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75 lines
2.5 KiB
75 lines
2.5 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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#include <thrust/detail/config.h> |
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#include <thrust/system/detail/generic/count.h> |
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#include <thrust/transform_reduce.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 InputType, typename Predicate, typename CountType> |
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struct count_if_transform |
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{ |
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__host__ __device__ |
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count_if_transform(Predicate _pred) : pred(_pred){} |
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__host__ __device__ |
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CountType operator()(const InputType& val) |
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{ |
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if(pred(val)) |
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return 1; |
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else |
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return 0; |
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} // end operator() |
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Predicate pred; |
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}; // end count_if_transform |
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template <typename DerivedPolicy, typename InputIterator, typename EqualityComparable> |
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typename thrust::iterator_traits<InputIterator>::difference_type |
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count(thrust::execution_policy<DerivedPolicy> &exec, InputIterator first, InputIterator last, const EqualityComparable& value) |
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{ |
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typedef typename thrust::iterator_traits<InputIterator>::value_type InputType; |
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// XXX use placeholder expression here |
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return thrust::count_if(exec, first, last, thrust::detail::equal_to_value<EqualityComparable>(value)); |
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} // end count() |
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template <typename DerivedPolicy, typename InputIterator, typename Predicate> |
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typename thrust::iterator_traits<InputIterator>::difference_type |
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count_if(thrust::execution_policy<DerivedPolicy> &exec, InputIterator first, InputIterator last, Predicate pred) |
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{ |
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typedef typename thrust::iterator_traits<InputIterator>::value_type InputType; |
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typedef typename thrust::iterator_traits<InputIterator>::difference_type CountType; |
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thrust::system::detail::generic::count_if_transform<InputType, Predicate, CountType> unary_op(pred); |
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thrust::plus<CountType> binary_op; |
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return thrust::transform_reduce(exec, first, last, unary_op, CountType(0), binary_op); |
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} // end count_if() |
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} // end generic |
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} // end detail |
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} // end system |
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} // end thrust |
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