RTOpPack_ROpMinIndex.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_MIN_INDEX_HPP
#define RTOPPACK_ROP_MIN_INDEX_HPP


#include "RTOpPack_RTOpTHelpers.hpp"


namespace RTOpPack {


template<class Scalar>
class ROpMinIndexEleWiseReductionOp {
public:
  void operator()(const index_type i, const Scalar &v0,
    ScalarIndex<Scalar> &reduct) const
    {
      if(
        v0 < reduct.scalar
        ||
        ( v0 == reduct.scalar && i < reduct.index )
        )
      {
        reduct = ScalarIndex<Scalar>(v0, i);
      }
    }
};


template<class Scalar>
class ROpMinIndexReductObjReductionOp {
public:
  void operator()(
    const ScalarIndex<Scalar>& in_reduct, ScalarIndex<Scalar>& inout_reduct
    ) const
    {
      if(
        in_reduct.scalar < inout_reduct.scalar
        ||
        (
          in_reduct.scalar == inout_reduct.scalar
          &&
          in_reduct.index < inout_reduct.index
          )
        )
      {
        inout_reduct = in_reduct;
      }
    }
};


template<class Scalar>
class ROpMinIndex
  : public ROp_1_CoordVariantScalarReduction<
      Scalar,
      ScalarIndex<Scalar>,
      ROpMinIndexEleWiseReductionOp<Scalar>,
      ROpMinIndexReductObjReductionOp<Scalar> >
{
public:
  ROpMinIndex()
    {
      this->setOpNameBase("ROpMinIndex");
      this->initReductObjValue(
        ScalarIndex<Scalar>(+ScalarTraits<Scalar>::rmax(), -1));
    }
  ScalarIndex<Scalar> operator()(const ReductTarget& reduct_obj) const
    { return this->getRawVal(reduct_obj); }
};


} // namespace RTOpPack


#endif // RTOPPACK_ROP_MIN_INDEX_HPP