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60 lines
2.0 KiB
60 lines
2.0 KiB
11 years ago
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/*
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* Copyright 2008-2012 NVIDIA Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <thrust/detail/config.h>
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#include <thrust/system/detail/generic/tabulate.h>
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#include <thrust/iterator/iterator_traits.h>
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#include <thrust/transform.h>
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#include <thrust/distance.h>
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#include <thrust/iterator/counting_iterator.h>
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namespace thrust
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{
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namespace system
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{
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namespace detail
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{
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namespace generic
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{
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template<typename DerivedPolicy,
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typename ForwardIterator,
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typename UnaryOperation>
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void tabulate(thrust::execution_policy<DerivedPolicy> &exec,
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ForwardIterator first,
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ForwardIterator last,
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UnaryOperation unary_op)
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{
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typedef typename iterator_difference<ForwardIterator>::type difference_type;
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// by default, counting_iterator uses a 64b difference_type on 32b platforms to avoid overflowing its counter.
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// this causes problems when a zip_iterator is created in transform's implementation -- ForwardIterator is
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// incremented by a 64b difference_type and some compilers warn
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// to avoid this, specify the counting_iterator's difference_type to be the same as ForwardIterator's.
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thrust::counting_iterator<difference_type, thrust::use_default, thrust::use_default, difference_type> iter(0);
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thrust::transform(exec, iter, iter + thrust::distance(first, last), first, unary_op);
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} // end tabulate()
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} // end namespace generic
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} // end namespace detail
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} // end namespace system
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} // end namespace thrust
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