clone.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
 *
 *  clone.h
 *  Jan 10, 2016
 *
 */

#ifndef TILEDARRAY_TILE_INTERFACE_CLONE_H__INCLUDED
#define TILEDARRAY_TILE_INTERFACE_CLONE_H__INCLUDED

#include "../type_traits.h"

namespace TiledArray {



  template <typename Arg>
  inline auto clone(const Arg& arg) {
    return arg.clone();
  }

  namespace tile_interface {

    using TiledArray::clone;

    template <typename T>
    using result_of_clone_t = typename std::decay<decltype(clone(std::declval<T>()))>::type;


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


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


    // Internal tile clone operation

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

      typedef Result result_type; 
      typedef Arg argument_type; 

      result_type operator()(const argument_type& arg) const {
        using TiledArray::clone;
        return clone(arg);
      }
    };

    // Internal tile clone and cast operation

    template <typename Result, typename Arg>
    class Clone<Result, Arg,
        typename std::enable_if<
            ! std::is_same<Result, typename clone_trait<Arg>::type >::value
        >::type> :
        public TiledArray::Cast<Result, Arg>
    { };

  } // namespace tile_interface



  template <typename Arg>
  struct clone_trait :
      public TiledArray::tile_interface::clone_trait<Arg>
  { };



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


} // namespace TiledArray

#endif // TILEDARRAY_TILE_INTERFACE_CLONE_H__INCLUDED