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diff --git a/source/blender/simulation/intern/simulation_solver.hh b/source/blender/simulation/intern/simulation_solver.hh
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+++ b/source/blender/simulation/intern/simulation_solver.hh
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+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __SIM_SIMULATION_SOLVER_HH__
+#define __SIM_SIMULATION_SOLVER_HH__
+
+#include "simulation_collect_influences.hh"
+
+struct Depsgraph;
+
+namespace blender::sim {
+
+void initialize_simulation_states(Simulation &simulation,
+                                  Depsgraph &depsgraph,
+                                  const SimulationInfluences &influences,
+                                  const bke::PersistentDataHandleMap &handle_map);
+
+void solve_simulation_time_step(Simulation &simulation,
+                                Depsgraph &depsgraph,
+                                const SimulationInfluences &influences,
+                                const bke::PersistentDataHandleMap &handle_map,
+                                const DependencyAnimations &dependency_animations,
+                                float time_step);
+
+}  // namespace blender::sim
+
+#endif /* __SIM_SIMULATION_SOLVER_HH__ */