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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/type_traits.h>
#include <thrust/iterator/detail/tagged_iterator.h>
#include <thrust/detail/pointer.h>
THRUST_NAMESPACE_BEGIN
namespace detail
{
// we can retag an iterator if FromTag converts to ToTag
// or vice versa
template<typename FromTag, typename ToTag>
struct is_retaggable
: integral_constant<
bool,
(is_convertible<FromTag,ToTag>::value || is_convertible<ToTag,FromTag>::value)
>
{};
template<typename FromTag, typename ToTag, typename Result>
struct enable_if_retaggable
: enable_if<
is_retaggable<FromTag,ToTag>::value,
Result
>
{}; // end enable_if_retaggable
} // end detail
template<typename Tag, typename Iterator>
__host__ __device__
thrust::detail::tagged_iterator<Iterator,Tag>
reinterpret_tag(Iterator iter)
{
return thrust::detail::tagged_iterator<Iterator,Tag>(iter);
} // end reinterpret_tag()
// specialization for raw pointer
template<typename Tag, typename T>
__host__ __device__
thrust::pointer<T,Tag>
reinterpret_tag(T *ptr)
{
return thrust::pointer<T,Tag>(ptr);
} // end reinterpret_tag()
// specialization for thrust::pointer
template<typename Tag, typename T, typename OtherTag, typename Reference, typename Derived>
__host__ __device__
thrust::pointer<T,Tag>
reinterpret_tag(thrust::pointer<T,OtherTag,Reference,Derived> ptr)
{
return reinterpret_tag<Tag>(ptr.get());
} // end reinterpret_tag()
// avoid deeply-nested tagged_iterator
template<typename Tag, typename BaseIterator, typename OtherTag>
__host__ __device__
thrust::detail::tagged_iterator<BaseIterator,Tag>
reinterpret_tag(thrust::detail::tagged_iterator<BaseIterator,OtherTag> iter)
{
return reinterpret_tag<Tag>(iter.base());
} // end reinterpret_tag()
template<typename Tag, typename Iterator>
__host__ __device__
typename thrust::detail::enable_if_retaggable<
typename thrust::iterator_system<Iterator>::type,
Tag,
thrust::detail::tagged_iterator<Iterator,Tag>
>::type
retag(Iterator iter)
{
return reinterpret_tag<Tag>(iter);
} // end retag()
// specialization for raw pointer
template<typename Tag, typename T>
__host__ __device__
typename thrust::detail::enable_if_retaggable<
typename thrust::iterator_system<T*>::type,
Tag,
thrust::pointer<T,Tag>
>::type
retag(T *ptr)
{
return reinterpret_tag<Tag>(ptr);
} // end retag()
// specialization for thrust::pointer
template<typename Tag, typename T, typename OtherTag>
__host__ __device__
typename thrust::detail::enable_if_retaggable<
OtherTag,
Tag,
thrust::pointer<T,Tag>
>::type
retag(thrust::pointer<T,OtherTag> ptr)
{
return reinterpret_tag<Tag>(ptr);
} // end retag()
// avoid deeply-nested tagged_iterator
template<typename Tag, typename BaseIterator, typename OtherTag>
__host__ __device__
typename thrust::detail::enable_if_retaggable<
OtherTag,
Tag,
thrust::detail::tagged_iterator<BaseIterator,Tag>
>::type
retag(thrust::detail::tagged_iterator<BaseIterator,OtherTag> iter)
{
return reinterpret_tag<Tag>(iter);
} // end retag()
THRUST_NAMESPACE_END
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