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159 lines
4.6 KiB
159 lines
4.6 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 temporary_array.h
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* \brief Container-like class temporary storage inside algorithms.
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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/retag.h>
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#include <thrust/detail/contiguous_storage.h>
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#include <thrust/detail/allocator/temporary_allocator.h>
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#include <thrust/detail/allocator/no_throw_allocator.h>
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#include <memory>
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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 T, typename System>
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class temporary_array
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: public contiguous_storage<
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T,
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no_throw_allocator<
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temporary_allocator<T,System>
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>
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>
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{
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private:
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typedef contiguous_storage<
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T,
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no_throw_allocator<
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temporary_allocator<T,System>
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>
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> super_t;
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// to help out the constructor
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typedef no_throw_allocator<temporary_allocator<T,System> > alloc_type;
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public:
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typedef typename super_t::size_type size_type;
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temporary_array(thrust::execution_policy<System> &system, size_type n);
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// provide a kill-switch to explicitly avoid initialization
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temporary_array(int uninit, thrust::execution_policy<System> &system, size_type n);
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template<typename InputIterator>
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temporary_array(thrust::execution_policy<System> &system,
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InputIterator first,
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size_type n);
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template<typename InputIterator, typename InputSystem>
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temporary_array(thrust::execution_policy<System> &system,
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thrust::execution_policy<InputSystem> &input_system,
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InputIterator first,
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size_type n);
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template<typename InputIterator>
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temporary_array(thrust::execution_policy<System> &system,
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InputIterator first,
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InputIterator last);
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template<typename InputSystem, typename InputIterator>
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temporary_array(thrust::execution_policy<System> &system,
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thrust::execution_policy<InputSystem> &input_system,
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InputIterator first,
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InputIterator last);
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~temporary_array();
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}; // end temporary_array
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// XXX eliminate this when we do ranges for real
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template<typename Iterator, typename System>
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class tagged_iterator_range
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{
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public:
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typedef thrust::detail::tagged_iterator<Iterator,System> iterator;
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template<typename Ignored1, typename Ignored2>
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tagged_iterator_range(const Ignored1 &, const Ignored2 &, Iterator first, Iterator last)
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: m_begin(reinterpret_tag<System>(first)),
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m_end(reinterpret_tag<System>(last))
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{}
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iterator begin(void) const { return m_begin; }
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iterator end(void) const { return m_end; }
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private:
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iterator m_begin, m_end;
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};
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// if FromSystem is convertible to ToSystem, then just make a shallow
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// copy of the range. else, use a temporary_array
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// note that the resulting iterator is explicitly tagged with ToSystem either way
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template<typename Iterator, typename FromSystem, typename ToSystem>
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struct move_to_system_base
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: public eval_if<
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is_convertible<
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FromSystem,
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ToSystem
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>::value,
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identity_<
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tagged_iterator_range<Iterator,ToSystem>
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>,
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identity_<
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temporary_array<
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typename thrust::iterator_value<Iterator>::type,
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ToSystem
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>
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>
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>
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{};
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template<typename Iterator, typename FromSystem, typename ToSystem>
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class move_to_system
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: public move_to_system_base<
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Iterator,
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FromSystem,
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ToSystem
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>::type
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{
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typedef typename move_to_system_base<Iterator,FromSystem,ToSystem>::type super_t;
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public:
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move_to_system(thrust::execution_policy<FromSystem> &from_system,
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thrust::execution_policy<ToSystem> &to_system,
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Iterator first,
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Iterator last)
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: super_t(to_system, from_system, first, last) {}
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};
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} // end detail
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} // end thrust
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#include <thrust/detail/temporary_array.inl>
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