ROL_NullOperator.hpp

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// @HEADER
// *****************************************************************************
//               Rapid Optimization Library (ROL) Package
//
// Copyright 2014 NTESS and the ROL contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER
 
#ifndef ROL_NULLOPERATOR_H
#define ROL_NULLOPERATOR_H
 
#include "ROL_LinearOperator.hpp"
 
 
namespace ROL {
 
template<class Real>
class NullOperator : public LinearOperator<Real> {
 
  void apply( Vector<Real> &Hv, const Vector<Real> &v, Real &tol ) const {
    Hv.zero(); 
  }
 
  void applyInverse( Vector<Real> &Hv, const Vector<Real> &v, Real &tol ) const {
    ROL_TEST_FOR_EXCEPTION( true, std::logic_error,
                                ">>> ERROR (ROL_NullOperator, applyInverse): "
                                "Null Operator has no inverse.");
  }
 
};
 
} // namespace ROL
 
 
 
 
#endif // ROL_NULLOPERATOR_H