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| /* | |
| * Copyright 2008-2013 NVIDIA Corporation | |
| * | |
| * Licensed under the Apache License, Version 2.0 (the "License"); | |
| * you may not use this file except in compliance with the License. | |
| * You may obtain a copy of the License at | |
| * | |
| * http://www.apache.org/licenses/LICENSE-2.0 | |
| * | |
| * Unless required by applicable law or agreed to in writing, software | |
| * distributed under the License is distributed on an "AS IS" BASIS, | |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| * See the License for the specific language governing permissions and | |
| * limitations under the License. | |
| */ | |
| /*! \file distance.h | |
| * \brief Computes the size of a range | |
| */ | |
| namespace thrust | |
| { | |
| /*! \addtogroup iterators | |
| * \{ | |
| */ | |
| /*! \p distance finds the distance between \p first and \p last, i.e. the | |
| * number of times that \p first must be incremented until it is equal to | |
| * \p last. | |
| * | |
| * \param first The beginning of an input range of interest. | |
| * \param last The end of an input range of interest. | |
| * \return The distance between the beginning and end of the input range. | |
| * | |
| * \tparam InputIterator is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>. | |
| * | |
| * \pre If \c InputIterator meets the requirements of random access iterator, \p last shall be reachable from \p first or | |
| * \p first shall be reachable from \p last; otherwise, \p last shall be reachable from \p first. | |
| * | |
| * The following code snippet demonstrates how to use \p distance to compute | |
| * the distance to one iterator from another. | |
| * | |
| * \code | |
| * #include <thrust/distance.h> | |
| * #include <thrust/device_vector.h> | |
| * ... | |
| * thrust::device_vector<int> vec(13); | |
| * thrust::device_vector<int>::iterator iter1 = vec.begin(); | |
| * thrust::device_vector<int>::iterator iter2 = iter1 + 7; | |
| * | |
| * int d = thrust::distance(iter1, iter2); | |
| * | |
| * // d is 7 | |
| * \endcode | |
| * | |
| * \see http://www.sgi.com/tech/stl/distance.html | |
| */ | |
| template<typename InputIterator> | |
| inline __host__ __device__ | |
| typename thrust::iterator_traits<InputIterator>::difference_type | |
| distance(InputIterator first, InputIterator last); | |
| /*! \} // end iterators | |
| */ | |
| } // end thrust | |