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76 lines
2.3 KiB
76 lines
2.3 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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/*! \file distance.h |
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* \brief Computes the size of a range |
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*/ |
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#pragma once |
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#include <thrust/detail/config.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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/*! \addtogroup iterators |
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* \{ |
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*/ |
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/*! \p distance finds the distance between \p first and \p last, i.e. the |
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* number of times that \p first must be incremented until it is equal to |
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* \p last. |
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* |
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* \param first The beginning of an input range of interest. |
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* \param last The end of an input range of interest. |
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* \return The distance between the beginning and end of the input range. |
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* |
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* \tparam InputIterator is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>. |
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* |
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* \pre If \c InputIterator meets the requirements of random access iterator, \p last shall be reachable from \p first or |
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* \p first shall be reachable from \p last; otherwise, \p last shall be reachable from \p first. |
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* |
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* The following code snippet demonstrates how to use \p distance to compute |
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* the distance to one iterator from another. |
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* |
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* \code |
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* #include <thrust/distance.h> |
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* #include <thrust/device_vector.h> |
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* ... |
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* thrust::device_vector<int> vec(13); |
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* thrust::device_vector<int>::iterator iter1 = vec.begin(); |
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* thrust::device_vector<int>::iterator iter2 = iter1 + 7; |
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* |
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* int d = thrust::distance(iter1, iter2); |
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* |
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* // d is 7 |
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* \endcode |
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* |
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* \see http://www.sgi.com/tech/stl/distance.html |
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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); |
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/*! \} // end iterators |
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*/ |
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} // end thrust |
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#include <thrust/detail/distance.inl> |
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