/usr/include/ncbi-vdb/kfc/vtbl-impl.h is in libncbi-vdb-dev 2.8.1+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* PUBLIC DOMAIN NOTICE
* National Center for Biotechnology Information
*
* This software/database is a "United States Government Work" under the
* terms of the United States Copyright Act. It was written as part of
* the author's official duties as a United States Government employee and
* thus cannot be copyrighted. This software/database is freely available
* to the public for use. The National Library of Medicine and the U.S.
* Government have not placed any restriction on its use or reproduction.
*
* Although all reasonable efforts have been taken to ensure the accuracy
* and reliability of the software and data, the NLM and the U.S.
* Government do not and cannot warrant the performance or results that
* may be obtained by using this software or data. The NLM and the U.S.
* Government disclaim all warranties, express or implied, including
* warranties of performance, merchantability or fitness for any particular
* purpose.
*
* Please cite the author in any work or product based on this material.
*
* ===========================================================================
*
*/
#ifndef _h_kfc_vtbl_impl_
#define _h_kfc_vtbl_impl_
#ifndef _h_kfc_extern_
#include <kfc/extern.h>
#endif
#ifndef _h_kfc_defs_
#include <kfc/defs.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*--------------------------------------------------------------------------
* KVTable
*/
typedef struct KVTable KVTable;
typedef struct KItfTok KItfTok;
struct KItfTok
{
const char * const _name;
uint32_t idx;
};
/* use this macro to declare an extern */
#define KITFTOK_DECL( itf_name ) \
KItfTok itf_name ## _tok
/* use this macro to define the token */
#define KITFTOK_DEF( itf_name ) \
KItfTok itf_name ## _tok = { #itf_name }
typedef struct KHierCache KHierCache;
struct KHierCache
{
const KHierCache * volatile next;
size_t length;
const KVTable * parent [ 1 ];
};
struct KVTable
{
/* implementation classname */
const char * name;
/* external token
identifies interface class */
const KItfTok * itf;
/* minor version number
allows for extensions */
size_t min;
/* single-inheritance
pointer to parent */
const KVTable * parent;
/* cached linear inheritance array */
const KHierCache * cache;
};
#define KVTABLE_INITIALIZER( impl_name, itf_name, min_vers, parent_vt ) \
{ #impl_name, & itf_name ## _tok, min_vers, parent_vt }
/* Resolve
* walks a vtable's hierarchy
* builds a linear array cache of casting pointers
* dynamically configures KItfTok objects to cache their runtime offset
*/
void KVTableResolve ( const KVTable * self, ctx_t ctx );
/* Cast
* casts a vtable to a particular interface
* returns NULL if not found
*/
static __inline__
const void * KVTableCast ( const KVTable * self, ctx_t ctx, const KItfTok * itf )
{
if ( self != NULL )
{
if ( self -> cache == NULL )
KVTableResolve ( self, ctx );
assert ( itf -> idx != 0 );
assert ( itf -> idx <= ( uint32_t ) self -> cache -> length );
#if KVTABLE_NO_RTT_CHECK
return self -> cache -> parent [ itf -> idx - 1 ];
#else
self = self -> cache -> parent [ itf -> idx - 1 ];
if ( self -> itf == itf )
return self;
#endif
}
return NULL;
}
#define KVTABLE_CAST( vt, ctx, itf_name ) \
KVTableCast ( vt, ctx, & itf_name ## _tok )
#ifdef __cplusplus
}
#endif
#endif /* _h_kfc_vtbl_impl_ */
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