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70 lines
1.9 KiB
70 lines
1.9 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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#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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