RTOpPack_ROpNorm2.hpp

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// 
//      Thyra: Interfaces and Support Code for the Interoperability of Abstract Numerical Algorithms 
//                 Copyright (2004) Sandia Corporation
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// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
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#ifndef RTOPPACK_ROP_NORM2_HPP
#define RTOPPACK_ROP_NORM2_HPP

#include "RTOpPack_RTOpTHelpers.hpp"

namespace RTOpPack {

template<class Scalar>
class ROpNorm2 : public ROpScalarReductionBase<Scalar> {
  typedef Teuchos::ScalarTraits<Scalar> ST;
public:
  ROpNorm2() : RTOpT<Scalar>("ROpNorm2") {}
  typename Teuchos::ScalarTraits<Scalar>::magnitudeType
  operator()(const ReductTarget& reduct_obj ) const
    { return ST::magnitude(ST::squareroot(this->getRawVal(reduct_obj))); }
  void apply_op(
    const int   num_vecs,       const SubVectorT<Scalar>         sub_vecs[]
    ,const int  num_targ_vecs,  const MutableSubVectorT<Scalar>  targ_sub_vecs[]
    ,ReductTarget *_reduct_obj
    ) const
    {
      using Teuchos::dyn_cast;
      ReductTargetScalar<Scalar> &reduct_obj = dyn_cast<ReductTargetScalar<Scalar> >(*_reduct_obj); 
      RTOP_APPLY_OP_1_0(num_vecs,sub_vecs,num_targ_vecs,targ_sub_vecs);
      Scalar dot = reduct_obj.get();
      if( v0_s == 1 ) {
        for( RTOp_index_type i = 0; i < subDim; ++i, ++v0_val )
          dot += ST::conjugate(*v0_val) * (*v0_val);
      }
      else {
        for( RTOp_index_type i = 0; i < subDim; ++i, v0_val += v0_s )
          dot += ST::conjugate(*v0_val) * (*v0_val);
      }
      reduct_obj.set(dot);
    }
}; // class ROpNorm2

} // namespace RTOpPack

#endif // RTOPPACK_ROP_NORM2_HPP

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