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 /******************************************************************************
  * Copyright (c) 2010-2011, Duane Merrill.  All rights reserved.
  * Copyright (c) 2011-2018, NVIDIA CORPORATION.  All rights reserved.
  * Modifications Copyright (c) 2017-2020, Advanced Micro Devices, Inc.  All rights reserved.
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 #ifndef HIPCUB_ROCPRIM_ITERATOR_CACHE_MODIFIED_INPUT_ITERATOR_HPP_
 #define HIPCUB_ROCPRIM_ITERATOR_CACHE_MODIFIED_INPUT_ITERATOR_HPP_
  
 #include <iterator>
 #include <iostream>
  
 #include "../thread/thread_load.hpp"
 #include "../util_type.hpp"
  
 #if (THRUST_VERSION >= 100700)
     // This iterator is compatible with Thrust API 1.7 and newer
     #include <thrust/iterator/iterator_facade.h>
     #include <thrust/iterator/iterator_traits.h>
 #endif // THRUST_VERSION
  
 BEGIN_HIPCUB_NAMESPACE
  
 template <
     CacheLoadModifier   MODIFIER,
     typename            ValueType,
     typename            OffsetT = ptrdiff_t>
 class CacheModifiedInputIterator
 {
 public:
  
     // Required iterator traits
     typedef CacheModifiedInputIterator          self_type;              
     typedef OffsetT                             difference_type;        
     typedef ValueType                           value_type;             
     typedef ValueType*                          pointer;                
     typedef ValueType                           reference;              
     typedef std::random_access_iterator_tag     iterator_category;      
  
 public:
  
     ValueType* ptr;
  
     __host__ __device__ __forceinline__ CacheModifiedInputIterator(
         ValueType* ptr)     
     :
         ptr(const_cast<typename std::remove_cv<ValueType>::type *>(ptr))
     {}
  
     __host__ __device__ __forceinline__ self_type operator++(int)
     {
         self_type retval = *this;
         ptr++;
         return retval;
     }
  
     __host__ __device__ __forceinline__ self_type operator++()
     {
         ptr++;
         return *this;
     }
  
     __device__ __forceinline__ reference operator*() const
     {
         return ThreadLoad<MODIFIER>(ptr);
     }
  
     template <typename Distance>
     __host__ __device__ __forceinline__ self_type operator+(Distance n) const
     {
         self_type retval(ptr + n);
         return retval;
     }
  
     template <typename Distance>
     __host__ __device__ __forceinline__ self_type& operator+=(Distance n)
     {
         ptr += n;
         return *this;
     }
  
     template <typename Distance>
     __host__ __device__ __forceinline__ self_type operator-(Distance n) const
     {
         self_type retval(ptr - n);
         return retval;
     }
  
     template <typename Distance>
     __host__ __device__ __forceinline__ self_type& operator-=(Distance n)
     {
         ptr -= n;
         return *this;
     }
  
     __host__ __device__ __forceinline__ difference_type operator-(self_type other) const
     {
         return ptr - other.ptr;
     }
  
     template <typename Distance>
     __device__ __forceinline__ reference operator[](Distance n) const
     {
         return ThreadLoad<MODIFIER>(ptr + n);
     }
  
     __device__ __forceinline__ pointer operator->()
     {
         return &ThreadLoad<MODIFIER>(ptr);
     }
  
     __host__ __device__ __forceinline__ bool operator==(const self_type& rhs)
     {
         return (ptr == rhs.ptr);
     }
  
     __host__ __device__ __forceinline__ bool operator!=(const self_type& rhs)
     {
         return (ptr != rhs.ptr);
     }
  
 #ifndef DOXYGEN_SHOULD_SKIP_THIS    // Do not document
  
     friend std::ostream& operator<<(std::ostream& os, const self_type& /*itr*/)
     {
         return os;
     }
  
 #endif
  
 };
  
 END_HIPCUB_NAMESPACE
  
 #endif // HIPCUB_ROCPRIM_ITERATOR_CACHE_MODIFIED_INPUT_ITERATOR_HPP_