reduce.h

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#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");
  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");
  return ex.reduce(first, std::distance(first,last), 
      std::forward<Result>(identity), std::forward<Combiner>(combine_op));
}

}

#endif