2019-07-27 22:44:32 +08:00
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/*-
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2014-11-19 00:25:21 +08:00
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997-2004
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* Sleepycat Software. All rights reserved.
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*
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* $Id: cxx_int.h,v 11.25 2004/09/22 22:20:31 mjc Exp $
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*/
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#ifndef _CXX_INT_H_
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#define _CXX_INT_H_
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// private data structures known to the implementation only
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//
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// Using FooImp classes will allow the implementation to change in the
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// future without any modification to user code or even to header files
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// that the user includes. FooImp * is just like void * except that it
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// provides a little extra protection, since you cannot randomly assign
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// any old pointer to a FooImp* as you can with void *. Currently, a
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// pointer to such an opaque class is always just a pointer to the
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// appropriate underlying implementation struct. These are converted
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// back and forth using the various overloaded wrap()/unwrap() methods.
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// This is essentially a use of the "Bridge" Design Pattern.
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//
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// WRAPPED_CLASS implements the appropriate wrap() and unwrap() methods
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// for a wrapper class that has an underlying pointer representation.
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//
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#define WRAPPED_CLASS(_WRAPPER_CLASS, _IMP_CLASS, _WRAPPED_TYPE) \
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\
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class _IMP_CLASS {}; \
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\
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inline _WRAPPED_TYPE *unwrap(_WRAPPER_CLASS *val) \
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{ \
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if (!val) return (0); \
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return (val->get_##_WRAPPED_TYPE()); \
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} \
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\
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inline const _WRAPPED_TYPE *unwrapConst(const _WRAPPER_CLASS *val) \
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{ \
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if (!val) return (0); \
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return (val->get_const_##_WRAPPED_TYPE()); \
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}
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WRAPPED_CLASS(Db, DbImp, DB)
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WRAPPED_CLASS(DbEnv, DbEnvImp, DB_ENV)
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WRAPPED_CLASS(DbMpoolFile, DbMpoolFileImp, DB_MPOOLFILE)
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WRAPPED_CLASS(DbSequence, DbSequenceImp, DB_SEQUENCE)
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WRAPPED_CLASS(DbTxn, DbTxnImp, DB_TXN)
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// A tristate integer value used by the DB_ERROR macro below.
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// We chose not to make this an enumerated type so it can
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// be kept private, even though methods that return the
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// tristate int can be declared in db_cxx.h .
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//
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#define ON_ERROR_THROW 1
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#define ON_ERROR_RETURN 0
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#define ON_ERROR_UNKNOWN (-1)
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// Macros that handle detected errors, in case we want to
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// change the default behavior. The 'policy' is one of
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// the tristate values given above. If UNKNOWN is specified,
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// the behavior is taken from the last initialized DbEnv.
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//
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#define DB_ERROR(env, caller, ecode, policy) \
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DbEnv::runtime_error(env, caller, ecode, policy)
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#define DB_ERROR_DBT(env, caller, dbt, policy) \
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DbEnv::runtime_error_dbt(env, caller, dbt, policy)
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#define DB_OVERFLOWED_DBT(dbt) \
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(F_ISSET(dbt, DB_DBT_USERMEM) && dbt->size > dbt->ulen)
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/* values for Db::flags_ */
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#define DB_CXX_PRIVATE_ENV 0x00000001
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#endif /* !_CXX_INT_H_ */
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