binary_reduction.h

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/*
 *  This file is a part of TiledArray.
 *  Copyright (C) 2014  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
 *
 *  binary_reduction.h
 *  Apr 2, 2014
 *
 */
 
#ifndef TILEDARRAY_TILE_OP_BINARY_REDUCTION_H__INCLUDED
#define TILEDARRAY_TILE_OP_BINARY_REDUCTION_H__INCLUDED
 
#include <TiledArray/tile_op/tile_interface.h>
 
namespace TiledArray {
 
 
template <typename Left, typename Right>
class DotReduction {
 public:
  // typedefs
  using result_type =
      decltype(dot(std::declval<Left>(), std::declval<Right>()));
  typedef Left first_argument_type;
  typedef Right second_argument_type;
 
  // Reduction functions
 
  // Make an empty result object
  result_type operator()() const { return result_type(0); }
 
  // Post process the result
  const result_type& operator()(const result_type& result) const {
    return result;
  }
 
  // Reduce two result objects
  void operator()(result_type& result, const result_type& arg) const {
    result += arg;
  }
 
  // Reduce an argument pair
  void operator()(result_type& result, const first_argument_type& left,
                  const second_argument_type& right) const {
    using TiledArray::dot;
    result += dot(left, right);
  }
 
};  // class DotReduction
 
 
template <typename Left, typename Right>
class InnerProductReduction {
 public:
  // typedefs
  using result_type =
      decltype(inner_product(std::declval<Left>(), std::declval<Right>()));
  typedef Left first_argument_type;
  typedef Right second_argument_type;
 
  // Reduction functions
 
  // Make an empty result object
  result_type operator()() const { return result_type(0); }
 
  // Post process the result
  const result_type& operator()(const result_type& result) const {
    return result;
  }
 
  // Reduce two result objects
  void operator()(result_type& result, const result_type& arg) const {
    result += arg;
  }
 
  // Reduce an argument pair
  void operator()(result_type& result, const first_argument_type& left,
                  const second_argument_type& right) const {
    using TiledArray::inner_product;
    result += inner_product(left, right);
  }
 
};  // class InnerProductReduction
 
}  // namespace TiledArray
 
#endif  // TILEDARRAY_TILE_OP_BINARY_REDUCTION_H__INCLUDED