BkgErr.h

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/*
 * (C) Copyright 2017-2021  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 SOCA_TRANSFORMS_BKGERR_BKGERR_H_
#define SOCA_TRANSFORMS_BKGERR_BKGERR_H_
 
#include <ostream>
#include <string>
 
#include "oops/util/DateTime.h"
#include "oops/util/Printable.h"
 
// Forward declarations
namespace eckit {
  class Configuration;
}
namespace soca {
  class State;
  class Increment;
  class Geometry;
}
 
// -----------------------------------------------------------------------------
 
namespace soca {
 
/// SOCA linear change of variable
class BkgErr: public util::Printable {
 public:
  static const std::string classname() {return "soca::BkgErr";}
 
  explicit BkgErr(const State &, const State &, const Geometry &,
                  const eckit::Configuration &);
  ~BkgErr();
 
/// Perform linear transforms
  void multiply(const Increment &, Increment &) const;
  void multiplyInverse(const Increment &, Increment &) const;
  void multiplyAD(const Increment &, Increment &) const;
  void multiplyInverseAD(const Increment &, Increment &) const;
 
 private:
  void print(std::ostream &) const override;
  int keyFtnConfig_;
};
// -----------------------------------------------------------------------------
 
}  // namespace soca
#endif  // SOCA_TRANSFORMS_BKGERR_BKGERR_H_