/usr/include/ngs/itf/VTable.hpp is in libngs-sdk-dev 1.3.0-2.
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.
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* Government disclaim all warranties, express or implied, including
* warranties of performance, merchantability or fitness for any particular
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* Please cite the author in any work or product based on this material.
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* ===========================================================================
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*/
#ifndef _hpp_ngs_itf_vtable_
#define _hpp_ngs_itf_vtable_
#ifndef _hpp_ngs_itf_error_msg_
#include <ngs/itf/ErrorMsg.hpp>
#endif
#ifndef _h_ngs_itf_vtable_
#include <ngs/itf/VTable.h>
#endif
namespace ngs
{
/*----------------------------------------------------------------------
* ItfTok
*/
struct ItfTok
{
ItfTok ( const char * name )
: itf_name ( name )
{
assert ( parent == 0 );
assert ( idx == 0 );
}
ItfTok ( const char * name, const ItfTok & dad )
: itf_name ( name )
, parent ( & dad )
{
assert ( idx == 0 );
}
/* name of the interface */
const char * itf_name;
// single-inheritance - interface hierarchy
const ItfTok * parent;
// index into linear inheritance array
uint32_t mutable volatile idx;
};
/*----------------------------------------------------------------------
* Resolve
* creates a cache of interface hierarchy
* resolves array indices of itf tokens
*/
void Resolve ( const ItfTok & itf )
throw ();
void Resolve ( const NGS_VTable * vt, const ItfTok & itf )
throw ( ErrorMsg );
/*----------------------------------------------------------------------
* Cast
* cast an NGS_VTable to the desired level
*/
inline
const void * Cast ( const NGS_VTable * vt, const ItfTok & itf )
throw ( ErrorMsg )
{
if ( vt != 0 )
{
if ( itf . idx == 0 )
Resolve ( itf );
if ( vt -> cache == 0 )
Resolve ( vt, itf );
assert ( itf . idx != 0 );
assert ( itf . idx <= ( unsigned int ) vt -> cache -> length );
if ( vt -> cache -> hier [ itf . idx - 1 ] . itf_tok == ( const void* ) & itf )
return vt -> cache -> hier [ itf . idx - 1 ] . parent;
if ( vt -> cache -> hier [ itf . idx - 1 ] . itf_tok == 0 )
{
Resolve ( vt, itf );
if ( vt -> cache -> hier [ itf . idx - 1 ] . itf_tok == ( const void* ) & itf )
return vt -> cache -> hier [ itf . idx - 1 ] . parent;
}
}
return 0;
}
}
#endif // _hpp_ngs_itf_vtable_
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