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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/counting_iterator.h>
#include <thrust/iterator/iterator_adaptor.h>
THRUST_NAMESPACE_BEGIN
// forward declaration of constant_iterator
template<typename,typename,typename> class constant_iterator;
namespace detail
{
template<typename Value,
typename Incrementable,
typename System>
struct constant_iterator_base
{
typedef Value value_type;
// the reference type is the same as the value_type.
// we wish to avoid returning a reference to the internal state
// of the constant_iterator, which is prone to subtle bugs.
// consider the temporary iterator created in the expression
// *(iter + i)
typedef value_type reference;
// the incrementable type is int unless otherwise specified
typedef typename thrust::detail::ia_dflt_help<
Incrementable,
thrust::detail::identity_<thrust::detail::intmax_t>
>::type incrementable;
typedef typename thrust::counting_iterator<
incrementable,
System,
thrust::random_access_traversal_tag
> base_iterator;
typedef typename thrust::iterator_adaptor<
constant_iterator<Value, Incrementable, System>,
base_iterator,
value_type, // XXX we may need to pass const value_type here as boost counting_iterator does
typename thrust::iterator_system<base_iterator>::type,
typename thrust::iterator_traversal<base_iterator>::type,
reference
> type;
}; // end constant_iterator_base
} // end detail
THRUST_NAMESPACE_END
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