1 files changed, 17 insertions, 2 deletions
diff --git a/extern/ceres/internal/ceres/callbacks.h b/extern/ceres/internal/ceres/callbacks.h
index 33c66df5c11..d68bf7f6301 100644
--- a/extern/ceres/internal/ceres/callbacks.h
+++ b/extern/ceres/internal/ceres/callbacks.h
@@ -46,19 +46,34 @@ class StateUpdatingCallback : public IterationCallback {
  public:
   StateUpdatingCallback(Program* program, double* parameters);
   virtual ~StateUpdatingCallback();
-  virtual CallbackReturnType operator()(const IterationSummary& summary);
+  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();
-  virtual CallbackReturnType operator()(const IterationSummary& summary);
+  CallbackReturnType operator()(const IterationSummary& summary) final;
 
  private:
   const MinimizerType minimizer_type;