RTOpPack_ROpMaxIndexLessThanBound.hpp

// @HEADER
// *****************************************************************************
// RTOp: Interfaces and Support Software for Vector Reduction Transformation
//       Operations
//
// Copyright 2006 NTESS and the RTOp contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef RTOPPACK_ROP_MAX_INDEX_LESS_THAN_BOUND_HPP
#define RTOPPACK_ROP_MAX_INDEX_LESS_THAN_BOUND_HPP

#include "RTOpPack_ROpMaxIndex.hpp"
#include "Teuchos_StandardMemberCompositionMacros.hpp"


namespace RTOpPack {


template<class Scalar>
class ROpMaxIndexLessThanBoundEleWiseReductionOp {
public:
  ROpMaxIndexLessThanBoundEleWiseReductionOp(
    const Scalar &bound = ScalarTraits<Scalar>::zero()
    )
    :bound_(bound)
    {}
  void operator()(const index_type i, const Scalar &v0,
    ScalarIndex<Scalar> &reduct) const
    {
      if(
        v0 <  bound_
        &&
        (
          v0 > reduct.scalar
          ||
          ( v0 == reduct.scalar && i < reduct.index )
          )
        )
      {
        reduct = ScalarIndex<Scalar>(v0, i);
      }
    }
private:
  Scalar bound_;
};


template<class Scalar>
class ROpMaxIndexLessThanBound
  : public ROp_1_CoordVariantScalarReduction<
      Scalar,
      ScalarIndex<Scalar>,
      ROpMaxIndexLessThanBoundEleWiseReductionOp<Scalar>,
      ROpMaxIndexReductObjReductionOp<Scalar> >
{
public:
  ROpMaxIndexLessThanBound(
    const Scalar &bound_in = Teuchos::ScalarTraits<Scalar>::zero()
    )
    {
      this->setOpNameBase("ROpMaxIndexLessThanBound");
      bound(bound_in);
      this->initReductObjValue(
        ScalarIndex<Scalar>(-ScalarTraits<Scalar>::rmax(), -1));
    }
  void bound(const Scalar& bound_in)
    { 
      this->setEleWiseReduction(
        ROpMaxIndexLessThanBoundEleWiseReductionOp<Scalar>(bound_in)
        );
    }
  ScalarIndex<Scalar> operator()(const ReductTarget& reduct_obj ) const
    { return this->getRawVal(reduct_obj); }
};


} // namespace RTOpPack


#endif // RTOPPACK_ROP_MAX_INDEX_LESS_THAN_BOUND_HPP