RTOpPack_ROpNorm2.hpp

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// 
// RTOp: Interfaces and Support Software for Vector Reduction Transformation
//       Operations
//                Copyright (2006) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
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// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
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#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