reduce.h

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/*
 * Copyright 2018 Universidad Carlos III de Madrid
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef GRPPI_REDUCE_H 
#define GRPPI_REDUCE_H
 
#include <utility>
 
#include "common/iterator_traits.h"
#include "common/execution_traits.h"
 
namespace grppi {
 
template <typename Execution, typename InputIt, typename Result, typename Combiner,
    requires_iterator<InputIt> = 0>
auto reduce(const Execution & ex,
            InputIt first, std::size_t size,
            Result && identity,
            Combiner && combine_op)
{
  static_assert(supports_reduce<Execution>(),
                "reduce not supported on execution type");
//  static_assert(std::is_same<Result,typename std::result_of<Combiner(Result,Result)>::type>::value,
//                "reduce combiner should be homogeneous:T = op(T,T)");
  return ex.reduce(first, size,
                   std::forward<Result>(identity), std::forward<Combiner>(combine_op));
}
 
template <typename Execution, typename InputIt, typename Result, typename Combiner,
          requires_iterator<InputIt> = 0>
auto reduce(const Execution & ex, 
            InputIt first, InputIt last, 
            Result && identity,
            Combiner && combine_op)
{
  static_assert(supports_reduce<Execution>(),
      "reduce not supported on execution type");
//  static_assert(std::is_same<Result,typename std::result_of<Combiner(Result,Result)>::type>::value,
//                "reduce combiner should be homogeneous:T = op(T,T)");
  return ex.reduce(first, std::distance(first,last), 
      std::forward<Result>(identity), std::forward<Combiner>(combine_op));
}
 
}
 
#endif