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142 lines
5.5 KiB
142 lines
5.5 KiB
/* |
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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/system/detail/generic/unique_by_key.h> |
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#include <thrust/iterator/iterator_traits.h> |
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#include <thrust/iterator/detail/minimum_system.h> |
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#include <thrust/iterator/zip_iterator.h> |
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#include <thrust/transform.h> |
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#include <thrust/detail/temporary_array.h> |
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#include <thrust/detail/internal_functional.h> |
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#include <thrust/detail/copy_if.h> |
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#include <thrust/unique.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 ExecutionPolicy, |
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typename ForwardIterator1, |
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typename ForwardIterator2> |
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thrust::pair<ForwardIterator1,ForwardIterator2> |
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unique_by_key(thrust::execution_policy<ExecutionPolicy> &exec, |
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ForwardIterator1 keys_first, |
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ForwardIterator1 keys_last, |
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ForwardIterator2 values_first) |
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{ |
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typedef typename thrust::iterator_traits<ForwardIterator1>::value_type KeyType; |
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return thrust::unique_by_key(exec, keys_first, keys_last, values_first, thrust::equal_to<KeyType>()); |
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} // end unique_by_key() |
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template<typename ExecutionPolicy, |
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typename ForwardIterator1, |
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typename ForwardIterator2, |
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typename BinaryPredicate> |
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thrust::pair<ForwardIterator1,ForwardIterator2> |
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unique_by_key(thrust::execution_policy<ExecutionPolicy> &exec, |
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ForwardIterator1 keys_first, |
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ForwardIterator1 keys_last, |
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ForwardIterator2 values_first, |
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BinaryPredicate binary_pred) |
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{ |
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typedef typename thrust::iterator_traits<ForwardIterator1>::value_type InputType1; |
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typedef typename thrust::iterator_traits<ForwardIterator2>::value_type InputType2; |
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ForwardIterator2 values_last = values_first + (keys_last - keys_first); |
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thrust::detail::temporary_array<InputType1,ExecutionPolicy> keys(exec, keys_first, keys_last); |
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thrust::detail::temporary_array<InputType2,ExecutionPolicy> vals(exec, values_first, values_last); |
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return thrust::unique_by_key_copy(exec, keys.begin(), keys.end(), vals.begin(), keys_first, values_first, binary_pred); |
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} // end unique_by_key() |
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template<typename ExecutionPolicy, |
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typename InputIterator1, |
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typename InputIterator2, |
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typename OutputIterator1, |
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typename OutputIterator2> |
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thrust::pair<OutputIterator1,OutputIterator2> |
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unique_by_key_copy(thrust::execution_policy<ExecutionPolicy> &exec, |
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InputIterator1 keys_first, |
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InputIterator1 keys_last, |
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InputIterator2 values_first, |
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OutputIterator1 keys_output, |
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OutputIterator2 values_output) |
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{ |
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typedef typename thrust::iterator_traits<InputIterator1>::value_type KeyType; |
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return thrust::unique_by_key_copy(exec, keys_first, keys_last, values_first, keys_output, values_output, thrust::equal_to<KeyType>()); |
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} // end unique_by_key_copy() |
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template<typename ExecutionPolicy, |
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typename InputIterator1, |
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typename InputIterator2, |
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typename OutputIterator1, |
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typename OutputIterator2, |
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typename BinaryPredicate> |
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thrust::pair<OutputIterator1,OutputIterator2> |
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unique_by_key_copy(thrust::execution_policy<ExecutionPolicy> &exec, |
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InputIterator1 keys_first, |
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InputIterator1 keys_last, |
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InputIterator2 values_first, |
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OutputIterator1 keys_output, |
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OutputIterator2 values_output, |
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BinaryPredicate binary_pred) |
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{ |
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typedef typename thrust::iterator_traits<InputIterator1>::difference_type difference_type; |
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// empty sequence |
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if(keys_first == keys_last) |
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return thrust::make_pair(keys_output, values_output); |
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difference_type n = thrust::distance(keys_first, keys_last); |
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thrust::detail::temporary_array<int,ExecutionPolicy> stencil(exec,n); |
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// mark first element in each group |
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stencil[0] = 1; |
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thrust::transform(exec, keys_first, keys_last - 1, keys_first + 1, stencil.begin() + 1, thrust::detail::not2(binary_pred)); |
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thrust::zip_iterator< thrust::tuple<OutputIterator1, OutputIterator2> > result = |
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thrust::copy_if(exec, |
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thrust::make_zip_iterator(thrust::make_tuple(keys_first, values_first)), |
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thrust::make_zip_iterator(thrust::make_tuple(keys_first, values_first)) + n, |
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stencil.begin(), |
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thrust::make_zip_iterator(thrust::make_tuple(keys_output, values_output)), |
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thrust::identity<int>()); |
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difference_type output_size = result - thrust::make_zip_iterator(thrust::make_tuple(keys_output, values_output)); |
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return thrust::make_pair(keys_output + output_size, values_output + output_size); |
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} // end unique_by_key_copy() |
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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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