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131 lines
4.2 KiB
131 lines
4.2 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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#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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#include <thrust/iterator/detail/minimum_system.h> |
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#include <thrust/detail/copy.h> |
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#include <thrust/detail/temporary_array.h> |
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#include <thrust/system/cpp/detail/execution_policy.h> |
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namespace thrust |
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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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typename OutputIterator> |
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OutputIterator sequential_copy(InputIterator first, |
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InputIterator last, |
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OutputIterator result) |
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{ |
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for(; first != last; ++first, ++result) |
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{ |
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*result = *first; |
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} // end for |
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return result; |
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} // end sequential_copy() |
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template<typename BidirectionalIterator1, |
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typename BidirectionalIterator2> |
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BidirectionalIterator2 sequential_copy_backward(BidirectionalIterator1 first, |
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BidirectionalIterator1 last, |
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BidirectionalIterator2 result) |
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{ |
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// yes, we preincrement |
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// the ranges are open on the right, i.e. [first, last) |
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while(first != last) |
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{ |
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*--result = *--last; |
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} // end while |
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return result; |
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} // end sequential_copy_backward() |
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namespace dispatch |
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{ |
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template<typename DerivedPolicy, |
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typename RandomAccessIterator1, |
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typename RandomAccessIterator2> |
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RandomAccessIterator2 overlapped_copy(thrust::system::cpp::detail::execution_policy<DerivedPolicy> &, |
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RandomAccessIterator1 first, |
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RandomAccessIterator1 last, |
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RandomAccessIterator2 result) |
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{ |
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if(first < last && first <= result && result < last) |
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{ |
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// result lies in [first, last) |
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// it's safe to use std::copy_backward here |
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thrust::detail::sequential_copy_backward(first, last, result + (last - first)); |
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result += (last - first); |
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} // end if |
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else |
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{ |
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// result + (last - first) lies in [first, last) |
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// it's safe to use sequential_copy here |
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result = thrust::detail::sequential_copy(first, last, result); |
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} // end else |
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return result; |
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} // end overlapped_copy() |
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template<typename DerivedPolicy, |
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typename RandomAccessIterator1, |
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typename RandomAccessIterator2> |
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RandomAccessIterator2 overlapped_copy(thrust::execution_policy<DerivedPolicy> &exec, |
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RandomAccessIterator1 first, |
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RandomAccessIterator1 last, |
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RandomAccessIterator2 result) |
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{ |
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typedef typename thrust::iterator_value<RandomAccessIterator1>::type value_type; |
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// make a temporary copy of [first,last), and copy into it first |
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thrust::detail::temporary_array<value_type, DerivedPolicy> temp(exec, first, last); |
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return thrust::copy(exec, temp.begin(), temp.end(), result); |
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} // end overlapped_copy() |
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} // end dispatch |
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template<typename RandomAccessIterator1, |
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typename RandomAccessIterator2> |
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RandomAccessIterator2 overlapped_copy(RandomAccessIterator1 first, |
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RandomAccessIterator1 last, |
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RandomAccessIterator2 result) |
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{ |
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typedef typename thrust::iterator_system<RandomAccessIterator2>::type System1; |
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typedef typename thrust::iterator_system<RandomAccessIterator2>::type System2; |
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typedef typename thrust::detail::minimum_system<System1, System2>::type System; |
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// XXX presumes System is default constructible |
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System system; |
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return thrust::detail::dispatch::overlapped_copy(system, first, last, result); |
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} // end overlapped_copy() |
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} // end detail |
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} // end thrust |
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