boost/multi_array/range_list.hpp

// Copyright 2002 The Trustees of Indiana University.
// Use, modification and distribution is subject to the Boost Software 
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//  Boost.MultiArray Library
//  Authors: Ronald Garcia
//           Jeremy Siek
//           Andrew Lumsdaine
//  See http://www.boost.org/libs/multi_array for documentation.
#ifndef RANGE_LIST_RG072501_HPP
#define RANGE_LIST_RG072501_HPP
//
// range_list.hpp - helper to build boost::arrays for *_set types
//
#include "boost/array.hpp"
namespace boost {
namespace detail {
namespace multi_array {
/////////////////////////////////////////////////////////////////////////
// choose range list begins
//
struct choose_range_list_n {
  template <typename T, std::size_t NumRanges>
  struct bind {
    typedef boost::array<T,NumRanges> type;
  };
};
struct choose_range_list_zero {
  template <typename T, std::size_t NumRanges>
  struct bind {
    typedef boost::array<T,1> type;
  };
};
template <std::size_t NumRanges>
struct range_list_gen_helper {
  typedef choose_range_list_n choice;
};
template <>
struct range_list_gen_helper<0> {
  typedef choose_range_list_zero choice;
};
template <typename T, std::size_t NumRanges>
struct range_list_generator {
private:
  typedef typename range_list_gen_helper<NumRanges>::choice Choice;
public:
  typedef typename Choice::template bind<T,NumRanges>::type type;
};
//
// choose range list ends
/////////////////////////////////////////////////////////////////////////
} // namespace multi_array
} // namespace detail
} // namespace boost
#endif // RANGE_LIST_RG072501_HPP