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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/iterator/iterator_categories.h>
// XXX eliminate this file
THRUST_NAMESPACE_BEGIN
// define these types without inheritance to avoid ambiguous conversion to base classes
struct input_universal_iterator_tag
{
operator input_host_iterator_tag () {return input_host_iterator_tag();}
operator input_device_iterator_tag () {return input_device_iterator_tag();}
};
struct output_universal_iterator_tag
{
operator output_host_iterator_tag () {return output_host_iterator_tag();}
operator output_device_iterator_tag () {return output_device_iterator_tag();}
};
struct forward_universal_iterator_tag
: input_universal_iterator_tag
{
operator forward_host_iterator_tag () {return forward_host_iterator_tag();};
operator forward_device_iterator_tag () {return forward_device_iterator_tag();};
};
struct bidirectional_universal_iterator_tag
: forward_universal_iterator_tag
{
operator bidirectional_host_iterator_tag () {return bidirectional_host_iterator_tag();};
operator bidirectional_device_iterator_tag () {return bidirectional_device_iterator_tag();};
};
namespace detail
{
// create this struct to control conversion precedence in random_access_universal_iterator_tag
template<typename T>
struct one_degree_of_separation
: T
{
};
} // end detail
struct random_access_universal_iterator_tag
{
// these conversions are all P0
operator random_access_host_iterator_tag () {return random_access_host_iterator_tag();};
operator random_access_device_iterator_tag () {return random_access_device_iterator_tag();};
// bidirectional_universal_iterator_tag is P1
operator detail::one_degree_of_separation<bidirectional_universal_iterator_tag> () {return detail::one_degree_of_separation<bidirectional_universal_iterator_tag>();}
};
THRUST_NAMESPACE_END
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