You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
112 lines
2.6 KiB
112 lines
2.6 KiB
11 years ago
|
/*
|
||
|
* Copyright 2008-2012 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/type_traits.h>
|
||
|
#include <thrust/iterator/iterator_traits.h>
|
||
|
#include <thrust/detail/use_default.h>
|
||
|
#include <thrust/iterator/iterator_facade.h>
|
||
|
|
||
|
namespace thrust
|
||
|
{
|
||
|
|
||
|
|
||
|
// forward declaration of iterator_adaptor for iterator_adaptor_base below
|
||
|
template<typename Derived,
|
||
|
typename Base,
|
||
|
typename Value,
|
||
|
typename System,
|
||
|
typename Traversal,
|
||
|
typename Reference,
|
||
|
typename Difference
|
||
|
>
|
||
|
class iterator_adaptor;
|
||
|
|
||
|
|
||
|
namespace detail
|
||
|
{
|
||
|
|
||
|
// If T is use_default, return the result of invoking
|
||
|
// DefaultNullaryFn, otherwise return T.
|
||
|
// XXX rename to dflt_help
|
||
|
template <class T, class DefaultNullaryFn>
|
||
|
struct ia_dflt_help
|
||
|
: thrust::detail::eval_if<
|
||
|
thrust::detail::is_same<T, thrust::use_default>::value
|
||
|
, DefaultNullaryFn
|
||
|
, thrust::detail::identity_<T>
|
||
|
>
|
||
|
{
|
||
|
}; // end ia_dflt_help
|
||
|
|
||
|
|
||
|
// A metafunction which computes an iterator_adaptor's base class,
|
||
|
// a specialization of iterator_facade.
|
||
|
template<typename Derived,
|
||
|
typename Base,
|
||
|
typename Value,
|
||
|
typename System,
|
||
|
typename Traversal,
|
||
|
typename Reference,
|
||
|
typename Difference
|
||
|
>
|
||
|
struct iterator_adaptor_base
|
||
|
{
|
||
|
typedef typename ia_dflt_help<
|
||
|
Value,
|
||
|
iterator_value<Base>
|
||
|
>::type value;
|
||
|
|
||
|
typedef typename ia_dflt_help<
|
||
|
System,
|
||
|
thrust::iterator_system<Base>
|
||
|
>::type system;
|
||
|
|
||
|
typedef typename ia_dflt_help<
|
||
|
Traversal,
|
||
|
thrust::iterator_traversal<Base>
|
||
|
>::type traversal;
|
||
|
|
||
|
typedef typename ia_dflt_help<
|
||
|
Reference,
|
||
|
thrust::detail::eval_if<
|
||
|
thrust::detail::is_same<Value,use_default>::value,
|
||
|
thrust::iterator_reference<Base>,
|
||
|
thrust::detail::add_reference<Value>
|
||
|
>
|
||
|
>::type reference;
|
||
|
|
||
|
typedef typename ia_dflt_help<
|
||
|
Difference,
|
||
|
iterator_difference<Base>
|
||
|
>::type difference;
|
||
|
|
||
|
typedef thrust::iterator_facade<
|
||
|
Derived,
|
||
|
value,
|
||
|
system,
|
||
|
traversal,
|
||
|
reference,
|
||
|
difference
|
||
|
> type;
|
||
|
}; // end iterator_adaptor_base
|
||
|
|
||
|
|
||
|
} // end detail
|
||
|
} // end thrust
|
||
|
|