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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>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace sequential
{
// this awkward sequence of definitions arises
// from the desire both for tag to derive
// from execution_policy and for execution_policy
// to convert to tag (when execution_policy is not
// an ancestor of tag)
// forward declaration of tag
struct tag;
// forward declaration of execution_policy
template<typename> struct execution_policy;
// specialize execution_policy for tag
template<>
struct execution_policy<tag>
: thrust::execution_policy<tag>
{};
// tag's definition comes before the generic definition of execution_policy
struct tag : execution_policy<tag>
{
__host__ __device__ constexpr tag() {}
};
// allow conversion to tag when it is not a successor
template<typename Derived>
struct execution_policy
: thrust::execution_policy<Derived>
{
// allow conversion to tag
inline operator tag () const
{
return tag();
}
};
THRUST_INLINE_CONSTANT tag seq;
} // end sequential
} // end detail
} // end system
THRUST_NAMESPACE_END
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