boost/multi_array/range_list.hpp

   1 // Copyright 2002 The Trustees of Indiana University.
   2
   3 // Use, modification and distribution is subject to the Boost Software
   4 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6
   7 //  Boost.MultiArray Library
   8 //  Authors: Ronald Garcia
   9 //           Jeremy Siek
  10 //           Andrew Lumsdaine
  11 //  See http://www.boost.org/libs/multi_array for documentation.
  12
  13 #ifndef RANGE_LIST_RG072501_HPP
  14 #define RANGE_LIST_RG072501_HPP
  15 //
  16 // range_list.hpp - helper to build boost::arrays for *_set types
  17 //
  18
  19 #include "boost/array.hpp"
  20
  21 namespace boost {
  22 namespace detail {
  23 namespace multi_array {
  24
  25 /////////////////////////////////////////////////////////////////////////
  26 // choose range list begins
  27 //
  28
  29 struct choose_range_list_n {
  30   template <typename T, std::size_t NumRanges>
  31   struct bind {
  32     typedef boost::array<T,NumRanges> type;
  33   };
  34 };
  35
  36 struct choose_range_list_zero {
  37   template <typename T, std::size_t NumRanges>
  38   struct bind {
  39     typedef boost::array<T,1> type;
  40   };
  41 };
  42
  43
  44 template <std::size_t NumRanges>
  45 struct range_list_gen_helper {
  46   typedef choose_range_list_n choice;
  47 };
  48
  49 template <>
  50 struct range_list_gen_helper<0> {
  51   typedef choose_range_list_zero choice;
  52 };
  53
  54 template <typename T, std::size_t NumRanges>
  55 struct range_list_generator {
  56 private:
  57   typedef typename range_list_gen_helper<NumRanges>::choice Choice;
  58 public:
  59   typedef typename Choice::template bind<T,NumRanges>::type type;
  60 };
  61
  62 //
  63 // choose range list ends
  64 /////////////////////////////////////////////////////////////////////////
  65
  66 } // namespace multi_array
  67 } // namespace detail
  68 } // namespace boost
  69
  70 #endif // RANGE_LIST_RG072501_HPP