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69 lines
1.9 KiB
69 lines
1.9 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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#include <thrust/detail/config.h> |
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#include <thrust/system/detail/generic/distance.h> |
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#include <thrust/iterator/iterator_traits.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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namespace detail |
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{ |
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template<typename InputIterator> |
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inline typename thrust::iterator_traits<InputIterator>::difference_type |
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distance(InputIterator first, InputIterator last, thrust::incrementable_traversal_tag) |
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{ |
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typename thrust::iterator_traits<InputIterator>::difference_type result(0); |
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while(first != last) |
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{ |
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++first; |
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++result; |
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} // end while |
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return result; |
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} // end advance() |
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template<typename InputIterator> |
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inline typename thrust::iterator_traits<InputIterator>::difference_type |
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distance(InputIterator first, InputIterator last, thrust::random_access_traversal_tag) |
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{ |
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return last - first; |
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} // end distance() |
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} // end detail |
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template<typename InputIterator> |
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inline typename thrust::iterator_traits<InputIterator>::difference_type |
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distance(InputIterator first, InputIterator last) |
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{ |
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// dispatch on iterator traversal |
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return thrust::system::detail::generic::detail::distance(first, last, |
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typename thrust::iterator_traversal<InputIterator>::type()); |
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} // end advance() |
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} // end namespace generic |
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} // end namespace detail |
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} // end namespace system |
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} // end namespace thrust |
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