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 // This file is part of the ACTS project.
 //
 // Copyright (C) 2016 CERN for the benefit of the ACTS project
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
 #pragma once
 
 #include <type_traits>
 #include <utility>
 
 namespace Acts {
 
 class TrackingVolume;
 class Portal;
 class Surface;
 class Layer;
 
 template <typename T>
 class BoundarySurfaceT;
 
 /// @brief Visitor interface for traversing the tracking geometry hierarchy
 ///
 /// This visitor allows for const access to traverse and inspect the tracking
 /// geometry components without modifying them. It's used for operations like
 /// visualization, validation, or collecting information about the geometry
 /// structure.
 class TrackingGeometryVisitor {
  public:
   virtual ~TrackingGeometryVisitor() = 0;
 
   /// @brief Visit a tracking volume in the geometry
   /// @param volume The tracking volume being visited
   /// @note Called for each volume in the geometry hierarchy during traversal
   virtual void visitVolume(const TrackingVolume& volume);
 
   /// @brief Visit a portal (boundary between volumes)
   /// @param portal The portal being visited
   /// @note Called for each portal encountered during geometry traversal
   virtual void visitPortal(const Portal& portal);
 
   /// @brief Visit a surface in the geometry
   /// @param surface The surface being visited
   /// @note Called for each surface encountered during geometry traversal
   virtual void visitSurface(const Surface& surface);
 
   // Gen 1
   /// @brief Visit a detector layer
   /// @param layer The layer being visited
   /// @note Called for each layer encountered during geometry traversal
   virtual void visitLayer(const Layer& layer);
 
   /// @brief Visit a boundary surface between tracking volumes
   /// @param boundary The boundary surface being visited
   /// @note Called for each boundary surface encountered during geometry traversal
   virtual void visitBoundarySurface(
       const BoundarySurfaceT<TrackingVolume>& boundary);
 };
 
 /// @brief Mutable visitor interface for modifying the tracking geometry hierarchy
 ///
 /// This visitor allows for non-const access to traverse and modify the
 /// tracking geometry components. It's used for operations like geometry
 /// construction, material decoration, or geometry ID assignment.
 class TrackingGeometryMutableVisitor {
  public:
   virtual ~TrackingGeometryMutableVisitor();
 
   /// @brief Visit and potentially modify a tracking volume
   /// @param volume The tracking volume being visited
   /// @note Called for each volume in the geometry hierarchy during traversal
   virtual void visitVolume(TrackingVolume& volume);
 
   /// @brief Visit and potentially modify a portal
   /// @param portal The portal being visited
   /// @note Called for each portal encountered during geometry traversal
   virtual void visitPortal(Portal& portal);
 
   /// @brief Visit and potentially modify a surface
   /// @param surface The surface being visited
   /// @note Called for each surface encountered during geometry traversal
   virtual void visitSurface(Surface& surface);
 
   // Gen 1
   /// @brief Visit and potentially modify a detector layer
   /// @param layer The layer being visited
   /// @note Called for each layer encountered during geometry traversal
   virtual void visitLayer(Layer& layer);
 
   /// @brief Visit and potentially modify a boundary surface
   /// @param boundary The boundary surface being visited
   /// @note Called for each boundary surface encountered during geometry traversal
   virtual void visitBoundarySurface(BoundarySurfaceT<TrackingVolume>& boundary);
 };
 
 namespace detail {
 
 template <typename Callable>
 consteval bool callableWithAnyMutable() {
   return std::is_invocable_v<Callable, Surface&> ||
          std::is_invocable_v<Callable, TrackingVolume&> ||
          std::is_invocable_v<Callable, BoundarySurfaceT<TrackingVolume>&> ||
          std::is_invocable_v<Callable, Layer&> ||
          std::is_invocable_v<Callable, Portal&>;
 }
 
 template <typename Callable>
 consteval bool callableWithAnyConst() {
   return std::is_invocable_v<Callable, const Surface&> ||
          std::is_invocable_v<Callable, const TrackingVolume&> ||
          std::is_invocable_v<Callable,
                              const BoundarySurfaceT<TrackingVolume>&> ||
          std::is_invocable_v<Callable, const Layer&> ||
          std::is_invocable_v<Callable, const Portal&>;
 }
 
 template <typename Callable>
 consteval bool callableWithAny() {
   return callableWithAnyMutable<Callable>() || callableWithAnyConst<Callable>();
 }
 
 template <typename Callable>
   requires(callableWithAnyConst<Callable>())
 class TrackingGeometryLambdaVisitor : public TrackingGeometryVisitor {
  public:
   explicit TrackingGeometryLambdaVisitor(Callable callable)
       : m_callable(std::move(callable)) {}
 
   void visitSurface(const Surface& surface) override {
     if constexpr (std::is_invocable_v<Callable, const Surface&>) {
       m_callable(surface);
     }
   }
 
   void visitVolume(const TrackingVolume& volume) override {
     if constexpr (std::is_invocable_v<Callable, const TrackingVolume&>) {
       m_callable(volume);
     }
   }
 
   void visitBoundarySurface(
       const BoundarySurfaceT<TrackingVolume>& boundary) override {
     if constexpr (std::is_invocable_v<
                       Callable, const BoundarySurfaceT<TrackingVolume>&>) {
       m_callable(boundary);
     }
   }
 
   void visitLayer(const Layer& layer) override {
     if constexpr (std::is_invocable_v<Callable, const Layer&>) {
       m_callable(layer);
     }
   }
 
   void visitPortal(const Portal& portal) override {
     if constexpr (std::is_invocable_v<Callable, const Portal&>) {
       m_callable(portal);
     }
   }
 
  private:
   Callable m_callable;
 };
 
 template <typename Callable>
   requires(callableWithAnyMutable<Callable>())
 class TrackingGeometryLambdaMutableVisitor
     : public TrackingGeometryMutableVisitor {
  public:
   explicit TrackingGeometryLambdaMutableVisitor(Callable callable)
       : m_callable(std::move(callable)) {}
 
   void visitSurface(Surface& surface) override {
     if constexpr (std::is_invocable_v<Callable, Surface&>) {
       m_callable(surface);
     }
   }
 
   void visitVolume(TrackingVolume& volume) override {
     if constexpr (std::is_invocable_v<Callable, TrackingVolume&>) {
       m_callable(volume);
     }
   }
 
   void visitBoundarySurface(
       BoundarySurfaceT<TrackingVolume>& boundary) override {
     if constexpr (std::is_invocable_v<Callable,
                                       BoundarySurfaceT<TrackingVolume>&>) {
       m_callable(boundary);
     }
   }
 
   void visitLayer(Layer& layer) override {
     if constexpr (std::is_invocable_v<Callable, Layer&>) {
       m_callable(layer);
     }
   }
 
   void visitPortal(Portal& portal) override {
     if constexpr (std::is_invocable_v<Callable, Portal&>) {
       m_callable(portal);
     }
   }
 
  private:
   Callable m_callable;
 };
 
 }  // namespace detail
 
 }  // namespace Acts

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