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76 lines
2.5 KiB
76 lines
2.5 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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#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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