Internals.hpp

Go to the documentation of this file.

#ifndef MB_INTERNALS_HPP
#define MB_INTERNALS_HPP

#ifdef WIN32
#pragma warning(disable : 4786)
#endif

#ifndef IS_BUILDING_MB
#error "Internals.hpp isn't supposed to be included into an application"
#endif

#include "moab/Types.hpp"
#include <assert.h>

namespace moab {

#define MB_TYPE_WIDTH 4
#define MB_ID_WIDTH (8*sizeof(EntityHandle)-MB_TYPE_WIDTH)
#define MB_TYPE_MASK ((EntityHandle)0xF << MB_ID_WIDTH)
//             2^MB_TYPE_WIDTH-1 ------^

#define MB_START_ID ((EntityID)1)        //!< All entity id's currently start at 1
#define MB_END_ID ((EntityID)MB_ID_MASK) //!< Last id is the complement of the MASK
#define MB_ID_MASK (~MB_TYPE_MASK)

inline EntityHandle CREATE_HANDLE(const unsigned type, const EntityID id, int& err) 
{
  err = 0; //< Assume that there is a real error value defined somewhere

  if (id > MB_END_ID || type > MBMAXTYPE)
  {
    err = 1;   //< Assume that there is a real error value defined somewhere
    return 1;  //<You've got to return something.  What do you return?
  }
  
  return (((EntityHandle)type) << MB_ID_WIDTH)|id;
}

inline EntityHandle CREATE_HANDLE( const unsigned type, const EntityID id )
{
  assert( id <= MB_END_ID && type <= MBMAXTYPE );
  return (((EntityHandle)type) << MB_ID_WIDTH)|id;
}

inline EntityHandle FIRST_HANDLE( unsigned type )
  { return (((EntityHandle)type) << MB_ID_WIDTH)|MB_START_ID; }

inline EntityHandle LAST_HANDLE( unsigned type )
  { return ((EntityHandle)(type+1) << MB_ID_WIDTH) - 1; }

inline EntityID ID_FROM_HANDLE (EntityHandle handle)
{
  return (handle & MB_ID_MASK);
}

inline EntityType TYPE_FROM_HANDLE(EntityHandle handle) 
{
  return static_cast<EntityType> (handle >> MB_ID_WIDTH);
}

} // namespace moab

#endif