File size: 2,728 Bytes
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* Copyright 2008-2013 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <thrust/detail/config.h>
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
#include <thrust/system/detail/generic/count.h>
#include <thrust/transform_reduce.h>
#include <thrust/detail/internal_functional.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace generic
{
template <typename InputType, typename Predicate, typename CountType>
struct count_if_transform
{
__host__ __device__
count_if_transform(Predicate _pred) : pred(_pred){}
__thrust_exec_check_disable__
__host__ __device__
CountType operator()(const InputType& val)
{
if(pred(val))
return 1;
else
return 0;
} // end operator()
Predicate pred;
}; // end count_if_transform
template <typename DerivedPolicy, typename InputIterator, typename EqualityComparable>
__host__ __device__
typename thrust::iterator_traits<InputIterator>::difference_type
count(thrust::execution_policy<DerivedPolicy> &exec, InputIterator first, InputIterator last, const EqualityComparable& value)
{
using thrust::placeholders::_1;
return thrust::count_if(exec, first, last, _1 == value);
} // end count()
template <typename DerivedPolicy, typename InputIterator, typename Predicate>
__host__ __device__
typename thrust::iterator_traits<InputIterator>::difference_type
count_if(thrust::execution_policy<DerivedPolicy> &exec, InputIterator first, InputIterator last, Predicate pred)
{
typedef typename thrust::iterator_traits<InputIterator>::value_type InputType;
typedef typename thrust::iterator_traits<InputIterator>::difference_type CountType;
thrust::system::detail::generic::count_if_transform<InputType, Predicate, CountType> unary_op(pred);
thrust::plus<CountType> binary_op;
return thrust::transform_reduce(exec, first, last, unary_op, CountType(0), binary_op);
} // end count_if()
} // end generic
} // end detail
} // end system
THRUST_NAMESPACE_END
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