derek.holloway
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75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
/*
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* Copyright 2008-2013 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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THRUST_NAMESPACE_BEGIN
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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="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input
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* 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
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* or \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 https://en.cppreference.com/w/cpp/iterator/distance
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*/
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template <typename InputIterator>
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inline THRUST_HOST_DEVICE 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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THRUST_NAMESPACE_END
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#include <thrust/detail/distance.inl>
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