(thrust::execution_policy<DerivedPolicy> &exec,
ForwardIterator first,
ForwardIterator last,
UnaryOperation unary_op)
{
typedef typename iterator_difference<ForwardIterator>::type difference_type;
// by default, counting_iterator uses a 64b difference_type on 32b platforms to avoid overflowing its counter.
// this causes problems when a zip_iterator is created in transform's implementation -- ForwardIterator is
// incremented by a 64b difference_type and some compilers warn
// to avoid this, specify the counting_iterator's difference_type to be the same as ForwardIterator's.
thrust::counting_iterator<difference_type, thrust::use_default, thrust::use_default, difference_type> iter(0);
thrust::transform(exec, iter, iter + thrust::distance(first, last), first, unary_op);
} // end tabulate()
} // end namespace generic
} // end namespace detail
} // end namespace system
THRUST_NAMESPACE_END
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