/*
//@HEADER
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// 
//                        Kokkos v. 2.0
//              Copyright (2014) Sandia Corporation
// 
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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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 */

