qdp_traits.h

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// -*- C++ -*-

 
#ifndef QDP_TRAITS_H
#define QDP_TRAITS_H
 
namespace QDP {
 
//-----------------------------------------------------------------------------
// Traits class for returning the subset-ted class name of a outer grid class
//-----------------------------------------------------------------------------
 
template<class T>
struct QDPSubTypeTrait {};
 
//-----------------------------------------------------------------------------
// Traits classes to support operations of simple scalars (floating constants, 
// etc.) on QDPTypes
//-----------------------------------------------------------------------------

template<class T>
struct WordType
{
  typedef T  Type_t;
};
 
 
//-----------------------------------------------------------------------------
// Traits Classes to support getting fixed precision versions of floating 
// precision classes
// ----------------------------------------------------------------------------
template<class T>
struct SinglePrecType
{
  typedef T Type_t; // This should never be instantiated as such
};
 
template<class T>
struct DoublePrecType
{
  typedef T Type_t; // This should never be instantiated as such
};
 
// Now we need to specialise to the bit whose precisions float
// The single prec types for both REAL32 and REAL64 are REAL32
template<>
struct SinglePrecType<REAL32>
{
  typedef REAL32 Type_t;
};
 
template<>
struct SinglePrecType<REAL64>
{
  typedef REAL32 Type_t;
};
 
// The Double prec types for both REAL32 and REAL64 are REAL64
template<>
struct DoublePrecType<REAL32>
{
  typedef REAL64 Type_t;
};
 
template<>
struct DoublePrecType<REAL64>
{
  typedef REAL64 Type_t;
};
 
  template<typename T> 
  struct DoublePrecType< multi1d< T > >
  {
    typedef multi1d< typename DoublePrecType< T >::Type_t > Type_t;
  };
 
 
 
 
 
//-----------------------------------------------------------------------------
// Constructors for simple word types
//-----------------------------------------------------------------------------

template<class T>
struct SimpleScalar {};
 

template<class T>
struct InternalScalar {};
 

template<class T>
struct PrimitiveScalar {};
 

template<class T>
struct LatticeScalar {};
 

template<class T>
struct RealScalar {};
 

template<class T>
struct NoComplex {};
 

struct Zero {};

namespace {
 Zero zero;
}
 
} // namespace QDP
 
#endif