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71 lines
2.0 KiB
71 lines
2.0 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/iterator/counting_iterator.h>
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#include <thrust/iterator/iterator_adaptor.h>
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namespace thrust
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{
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// forward declaration of constant_iterator
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template<typename,typename,typename> class constant_iterator;
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namespace detail
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{
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template<typename Value,
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typename Incrementable,
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typename System>
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struct constant_iterator_base
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{
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typedef Value value_type;
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// the reference type is the same as the value_type.
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// we wish to avoid returning a reference to the internal state
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// of the constant_iterator, which is prone to subtle bugs.
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// consider the temporary iterator created in the expression
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// *(iter + i)
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typedef value_type reference;
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// the incrementable type is int unless otherwise specified
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typedef typename thrust::detail::ia_dflt_help<
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Incrementable,
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thrust::detail::identity_<int>
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>::type incrementable;
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typedef typename thrust::counting_iterator<
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incrementable,
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System,
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thrust::random_access_traversal_tag
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> base_iterator;
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typedef typename thrust::iterator_adaptor<
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constant_iterator<Value, Incrementable, System>,
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base_iterator,
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value_type, // XXX we may need to pass const value_type here as boost counting_iterator does
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typename thrust::iterator_system<base_iterator>::type,
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typename thrust::iterator_traversal<base_iterator>::type,
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reference
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> type;
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}; // end constant_iterator_base
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} // end detail
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} // end thrust
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