RTOpPack_ROpNormInf.hpp

00001 // @HEADER
00002 // ***********************************************************************
00003 // 
00004 // RTOp: Interfaces and Support Software for Vector Reduction Transformation
00005 //       Operations
00006 //                Copyright (2006) Sandia Corporation
00007 // 
00008 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00009 // license for use of this work by or on behalf of the U.S. Government.
00010 // 
00011 // This library is free software; you can redistribute it and/or modify
00012 // it under the terms of the GNU Lesser General Public License as
00013 // published by the Free Software Foundation; either version 2.1 of the
00014 // License, or (at your option) any later version.
00015 //  
00016 // This library is distributed in the hope that it will be useful, but
00017 // WITHOUT ANY WARRANTY; without even the implied warranty of
00018 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00019 // Lesser General Public License for more details.
00020 //  
00021 // You should have received a copy of the GNU Lesser General Public
00022 // License along with this library; if not, write to the Free Software
00023 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00024 // USA
00025 // Questions? Contact Roscoe A. Bartlett (rabartl@sandia.gov) 
00026 // 
00027 // ***********************************************************************
00028 // @HEADER
00029 
00030 #ifndef RTOPPACK_ROP_NORMINF_HPP
00031 #define RTOPPACK_ROP_NORMINF_HPP
00032 
00033 #include "RTOpPack_RTOpTHelpers.hpp"
00034 
00035 namespace RTOpPack {
00036 
00039 template<class Scalar>
00040 class ROpNormInf
00041   : public ROpScalarReductionBase<Scalar,typename Teuchos::ScalarTraits<Scalar>::magnitudeType>
00042 {
00043 public:
00045   typedef   typename Teuchos::ScalarTraits<Scalar>::magnitudeType  ScalarMag;
00047   ROpNormInf() : RTOpT<Scalar>("ROpNormInf") {}
00049   ScalarMag operator()(const ReductTarget& reduct_obj ) const
00050     { return this->getRawVal(reduct_obj); }
00054   void reduce_reduct_objs(
00055     const ReductTarget& _in_reduct_obj, ReductTarget* _inout_reduct_obj
00056     ) const
00057     {
00058       using Teuchos::dyn_cast;
00059       const ReductTargetScalar<ScalarMag>
00060         &in_reduct_obj = dyn_cast<const ReductTargetScalar<ScalarMag> >(_in_reduct_obj);
00061       ReductTargetScalar<ScalarMag>
00062         &inout_reduct_obj = dyn_cast<ReductTargetScalar<ScalarMag> >(*_inout_reduct_obj);
00063       if( in_reduct_obj.get() > inout_reduct_obj.get() ) inout_reduct_obj.set(in_reduct_obj.get());
00064     }
00066   void apply_op(
00067     const int   num_vecs,       const ConstSubVectorView<Scalar>    sub_vecs[]
00068     ,const int  num_targ_vecs,  const SubVectorView<Scalar>         targ_sub_vecs[]
00069     ,ReductTarget *_reduct_obj
00070     ) const
00071     {
00072       using Teuchos::dyn_cast;
00073       ReductTargetScalar<ScalarMag>
00074         &reduct_obj = dyn_cast<ReductTargetScalar<ScalarMag> >(*_reduct_obj); 
00075       RTOP_APPLY_OP_1_0(num_vecs,sub_vecs,num_targ_vecs,targ_sub_vecs);
00076       ScalarMag norm_inf = reduct_obj.get();
00077       if( v0_s == 1 ) {
00078         for( Teuchos_Index i = 0; i < subDim; ++i ) {
00079           const ScalarMag
00080             mag = Teuchos::ScalarTraits<Scalar>::magnitude(*v0_val++);
00081           norm_inf = mag > norm_inf ? mag : norm_inf;
00082         }
00083       }
00084       else {
00085         for( Teuchos_Index i = 0; i < subDim; ++i, v0_val += v0_s ) {
00086           const ScalarMag
00087             mag = Teuchos::ScalarTraits<Scalar>::magnitude(*v0_val);
00088           norm_inf = mag > norm_inf ? mag : norm_inf;
00089         }
00090       }
00091       reduct_obj.set(norm_inf);
00092     }
00094 }; // class ROpNormInf
00095 
00096 } // namespace RTOpPack
00097 
00098 #endif // RTOPPACK_ROP_NORMINF_HPP

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