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96 lines
3.8 KiB
C++
96 lines
3.8 KiB
C++
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997, 1998, 1999, 2000
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* Sleepycat Software. All rights reserved.
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*
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* $Id: cxx_int.h,v 11.13 2000/11/21 22:56:36 dda 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 ((_WRAPPED_TYPE)((void *)(val->imp()))); \
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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 ((const _WRAPPED_TYPE)((void *)(val->constimp()))); \
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} \
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\
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inline _IMP_CLASS *wrap(_WRAPPED_TYPE val) \
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{ \
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return ((_IMP_CLASS*)((void *)val)); \
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}
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WRAPPED_CLASS(DbMpoolFile, DbMpoolFileImp, DB_MPOOLFILE*)
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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(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(caller, ecode, policy) \
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DbEnv::runtime_error(caller, ecode, policy)
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// These defines are for tedious field set/get access methods.
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//
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#define DB_RO_ACCESS(_class, _type, _cxx_name, _field) \
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\
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_type _class::get_##_cxx_name() const \
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{ \
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return (_field); \
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}
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#define DB_WO_ACCESS(_class, _type, _cxx_name, _field) \
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\
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void _class::set_##_cxx_name(_type value) \
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{ \
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_field = value; \
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} \
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#define DB_RW_ACCESS(_class, _type, _cxx_name, _field) \
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DB_RO_ACCESS(_class, _type, _cxx_name, _field) \
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DB_WO_ACCESS(_class, _type, _cxx_name, _field)
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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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