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diff --git a/internal/ceres/callbacks.h b/internal/ceres/callbacks.h
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+// 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
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// 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 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();
+ virtual CallbackReturnType operator()(const IterationSummary& summary);
+ 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();
+ 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_