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70 lines
2.0 KiB
70 lines
2.0 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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#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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