Sacado_mpl_range_c.hpp

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//
//                           Sacado Package
//                 Copyright (2006) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
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// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
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// Questions? Contact David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
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#ifndef SACADO_MPL_RANGE_C_HPP
#define SACADO_MPL_RANGE_C_HPP

#include "Sacado_mpl_none.hpp"
#include "Sacado_mpl_size.hpp"
#include "Sacado_mpl_begin.hpp"
#include "Sacado_mpl_end.hpp"
#include "Sacado_mpl_next.hpp"
#include "Sacado_mpl_at.hpp"
#include "Sacado_mpl_deref.hpp"
#include "Sacado_mpl_integral_c.hpp"

namespace Sacado {

  namespace mpl {

    // range_c tag for mpl operations
    struct range_c_tag {};

    // range_c
    template <class T, T N, T M, T Delta = 1>
    struct range_c {
      typedef range_c_tag tag;
      typedef range_c type;
      static const int sz = (M-N+Delta-1)/Delta;
      typedef T integral_type;
      static const int start_value = N;
      static const int end_value = M;
      static const int step_value = Delta;
    };

    // iterator
    template <class Range, int Pos>
    struct range_c_iterator {
      static const int value = Pos;
    };

    // size
    template <>
    struct size_impl<range_c_tag> {
      template <class Range>
      struct apply {
        static const int value = Range::sz;
      };
    };

    // begin
    template <>
    struct begin_impl<range_c_tag> {
      template <class Range>
      struct apply {
        typedef range_c_iterator<Range,0> type;
      };
    };

    // end
    template <>
    struct end_impl<range_c_tag> {
      template <class Range>
      struct apply {
        typedef range_c_iterator<Range,Range::sz> type;
      };
    };

    // next
    template <class Range, int Pos>
    struct next< range_c_iterator<Range,Pos> > {
      typedef range_c_iterator<Range,Pos+1> type;
    };



    // at
    template <int Pos>
    struct at_impl<range_c_tag, Pos> {
      template <class Range>
      struct apply {
        typedef integral_c<typename Range::integral_type,
                           Range::start_value + Range::step_value*Pos> type;
      };
    };

    // deref
    template <class Range, int Pos>
    struct deref< range_c_iterator<Range,Pos> > : mpl::at<Range,Pos> {};

  }
}

#endif