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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 "Acts/Definitions/Algebra.hpp"
 #include "Acts/Definitions/Common.hpp"
 #include "Acts/Detector/DetectorVolumeVisitorConcept.hpp"
 #include "Acts/Detector/Portal.hpp"
 #include "Acts/Detector/PortalGenerators.hpp"
 #include "Acts/Geometry/Extent.hpp"
 #include "Acts/Geometry/GeometryContext.hpp"
 #include "Acts/Geometry/GeometryIdentifier.hpp"
 #include "Acts/Geometry/VolumeBounds.hpp"
 #include "Acts/Material/IVolumeMaterial.hpp"
 #include "Acts/Navigation/NavigationDelegates.hpp"
 #include "Acts/Navigation/NavigationState.hpp"
 #include "Acts/Surfaces/BoundaryTolerance.hpp"
 #include "Acts/Surfaces/SurfaceVisitorConcept.hpp"
 #include "Acts/Utilities/BoundingBox.hpp"
 #include "Acts/Utilities/Delegate.hpp"
 #include "Acts/Utilities/Helpers.hpp"
 
 #include <algorithm>
 #include <cstddef>
 #include <memory>
 #include <stdexcept>
 #include <string>
 #include <utility>
 #include <vector>
 
 namespace Acts {
 
 class Surface;
 class IVolumeMaterial;
 class VolumeBounds;
 
 namespace Experimental {
 
 class DetectorVolume;
 class Detector;
 
 /// A detector volume description which can be:
 ///
 /// @note A detector volume holds non-const objects internally
 /// that are allowed to be modified as long as the geometry
 /// is not yet closed. Using this, material can be attached,
 /// and GeometryIdentifier can be set at construction time.
 ///
 /// @note The construction of DetectorVolumes is done via a dedicated
 /// factory, this is necessary as then the shared_ptr is non-weak and it
 /// can be registered in the portal generator for further geometry processing.
 ///
 /// @note Navigation is always done by plain pointers, while
 /// object ownership is done by shared/unique pointers.
 class DetectorVolume : public std::enable_shared_from_this<DetectorVolume> {
  public:
   /// Type alias for axis-aligned bounding box of detector volume
   using BoundingBox =
       Acts::AxisAlignedBoundingBox<Acts::Experimental::DetectorVolume, double,
                                    3>;
 
   friend class DetectorVolumeFactory;
 
   /// Nested object store that holds the internal (non-const),
   /// reference counted objects and provides an external
   /// (const raw pointer) access
   ///
   /// @tparam internal_type is the internal storage representation,
   /// has to comply with std::shared_ptr semantics
   ///
   template <typename internal_type>
   struct ObjectStore {
     /// The internal storage vector
     std::vector<internal_type> internal = {};
 
     /// The external storage vector, const raw pointer
     std::vector<const typename internal_type::element_type*> external = {};
 
     /// Store constructor
     ///
     /// @param objects are the ones copied into the internal store
     explicit ObjectStore(std::vector<internal_type> objects)
         : internal(std::move(objects)) {
       external = unpackConstSmartPointers(internal);
     }
 
     ObjectStore() = default;
   };
 
  protected:
   /// Create a detector volume - with surfaces and/or inserted volumes
   ///
   /// @param gctx the geometry context while building - for future contextual store
   /// @param name the volume name
   /// @param transform the transform defining the volume position
   /// @param bounds the volume bounds
   /// @param surfaces are the contained surfaces of this volume
   /// @param volumes are the contains volumes of this volume
   /// @param externalNavigation is a Delegate to find the associated volume
   /// @param internalNavigation the navigation state updator for surfaces/portals
   ///
   /// @note throws exception if misconfigured: no bounds
   /// @note throws exception if ghe portal general or navigation
   ///       state updator delegates are not connected
   DetectorVolume(const GeometryContext& gctx, std::string name,
                  const Transform3& transform,
                  std::shared_ptr<VolumeBounds> bounds,
                  std::vector<std::shared_ptr<Surface>> surfaces,
                  std::vector<std::shared_ptr<DetectorVolume>> volumes,
                  ExternalNavigationDelegate externalNavigation,
                  InternalNavigationDelegate internalNavigation) noexcept(false);
 
   /// Create a detector volume - empty/gap volume constructor
   ///
   /// @param gctx the geometry context while building - for future contextual store
   /// @param name the volume name
   /// @param transform the transform defining the volume position
   /// @param bounds the volume bounds
   /// @param internalNavigation the navigation state updator for surfaces/portals
   ///
   /// @note throws exception if misconfigured: no bounds
   /// @note throws exception if ghe portal general or navigation
   ///       state updator delegates are not connected
   DetectorVolume(const GeometryContext& gctx, std::string name,
                  const Transform3& transform,
                  std::shared_ptr<VolumeBounds> bounds,
                  InternalNavigationDelegate internalNavigation) noexcept(false);
 
   // === Factory Methods ===
 
   /// @fn static std::shared_ptr<DetectorVolume> makeShared(const GeometryContext& gctx, std::string name, const Transform3& transform, std::shared_ptr<VolumeBounds> bounds, std::vector<std::shared_ptr<Surface>> surfaces, std::vector<std::shared_ptr<DetectorVolume>> volumes, ExternalNavigationDelegate externalNavigation, InternalNavigationDelegate internalNavigation)
   /// @brief Protected factory method for producing memory managed instances of DetectorVolume.
   ///
   /// This overload creates a detector volume with full navigation capabilities,
   /// supporting both external navigation (to other volumes) and internal
   /// navigation (within the volume). It can contain both surfaces and
   /// sub-volumes for complex detector hierarchies.
   ///
   /// @param gctx The geometry context for this call
   /// @param name The name of the detector volume
   /// @param transform The transform3 object of the volume
   /// @param bounds Shared pointer to the volume bounds
   /// @param surfaces Vector of shared pointers to surfaces
   /// @param volumes Vector of shared pointers to sub-volumes
   /// @param externalNavigation The external navigation delegate
   /// @param internalNavigation The internal navigation delegate
   ///
   /// @return A shared pointer to the created detector volume
   ///
   /// @note This is called by the @class DetectorVolumeFactory
   /// @note This is the full-featured factory method for complex detector volumes
   /// @note This is a protected static method for controlled object creation
   static std::shared_ptr<DetectorVolume> makeShared(
       const GeometryContext& gctx, std::string name,
       const Transform3& transform, std::shared_ptr<VolumeBounds> bounds,
       std::vector<std::shared_ptr<Surface>> surfaces,
       std::vector<std::shared_ptr<DetectorVolume>> volumes,
       ExternalNavigationDelegate externalNavigation,
       InternalNavigationDelegate internalNavigation);
 
   /// @fn static std::shared_ptr<DetectorVolume> makeShared(const GeometryContext& gctx, std::string name, const Transform3& transform, std::shared_ptr<VolumeBounds> bounds, InternalNavigationDelegate internalNavigation)
   /// @brief Protected factory method for producing memory managed instances of DetectorVolume.
   ///
   /// This overload creates a simpler detector volume with only internal
   /// navigation capabilities. It is suitable for volumes that don't need
   /// to navigate to other volumes or contain complex sub-structures.
   ///
   /// @param gctx The geometry context for this call
   /// @param name The name of the detector volume
   /// @param transform The transform3 object of the volume
   /// @param bounds Shared pointer to the volume bounds
   /// @param internalNavigation The internal navigation delegate
   ///
   /// @return A shared pointer to the created detector volume
   ///
   /// @note This is called by the @class DetectorVolumeFactory
   /// @note This is the simplified factory method for basic detector volumes
   /// @note This is a protected static method for controlled object creation
   static std::shared_ptr<DetectorVolume> makeShared(
       const GeometryContext& gctx, std::string name,
       const Transform3& transform, std::shared_ptr<VolumeBounds> bounds,
       InternalNavigationDelegate internalNavigation);
 
  public:
   /// Retrieve a @c std::shared_ptr for this surface (non-const version)
   ///
   /// @note Will error if this was not created through the @c makeShared factory
   ///       since it needs access to the original reference. In C++14 this is
   ///       undefined behavior (but most likely implemented as a @c bad_weak_ptr
   ///       exception), in C++17 it is defined as that exception.
   /// @note Only call this if you need shared ownership of this object.
   ///
   /// @return The shared pointer
   std::shared_ptr<DetectorVolume> getSharedPtr();
 
   /// Retrieve a @c std::shared_ptr for this surface (const version)
   ///
   /// @note Will error if this was not created through the @c makeShared factory
   ///       since it needs access to the original reference. In C++14 this is
   ///       undefined behavior, but most likely implemented as a @c bad_weak_ptr
   ///       exception, in C++17 it is defined as that exception.
   /// @note Only call this if you need shared ownership of this object.
   ///
   /// @return The shared pointer
   std::shared_ptr<const DetectorVolume> getSharedPtr() const;
 
   /// Const access to the transform
   ///
   /// @param gctx the geometry context
   ///
   /// @note the geometry context is currently ignored, but
   ///       is a placeholder for eventually misaligned volumes
   ///
   /// @return const reference to the contextual transform
   const Transform3& transform(
       const GeometryContext& gctx = GeometryContext()) const;
 
   /// Const access to the center
   ///
   /// @param gctx the geometry context
   ///
   /// @note the geometry context is currently ignored, but
   ///       is a placeholder for eventually misaligned volumes
   ///
   /// @return a contextually created center
   Vector3 center(const GeometryContext& gctx = GeometryContext()) const;
 
   /// Const access to the volume bounds
   ///
   /// @return const reference to the volume bounds object
   const VolumeBounds& volumeBounds() const;
 
   /// Check if a point is inside this volume. Subvolumes will not be checked.
   ///
   /// @param gctx the geometry context
   /// @param position the position for the inside check
   ///
   /// @return a bool to indicate inside/outside
   bool inside(const GeometryContext& gctx, const Vector3& position) const;
 
   /// Check if a point is exclusively inside this volume i.e. this point is not
   /// inside a subvolume.
   ///
   /// @param gctx the geometry context
   /// @param position the position for the inside check
   ///
   /// @return a bool to indicate inside/outside
   bool exclusivelyInside(const GeometryContext& gctx,
                          const Vector3& position) const;
 
   /// The Extent for this volume
   ///
   /// @param gctx is the geometry context
   /// @param nseg is the number of segments to approximate
   ///
   /// @return an Extent object
   Extent extent(const GeometryContext& gctx, std::size_t nseg = 1) const;
 
   /// Initialize/update the navigation status in this environment
   ///
   /// This method calls:
   ///
   /// - the local navigation delegate for candidate surfaces
   /// - the portal navigation delegate for candidate exit portals
   /// - set the current detector volume
   ///
   /// @param gctx is the current geometry context
   /// @param nState [in,out] is the detector navigation state to be updated
   ///
   void updateNavigationState(const GeometryContext& gctx,
                              NavigationState& nState) const;
 
   /// Non-const access to the portals
   ///
   /// @return the portal shared pointer store
   std::vector<std::shared_ptr<Portal>>& portalPtrs();
 
   /// Non-const access to the surfaces
   ///
   /// @return the surfaces shared pointer store
   std::vector<std::shared_ptr<Surface>>& surfacePtrs();
 
   /// Non-const access to the volumes
   ///
   /// @return the volumes shared pointer store
   std::vector<std::shared_ptr<DetectorVolume>>& volumePtrs();
 
   /// Const access to the detector portals
   ///
   /// @note an empty vector indicates a container volume
   /// that has not been properly connected
   ///
   /// @return a vector to const Portal raw pointers
   const std::vector<const Portal*>& portals() const;
 
   /// Const access to the surfaces
   ///
   /// @note an empty vector indicates either gap volume
   /// or container volume, a non-empty vector indicates
   /// a layer volume.
   ///
   /// @return a vector to const Surface raw pointers
   const std::vector<const Surface*>& surfaces() const;
 
   /// Const access to sub volumes
   ///
   /// @note and empty vector indicates this is either a
   /// gap volume or a layer volume, in any case it means
   /// the volume is on navigation level and the portals
   /// need to be connected
   ///
   /// @return a vector to const DetectorVolume raw pointers
   const std::vector<const DetectorVolume*>& volumes() const;
 
   /// Const access to the detector volume updator
   /// @return Reference to the external navigation delegate
   const ExternalNavigationDelegate& externalNavigation() const;
 
   /// @brief Visit all reachable surfaces of the detector
   ///
   /// @tparam visitor_t Type of the callable visitor
   ///
   /// @param visitor will be called for each found surface,
   /// it will be handed down to contained volumes and portals
   template <SurfaceVisitor visitor_t>
   void visitSurfaces(visitor_t&& visitor) const {
     for (const auto& s : surfaces()) {
       visitor(s);
     }
     for (const auto& p : portals()) {
       p->visitSurface(std::forward<visitor_t>(visitor));
     }
     for (const auto& v : volumes()) {
       v->visitSurfaces(std::forward<visitor_t>(visitor));
     }
   }
 
   /// @brief Visit all reachable surfaces of the detector - non-const
   ///
   /// @tparam visitor_t Type of the callable visitor
   ///
   /// @param visitor will be called for each found surface,
   /// it will be handed down to contained volumes and portals
   template <MutableSurfaceVisitor visitor_t>
   void visitMutableSurfaces(visitor_t&& visitor) {
     for (auto& s : surfacePtrs()) {
       visitor(s.get());
     }
     for (auto& p : portalPtrs()) {
       p->visitMutableSurface(std::forward<visitor_t>(visitor));
     }
     for (auto& v : volumePtrs()) {
       v->visitMutableSurfaces(std::forward<visitor_t>(visitor));
     }
   }
 
   /// @brief Visit all reachable detector volumes of the detector
   ///
   /// @tparam visitor_t Type of the callable visitor
   ///
   /// @param visitor will be handed to each root volume,
   /// eventually contained volumes within the root volumes are
   /// handled by the root volume
   ///
   /// @note if a context is needed for the visit, the vistitor has to provide
   /// it, e.g. as a private member
   template <DetectorVolumeVisitor visitor_t>
   void visitVolumes(visitor_t&& visitor) const {
     visitor(this);
     for (const auto& v : volumes()) {
       v->visitVolumes(std::forward<visitor_t>(visitor));
     }
   }
 
   /// @brief Visit all reachable detector volumes of the detector - non-const
   ///
   /// @tparam visitor_t Type of the callable visitor
   ///
   /// @param visitor will be handed to each root volume,
   /// eventually contained volumes within the root volumes are
   /// handled by the root volume
   ///
   /// @note if a context is needed for the visit, the vistitor has to provide
   /// it, e.g. as a private member
   template <MutableDetectorVolumeVisitor visitor_t>
   void visitMutableVolumes(visitor_t&& visitor) {
     visitor(this);
     for (auto& v : volumePtrs()) {
       v->visitMutableVolumes(std::forward<visitor_t>(visitor));
     }
   }
 
   /// This method allows to udate the navigation state updator
   /// module.
   ///
   /// @param internalNavigation the new navigation state updator for surfaces
   /// @param surfaces the surfaces the new navigation state updator points to
   /// @param volumes the volumes the new navigation state updator points to
   ///
   void assignInternalNavigation(
       InternalNavigationDelegate internalNavigation,
       const std::vector<std::shared_ptr<Surface>>& surfaces = {},
       const std::vector<std::shared_ptr<DetectorVolume>>& volumes = {});
 
   /// Const access to the navigation state updator
   /// @return Reference to the internal navigation delegate
   const InternalNavigationDelegate& internalNavigation() const;
 
   /// Update a portal given a portal index
   ///
   /// @param portal the portal to be updated
   /// @param pIndex the portal index
   ///
   /// @note throws exception if portal index out of bounds
   void updatePortal(std::shared_ptr<Portal> portal,
                     unsigned int pIndex) noexcept(false);
 
   /// Final closing of portal, i.e. this sets the end of world
   void closePortals();
 
   /// Assign the volume material description
   ///
   /// This method allows to load a material description during the
   /// detector geometry building, and assigning it (potentially multiple)
   /// times to detector volumes.
   ///
   /// @param material Material description associated to this volumw
   void assignVolumeMaterial(std::shared_ptr<const IVolumeMaterial> material);
 
   /// Const access to the volume amterial
   /// @return Pointer to the volume material, nullptr if none assigned
   const IVolumeMaterial* volumeMaterial() const;
 
   /// @return the name of the volume
   const std::string& name() const;
 
   /// @return the geometry identifier
   const GeometryIdentifier& geometryId() const;
 
   /// Set the geometry identifier
   /// @note no checking is done, it will overwrite any existing id
   ///
   /// @param geoID is the geometry Id that is set to the object
   void assignGeometryId(const GeometryIdentifier& geoID);
 
   /// Assign Detector to this volume (for back navigation issues)
   /// @param detector the parenting detector class
   void assignDetector(const Detector& detector);
 
   /// Const access to the detector
   /// @return Pointer to the parent detector, nullptr if none assigned
   const Detector* detector() const;
 
   /// Get the bounding box of this detector volume
   /// @return Const reference to the bounding box
   const BoundingBox& getBoundingBox() const;
 
  private:
   /// Internal construction method that calls the portal generator
   ///
   /// @param gctx the current geometry context object, e.g. alignment
   /// @param portalGenerator the generator for portals
   ///
   /// @note throws exception if provided parameters are inconsistent
   void construct(const GeometryContext& gctx,
                  const PortalGenerator& portalGenerator) noexcept(false);
 
   // Check containment - only in debug mode
   ///
   /// @param gctx the current geometry context object, e.g. alignment
   /// @param nseg is the number of segments to approximate
   ///
   /// @return a boolean indicating if the objects are properly contained
   bool checkContainment(const GeometryContext& gctx,
                         std::size_t nseg = 1) const;
 
   /// build the bounding box
   ///
   void createBoundingBox(const GeometryContext& gctx);
 
   /// Name of the volume
   std::string m_name = "Unnamed";
 
   /// Transform to place the bolume
   Transform3 m_transform = Transform3::Identity();
 
   /// Volume boundaries
   std::shared_ptr<VolumeBounds> m_bounds = nullptr;
 
   /// Portal store (internal/external)
   ObjectStore<std::shared_ptr<Portal>> m_portals;
 
   /// Surface store (internal/external)
   ObjectStore<std::shared_ptr<Surface>> m_surfaces;
 
   /// Volume store (internal/external)
   ObjectStore<std::shared_ptr<DetectorVolume>> m_volumes;
 
   /// BoundingBox
   std::shared_ptr<const BoundingBox> m_boundingBox;
 
   ExternalNavigationDelegate m_externalNavigation;
 
   /// The navigation state updator
   InternalNavigationDelegate m_internalNavigation;
 
   /// Volume material (optional)
   std::shared_ptr<const IVolumeMaterial> m_volumeMaterial = nullptr;
 
   /// GeometryIdentifier of this volume
   GeometryIdentifier m_geometryId{0};
 
   /// The detector it belongs to
   const Detector* m_detector = nullptr;
 };
 
 /// @brief  A detector volume factory which first constructs the detector volume
 /// and then constructs the portals. This ensures that the std::shared_ptr
 /// holding the detector volume is not weak when assigning to the portals.
 ///
 /// @note Optional containment check is invoked by setting the number
 /// of segments nSeg to be greater than 0
 class DetectorVolumeFactory {
  public:
   /// Create a detector volume - from factory
   /// @param portalGenerator Generator for volume portals
   /// @param gctx Geometry context for construction
   /// @param name Name of the detector volume
   /// @param transform Volume transformation
   /// @param bounds Volume boundaries
   /// @param surfaces Collection of surfaces within the volume
   /// @param volumes Collection of sub-volumes
   /// @param externalNavigation External navigation delegate
   /// @param internalNavigation Internal navigation delegate
   /// @param nSeg Number of segments for containment check
   /// @return Shared pointer to the constructed detector volume
   static std::shared_ptr<DetectorVolume> construct(
       const PortalGenerator& portalGenerator, const GeometryContext& gctx,
       const std::string& name, const Transform3& transform,
       std::shared_ptr<VolumeBounds> bounds,
       const std::vector<std::shared_ptr<Surface>>& surfaces,
       const std::vector<std::shared_ptr<DetectorVolume>>& volumes,
       ExternalNavigationDelegate externalNavigation,
       InternalNavigationDelegate internalNavigation, int nSeg = -1) {
     auto dVolume = DetectorVolume::makeShared(
         gctx, name, transform, std::move(bounds), surfaces, volumes,
         std::move(externalNavigation), std::move(internalNavigation));
     dVolume->construct(gctx, portalGenerator);
 
     /// Volume extent is constructed from the portals
     /// So the surface/subvolume containment
     /// check has to happen here
     if (nSeg > 0 && !dVolume->checkContainment(gctx, nSeg)) {
       throw std::invalid_argument(
           "DetectorVolume: surfaces or subvolumes are not contained by volume");
     }
     return dVolume;
   }
 
   /// Create a detector volume - from factory
   /// @param portalGenerator Generator for volume portals
   /// @param gctx Geometry context for construction
   /// @param name Name of the detector volume
   /// @param transform Volume transformation
   /// @param bounds Volume boundaries
   /// @param internalNavigation Internal navigation delegate
   /// @return Shared pointer to the constructed detector volume
   static std::shared_ptr<DetectorVolume> construct(
       const PortalGenerator& portalGenerator, const GeometryContext& gctx,
       std::string name, const Transform3& transform,
       std::shared_ptr<VolumeBounds> bounds,
       InternalNavigationDelegate internalNavigation) {
     auto dVolume = DetectorVolume::makeShared(gctx, std::move(name), transform,
                                               std::move(bounds),
                                               std::move(internalNavigation));
     dVolume->construct(gctx, portalGenerator);
     return dVolume;
   }
 };
 
 /// Helper extractors: all portals
 struct AllPortalsExtractor {
   /// Extract the portals from the volume
   ///
   /// @param gctx the geometry contextfor this extraction call
   /// @param nState is the current navigation state
   ///
   /// @return a vector of raw Portal pointers
   inline static const std::vector<const Portal*> extract(
       [[maybe_unused]] const GeometryContext& gctx,
       const NavigationState& nState) {
     if (nState.currentVolume == nullptr) {
       throw std::runtime_error(
           "AllPortalsExtractor: no detector volume given.");
     }
     return nState.currentVolume->portals();
   }
 };
 
 /// Helper extractors: all surfaces
 struct AllSurfacesExtractor {
   /// Extract the surfaces from the volume
   ///
   /// @param gctx the geometry contextfor this extraction call
   /// @param nState is the current navigation state
   /// @param indices is an ignored index vector
   ///
   /// @return a vector of raw Surface pointers
   inline static const std::vector<const Surface*> extract(
       [[maybe_unused]] const GeometryContext& gctx,
       const NavigationState& nState,
       [[maybe_unused]] const std::vector<std::size_t>& indices = {}) {
     if (nState.currentVolume == nullptr) {
       throw std::runtime_error(
           "AllSurfacesExtractor: no detector volume given.");
     }
     return nState.currentVolume->surfaces();
   }
 };
 
 /// Helper extractors: indexed surfaces
 struct IndexedSurfacesExtractor {
   /// Extract the surfaces from the volume
   ///
   /// @param gctx the geometry contextfor this extraction call
   /// @param nState is the current navigation state
   /// @param indices are access indices into the surfaces store
   ///
   /// @note no out of boudns checking is done
   ///
   /// @return a vector of raw Surface pointers
   inline static const std::vector<const Surface*> extract(
       [[maybe_unused]] const GeometryContext& gctx,
       const NavigationState& nState, const std::vector<std::size_t>& indices) {
     if (nState.currentVolume == nullptr) {
       throw std::runtime_error(
           "IndexedSurfacesExtractor: no detector volume given.");
     }
     // Get the surface container
     const auto& surfaces = nState.currentVolume->surfaces();
     // The extracted surfaces
     std::vector<const Surface*> eSurfaces;
     eSurfaces.reserve(indices.size());
     std::ranges::for_each(
         indices, [&](const auto& i) { eSurfaces.push_back(surfaces[i]); });
     return eSurfaces;
   }
 };
 
 /// Helper extractors: all sub volumes of a volume
 struct AllSubVolumesExtractor {
   /// Extract the sub volumes from the volume
   ///
   /// @param gctx the geometry contextfor this extraction call
   /// @param nState is the current navigation state
   /// @param indices are access indices into the volume store (ignored)
   ///
   /// @return a vector of raw DetectorVolume pointers
   inline static const std::vector<const DetectorVolume*> extract(
       [[maybe_unused]] const GeometryContext& gctx,
       const NavigationState& nState,
       [[maybe_unused]] const std::vector<std::size_t>& indices = {}) {
     if (nState.currentVolume == nullptr) {
       throw std::runtime_error(
           "AllSubVolumesExtractor: no detector volume given.");
     }
     return nState.currentVolume->volumes();
   }
 };
 
 /// Helper extractors: indexed sub volume of a volume
 struct IndexedSubVolumesExtractor {
   /// Extract the sub volumes from the volume
   ///
   /// @param gctx the geometry contextfor this extraction call
   /// @param nState is the current navigation state
   /// @param indices are access indices into the volume store
   ///
   /// @return a vector of raw DetectorVolume pointers
   inline static const std::vector<const DetectorVolume*> extract(
       [[maybe_unused]] const GeometryContext& gctx,
       const NavigationState& nState, const std::vector<std::size_t>& indices) {
     if (nState.currentVolume == nullptr) {
       throw std::runtime_error(
           "AllSubVolumesExtractor: no detector volume given.");
     }
     // Get the sub volumes container
     const auto& volumes = nState.currentVolume->volumes();
     // The extracted volumes
     std::vector<const DetectorVolume*> eVolumes;
     eVolumes.reserve(indices.size());
     std::ranges::for_each(
         indices, [&](const auto& i) { eVolumes.push_back(volumes[i]); });
     return eVolumes;
   }
 };
 
 }  // namespace Experimental
 }  // namespace Acts

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