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78 lines
2.0 KiB
78 lines
2.0 KiB
/* |
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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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