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79 lines
2.0 KiB
79 lines
2.0 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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namespace thrust
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{
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namespace detail
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{
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// execution_policy_base serves as a guard against
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// inifinite recursion in thrust entry points:
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//
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// template<typename DerivedPolicy>
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// void foo(const thrust::detail::execution_policy_base<DerivedPolicy> &s)
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// {
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// using thrust::system::detail::generic::foo;
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//
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// foo(thrust::detail::derived_cast(thrust::detail::strip_const(s));
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// }
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//
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// foo is not recursive when
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// 1. DerivedPolicy is derived from thrust::execution_policy below
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// 2. generic::foo takes thrust::execution_policy as a parameter
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template<typename DerivedPolicy> struct execution_policy_base {};
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template<typename DerivedPolicy>
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__host__ __device__
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inline execution_policy_base<DerivedPolicy> &strip_const(const execution_policy_base<DerivedPolicy> &x)
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{
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return const_cast<execution_policy_base<DerivedPolicy>&>(x);
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}
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template<typename DerivedPolicy>
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__host__ __device__
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inline DerivedPolicy &derived_cast(execution_policy_base<DerivedPolicy> &x)
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{
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return static_cast<DerivedPolicy&>(x);
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}
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template<typename DerivedPolicy>
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__host__ __device__
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inline const DerivedPolicy &derived_cast(const execution_policy_base<DerivedPolicy> &x)
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{
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return static_cast<const DerivedPolicy&>(x);
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}
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} // end detail
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template<typename DerivedPolicy>
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struct execution_policy
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: thrust::detail::execution_policy_base<DerivedPolicy>
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{};
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} // end thrust
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