RTOpPack_TOpAXPY.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_TOP_AXPY_HPP
#define RTOPPACK_TOP_AXPY_HPP

#include "RTOpPack_RTOpTHelpers.hpp"

namespace RTOpPack {

template<class Scalar>
class TOpAXPY : public ROpScalarTransformationBase<Scalar> {
public:
  void alpha( const Scalar& alpha ) { this->scalarData(alpha); }
  Scalar alpha() const { return this->scalarData(); }
  TOpAXPY( const Scalar &alpha = Teuchos::ScalarTraits<Scalar>::zero() )
    : RTOpT<Scalar>("TOpAXPY"), ROpScalarTransformationBase<Scalar>(alpha)
    {}
  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
    {
      RTOP_APPLY_OP_1_1(num_vecs,sub_vecs,num_targ_vecs,targ_sub_vecs);
      const Scalar alpha = this->alpha();
      if( z0_s==1 && v0_s==1 ) {
        for( RTOp_index_type i = 0; i < subDim; ++i )
          *z0_val++ += alpha * (*v0_val++);
      }
      else {
        for( RTOp_index_type i = 0; i < subDim; ++i, v0_val += v0_s, z0_val += z0_s )
          *z0_val += alpha * (*v0_val);
      }
    }
}; // class TOpAXPY

} // namespace RTOpPack

#endif // RTOPPACK_TOP_AXPY_HPP

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