internal/ceres/callbacks.h

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

#ifndef CERES_INTERNAL_CALLBACKS_H_
#define CERES_INTERNAL_CALLBACKS_H_

#include <string>

#include "ceres/internal/port.h"
#include "ceres/iteration_callback.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();
  CallbackReturnType operator()(const IterationSummary& summary) final;

 private:
  Program* program_;
  double* parameters_;
};

// Callback for updating the externally visible state of the
// parameters vector for GradientProblemSolver.
class GradientProblemSolverStateUpdatingCallback : public IterationCallback {
 public:
  GradientProblemSolverStateUpdatingCallback(int num_parameters,
                                             const double* internal_parameters,
                                             double* user_parameters);
  virtual ~GradientProblemSolverStateUpdatingCallback();
  CallbackReturnType operator()(const IterationSummary& summary) final;

 private:
  int num_parameters_;
  const double* internal_parameters_;
  double* user_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();
  CallbackReturnType operator()(const IterationSummary& summary) final;

 private:
  const MinimizerType minimizer_type;
  const bool log_to_stdout_;
};

}  // namespace internal
}  // namespace ceres

#endif  // CERES_INTERNAL_CALLBACKS_H_