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87 lines
2.8 KiB
87 lines
2.8 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 trivial_sequence.h |
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* \brief Container-like class for wrapping sequences. The wrapped |
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* sequence always has trivial iterators, even when the input |
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* sequence does not. |
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*/ |
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#pragma once |
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#include <thrust/iterator/iterator_traits.h> |
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#include <thrust/detail/type_traits.h> |
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#include <thrust/detail/execution_policy.h> |
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#include <thrust/detail/temporary_array.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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// never instantiated |
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template<typename Iterator, typename DerivedPolicy, typename is_trivial> struct _trivial_sequence { }; |
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// trivial case |
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template<typename Iterator, typename DerivedPolicy> |
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struct _trivial_sequence<Iterator, DerivedPolicy, thrust::detail::true_type> |
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{ |
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typedef Iterator iterator_type; |
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Iterator first, last; |
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_trivial_sequence(thrust::execution_policy<DerivedPolicy> &, Iterator _first, Iterator _last) : first(_first), last(_last) |
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{ |
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// std::cout << "trivial case" << std::endl; |
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} |
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iterator_type begin() { return first; } |
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iterator_type end() { return last; } |
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}; |
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// non-trivial case |
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template<typename Iterator, typename DerivedPolicy> |
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struct _trivial_sequence<Iterator, DerivedPolicy, thrust::detail::false_type> |
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{ |
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typedef typename thrust::iterator_value<Iterator>::type iterator_value; |
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typedef typename thrust::detail::temporary_array<iterator_value, DerivedPolicy>::iterator iterator_type; |
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thrust::detail::temporary_array<iterator_value, DerivedPolicy> buffer; |
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_trivial_sequence(thrust::execution_policy<DerivedPolicy> &exec, Iterator first, Iterator last) |
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: buffer(exec, first, last) |
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{ |
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// std::cout << "non-trivial case" << std::endl; |
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} |
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iterator_type begin() { return buffer.begin(); } |
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iterator_type end() { return buffer.end(); } |
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}; |
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template <typename Iterator, typename DerivedPolicy> |
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struct trivial_sequence |
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: detail::_trivial_sequence<Iterator, DerivedPolicy, typename thrust::detail::is_trivial_iterator<Iterator>::type> |
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{ |
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typedef _trivial_sequence<Iterator, DerivedPolicy, typename thrust::detail::is_trivial_iterator<Iterator>::type> super_t; |
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trivial_sequence(thrust::execution_policy<DerivedPolicy> &exec, Iterator first, Iterator last) : super_t(exec, first, last) { } |
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}; |
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} // end namespace detail |
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} // end namespace thrust |
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