RTOpPack_ROpNorm2.hpp

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// @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_NORM2_HPP
#define RTOPPACK_ROP_NORM2_HPP

#include "RTOpPack_RTOpTHelpers.hpp"


namespace RTOpPack {


template<class Scalar>
class ROpNorm2EleWiseReduction
{
public:
  void operator()( const Scalar &v0, Scalar &reduct ) const
    {
      reduct += ScalarTraits<Scalar>::conjugate(v0)*v0;
    }
};


template<class Scalar>
class ROpNorm2
  : public ROp_1_ScalarReduction<Scalar, Scalar, ROpNorm2EleWiseReduction<Scalar> >
{
public:
  typedef Teuchos::ScalarTraits<Scalar> ST;
  ROpNorm2()
    {
      this->setOpNameBase("ROpNorm2");
    }
  typename ST::magnitudeType operator()(const ReductTarget& reduct_obj) const
    {
      const Scalar sqrt_reduct = ST::squareroot(this->getRawVal(reduct_obj));
      return ST::magnitude(sqrt_reduct);
    }
};


} // namespace RTOpPack


#endif // RTOPPACK_ROP_NORM2_HPP