clone.h

Go to the documentation of this file.

/*
 *  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 "../tile_interface/cast.h"
#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