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103 lines
2.7 KiB
103 lines
2.7 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/pair.h> |
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#include <thrust/iterator/iterator_traits.h> |
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#include <thrust/detail/type_traits/algorithm/intermediate_type_from_function_and_iterators.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 internal |
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{ |
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namespace scalar |
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{ |
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template <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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typename BinaryFunction> |
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thrust::pair<OutputIterator1,OutputIterator2> |
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reduce_by_key(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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BinaryFunction binary_op) |
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{ |
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typedef typename thrust::iterator_traits<InputIterator1>::value_type InputKeyType; |
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typedef typename thrust::iterator_traits<InputIterator2>::value_type InputValueType; |
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typedef typename thrust::detail::intermediate_type_from_function_and_iterators< |
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InputIterator2, |
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OutputIterator2, |
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BinaryFunction |
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>::type TemporaryType; |
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if(keys_first != keys_last) |
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{ |
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InputKeyType temp_key = *keys_first; |
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TemporaryType temp_value = *values_first; |
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for(++keys_first, ++values_first; |
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keys_first != keys_last; |
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++keys_first, ++values_first) |
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{ |
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InputKeyType key = *keys_first; |
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InputValueType value = *values_first; |
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if (binary_pred(temp_key, key)) |
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{ |
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temp_value = binary_op(temp_value, value); |
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} |
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else |
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{ |
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*keys_output = temp_key; |
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*values_output = temp_value; |
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++keys_output; |
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++values_output; |
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temp_key = key; |
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temp_value = value; |
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} |
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} |
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*keys_output = temp_key; |
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*values_output = temp_value; |
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++keys_output; |
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++values_output; |
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} |
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return thrust::make_pair(keys_output, values_output); |
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} |
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} // end namespace scalar |
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} // end namespace internal |
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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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