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/*
* Copyright 2008-2021 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>
#include <thrust/iterator/transform_iterator.h>
#include <thrust/iterator/iterator_adaptor.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/detail/type_traits.h>
#include <thrust/detail/type_traits/result_of_adaptable_function.h>
THRUST_NAMESPACE_BEGIN
template <class UnaryFunction, class Iterator, class Reference, class Value>
class transform_iterator;
namespace detail
{
// Compute the iterator_adaptor instantiation to be used for transform_iterator
template <class UnaryFunc, class Iterator, class Reference, class Value>
struct transform_iterator_base
{
private:
// By default, dereferencing the iterator yields the same as the function.
typedef typename thrust::detail::ia_dflt_help<
Reference,
thrust::detail::result_of_adaptable_function<UnaryFunc(typename thrust::iterator_value<Iterator>::type)>
>::type reference;
// To get the default for Value: remove any reference on the
// result type, but retain any constness to signal
// non-writability. Note that if we adopt Thomas' suggestion
// to key non-writability *only* on the Reference argument,
// we'd need to strip constness here as well.
typedef typename thrust::detail::ia_dflt_help<
Value,
thrust::detail::remove_reference<reference>
>::type cv_value_type;
public:
typedef thrust::iterator_adaptor
<
transform_iterator<UnaryFunc, Iterator, Reference, Value>
, Iterator
, cv_value_type
, thrust::use_default // Leave the system alone
//, thrust::use_default // Leave the traversal alone
// use the Iterator's category to let any system iterators remain random access even though
// transform_iterator's reference type may not be a reference
// XXX figure out why only iterators whose reference types are true references are random access
, typename thrust::iterator_traits<Iterator>::iterator_category
, reference
> type;
};
} // end detail
THRUST_NAMESPACE_END
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