IdLinearVariableChange.h

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/*
 * (C) Copyright 2017-2018  UCAR.
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 */
 
#ifndef OOPS_GENERIC_IDLINEARVARIABLECHANGE_H_
#define OOPS_GENERIC_IDLINEARVARIABLECHANGE_H_
 
#include <ostream>
#include <string>
 
#include "oops/base/Geometry.h"
#include "oops/base/Increment.h"
#include "oops/base/LinearVariableChangeBase.h"
#include "oops/base/State.h"
#include "oops/util/Printable.h"
 
// Forward declarations
namespace eckit {
  class Configuration;
}
 
namespace oops {
 
// -----------------------------------------------------------------------------
/// No change of variable
 
template <typename MODEL>
class IdLinearVariableChange : public LinearVariableChangeBase<MODEL> {
  typedef Geometry<MODEL>            Geometry_;
  typedef Increment<MODEL>           Increment_;
  typedef State<MODEL>               State_;
 public:
  static const std::string classname() {return "oops::IdLinearVariableChange";}
 
  IdLinearVariableChange(const State_ &, const State_ &, const Geometry_ &,
                  const eckit::Configuration & conf): LinearVariableChangeBase<MODEL>(conf) {}
  virtual ~IdLinearVariableChange() {}
 
/// Perform linear transforms
  void multiply(const Increment_ & dx1, Increment_ & dx2) const override {dx2 = dx1;}
  void multiplyInverse(const Increment_ & dx1, Increment_ & dx2) const override {dx2 = dx1;}
  void multiplyAD(const Increment_ & dx1, Increment_ & dx2) const override {dx2 = dx1;}
  void multiplyInverseAD(const Increment_ & dx1, Increment_ & dx2) const override {dx2 = dx1;}
 
 private:
  void print(std::ostream & os) const override {os << "IdVariableChange";}
};
 
// -----------------------------------------------------------------------------
 
}  // namespace oops
#endif  // OOPS_GENERIC_IDLINEARVARIABLECHANGE_H_