// Ceres Solver - A fast non-linear least squares minimizer

// Copyright 2015 Google Inc. All rights reserved.

// http://ceres-solver.org/

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are met:

//

// * Redistributions of source code must retain the above copyright notice,

//   this list of conditions and the following disclaimer.

// * 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.

// * Neither the name of Google Inc. nor the names of its contributors may be

//   used to endorse or promote products derived from this software without

//   specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR CONTRIBUTORS BE

// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

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// Author: sameeragarwal@google.com (Sameer Agarwal)

#ifndef CERES_INTERNAL_CALLBACKS_H_

#define CERES_INTERNAL_CALLBACKS_H_

#include <string>

#include "ceres/iteration_callback.h"

#include "ceres/internal/port.h"

namespace ceres {

namespace internal {

class Program;

// Callback for updating the externally visible state of parameter

// blocks.

class StateUpdatingCallback : public IterationCallback {

 public:

  StateUpdatingCallback(Program* program, double* parameters);

  virtual ~StateUpdatingCallback();

  virtual CallbackReturnType operator()(const IterationSummary& summary);

 private:

  Program* program_;

  double* parameters_;

};

// Callback for logging the state of the minimizer to STDERR or

// STDOUT depending on the user's preferences and logging level.

class LoggingCallback : public IterationCallback {

 public:

  LoggingCallback(MinimizerType minimizer_type, bool log_to_stdout);

  virtual ~LoggingCallback();

  virtual CallbackReturnType operator()(const IterationSummary& summary);

 private:

  const MinimizerType minimizer_type;

  const bool log_to_stdout_;

};

}  // namespace internal

}  // namespace ceres

#endif  // CERES_INTERNAL_CALLBACKS_H_