RTOpPack_ROpMaxIndex.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_MAX_INDEX_HPP
#define RTOPPACK_ROP_MAX_INDEX_HPP

#include "RTOpPack_RTOpTHelpers.hpp"

namespace RTOpPack {

template<class Scalar>
class ROpMaxIndex : public ROpScalarIndexReductionBase<Scalar> {
public:
  ROpMaxIndex()
    :RTOpT<Scalar>("ROpMaxIndex")
    ,ROpScalarIndexReductionBase<Scalar>(-Teuchos::ScalarTraits<Scalar>::rmax(),-1)
    {}
  ScalarIndex<Scalar> operator()(const ReductTarget& reduct_obj ) const { return this->getRawVal(reduct_obj); }

  bool coord_invariant() const { return false; }
  void reduce_reduct_objs(
    const ReductTarget& in_reduct_obj, ReductTarget* inout_reduct_obj
    ) const
    {
      const ScalarIndex<Scalar> in    = this->getRawVal(in_reduct_obj);
      const ScalarIndex<Scalar> inout = this->getRawVal(*inout_reduct_obj);
      if( in.scalar > inout.scalar || (in.scalar == inout.scalar && in.index < inout.index) )
        this->setRawVal(in,inout_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
    {
      RTOP_APPLY_OP_1_0(num_vecs,sub_vecs,num_targ_vecs,targ_sub_vecs);
      const Index globalOffset = sub_vecs[0].globalOffset();
      ScalarIndex<Scalar> maxEle = this->getRawVal(*reduct_obj);
      if( v0_s == 1 ) {
        for( RTOp_index_type i = 1; i <= subDim; ++i ) {
          const Scalar &v0_i = *v0_val++;
          if( v0_i > maxEle.scalar || ( v0_i == maxEle.scalar && globalOffset + i < maxEle.index ) )
            maxEle = ScalarIndex<Scalar>(v0_i,globalOffset+i);
        }
      }
      else {
        for( RTOp_index_type i = 1; i <= subDim; ++i, v0_val += v0_s ) {
          const Scalar &v0_i = *v0_val;
          if( v0_i > maxEle.scalar || ( v0_i == maxEle.scalar && globalOffset + i < maxEle.index ) )
            maxEle = ScalarIndex<Scalar>(v0_i,globalOffset+i);
        }
      }
      this->setRawVal(maxEle,reduct_obj);
    }
}; // class ROpMaxIndex

} // namespace RTOpPack

#endif // RTOPPACK_ROP_MAX_INDEX_HPP

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