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120 lines
3.7 KiB
120 lines
3.7 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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#pragma once
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#include <thrust/reverse.h>
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#include <thrust/detail/type_traits.h>
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#include <thrust/iterator/iterator_traits.h>
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#include <thrust/system/detail/internal/scalar/stable_merge_sort.h>
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#include <thrust/system/detail/internal/scalar/stable_radix_sort.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 cpp
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{
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namespace detail
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{
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namespace dispatch
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{
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////////////////
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// Radix Sort //
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////////////////
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template<typename RandomAccessIterator,
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typename StrictWeakOrdering>
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void stable_sort(RandomAccessIterator first,
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RandomAccessIterator last,
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StrictWeakOrdering comp,
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thrust::detail::true_type)
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{
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thrust::system::detail::internal::scalar::stable_radix_sort(first, last);
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// if comp is greater<T> then reverse the keys
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typedef typename thrust::iterator_traits<RandomAccessIterator>::value_type KeyType;
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const static bool reverse = thrust::detail::is_same<StrictWeakOrdering, typename thrust::greater<KeyType> >::value;
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if (reverse)
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thrust::reverse(first, last);
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}
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template<typename RandomAccessIterator1,
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typename RandomAccessIterator2,
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typename StrictWeakOrdering>
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void stable_sort_by_key(RandomAccessIterator1 first1,
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RandomAccessIterator1 last1,
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RandomAccessIterator2 first2,
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StrictWeakOrdering comp,
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thrust::detail::true_type)
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{
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// if comp is greater<T> then reverse the keys and values
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typedef typename thrust::iterator_traits<RandomAccessIterator1>::value_type KeyType;
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const static bool reverse = thrust::detail::is_same<StrictWeakOrdering, typename thrust::greater<KeyType> >::value;
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// note, we also have to reverse the (unordered) input to preserve stability
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if (reverse)
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{
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thrust::reverse(first1, last1);
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thrust::reverse(first2, first2 + (last1 - first1));
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}
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thrust::system::detail::internal::scalar::stable_radix_sort_by_key(first1, last1, first2);
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if (reverse)
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{
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thrust::reverse(first1, last1);
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thrust::reverse(first2, first2 + (last1 - first1));
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}
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}
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////////////////
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// Merge Sort //
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////////////////
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template<typename RandomAccessIterator,
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typename StrictWeakOrdering>
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void stable_sort(RandomAccessIterator first,
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RandomAccessIterator last,
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StrictWeakOrdering comp,
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thrust::detail::false_type)
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{
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thrust::system::detail::internal::scalar::stable_merge_sort(first, last, comp);
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}
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template<typename RandomAccessIterator1,
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typename RandomAccessIterator2,
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typename StrictWeakOrdering>
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void stable_sort_by_key(RandomAccessIterator1 first1,
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RandomAccessIterator1 last1,
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RandomAccessIterator2 first2,
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StrictWeakOrdering comp,
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thrust::detail::false_type)
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{
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thrust::system::detail::internal::scalar::stable_merge_sort_by_key(first1, last1, first2, comp);
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}
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} // end namespace dispatch
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} // end namespace detail
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} // end namespace cpp
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} // end namespace system
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} // end namespace thrust
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