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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1997
* Sleepycat Software. All rights reserved.
*
* @(#)cxx_int.h 10.4 (Sleepycat) 8/22/97
*/
#ifndef _CXX_INT_H_
#define _CXX_INT_H_
// private data structures known to the implementation only
#include <assert.h> // used by defines below
//
// Using FooImp classes will allow the implementation to change in the
// future without any modification to user code or even to header files
// that the user includes. FooImp * is just like void * except that it
// provides a little extra protection, since you cannot randomly assign
// any old pointer to a FooImp* as you can with void *. Currently, a
// pointer to such an opaque class is always just a pointer to the
// appropriate underlying implementation struct. These are converted
// back and forth using the various overloaded wrap()/unwrap() methods.
// This is essentially a use of the "Bridge" Design Pattern.
//
// WRAPPED_CLASS implements the appropriate wrap() and unwrap() methods
// for a wrapper class that has an underlying pointer representation.
//
#define WRAPPED_CLASS(_WRAPPER_CLASS, _IMP_CLASS, _WRAPPED_TYPE) \
\
class _IMP_CLASS {}; \
\
inline _WRAPPED_TYPE unwrap(_WRAPPER_CLASS *val) \
{ \
if (!val) return 0; \
return (_WRAPPED_TYPE)(val->imp()); \
} \
\
inline const _WRAPPED_TYPE unwrapConst(const _WRAPPER_CLASS *val) \
{ \
if (!val) return 0; \
return (const _WRAPPED_TYPE)(val->imp()); \
} \
\
inline _IMP_CLASS *wrap(_WRAPPED_TYPE val) \
{ \
return (_IMP_CLASS*)val; \
}
WRAPPED_CLASS(DbLockTab, DbLockTabImp, DB_LOCKTAB*)
WRAPPED_CLASS(DbLog, DbLogImp, DB_LOG*)
WRAPPED_CLASS(DbMpool, DbMpoolImp, DB_MPOOL*)
WRAPPED_CLASS(DbMpoolFile, DbMpoolFileImp, DB_MPOOLFILE*)
WRAPPED_CLASS(Db, DbImp, DB*)
WRAPPED_CLASS(DbTxn, DbTxnImp, DB_TXN*)
WRAPPED_CLASS(DbTxnMgr, DbTxnMgrImp, DB_TXNMGR*)
// Macros that handle detected errors, in case we want to
// change the default behavior. runtime_error() throws an
// exception by default.
//
// Since it's unusual to throw an exception in a destructor,
// we have a separate macro. For now, we silently ignore such
// detected errors.
//
#define DB_ERROR(caller, ecode) \
DbEnv::runtime_error(caller, ecode)
#define DB_DESTRUCTOR_ERROR(caller, ecode) \
DbEnv::runtime_error(caller, ecode, 1)
////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////
//
// These defines are for tedious flag or field set/get access methods.
//
// Define setName() and getName() methods that twiddle
// the _flags field.
//
#define DB_FLAG_METHODS(_class, _flags, _cxx_name, _flag_name) \
\
void _class::set##_cxx_name(int onOrOff) \
{ \
if (onOrOff) \
_flags |= _flag_name; \
else \
_flags &= ~(_flag_name); \
} \
\
int _class::get##_cxx_name() const \
{ \
return (_flags & _flag_name) ? 1 : 0; \
}
#define DB_RO_ACCESS(_class, _type, _cxx_name, _field) \
\
_type _class::get_##_cxx_name() const \
{ \
return _field; \
}
#define DB_WO_ACCESS(_class, _type, _cxx_name, _field) \
\
void _class::set_##_cxx_name(_type value) \
{ \
_field = value; \
} \
#define DB_RW_ACCESS(_class, _type, _cxx_name, _field) \
DB_RO_ACCESS(_class, _type, _cxx_name, _field) \
DB_WO_ACCESS(_class, _type, _cxx_name, _field)
#endif /* !_CXX_INT_H_ */
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