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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/Utilities/Concepts.hpp"
 #include "Acts/Utilities/Grid.hpp"
 #include "Acts/Utilities/Holders.hpp"
 #include "Acts/Utilities/detail/grid_helper.hpp"
 
 #include <variant>
 #include <vector>
 
 #include <boost/container/small_vector.hpp>
 
 namespace Acts {
 
 /// @class BinFinder
 /// @tparam DIM Dimension of the Grid on which the GridBinFinder will be used
 ///
 /// The BinFinder is used by the ISPGroupSelector. It can be
 /// used to find both bins that could be bottom bins as well as bins that could
 /// be top bins, which are assumed to be the same bins. Does not take
 /// interaction region into account to limit z-bins.
 template <std::size_t DIM>
 class GridBinFinder {
  public:
   static constexpr std::size_t dimCubed = Acts::detail::ipow(3, DIM);
   /// @brief Constructor
   /// @tparam args ... Input parameters provided by the user
   ///
   /// @param [in] vals The input parameters that define how many neighbours we need to find
   ///
   /// @pre The provided paramers must be of type 'int', 'std::pair<int, int>' or 'std::vector<std::pair<int, int>>'
   /// no other type is allowed. The order of these parameters must correspond to
   /// the same ordering of the axes in the grid
   template <typename... args>
   explicit GridBinFinder(args&&... vals)
     requires(
         sizeof...(args) == DIM &&
         (Concepts::same_as_any_of<std::decay_t<args>, int, std::pair<int, int>,
                                   std::vector<std::pair<int, int>>> &&
          ...))
   {
     storeValue(std::forward<args>(vals)...);
   }
 
   /// @brief Retrieve the neighbouring bins given a local position in the grid
   ///
   /// Return all bins that could contain space points that can be used with the
   /// space points in the bin with the provided indices to create seeds.
   ///
   /// @tparam stored_t The type of elements stored in the Grid
   /// @tparam Axes ... The type of the axes of the grid
   ///
   /// @param [in] locPosition The N-dimentional local position in the grid
   /// @param [in] grid The grid
   /// @return The list of neighbouring bins
   ///
   /// @pre The provided local position must be a valid local bins configuration in the grid
   template <typename stored_t, class... Axes>
   boost::container::small_vector<std::size_t, dimCubed> findBins(
       const std::array<std::size_t, DIM>& locPosition,
       const Acts::Grid<stored_t, Axes...>& grid) const;
 
  private:
   /// @brief Store the values provided by the user for each axis in the grid
   /// @tparam first_value_t Type of the first value
   /// @tparam vals ... values of the remaining values
   ///
   /// @param [in] fv The first value in the list
   /// @param [in] others The remaining values in the list
   ///
   /// @pre both first_value_t and vals ... can be only int or std::vector<std::pair<int, int>>
   /// In the second case, the number of entries of the vector of pairs MUST be
   /// equal to the number of bins in that specific axis. Empty vectors are also
   /// allowed but in this case the value will be replaced with a 1 (integer),
   /// thus instructing the code to look for neighbours in the range {-1 ,1}
   template <typename first_value_t, typename... vals>
   void storeValue(first_value_t&& fv, vals&&... others);
 
   /// @brief Get the instructions for retrieving the neighbouring bins given a local position
   ///
   /// @param [in] locPosition The requested local position
   /// @return the instructions for retrieving the neighbouring bins for this local position
   ///
   /// @pre The local position must be a valid local bins configuration for the grid
   std::array<std::pair<int, int>, DIM> getSizePerAxis(
       const std::array<std::size_t, DIM>& locPosition) const;
 
   /// @brief Check the GridBinFinder configuration is compatible with the grid
   /// by checking the values of m_values against the axes of the grid
   /// This function is called only in debug mode
   ///
   /// @tparam stored_t The type of elements stored in the Grid
   /// @tparam Axes ... The type of the axes of the grid
   ///
   /// @param [in] grid The Grid
   /// @return If the GridBinFinder is compatible with the grid
   template <typename stored_t, class... Axes>
   bool isGridCompatible(const Acts::Grid<stored_t, Axes...>& grid) const;
 
  private:
   using stored_values_t =
       std::variant<int, std::pair<int, int>, std::vector<std::pair<int, int>>>;
   /// @brief the instructions for retrieving the nieghbouring bins for each given axis in the grid
   /// These values are provided by the user and can be ints, a pair of ints or a
   /// vector of pair of ints. In the first case, the neighbours will be +/- bins
   /// from the given local bin In the second case, the user defines how many
   /// bins in both directions should be provided
   ///
   /// @pre The list of entries of the vector of pairs MUST be equal to the number of bins in that specific
   /// axis. Empty vectors are also allowed  but in this case the value will be
   /// replaced with a 1 (integer), thus instructing the code to look for
   /// neighbours in the range {-1 ,1}
   std::array<stored_values_t, DIM> m_values{};
 };
 
 }  // namespace Acts
 #include "Acts/Utilities/GridBinFinder.ipp"

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