RTFieldOffset.h

/*
 * Licensed Materials - Property of HCL and/or IBM
 * Copyright HCL Technologies Ltd. 2016, 2021. All Rights Reserved.
 * Copyright IBM Corporation 1999, 2016. All Rights Reserved.
 *
 * U.S. Government Users Restricted Rights -  Use, duplication or 
 * disclosure restricted by GSA ADP Schedule.
 */
 
#ifndef __RTFieldOffset_h__
#define __RTFieldOffset_h__ included
 
#ifdef PRAGMA
#pragma interface
#endif
 
#ifndef __RTConfig_h__
#include <RTConfig.h>
#endif
 
#include <stddef.h>
 
typedef size_t RTFieldOffset; // Used for storing byte offset for a field, and byte size of types
 
#define RTOffsetOf( type, field ) \
    ( ( reinterpret_cast<RTFieldOffset>(reinterpret_cast<char *>(&( (reinterpret_cast<type *>(sizeof( type )))->field ) )) \
            - sizeof( type )) )
 
#define RTObjectOf( type, offset, object ) \
    ( reinterpret_cast<type *>( (reinterpret_cast<char *>(object)) + (offset) ) )
 
#define RTConstObjectOf( type, offset, object ) \
    ( reinterpret_cast<const type *>( (reinterpret_cast<const char *>(object)) + (offset) ) )
 
#endif // __RTFieldOffset_h__