/*
//@HEADER
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//                        Kokkos v. 3.0
//       Copyright (2020) National Technology & Engineering
//               Solutions of Sandia, LLC (NTESS).
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// Under the terms of Contract DE-NA0003525 with NTESS,
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*/

#ifndef KOKKOS_MEMORYTRAITS_HPP
#define KOKKOS_MEMORYTRAITS_HPP

#include <impl/Kokkos_Traits.hpp>
#include <impl/Kokkos_Tags.hpp>

//----------------------------------------------------------------------------

namespace Kokkos {

/** \brief  Memory access traits for views, an extension point.
 *
 *  These traits should be orthogonal.  If there are dependencies then
 *  the MemoryTraits template must detect and enforce dependencies.
 *
 *  A zero value is the default for a View, indicating that none of
 *  these traits are present.
 */
enum MemoryTraitsFlags {
  Unmanaged    = 0x01,
  RandomAccess = 0x02,
  Atomic       = 0x04,
  Restrict     = 0x08,
  Aligned      = 0x10
};

template <unsigned T>
struct MemoryTraits {
  //! Tag this class as a kokkos memory traits:
  typedef MemoryTraits memory_traits;
#ifdef KOKKOS_ENABLE_DEPRECATED_CODE
  enum : bool {
    Unmanaged = (unsigned(0) != (T & unsigned(Kokkos::Unmanaged)))
  };
  enum : bool {
    RandomAccess = (unsigned(0) != (T & unsigned(Kokkos::RandomAccess)))
  };
  enum : bool { Atomic = (unsigned(0) != (T & unsigned(Kokkos::Atomic))) };
  enum : bool { Restrict = (unsigned(0) != (T & unsigned(Kokkos::Restrict))) };
  enum : bool { Aligned = (unsigned(0) != (T & unsigned(Kokkos::Aligned))) };
#endif
  enum : bool {
    is_unmanaged = (unsigned(0) != (T & unsigned(Kokkos::Unmanaged)))
  };
  enum : bool {
    is_random_access = (unsigned(0) != (T & unsigned(Kokkos::RandomAccess)))
  };
  enum : bool { is_atomic = (unsigned(0) != (T & unsigned(Kokkos::Atomic))) };
  enum : bool {
    is_restrict = (unsigned(0) != (T & unsigned(Kokkos::Restrict)))
  };
  enum : bool { is_aligned = (unsigned(0) != (T & unsigned(Kokkos::Aligned))) };
};

}  // namespace Kokkos

//----------------------------------------------------------------------------

namespace Kokkos {

typedef Kokkos::MemoryTraits<0> MemoryManaged;
typedef Kokkos::MemoryTraits<Kokkos::Unmanaged> MemoryUnmanaged;
typedef Kokkos::MemoryTraits<Kokkos::Unmanaged | Kokkos::RandomAccess>
    MemoryRandomAccess;

}  // namespace Kokkos

//----------------------------------------------------------------------------

namespace Kokkos {
namespace Impl {

static_assert((0 < int(KOKKOS_MEMORY_ALIGNMENT)) &&
                  (0 == (int(KOKKOS_MEMORY_ALIGNMENT) &
                         (int(KOKKOS_MEMORY_ALIGNMENT) - 1))),
              "KOKKOS_MEMORY_ALIGNMENT must be a power of two");

/** \brief Memory alignment settings
 *
 *  Sets global value for memory alignment.  Must be a power of two!
 *  Enable compatibility of views from different devices with static stride.
 *  Use compiler flag to enable overwrites.
 */
enum : unsigned {
  MEMORY_ALIGNMENT           = KOKKOS_MEMORY_ALIGNMENT,
  MEMORY_ALIGNMENT_THRESHOLD = KOKKOS_MEMORY_ALIGNMENT_THRESHOLD
};

}  // namespace Impl
}  // namespace Kokkos

#endif /* #ifndef KOKKOS_MEMORYTRAITS_HPP */
