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//                        Kokkos v. 2.0
//              Copyright (2014) 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
  };

template < unsigned T >
struct MemoryTraits {
  //! Tag this class as a kokkos memory traits:
  typedef MemoryTraits memory_traits ;

  enum { Unmanaged    = T & unsigned(Kokkos::Unmanaged) };
  enum { RandomAccess = T & unsigned(Kokkos::RandomAccess) };
  enum { Atomic       = T & unsigned(Kokkos::Atomic) };

};

} // 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 {

/** \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 { MEMORY_ALIGNMENT =
#if defined( KOKKOS_MEMORY_ALIGNMENT )
    ( 1 << Kokkos::Impl::integral_power_of_two( KOKKOS_MEMORY_ALIGNMENT ) )
#else
    ( 1 << Kokkos::Impl::integral_power_of_two( 128 ) )
#endif
  , MEMORY_ALIGNMENT_THRESHOLD = 4 
  };


} //namespace Impl
} // namespace Kokkos

#endif /* #ifndef KOKKOS_MEMORYTRAITS_HPP */

