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126 lines
5.1 KiB
126 lines
5.1 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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#pragma once
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#include <thrust/detail/config.h>
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#include <thrust/detail/static_assert.h>
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#include <thrust/system/detail/generic/merge.h>
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#include <thrust/merge.h>
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#include <thrust/functional.h>
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#include <thrust/iterator/zip_iterator.h>
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#include <thrust/detail/internal_functional.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 InputIterator1,
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typename InputIterator2,
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typename OutputIterator,
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typename StrictWeakOrdering>
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OutputIterator merge(thrust::execution_policy<DerivedPolicy> &exec,
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InputIterator1 first1,
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InputIterator1 last1,
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InputIterator2 first2,
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InputIterator2 last2,
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OutputIterator result,
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StrictWeakOrdering comp)
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{
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// unimplemented
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THRUST_STATIC_ASSERT( (thrust::detail::depend_on_instantiation<InputIterator1, false>::value) );
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return result;
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} // end merge()
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template<typename DerivedPolicy,
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typename InputIterator1,
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typename InputIterator2,
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typename OutputIterator>
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OutputIterator merge(thrust::execution_policy<DerivedPolicy> &exec,
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InputIterator1 first1,
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InputIterator1 last1,
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InputIterator2 first2,
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InputIterator2 last2,
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OutputIterator result)
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{
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typedef typename thrust::iterator_value<InputIterator1>::type value_type;
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return thrust::merge(exec,first1,last1,first2,last2,result,thrust::less<value_type>());
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} // end merge()
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template<typename DerivedPolicy, typename InputIterator1, typename InputIterator2, typename InputIterator3, typename InputIterator4, typename OutputIterator1, typename OutputIterator2, typename Compare>
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thrust::pair<OutputIterator1,OutputIterator2>
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merge_by_key(thrust::execution_policy<DerivedPolicy> &exec,
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InputIterator1 keys_first1, InputIterator1 keys_last1,
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InputIterator2 keys_first2, InputIterator2 keys_last2,
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InputIterator3 values_first1, InputIterator4 values_first2,
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OutputIterator1 keys_result,
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OutputIterator2 values_result,
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Compare comp)
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{
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typedef thrust::tuple<InputIterator1, InputIterator3> iterator_tuple1;
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typedef thrust::tuple<InputIterator2, InputIterator4> iterator_tuple2;
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typedef thrust::tuple<OutputIterator1, OutputIterator2> iterator_tuple3;
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typedef thrust::zip_iterator<iterator_tuple1> zip_iterator1;
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typedef thrust::zip_iterator<iterator_tuple2> zip_iterator2;
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typedef thrust::zip_iterator<iterator_tuple3> zip_iterator3;
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zip_iterator1 zipped_first1 = thrust::make_zip_iterator(thrust::make_tuple(keys_first1, values_first1));
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zip_iterator1 zipped_last1 = thrust::make_zip_iterator(thrust::make_tuple(keys_last1, values_first1));
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zip_iterator2 zipped_first2 = thrust::make_zip_iterator(thrust::make_tuple(keys_first2, values_first2));
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zip_iterator2 zipped_last2 = thrust::make_zip_iterator(thrust::make_tuple(keys_last2, values_first2));
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zip_iterator3 zipped_result = thrust::make_zip_iterator(thrust::make_tuple(keys_result, values_result));
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thrust::detail::compare_first<Compare> comp_first(comp);
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iterator_tuple3 result = thrust::merge(exec, zipped_first1, zipped_last1, zipped_first2, zipped_last2, zipped_result, comp_first).get_iterator_tuple();
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return thrust::make_pair(thrust::get<0>(result), thrust::get<1>(result));
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} // end merge_by_key()
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template<typename DerivedPolicy, typename InputIterator1, typename InputIterator2, typename InputIterator3, typename InputIterator4, typename OutputIterator1, typename OutputIterator2>
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thrust::pair<OutputIterator1,OutputIterator2>
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merge_by_key(thrust::execution_policy<DerivedPolicy> &exec,
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InputIterator1 keys_first1, InputIterator1 keys_last1,
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InputIterator2 keys_first2, InputIterator2 keys_last2,
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InputIterator3 values_first1, InputIterator4 values_first2,
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OutputIterator1 keys_result,
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OutputIterator2 values_result)
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{
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typedef typename thrust::iterator_value<InputIterator1>::type value_type;
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return thrust::merge_by_key(exec, keys_first1, keys_last1, keys_first2, keys_last2, values_first1, values_first2, keys_result, values_result, thrust::less<value_type>());
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} // end merge_by_key()
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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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