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// ***********************************************************************
//
// Thyra: Interfaces and Support for Abstract Numerical Algorithms
// Copyright (2004) 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.
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
//
// ***********************************************************************
// @HEADER
#ifndef THYRA_ZERO_LINEAR_OP_BASE_HPP
#define THYRA_ZERO_LINEAR_OP_BASE_HPP
#include "Thyra_LinearOpBase.hpp"
namespace Thyra {
/** \brief Interface class for zero linear operators.
*
* This interface represents a zero linear operator <tt>M</tt> of the form:
\verbatim
M = 0
\endverbatim
*
* In other words, subclasses define <tt>apply()</tt> as:
*
\verbatim
y = alpha*M*x + beta*y
= beta * y
\endverbatim
*
* \ingroup Thyra_Op_Vec_extended_interfaces_code_grp
*/
template<class Scalar>
class ZeroLinearOpBase : virtual public LinearOpBase<Scalar>
{};
} // namespace Thyra
#endif // THYRA_ZERO_LINEAR_OP_BASE_HPP
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