libutils/MDView.cuh

   1 /*
   2         Copyright (C) 2012  fmaj7b5.info
   3
   4         This program is free software: you can redistribute it and/or modify
   5         it under the terms of the GNU General Public License as published by
   6         the Free Software Foundation, either version 2 of the License, or
   7         (at your option) any later version.
   8
   9         This program is distributed in the hope that it will be useful,
  10         but WITHOUT ANY WARRANTY; without even the implied warranty of
  11         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12         GNU General Public License for more details.
  13
  14         You should have received a copy of the GNU General Public License
  15         along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 #ifndef FM7b5_MDVIEW_CUH
  19 #define FM7b5_MDVIEW_CUH
  20
  21 #include <type_traits>
  22
  23 namespace FM7b5
  24 {
  25         namespace detail
  26         {
  27                 //! copy const qualifier of From to To
  28                 template <typename From, typename To> struct copy_const { typedef To type; };
  29                 template <typename From, typename To> struct copy_const<const From, To> { typedef typename std::add_const<To>::type type; };
  30
  31                 //! array subscript access for multi dimentional data
  32                 template <typename T, size_t D>
  33                 class MDView
  34                 {
  35                 public:
  36                         typedef T value_type;
  37                         typedef typename copy_const<T, uint8_t>::type* byte_pointer_type;
  38                         typedef typename copy_const<T, void>::type* void_pointer_type;
  39
  40                 protected:
  41                         //! temporal class for resolving the operator[]
  42                         template <typename T, size_t D>
  43                         class ref
  44                         {
  45                                 byte_pointer_type const m_p;
  46                                 const size_t* const m_extent;
  47
  48                         public:
  49                                 typedef ref<T, D-1> result_type;
  50
  51                                 __device__
  52                                 ref(void_pointer_type p, const size_t* extent)
  53                                         : m_p(static_cast<byte_pointer_type>(p)), m_extent(extent)
  54                                 {}
  55
  56                                 __device__
  57                                 result_type operator[](size_t i) const
  58                                 {
  59                                         return result_type(m_p + *m_extent * i, m_extent + 1);
  60                                 }
  61                         };
  62
  63                         template <typename T>
  64                         class ref<T, 1>
  65                         {
  66                                 byte_pointer_type const m_p;
  67                                 const size_t* const m_extent;
  68
  69                         public:
  70                                 typedef typename std::add_reference<T>::type result_type;
  71
  72                                 __device__
  73                                 ref(void_pointer_type p, const size_t* extent)
  74                                         : m_p(static_cast<byte_pointer_type>(p)), m_extent(extent)
  75                                 {}
  76
  77                                 __device__
  78                                 result_type operator[](size_t i) const
  79                                 {
  80                                         return *reinterpret_cast<T*>(m_p + *m_extent * i);
  81                                 }
  82                         };
  83
  84                         byte_pointer_type m_data;
  85                         size_t m_extent[D];
  86
  87                 public:
  88                         MDView() {}
  89
  90                         MDView(void_pointer_type p, const size_t extent[D])
  91                                 : m_data(static_cast<byte_pointer_type>(p))
  92                         {
  93                                 for (size_t i = 0; i < D; ++i) {
  94                                         m_extent[i] = extent[i];
  95                                 }
  96                         }
  97
  98                         __device__
  99                         typename ref<T, D>::result_type operator[](size_t i) const
 100                         {
 101                                 ref<T, D> r(m_data, m_extent);
 102                                 return r[i];
 103                         }
 104                 };
 105         }
 106
 107         using detail::MDView;
 108 }
 109
 110 #endif /* FM7b5_MDVIEW_CUH */