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104 lines
2.7 KiB
104 lines
2.7 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/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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