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Viewing changes to libdb/dbinc/cxx_int.h

  • Committer: Bazaar Package Importer
  • Author(s): Didier Roche
  • Date: 2010-05-17 17:02:06 UTC
  • mfrom: (1.1.79 upstream) (1.6.12 experimental)
  • Revision ID: james.westby@ubuntu.com-20100517170206-4ufr52vwrhh26yh0
Tags: 2.30.1-1ubuntu1
https://launchpad.net/bugs/42199
https://launchpad.net/bugs/229669
https://launchpad.net/bugs/173703
https://launchpad.net/bugs/360344
https://launchpad.net/bugs/508494
* Merge from debian experimental. Remaining change:
  (LP: #42199, #229669, #173703, #360344, #508494)
  + debian/control:
    - add Vcs-Bzr tag
    - don't use libgnome
    - Use Breaks instead of Conflicts against evolution 2.25 and earlier.
  + debian/evolution-data-server.install,
    debian/patches/45_libcamel_providers_version.patch:
    - use the upstream versioning, not a Debian-specific one 
  + debian/libedata-book1.2-dev.install, debian/libebackend-1.2-dev.install,
    debian/libcamel1.2-dev.install, debian/libedataserverui1.2-dev.install:
    - install html documentation
  + debian/rules:
    - don't build documentation it's shipped with the tarball

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libdb/dbinc/cxx_int.h
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/*-
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 * See the file LICENSE for redistribution information.
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 *
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 * Copyright (c) 1997-2002
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 *      Sleepycat Software.  All rights reserved.
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 *
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 * $Id$
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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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#define DB_ERROR_DBT(caller, dbt, policy) \
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    DbEnv::runtime_error_dbt(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_ */