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 //------------------------------- -*- C++ -*- -------------------------------//
 // Copyright Celeritas contributors: see top-level COPYRIGHT file for details
 // SPDX-License-Identifier: (Apache-2.0 OR MIT)
 //---------------------------------------------------------------------------//
 /*!
  * \file corecel/Types.hh
  * \brief Type definitions for common Celeritas functionality.
  *
  * This file includes types and properties particular to the build
  * configuration.
  */
 //---------------------------------------------------------------------------//
 #pragma once
 
 #include <cstddef>
 #include <string>
 
 #include "corecel/Config.hh"
 
 #include "Macros.hh"
 
 namespace celeritas
 {
 //---------------------------------------------------------------------------//
 #if CELER_USE_DEVICE || defined(__DOXYGEN__)
 //! Standard type for container sizes, optimized for GPU use
 using size_type = unsigned int;
 #else
 using size_type = std::size_t;
 #endif
 
 #if CELERITAS_REAL_TYPE == CELERITAS_REAL_TYPE_DOUBLE
 //! Numerical type for real numbers
 using real_type = double;
 #elif CELERITAS_REAL_TYPE == CELERITAS_REAL_TYPE_FLOAT
 using real_type = float;
 #else
 using real_type = void;
 #endif
 
 //! Equivalent to std::size_t but compatible with CUDA atomics
 using ull_int = unsigned long long int;
 
 //---------------------------------------------------------------------------//
 // ENUMERATIONS
 //---------------------------------------------------------------------------//
 //! Memory location of data
 enum class MemSpace
 {
     host,  //!< CPU memory
     device,  //!< GPU memory
     mapped,  //!< Unified virtual address space (both host and device)
     size_,
 #if defined(CELER_DEVICE_SOURCE) || defined(__DOXYGEN__)
     native = device,  //!< When compiling CUDA files, \c device else \c host
 #else
     native = host,
 #endif
 };
 
 //! Data ownership flag
 enum class Ownership
 {
     value,  //!< The collection \em owns the data
     reference,  //!< Mutable reference to data
     const_reference,  //!< Immutable reference to data
 };
 
 //---------------------------------------------------------------------------//
 //! Unit system used by Celeritas
 enum class UnitSystem
 {
     none,  //!< Invalid unit system
     cgs,  //!< Gaussian CGS
     si,  //!< International System
     clhep,  //!< Geant4 native
     size_,
     native = CELERITAS_UNITS,  //!< Compile time selected system
 };
 
 //---------------------------------------------------------------------------//
 //!@{
 //! \name Convenience typedefs for params and states.
 
 //! Managed host memory
 template<template<Ownership, MemSpace> class P>
 using HostVal = P<Ownership::value, MemSpace::host>;
 //! Immutable reference to host memory
 template<template<Ownership, MemSpace> class P>
 using HostCRef = P<Ownership::const_reference, MemSpace::host>;
 //! Mutable reference to host memory
 template<template<Ownership, MemSpace> class S>
 using HostRef = S<Ownership::reference, MemSpace::host>;
 
 //! Immutable reference to device memory
 template<template<Ownership, MemSpace> class P>
 using DeviceCRef = P<Ownership::const_reference, MemSpace::device>;
 //! Mutable reference to device memory
 template<template<Ownership, MemSpace> class S>
 using DeviceRef = S<Ownership::reference, MemSpace::device>;
 
 //! Immutable reference to native memory
 template<template<Ownership, MemSpace> class P>
 using NativeCRef = P<Ownership::const_reference, MemSpace::native>;
 //! Mutable reference to native memory
 template<template<Ownership, MemSpace> class S>
 using NativeRef = S<Ownership::reference, MemSpace::native>;
 
 template<class T, MemSpace M>
 class ObserverPtr;
 
 //! Pointer to same-memory *const* collection group
 template<template<Ownership, MemSpace> class P, MemSpace M>
 using CRefPtr = ObserverPtr<P<Ownership::const_reference, M> const, M>;
 //! Pointer to same-memory *mutable* collection group
 template<template<Ownership, MemSpace> class S, MemSpace M>
 using RefPtr = ObserverPtr<S<Ownership::reference, M>, M>;
 
 //!@}
 
 //---------------------------------------------------------------------------//
 // HELPER FUNCTIONS (HOST)
 //---------------------------------------------------------------------------//
 
 // Get a string corresponding to a memory space
 char const* to_cstring(MemSpace m);
 
 // Get a string corresponding to a unit system
 char const* to_cstring(UnitSystem);
 
 // Get a unit system corresponding to a string
 UnitSystem to_unit_system(std::string const& s);
 
 //---------------------------------------------------------------------------//
 }  // namespace celeritas

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