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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>
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
THRUST_NAMESPACE_BEGIN
namespace detail
{
struct execution_policy_marker {};
// execution_policy_base serves as a guard against
// inifinite recursion in thrust entry points:
//
// template<typename DerivedPolicy>
// void foo(const thrust::detail::execution_policy_base<DerivedPolicy> &s)
// {
// using thrust::system::detail::generic::foo;
//
// foo(thrust::detail::derived_cast(thrust::detail::strip_const(s));
// }
//
// foo is not recursive when
// 1. DerivedPolicy is derived from thrust::execution_policy below
// 2. generic::foo takes thrust::execution_policy as a parameter
template<typename DerivedPolicy>
struct execution_policy_base : execution_policy_marker {};
template<typename DerivedPolicy>
constexpr __host__ __device__
execution_policy_base<DerivedPolicy> &strip_const(const execution_policy_base<DerivedPolicy> &x)
{
return const_cast<execution_policy_base<DerivedPolicy>&>(x);
}
template<typename DerivedPolicy>
constexpr __host__ __device__
DerivedPolicy &derived_cast(execution_policy_base<DerivedPolicy> &x)
{
return static_cast<DerivedPolicy&>(x);
}
template<typename DerivedPolicy>
constexpr __host__ __device__
const DerivedPolicy &derived_cast(const execution_policy_base<DerivedPolicy> &x)
{
return static_cast<const DerivedPolicy&>(x);
}
} // end detail
template<typename DerivedPolicy>
struct execution_policy
: thrust::detail::execution_policy_base<DerivedPolicy>
{};
THRUST_NAMESPACE_END
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