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/*
* Copyright 2008-2013 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/detail/execution_policy.h>
#include <thrust/detail/type_traits.h>
#include <thrust/system/detail/generic/select_system_exists.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace generic
{
namespace select_system_detail
{
// min_system case 1: both systems have the same type, just return the first one
template<typename System>
__host__ __device__
System &min_system(thrust::execution_policy<System> &system1,
thrust::execution_policy<System> &)
{
return thrust::detail::derived_cast(system1);
} // end min_system()
// min_system case 2: systems have differing type and the first type is considered the minimum
template<typename System1, typename System2>
__host__ __device__
typename thrust::detail::enable_if<
thrust::detail::is_same<
System1,
typename thrust::detail::minimum_system<System1,System2>::type
>::value,
System1 &
>::type
min_system(thrust::execution_policy<System1> &system1, thrust::execution_policy<System2> &)
{
return thrust::detail::derived_cast(system1);
} // end min_system()
// min_system case 3: systems have differing type and the second type is considered the minimum
template<typename System1, typename System2>
__host__ __device__
typename thrust::detail::enable_if<
thrust::detail::is_same<
System2,
typename thrust::detail::minimum_system<System1,System2>::type
>::value,
System2 &
>::type
min_system(thrust::execution_policy<System1> &, thrust::execution_policy<System2> &system2)
{
return thrust::detail::derived_cast(system2);
} // end min_system()
} // end select_system_detail
template<typename System>
__host__ __device__
typename thrust::detail::disable_if<
select_system1_exists<System>::value,
System &
>::type
select_system(thrust::execution_policy<System> &system)
{
return thrust::detail::derived_cast(system);
} // end select_system()
template<typename System1, typename System2>
__host__ __device__
typename thrust::detail::enable_if_defined<
thrust::detail::minimum_system<System1,System2>
>::type
&select_system(thrust::execution_policy<System1> &system1,
thrust::execution_policy<System2> &system2)
{
return select_system_detail::min_system(system1,system2);
} // end select_system()
template<typename System1, typename System2, typename System3>
__host__ __device__
typename thrust::detail::lazy_disable_if<
select_system3_exists<System1,System2,System3>::value,
thrust::detail::minimum_system<System1,System2,System3>
>::type
&select_system(thrust::execution_policy<System1> &system1,
thrust::execution_policy<System2> &system2,
thrust::execution_policy<System3> &system3)
{
return select_system(select_system(system1,system2), system3);
} // end select_system()
template<typename System1, typename System2, typename System3, typename System4>
__host__ __device__
typename thrust::detail::lazy_disable_if<
select_system4_exists<System1,System2,System3,System4>::value,
thrust::detail::minimum_system<System1,System2,System3,System4>
>::type
&select_system(thrust::execution_policy<System1> &system1,
thrust::execution_policy<System2> &system2,
thrust::execution_policy<System3> &system3,
thrust::execution_policy<System4> &system4)
{
return select_system(select_system(system1,system2,system3), system4);
} // end select_system()
template<typename System1, typename System2, typename System3, typename System4, typename System5>
__host__ __device__
typename thrust::detail::lazy_disable_if<
select_system5_exists<System1,System2,System3,System4,System5>::value,
thrust::detail::minimum_system<System1,System2,System3,System4,System5>
>::type
&select_system(thrust::execution_policy<System1> &system1,
thrust::execution_policy<System2> &system2,
thrust::execution_policy<System3> &system3,
thrust::execution_policy<System4> &system4,
thrust::execution_policy<System5> &system5)
{
return select_system(select_system(system1,system2,system3,system4), system5);
} // end select_system()
template<typename System1, typename System2, typename System3, typename System4, typename System5, typename System6>
__host__ __device__
typename thrust::detail::lazy_disable_if<
select_system6_exists<System1,System2,System3,System4,System5,System6>::value,
thrust::detail::minimum_system<System1,System2,System3,System4,System5,System6>
>::type
&select_system(thrust::execution_policy<System1> &system1,
thrust::execution_policy<System2> &system2,
thrust::execution_policy<System3> &system3,
thrust::execution_policy<System4> &system4,
thrust::execution_policy<System5> &system5,
thrust::execution_policy<System6> &system6)
{
return select_system(select_system(system1,system2,system3,system4,system5), system6);
} // end select_system()
// map a single any_system_tag to device_system_tag
inline __host__ __device__
thrust::device_system_tag select_system(thrust::any_system_tag)
{
return thrust::device_system_tag();
} // end select_system()
} // end generic
} // end detail
} // end system
THRUST_NAMESPACE_END
|
