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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/Navigation/INavigationPolicy.hpp"
 #include "Acts/Navigation/MultiNavigationPolicy.hpp"
 
 #include <concepts>
 #include <memory>
 
 namespace Acts {
 
 class TrackingVolume;
 class GeometryContext;
 class Logger;
 class INavigationPolicy;
 
 namespace detail {
 
 /// Concept for factory functions that create navigation policies
 /// @tparam F The factory function type
 /// @tparam Args The argument types for the factory function
 template <typename F, typename... Args>
 concept NavigationPolicyIsolatedFactoryConcept = requires(
     F f, const GeometryContext& gctx, const TrackingVolume& volume,
     const Logger& logger, Args&&... args) {
   { f(gctx, volume, logger, args...) } -> std::derived_from<INavigationPolicy>;
 
   requires NavigationPolicyConcept<decltype(f(gctx, volume, logger, args...))>;
 
   requires(std::is_copy_constructible_v<Args> && ...);
 };
 }  // namespace detail
 
 /// Base class for navigation policy factories. The factory can be assembled
 /// iteratively by using `make` followed by a number of calls to the `add`
 /// function of the helper type. Example:
 ///
 /// ```cpp
 /// auto factory = NavigationPolicyFactory{}
 ///  .add<NavigationPolicy1>(arg1, arg2)
 ///  .add<NavigationPolicy2>(/*no args*/)
 ///  .asUniquePtr();
 /// ```
 class NavigationPolicyFactory {
  private:
   /// Type alias for factory functions that create navigation policies
   using factory_type = std::function<std::unique_ptr<INavigationPolicy>(
       const GeometryContext&, const TrackingVolume&, const Logger&)>;
 
   /// Private constructor for internal use
   /// @param factories Vector of factory functions
   explicit NavigationPolicyFactory(std::vector<factory_type>&& factories)
       : m_factories(std::move(factories)) {}
 
  public:
   /// Default constructor
   NavigationPolicyFactory() = default;
 
   /// Add a navigation policy to the factory
   /// @tparam P The policy type to add
   /// @param args The arguments to pass to the policy constructor
   /// @note Arguments need to be copy constructible because the factory must be
   ///       able to execute multiple times.
   /// @return New instance of this object with the added factory for method
   ///         chaining
   template <NavigationPolicyConcept P, typename... Args>
     requires(std::is_constructible_v<P, const GeometryContext&,
                                      const TrackingVolume&, const Logger&,
                                      Args...> &&
              (std::is_copy_constructible_v<Args> && ...))
   constexpr NavigationPolicyFactory add(Args&&... args) && {
     auto factory = [=](const GeometryContext& gctx,
                        const TrackingVolume& volume, const Logger& logger) {
       return std::make_unique<P>(gctx, volume, logger, args...);
     };
 
     m_factories.push_back(std::move(factory));
     return std::move(*this);
   }
 
   /// Add a policy created by a factory function
   /// @tparam Fn The type of the function to construct the policy
   /// @param fn The factory function
   /// @param args The arguments to pass to the policy factory
   /// @note Arguments need to be copy constructible because the factory must be
   ///       able to execute multiple times.
   /// @return New instance of this object with the added factory for method
   ///         chaining
   template <typename Fn, typename... Args>
     requires(detail::NavigationPolicyIsolatedFactoryConcept<Fn, Args...>)
   constexpr NavigationPolicyFactory add(Fn&& fn, Args&&... args) && {
     auto factory = [=](const GeometryContext& gctx,
                        const TrackingVolume& volume, const Logger& logger) {
       using policy_type = decltype(fn(gctx, volume, logger, args...));
       return std::make_unique<policy_type>(fn(gctx, volume, logger, args...));
     };
 
     m_factories.push_back(std::move(factory));
     return std::move(*this);
   }
 
   /// Move the factory into a unique pointer
   /// @return A unique pointer to the factory
   std::unique_ptr<NavigationPolicyFactory> asUniquePtr() && {
     return std::make_unique<NavigationPolicyFactory>(std::move(*this));
   }
 
   /// Construct a multi-navigation policy using the registered factories
   /// @param gctx The geometry context
   /// @param volume The tracking volume
   /// @param logger The logger
   /// @return A unique pointer to the constructed MultiNavigationPolicy
   /// @throws std::runtime_error if no factories are registered
   std::unique_ptr<MultiNavigationPolicy> operator()(
       const GeometryContext& gctx, const TrackingVolume& volume,
       const Logger& logger) const {
     if (m_factories.empty()) {
       throw std::runtime_error(
           "No factories registered in the navigation policy factory");
     }
 
     std::vector<std::unique_ptr<INavigationPolicy>> policies;
     policies.reserve(m_factories.size());
     for (auto& factory : m_factories) {
       policies.push_back(factory(gctx, volume, logger));
     }
 
     return std::make_unique<MultiNavigationPolicy>(std::move(policies));
   }
 
   /// Construct a navigation policy using the factories (alias for operator())
   /// @param gctx The geometry context
   /// @param volume The tracking volume
   /// @param logger The logger
   /// @return A unique pointer to the constructed navigation policy
   std::unique_ptr<INavigationPolicy> build(const GeometryContext& gctx,
                                            const TrackingVolume& volume,
                                            const Logger& logger) const {
     return operator()(gctx, volume, logger);
   }
 
  private:
   /// Vector of factory functions to create navigation policies
   std::vector<factory_type> m_factories;
 };
 
 }  // namespace Acts

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