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 //------------------------------- -*- C++ -*- -------------------------------//
 // Copyright Celeritas contributors: see top-level COPYRIGHT file for details
 // SPDX-License-Identifier: (Apache-2.0 OR MIT)
 //---------------------------------------------------------------------------//
 //! \file celeritas/Types.hh
 //! \brief Type definitions for simulation management
 //---------------------------------------------------------------------------//
 #pragma once
 
 #include <cstdint>
 
 #include "corecel/Config.hh"
 // IWYU pragma: begin_exports
 #include "corecel/Assert.hh"
 #include "corecel/Macros.hh"
 #include "corecel/OpaqueId.hh"
 #include "corecel/Types.hh"
 #include "corecel/sys/ThreadId.hh"
 #include "geocel/Types.hh"
 // IWYU pragma: end_exports
 
 namespace celeritas
 {
 //---------------------------------------------------------------------------//
 // TYPE ALIASES
 //---------------------------------------------------------------------------//
 
 //! Opaque index to ElementRecord in the global vector of elements
 using ElementId = OpaqueId<struct ElementRecord>;
 
 //! Zero-indexed counter for the initiating event for a track
 using EventId = OpaqueId<struct Event_>;
 
 //! Unique identifier for an event used by external applications
 using UniqueEventId = OpaqueId<struct Event_, std::uint64_t>;
 
 //! Opaque index to IsotopeRecord in a vector
 using IsotopeId = OpaqueId<struct IsotopeRecord>;
 
 //! Opaque index of a material modified by physics options
 using PhysMatId = OpaqueId<struct PhysicsMaterial_>;
 
 //! Opaque index of model in the list of physics processes
 using ModelId = OpaqueId<struct Model_>;
 
 //! Opaque index to a material with optical properties
 using OptMatId = OpaqueId<struct OpticalMaterial_>;
 
 //! Opaque index to ParticleRecord in a vector: represents a particle type
 using ParticleId = OpaqueId<struct Particle_>;
 
 //! Opaque index of physics process
 using ProcessId = OpaqueId<struct Process_>;
 
 //! Unique ID (for an event) of a track among all primaries and secondaries
 using TrackId = OpaqueId<struct Track_>;
 
 //---------------------------------------------------------------------------//
 // (detailed type aliases)
 //---------------------------------------------------------------------------//
 
 //! Opaque index of particle-nucleon cascade channel
 using ChannelId = OpaqueId<struct Channel_>;
 
 //! Opaque index for mapping volume-specific "sensitive detector" objects
 using DetectorId = OpaqueId<struct Detector_>;
 
 //! Opaque index to one elemental component datum in a particular material
 using ElementComponentId = OpaqueId<struct MatElementComponent>;
 
 //! Opaque index to one isotopic component datum in a particular element
 using IsotopeComponentId = OpaqueId<struct ElIsotopeComponent>;
 
 //! Opaque index of a process applicable to a single particle type
 using ParticleProcessId = OpaqueId<ProcessId>;
 
 //! Opaque index of a model applicable to a single particle type
 using ParticleModelId = OpaqueId<ModelId>;
 
 //! Opaque index of electron subshell
 using SubshellId = OpaqueId<struct Subshell_>;
 
 //---------------------------------------------------------------------------//
 // ENUMERATIONS
 //---------------------------------------------------------------------------//
 //! Physical state of matter
 enum class MatterState
 {
     unspecified = 0,
     solid,
     liquid,
     gas,
     size_
 };
 
 //---------------------------------------------------------------------------//
 /*!
  * Whether a track slot is alive, inactive, or dying inside a step iteration.
  *
  * Each track slot has a state marking its transition between death and life.
  *
  * - A track slot starts as \c inactive . If not filled with a new track, it is
  *   inactive for the rest of the step iteration.
  * - When it is populated with a new particle, it is \c initializing . If an
  *   error occurs during initialization it is \c errored .
  * - During the pre-step setup, a non-errored active track slot is marked as \c
  *   alive .
  * - During along-step or post-step a track can be marked as \c errored or
  *   \c killed .
  */
 enum class TrackStatus : std::uint_least8_t
 {
     inactive = 0,  //!< No tracking in this thread slot
     initializing,  //!< Before pre-step, after initialization
     alive,  //!< Track is active and alive
     begin_dying_,
     errored = begin_dying_,  //!< Track failed during this step
     killed,  //!< Killed physically inside the step
     size_
 };
 
 //---------------------------------------------------------------------------//
 //! Differentiate between result data at the beginning and end of a step.
 enum class StepPoint
 {
     pre,
     post,
     size_
 };
 
 //---------------------------------------------------------------------------//
 /*!
  * Change the ordering or thread mapping of track slots.
  *
  * There are three categories of track sorting:
  * 1. No sorting is performed and new tracks are inserted in the nearest empty
  *    track slot. (\c none )
  * 2. The location of new track slots is biased during track initialization:
  *    charged and neutral tracks are inserted at opposite sides of the track
  *    slot vacancies. (\c init_charge )
  * 3. Tracks are \em reindexed one or more times per step so that the layout
  *    in memory is unchanged but an additional indirection maps threads onto
  *    different track slots based on particle attributes (\c reindex_status,
  *    \c reindex_particle_type ), actions (\c reindex_along_step_action,
  *    \c reindex_step_limit_action, \c reindex_both_action ).
  * 4. As a control to measure the cost of indirection, the track slots can be
  *    reindexed randomly at the beginning of execution (\c reindex_shuffle ).
  */
 enum class TrackOrder
 {
     none,  //!< Don't do any sorting: tracks are in an arbitrary order
     begin_layout_,
     //! Partition data layout of new tracks by charged vs neutral
     init_charge = begin_layout_,
     end_layout_,
     begin_reindex_ = end_layout_,
     //!< Shuffle at the start of the simulation
     reindex_shuffle = begin_reindex_,
     reindex_status,  //!< Partition by active/inactive status
     reindex_particle_type,  //!< Sort by particle type
     begin_reindex_action_,
     //! Sort only by the along-step action id
     reindex_along_step_action = begin_reindex_action_,
     reindex_step_limit_action,  //!< Sort only by the step limit action id
     reindex_both_action,  //!< Sort by along-step id, then post-step ID
     end_reindex_action_,
     end_reindex_ = end_reindex_action_,
     size_ = end_reindex_
 };
 
 //---------------------------------------------------------------------------//
 //! Algorithm used to calculate the multiple scattering step limit
 enum class MscStepLimitAlgorithm
 {
     minimal,
     safety,
     safety_plus,
     distance_to_boundary,
     size_,
 };
 
 //---------------------------------------------------------------------------//
 //! Nuclear form factor model for Coulomb scattering
 enum class NuclearFormFactorType
 {
     none,
     flat,
     exponential,
     gaussian,
     size_
 };
 
 //---------------------------------------------------------------------------//
 //! Interpolation for physics grids
 enum class InterpolationType
 {
     linear,
     poly_spline,  //!< Piecewise polynomial interpolation
     cubic_spline,  //!< Cubic spline interpolation with \f$ C^2 \f$ continuity
     size_
 };
 
 //---------------------------------------------------------------------------//
 //! Cylindrical coordinates indices
 enum class CylAxis
 {
     r = 0,
     phi,
     z,
     size_
 };
 
 //---------------------------------------------------------------------------//
 // HELPER STRUCTS
 //---------------------------------------------------------------------------//
 //! Step length and limiting action to take
 struct StepLimit
 {
     real_type step{};
     ActionId action{};
 
     //! Whether a step limit has been determined
     explicit CELER_FUNCTION operator bool() const
     {
         CELER_ASSERT(step >= 0);
         return static_cast<bool>(action);
     }
 };
 
 //---------------------------------------------------------------------------//
 // HELPER FUNCTIONS
 //---------------------------------------------------------------------------//
 
 //! Whether a track is in a consistent, valid state
 CELER_CONSTEXPR_FUNCTION bool is_track_valid(TrackStatus status)
 {
     return status != TrackStatus::inactive && status != TrackStatus::errored;
 }
 
 //---------------------------------------------------------------------------//
 // HELPER FUNCTIONS (HOST)
 //---------------------------------------------------------------------------//
 
 // Get a string corresponding to a material state
 char const* to_cstring(MatterState);
 
 // Get a string corresponding to a track stats
 char const* to_cstring(TrackStatus);
 
 // Get a string corresponding to a track ordering policy
 char const* to_cstring(TrackOrder);
 
 // Get a string corresponding to the MSC step limit algorithm
 char const* to_cstring(MscStepLimitAlgorithm value);
 
 // Get a string corresponding to the nuclear form factor model
 char const* to_cstring(NuclearFormFactorType value);
 
 // Get a string corresponding to the interpolation method
 char const* to_cstring(InterpolationType value);
 
 //---------------------------------------------------------------------------//
 }  // namespace celeritas

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