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88 lines
2.8 KiB
88 lines
2.8 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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/*! \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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