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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1997-2002
* Sleepycat Software. All rights reserved.
*
* $Id: cxx_int.h,v 11.20 2002/01/11 15:52:23 bostic Exp $
*/
#ifndef _CXX_INT_H_
#define _CXX_INT_H_
// private data structures known to the implementation only
//
// 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)((void *)(val->imp()))); \
} \
\
inline const _WRAPPED_TYPE unwrapConst(const _WRAPPER_CLASS *val) \
{ \
if (!val) return (0); \
return ((const _WRAPPED_TYPE)((void *)(val->constimp()))); \
} \
\
inline _IMP_CLASS *wrap(_WRAPPED_TYPE val) \
{ \
return ((_IMP_CLASS*)((void *)val)); \
}
WRAPPED_CLASS(DbMpoolFile, DbMpoolFileImp, DB_MPOOLFILE*)
WRAPPED_CLASS(Db, DbImp, DB*)
WRAPPED_CLASS(DbEnv, DbEnvImp, DB_ENV*)
WRAPPED_CLASS(DbTxn, DbTxnImp, DB_TXN*)
// A tristate integer value used by the DB_ERROR macro below.
// We chose not to make this an enumerated type so it can
// be kept private, even though methods that return the
// tristate int can be declared in db_cxx.h .
//
#define ON_ERROR_THROW 1
#define ON_ERROR_RETURN 0
#define ON_ERROR_UNKNOWN (-1)
// Macros that handle detected errors, in case we want to
// change the default behavior. The 'policy' is one of
// the tristate values given above. If UNKNOWN is specified,
// the behavior is taken from the last initialized DbEnv.
//
#define DB_ERROR(caller, ecode, policy) \
DbEnv::runtime_error(caller, ecode, policy)
#define DB_ERROR_DBT(caller, dbt, policy) \
DbEnv::runtime_error_dbt(caller, dbt, policy)
#define DB_OVERFLOWED_DBT(dbt) \
(F_ISSET(dbt, DB_DBT_USERMEM) && dbt->size > dbt->ulen)
/* values for Db::flags_ */
#define DB_CXX_PRIVATE_ENV 0x00000001
#endif /* !_CXX_INT_H_ */
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