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/usr/include/trilinos/NOX_TOpEleWiseMinSwap.hpp is in libtrilinos-nox-dev 12.12.1-5.

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// @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_TOP_ELE_WISE_MIN_SWAP_HPP
#define RTOPPACK_TOP_ELE_WISE_MIN_SWAP_HPP

#include "RTOpPack_RTOpTHelpers.hpp"
#include "Thyra_VectorBase.hpp"
#include <cmath>

namespace RTOpPack {


/** \brief Element-wise transformation operator for TOpEleWiseMinSwap. */
template<class Scalar>
class TOpEleWiseMinSwapEleWiseTransformation
{
public:
  void operator()( const Scalar &v0, Scalar &z0 ) const
    {
      if (std::abs(z0) > v0)
    z0 = v0 * (z0/std::abs(z0));
    }
};


/** \brief Element-wise product update transformation operator:
 * <tt>z0[i] *= min(v0[i],abs(z0[i]) * z0[i]/abs(z0[i]), i=0...n-1</tt>.
 */
template<class Scalar>
class TOpEleWiseMinSwap
  : public TOp_1_1_Base<Scalar, TOpEleWiseMinSwapEleWiseTransformation<Scalar> >
{
public:
  typedef TOp_1_1_Base<Scalar, TOpEleWiseMinSwapEleWiseTransformation<Scalar> > base_t;
  /** \brief . */
  TOpEleWiseMinSwap()
    : base_t(TOpEleWiseMinSwapEleWiseTransformation<Scalar>())
    {
      this->setOpNameBase("TOpEleWiseMinSwap");
    }
};


} // namespace RTOpPack


namespace Thyra {

/** \brief Element-wise min swap:
 * <tt>y(i) *= min(x(i),abs(y(i)) * y(i)/abs(y(i), i = 0...y->space()->dim()-1</tt>.
 *
 * \relates VectorBase
 */
template<class Scalar>
void ele_wise_min_swap( const ::Thyra::VectorBase<Scalar>& x,
            const Teuchos::Ptr< ::Thyra::VectorBase<Scalar> > &y )
{
  using Teuchos::tuple; using Teuchos::ptrInArg; using Teuchos::null;
  RTOpPack::TOpEleWiseMinSwap<Scalar> ele_wise_min_swap_op;
  ::Thyra::applyOp<Scalar>( ele_wise_min_swap_op, tuple(ptrInArg(x)),
    tuple(y), null );
}

}

#endif // RTOPPACK_TOP_ELE_WISE_MIN_SWAP_HPP