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119 lines
5.3 KiB
C++
119 lines
5.3 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
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* Sleepycat Software. All rights reserved.
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*
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* @(#)cxx_int.h 10.5 (Sleepycat) 4/10/98
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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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#include <assert.h> // used by defines below
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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)(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)(val->imp()); \
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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*)val; \
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}
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WRAPPED_CLASS(DbLockTab, DbLockTabImp, DB_LOCKTAB*)
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WRAPPED_CLASS(DbLog, DbLogImp, DB_LOG*)
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WRAPPED_CLASS(DbMpool, DbMpoolImp, DB_MPOOL*)
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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(DbTxn, DbTxnImp, DB_TXN*)
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WRAPPED_CLASS(DbTxnMgr, DbTxnMgrImp, DB_TXNMGR*)
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// Macros that handle detected errors, in case we want to
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// change the default behavior. runtime_error() throws an
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// exception by default.
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//
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// Since it's unusual to throw an exception in a destructor,
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// we have a separate macro. For now, we silently ignore such
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// detected errors.
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//
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#define DB_ERROR(caller, ecode) \
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DbEnv::runtime_error(caller, ecode)
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#define DB_DESTRUCTOR_ERROR(caller, ecode) \
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DbEnv::runtime_error(caller, ecode, 1)
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////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////
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//
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// These defines are for tedious flag or field set/get access methods.
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//
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// Define setName() and getName() methods that twiddle
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// the _flags field.
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//
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#define DB_FLAG_METHODS(_class, _flags, _cxx_name, _flag_name) \
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\
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void _class::set##_cxx_name(int onOrOff) \
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{ \
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if (onOrOff) \
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_flags |= _flag_name; \
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else \
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_flags &= ~(_flag_name); \
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} \
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\
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int _class::get##_cxx_name() const \
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{ \
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return (_flags & _flag_name) ? 1 : 0; \
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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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#endif /* !_CXX_INT_H_ */
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