shift.h

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/*
 *  This file is a part of TiledArray.
 *  Copyright (C) 2016  Virginia Tech
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  Justus Calvin
 *  Department of Chemistry, Virginia Tech
 *
 *  shift.h
 *  Jan 10, 2016
 *
 */

#ifndef TILEDARRAY_TILE_INTERFACE_SHIFT_H__INCLUDED
#define TILEDARRAY_TILE_INTERFACE_SHIFT_H__INCLUDED

#include "../type_traits.h"
#include "cast.h"

namespace TiledArray {


  template <typename Arg, typename Index>
  inline auto shift(const Arg& arg, const Index& range_shift)
  { return arg.shift(range_shift); }



  template <typename Arg, typename Index>
  inline auto shift_to(Arg& arg, const Index& range_shift)
  { return arg.shift_to(range_shift); }


  namespace tile_interface {

    using TiledArray::shift;
    using TiledArray::shift_to;

    template <typename T>
    using result_of_shift_t = typename std::decay<
        decltype(shift(std::declval<T>(),
        std::declval<std::vector<long> >()))>::type;

    template <typename T>
    using result_of_shift_to_t = typename std::decay<
        decltype(shift_to(std::declval<T>(),
        std::declval<std::vector<long> >()))>::type;

    template <typename Result, typename Arg, typename Enabler = void>
    class Shift {
    public:

      typedef Result result_type; 
      typedef Arg argument_type; 

      template <typename Index>
      result_type operator()(const argument_type& arg,
          const Index& range_shift) const
      { return shift(arg, range_shift); }
    };

    template <typename Result, typename Arg>
    class Shift<Result, Arg,
        typename std::enable_if<
            ! std::is_same<Result, result_of_shift_t<Arg> >::value
        >::type> :
        public TiledArray::Cast<Result, result_of_shift_t<Arg> >
    {
    private:
      typedef TiledArray::Cast<Result, result_of_shift_t<Arg> > Cast_;
    public:

      typedef Result result_type; 
      typedef Arg argument_type; 

      template <typename Index>
      result_type operator()(const argument_type& arg,
          const Index& range_shift) const
      { return Cast_::operator()(shift(arg, range_shift)); }

    };

    template <typename Result, typename Arg, typename Enabler = void>
    class ShiftTo {
    public:

      typedef Result result_type; 
      typedef Arg argument_type; 

      template <typename Index>
      result_type operator()(argument_type& arg,
          const Index& range_shift) const
      { return shift_to(arg, range_shift); }
    };


    template <typename Result, typename Arg>
    class ShiftTo<Result, Arg,
        typename std::enable_if<
            ! std::is_same<Result, result_of_shift_to_t<Arg> >::value
        >::type> :
        public TiledArray::Cast<Result, result_of_shift_to_t<Arg> >
    {
    private:
      typedef TiledArray::Cast<Result, result_of_shift_to_t<Arg> > Cast_;
    public:

      typedef Result result_type; 
      typedef Arg argument_type; 

      template <typename Index>
      result_type operator()(argument_type& arg,
          const Index& range_shift) const
      { return Cast_::operator()(shift_to(arg, range_shift)); }

    };


    template <typename Arg, typename Enabler = void>
    struct shift_trait {
      typedef Arg type;
    };


    template <typename Arg>
    struct shift_trait<Arg,
        typename std::enable_if<
            TiledArray::detail::is_type<result_of_shift_t<Arg> >::value
        >::type>
    {
      typedef result_of_shift_t<Arg> type;
    };

  } // namespace tile_interface



  template <typename Result, typename Arg>
  class Shift : public TiledArray::tile_interface::Shift<Result, Arg> { };



  template <typename Result, typename Arg>
  class ShiftTo : public TiledArray::tile_interface::ShiftTo<Result, Arg> { };


} // namespace TiledArray

#endif // TILEDARRAY_TILE_INTERFACE_SHIFT_H__INCLUDED