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183 lines
6.1 KiB
183 lines
6.1 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/detail/config.h>
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#include <thrust/detail/execution_policy.h>
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#include <thrust/detail/type_traits.h>
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#include <thrust/detail/type_traits/is_metafunction_defined.h>
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#include <thrust/iterator/detail/minimum_system.h>
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#include <thrust/system/detail/generic/type_traits.h>
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#include <thrust/iterator/iterator_traits.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 detail
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{
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namespace generic
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{
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namespace select_system_detail
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{
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// min_system case 1: both systems have the same type, just return the first one
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template<typename System>
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__host__ __device__
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System &min_system(thrust::execution_policy<System> &system1,
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thrust::execution_policy<System> &)
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{
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return thrust::detail::derived_cast(system1);
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} // end min_system()
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// min_system case 2: systems have differing type and the first type is considered the minimum
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template<typename System1, typename System2>
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__host__ __device__
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typename thrust::detail::enable_if<
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thrust::detail::is_same<
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System1,
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typename thrust::detail::minimum_system<System1,System2>::type
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>::value,
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System1 &
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>::type
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min_system(thrust::execution_policy<System1> &system1, thrust::execution_policy<System2> &)
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{
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return thrust::detail::derived_cast(system1);
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} // end min_system()
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// min_system case 3: systems have differing type and the second type is considered the minimum
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template<typename System1, typename System2>
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__host__ __device__
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typename thrust::detail::enable_if<
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thrust::detail::is_same<
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System2,
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typename thrust::detail::minimum_system<System1,System2>::type
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>::value,
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System2 &
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>::type
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min_system(thrust::execution_policy<System1> &, thrust::execution_policy<System2> &system2)
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{
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return thrust::detail::derived_cast(system2);
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} // end min_system()
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} // end select_system_detail
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template<typename System>
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__host__ __device__
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typename thrust::detail::disable_if<
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select_system1_exists<System>::value,
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System &
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>::type
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select_system(thrust::execution_policy<System> &system)
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{
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return thrust::detail::derived_cast(system);
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} // end select_system()
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template<typename System1, typename System2>
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__host__ __device__
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typename thrust::detail::enable_if_defined<
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thrust::detail::minimum_system<System1,System2>
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>::type
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&select_system(thrust::execution_policy<System1> &system1,
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thrust::execution_policy<System2> &system2)
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{
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return select_system_detail::min_system(system1,system2);
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} // end select_system()
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template<typename System1, typename System2, typename System3>
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__host__ __device__
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typename thrust::detail::lazy_disable_if<
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select_system3_exists<System1,System2,System3>::value,
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thrust::detail::minimum_system<System1,System2,System3>
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>::type
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&select_system(thrust::execution_policy<System1> &system1,
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thrust::execution_policy<System2> &system2,
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thrust::execution_policy<System3> &system3)
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{
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return select_system(select_system(system1,system2), system3);
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} // end select_system()
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template<typename System1, typename System2, typename System3, typename System4>
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__host__ __device__
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typename thrust::detail::lazy_disable_if<
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select_system4_exists<System1,System2,System3,System4>::value,
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thrust::detail::minimum_system<System1,System2,System3,System4>
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>::type
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&select_system(thrust::execution_policy<System1> &system1,
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thrust::execution_policy<System2> &system2,
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thrust::execution_policy<System3> &system3,
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thrust::execution_policy<System4> &system4)
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{
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return select_system(select_system(system1,system2,system3), system4);
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} // end select_system()
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template<typename System1, typename System2, typename System3, typename System4, typename System5>
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__host__ __device__
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typename thrust::detail::lazy_disable_if<
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select_system5_exists<System1,System2,System3,System4,System5>::value,
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thrust::detail::minimum_system<System1,System2,System3,System4,System5>
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>::type
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&select_system(thrust::execution_policy<System1> &system1,
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thrust::execution_policy<System2> &system2,
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thrust::execution_policy<System3> &system3,
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thrust::execution_policy<System4> &system4,
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thrust::execution_policy<System5> &system5)
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{
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return select_system(select_system(system1,system2,system3,system4), system5);
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} // end select_system()
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template<typename System1, typename System2, typename System3, typename System4, typename System5, typename System6>
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__host__ __device__
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typename thrust::detail::lazy_disable_if<
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select_system6_exists<System1,System2,System3,System4,System5,System6>::value,
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thrust::detail::minimum_system<System1,System2,System3,System4,System5,System6>
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>::type
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&select_system(thrust::execution_policy<System1> &system1,
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thrust::execution_policy<System2> &system2,
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thrust::execution_policy<System3> &system3,
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thrust::execution_policy<System4> &system4,
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thrust::execution_policy<System5> &system5,
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thrust::execution_policy<System6> &system6)
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{
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return select_system(select_system(system1,system2,system3,system4,system5), system6);
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} // end select_system()
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// map a single any_system_tag to device_system_tag
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inline __host__ __device__
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thrust::device_system_tag select_system(thrust::any_system_tag)
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{
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return thrust::device_system_tag();
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} // end select_system()
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} // end generic
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} // end detail
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} // end system
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} // end thrust
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