/*
 *  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/config.h>
#include <thrust/detail/type_traits/pointer_traits.h>

#if __GNUC__
// forward declaration of gnu's __normal_iterator
namespace __gnu_cxx
{

template<typename Iterator, typename Container> class __normal_iterator;

} // end __gnu_cxx
#endif // __GNUC__

#if _MSC_VER
// forward declaration of MSVC's "normal iterators"
namespace std
{

template<typename Value, typename Difference, typename Pointer, typename Reference> struct _Ranit;

} // end std
#endif // _MSC_VER

namespace thrust
{
namespace detail
{

#ifdef __GNUC__
template<typename T>
  struct is_gnu_normal_iterator
    : false_type
{};


// catch gnu __normal_iterators
template<typename Iterator, typename Container>
  struct is_gnu_normal_iterator< __gnu_cxx::__normal_iterator<Iterator, Container> >
    : true_type
{};
#endif // __GNUC__


#ifdef _MSC_VER
// catch msvc _Ranit
template<typename Iterator>
  struct is_convertible_to_msvc_Ranit :
    is_convertible<
      Iterator,
      std::_Ranit<
        typename iterator_value<Iterator>::type,
        typename iterator_difference<Iterator>::type,
        typename iterator_pointer<Iterator>::type,
        typename iterator_reference<Iterator>::type
      >
    >
{};
#endif // _MSC_VER


template<typename T>
  struct is_trivial_iterator :
    integral_constant<
      bool,
        is_pointer<T>::value
      | thrust::detail::is_thrust_pointer<T>::value
#if __GNUC__
      | is_gnu_normal_iterator<T>::value
#endif // __GNUC__
#ifdef _MSC_VER
      | is_convertible_to_msvc_Ranit<T>::value
#endif // _MSC_VER
    >
{};

} // end detail
} // end thrust