RTOpPack_ROpWeightedNorm2.hpp

// @HEADER
// ***********************************************************************
// 
// 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.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact Roscoe A. Bartlett (rabartl@sandia.gov) 
// 
// ***********************************************************************
// @HEADER
 
#ifndef RTOPPACK_ROP_WEIGHTED_NORM2_HPP
#define RTOPPACK_ROP_WEIGHTED_NORM2_HPP
 
#include "RTOpPack_RTOpTHelpers.hpp"
 
 
namespace RTOpPack {
 
 
template<class Scalar>
class ROpWeightedNorm2EleWiseReduction
{
public:
  void operator()( const Scalar &v0, const Scalar &v1, Scalar &reduct ) const
    {
      reduct += v0 * ScalarTraits<Scalar>::conjugate(v1)*v1;
    }
};
 
 
template<class Scalar>
class ROpWeightedNorm2
  : public ROp_2_ScalarReduction<Scalar, Scalar,
      ROpWeightedNorm2EleWiseReduction<Scalar> >
{
public:
  typedef Teuchos::ScalarTraits<Scalar> ST;
  ROpWeightedNorm2()
    {
      this->setOpNameBase("ROpWeightedNorm2");
    }
  typename ST::magnitudeType operator()(const ReductTarget& reduct_obj ) const
    { return ST::magnitude(ST::squareroot(this->getRawVal(reduct_obj))); }
};
 
 
} // namespace RTOpPack
 
 
#endif // RTOPPACK_ROP_WEIGHTED_NORM2_HPP