StArchInfo.h

#ifndef StArchInfo_h
#define StArchInfo_h

#include <stdlib.h>

#include "TNamed.h"

#if !defined(__LITTLE_ENDIAN)
# define __LITTLE_ENDIAN 1234
#endif
#if !defined(__BIG_ENDIAN)
# define __BIG_ENDIAN    4321
#endif
#if !defined(__PDP_ENDIAN)
# define __PDP_ENDIAN    3412
#endif



class StArchInfo :public TNamed {
 public:
   StArchInfo();
   ~StArchInfo();


   Bool_t isBigEndian();
   Bool_t isLittleEndian();
   Int_t  Endian(); 
   
   template<typename T> static long align(const T &)
   {
       return align<T>();
   }
   

   template<typename T> static int align()
   {
      static int done = -1;
      if (done<0) {
         struct { char c; T test; } probe;
         done =  ((char*)&probe.test)-&probe.c;
      }
      return done;
   }
   

   template <typename C, typename T> static int padding(const T&offset)
   {
      long offchar = (long)&offset;
      long  alg = align<C>();
      return  int((alg + ((offchar - 1) & ~(alg - 1))) - offchar);
   }


   template <typename T, typename C> static int padding(const T&offset, const C&)
   {
      return padding<C,T>(offset);
   }
 private:
   Int_t fEndian;
   
   ClassDef(StArchInfo,0)
};

#endif