BDB 4.1.24

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BitKeeper/deleted/.del-ex_mpool.wpj~4479cfd5c45f327d:
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BitKeeper/deleted/.del-os_finit.c~19a227c6d3c78ad:
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BitKeeper/deleted/.del-log-corruption.patch~1cf2ecc7c6408d5d:
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BitKeeper/deleted/.del-Btree.pm~af6d0c5eaed4a98e:
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1 files changed, 795 insertions, 0 deletions

diff --git a/bdb/dbinc/db_cxx.in b/bdb/dbinc/db_cxx.in
new file mode 100644
index 00000000000..6752b36ec42
--- /dev/null
+++ b/bdb/dbinc/db_cxx.in
@@ -0,0 +1,795 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1997-2002
+ *	Sleepycat Software.  All rights reserved.
+ *
+ * $Id: db_cxx.in,v 11.113 2002/08/23 13:02:27 mjc Exp $
+ */
+
+#ifndef _DB_CXX_H_
+#define	_DB_CXX_H_
+//
+// C++ assumptions:
+//
+// To ensure portability to many platforms, both new and old, we make
+// few assumptions about the C++ compiler and library.  For example,
+// we do not expect STL, templates or namespaces to be available.  The
+// "newest" C++ feature used is exceptions, which are used liberally
+// to transmit error information.  Even the use of exceptions can be
+// disabled at runtime, to do so, use the DB_CXX_NO_EXCEPTIONS flags
+// with the DbEnv or Db constructor.
+//
+// C++ naming conventions:
+//
+//  - All top level class names start with Db.
+//  - All class members start with lower case letter.
+//  - All private data members are suffixed with underscore.
+//  - Use underscores to divide names into multiple words.
+//  - Simple data accessors are named with get_ or set_ prefix.
+//  - All method names are taken from names of functions in the C
+//    layer of db (usually by dropping a prefix like "db_").
+//    These methods have the same argument types and order,
+//    other than dropping the explicit arg that acts as "this".
+//
+// As a rule, each DbFoo object has exactly one underlying DB_FOO struct
+// (defined in db.h) associated with it.  In some cases, we inherit directly
+// from the DB_FOO structure to make this relationship explicit.  Often,
+// the underlying C layer allocates and deallocates these structures, so
+// there is no easy way to add any data to the DbFoo class.  When you see
+// a comment about whether data is permitted to be added, this is what
+// is going on.  Of course, if we need to add data to such C++ classes
+// in the future, we will arrange to have an indirect pointer to the
+// DB_FOO struct (as some of the classes already have).
+//
+
+////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////
+//
+// Forward declarations
+//
+
+#include <stdarg.h>
+
+@cxx_have_stdheaders@
+#ifdef HAVE_CXX_STDHEADERS
+#include <iostream>
+#define	__DB_OSTREAMCLASS	std::ostream
+#else
+#include <iostream.h>
+#define	__DB_OSTREAMCLASS	ostream
+#endif
+
+#include "db.h"
+#include "cxx_common.h"
+#include "cxx_except.h"
+
+class Db;                                        // forward
+class Dbc;                                       // forward
+class DbEnv;                                     // forward
+class DbInfo;                                    // forward
+class DbLock;                                    // forward
+class DbLogc;                                    // forward
+class DbLsn;                                     // forward
+class DbMpoolFile;                               // forward
+class DbPreplist;                                // forward
+class Dbt;                                       // forward
+class DbTxn;                                     // forward
+
+// These classes are not defined here and should be invisible
+// to the user, but some compilers require forward references.
+// There is one for each use of the DEFINE_DB_CLASS macro.
+
+class DbImp;
+class DbEnvImp;
+class DbMpoolFileImp;
+class DbTxnImp;
+
+// DEFINE_DB_CLASS defines an imp_ data member and imp() accessor.
+// The underlying type is a pointer to an opaque *Imp class, that
+// gets converted to the correct implementation class by the implementation.
+//
+// Since these defines use "private/public" labels, and leave the access
+// being "private", we always use these by convention before any data
+// members in the private section of a class.  Keeping them in the
+// private section also emphasizes that they are off limits to user code.
+//
+#define	DEFINE_DB_CLASS(name) \
+	public: class name##Imp* imp() { return (imp_); } \
+	public: const class name##Imp* constimp() const { return (imp_); } \
+	private: class name##Imp* imp_
+
+////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////
+//
+// Turn off inappropriate compiler warnings
+//
+
+#ifdef _MSC_VER
+
+// These are level 4 warnings that are explicitly disabled.
+// With Visual C++, by default you do not see above level 3 unless
+// you use /W4.  But we like to compile with the highest level
+// warnings to catch other errors.
+//
+// 4201: nameless struct/union
+//       triggered by standard include file <winnt.h>
+//
+// 4514: unreferenced inline function has been removed
+//       certain include files in MSVC define methods that are not called
+//
+#pragma warning(disable: 4201 4514)
+
+#endif
+
+// Some interfaces can be customized by allowing users to define
+// callback functions.  For performance and logistical reasons, some
+// callback functions must be declared in extern "C" blocks.  For others,
+// we allow you to declare the callbacks in C++ or C (or an extern "C"
+// block) as you wish.  See the set methods for the callbacks for
+// the choices.
+//
+extern "C" {
+	typedef void * (*db_malloc_fcn_type)
+		(size_t);
+	typedef void * (*db_realloc_fcn_type)
+		(void *, size_t);
+	typedef void (*db_free_fcn_type)
+		(void *);
+	typedef int (*bt_compare_fcn_type)          /*C++ version available*/
+		(DB *, const DBT *, const DBT *);
+	typedef size_t (*bt_prefix_fcn_type)        /*C++ version available*/
+		(DB *, const DBT *, const DBT *);
+	typedef int (*dup_compare_fcn_type)         /*C++ version available*/
+		(DB *, const DBT *, const DBT *);
+	typedef u_int32_t (*h_hash_fcn_type)        /*C++ version available*/
+		(DB *, const void *, u_int32_t);
+	typedef int (*pgin_fcn_type)
+		(DB_ENV *dbenv, db_pgno_t pgno, void *pgaddr, DBT *pgcookie);
+	typedef int (*pgout_fcn_type)
+		(DB_ENV *dbenv, db_pgno_t pgno, void *pgaddr, DBT *pgcookie);
+};
+
+////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////
+//
+// Lock classes
+//
+
+class _exported DbLock
+{
+	friend class DbEnv;
+
+public:
+	DbLock();
+	DbLock(const DbLock &);
+	DbLock &operator = (const DbLock &);
+
+protected:
+	// We can add data to this class if needed
+	// since its contained class is not allocated by db.
+	// (see comment at top)
+
+	DbLock(DB_LOCK);
+	DB_LOCK lock_;
+};
+
+////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////
+//
+// Log classes
+//
+
+class _exported DbLsn : protected DB_LSN
+{
+	friend class DbEnv;          // friendship needed to cast to base class
+	friend class DbLogc;         // friendship needed to cast to base class
+};
+
+////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////
+//
+// Memory pool classes
+//
+
+class _exported DbMpoolFile
+{
+	friend class DbEnv;
+
+private:
+	// Put this first to allow inlining with some C++ compilers (g++-2.95)
+	DEFINE_DB_CLASS(DbMpoolFile);
+
+public:
+	int close(u_int32_t flags);
+	int get(db_pgno_t *pgnoaddr, u_int32_t flags, void *pagep);
+	void last_pgno(db_pgno_t *pgnoaddr);
+	int open(const char *file, u_int32_t flags, int mode, size_t pagesize);
+	int put(void *pgaddr, u_int32_t flags);
+	void refcnt(db_pgno_t *pgnoaddr);
+	int set(void *pgaddr, u_int32_t flags);
+	int set_clear_len(u_int32_t len);
+	int set_fileid(u_int8_t *fileid);
+	int set_ftype(int ftype);
+	int set_lsn_offset(int32_t offset);
+	int set_pgcookie(DBT *dbt);
+	void set_unlink(int);
+	int sync();
+
+	virtual DB_MPOOLFILE *get_DB_MPOOLFILE()
+	{
+		return (DB_MPOOLFILE *)imp();
+	}
+
+	virtual const DB_MPOOLFILE *get_const_DB_MPOOLFILE() const
+	{
+		return (const DB_MPOOLFILE *)constimp();
+	}
+
+private:
+	// We can add data to this class if needed
+	// since it is implemented via a pointer.
+	// (see comment at top)
+
+	// Note: use DbEnv::memp_fcreate() to get pointers to a DbMpoolFile,
+	// and call DbMpoolFile::close() rather than delete to release them.
+	//
+	DbMpoolFile();
+
+	// Shut g++ up.
+protected:
+	virtual ~DbMpoolFile();
+
+private:
+	// no copying
+	DbMpoolFile(const DbMpoolFile &);
+	void operator = (const DbMpoolFile &);
+};
+
+////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////
+//
+// This is filled in and returned by the DbEnv::txn_recover() method.
+//
+
+class _exported DbPreplist
+{
+public:
+	DbTxn *txn;
+	u_int8_t gid[DB_XIDDATASIZE];
+};
+
+////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////
+//
+// Transaction classes
+//
+
+class _exported DbTxn
+{
+	friend class DbEnv;
+
+private:
+	// Put this first to allow inlining with some C++ compilers (g++-2.95)
+	DEFINE_DB_CLASS(DbTxn);
+
+public:
+	int abort();
+	int commit(u_int32_t flags);
+	int discard(u_int32_t flags);
+	u_int32_t id();
+	int prepare(u_int8_t *gid);
+	int set_timeout(db_timeout_t timeout, u_int32_t flags);
+
+	virtual DB_TXN *get_DB_TXN()
+	{
+		return (DB_TXN *)imp();
+	}
+
+	virtual const DB_TXN *get_const_DB_TXN() const
+	{
+		return (const DB_TXN *)constimp();
+	}
+
+	static DbTxn* get_DbTxn(DB_TXN *txn)
+	{
+		return (DbTxn *)txn->api_internal;
+	}
+
+	static const DbTxn* get_const_DbTxn(const DB_TXN *txn)
+	{
+		return (const DbTxn *)txn->api_internal;
+	}
+
+	// For internal use only.
+	static DbTxn* wrap_DB_TXN(DB_TXN *txn);
+
+private:
+	// We can add data to this class if needed
+	// since it is implemented via a pointer.
+	// (see comment at top)
+
+	// Note: use DbEnv::txn_begin() to get pointers to a DbTxn,
+	// and call DbTxn::abort() or DbTxn::commit rather than
+	// delete to release them.
+	//
+	DbTxn();
+	// For internal use only.
+	DbTxn(DB_TXN *txn);
+	virtual ~DbTxn();
+
+	// no copying
+	DbTxn(const DbTxn &);
+	void operator = (const DbTxn &);
+};
+
+//
+// Berkeley DB environment class.  Provides functions for opening databases.
+// User of this library can use this class as a starting point for
+// developing a DB application - derive their application class from
+// this one, add application control logic.
+//
+// Note that if you use the default constructor, you must explicitly
+// call appinit() before any other db activity (e.g. opening files)
+//
+class _exported DbEnv
+{
+	friend class Db;
+	friend class DbLock;
+	friend class DbMpoolFile;
+
+private:
+	// Put this first to allow inlining with some C++ compilers (g++-2.95)
+	DEFINE_DB_CLASS(DbEnv);
+
+public:
+	// After using this constructor, you can set any needed
+	// parameters for the environment using the set_* methods.
+	// Then call open() to finish initializing the environment
+	// and attaching it to underlying files.
+	//
+	DbEnv(u_int32_t flags);
+
+	virtual ~DbEnv();
+
+	// These methods match those in the C interface.
+	//
+	virtual int close(u_int32_t);
+	virtual int dbremove(DbTxn *txn, const char *name, const char *subdb,
+	    u_int32_t flags);
+	virtual int dbrename(DbTxn *txn, const char *name, const char *subdb,
+	    const char *newname, u_int32_t flags);
+	virtual void err(int, const char *, ...);
+	virtual void errx(const char *, ...);
+	virtual void *get_app_private() const;
+	virtual int open(const char *, u_int32_t, int);
+	virtual int remove(const char *, u_int32_t);
+	virtual int set_alloc(db_malloc_fcn_type, db_realloc_fcn_type,
+		      db_free_fcn_type);
+	virtual void set_app_private(void *);
+	virtual int set_cachesize(u_int32_t, u_int32_t, int);
+	virtual int set_data_dir(const char *);
+	virtual int set_encrypt(const char *, int);
+	virtual void set_errcall(void (*)(const char *, char *));
+	virtual void set_errfile(FILE *);
+	virtual void set_errpfx(const char *);
+	virtual int set_flags(u_int32_t, int);
+	virtual int set_feedback(void (*)(DbEnv *, int, int));
+	virtual int set_lg_bsize(u_int32_t);
+	virtual int set_lg_dir(const char *);
+	virtual int set_lg_max(u_int32_t);
+	virtual int set_lg_regionmax(u_int32_t);
+	virtual int set_lk_conflicts(u_int8_t *, int);
+	virtual int set_lk_detect(u_int32_t);
+	virtual int set_lk_max(u_int32_t);
+	virtual int set_lk_max_lockers(u_int32_t);
+	virtual int set_lk_max_locks(u_int32_t);
+	virtual int set_lk_max_objects(u_int32_t);
+	virtual int set_mp_mmapsize(size_t);
+	virtual int set_paniccall(void (*)(DbEnv *, int));
+	virtual int set_rpc_server(void *, char *, long, long, u_int32_t);
+	virtual int set_shm_key(long);
+	virtual int set_timeout(db_timeout_t timeout, u_int32_t flags);
+	virtual int set_tmp_dir(const char *);
+	virtual int set_tas_spins(u_int32_t);
+	virtual int set_tx_max(u_int32_t);
+	virtual int set_app_dispatch(int (*)(DbEnv *,
+	    Dbt *, DbLsn *, db_recops));
+	virtual int set_tx_timestamp(time_t *);
+	virtual int set_verbose(u_int32_t which, int onoff);
+
+	// Version information.  A static method so it can be obtained anytime.
+	//
+	static char *version(int *major, int *minor, int *patch);
+
+	// Convert DB errors to strings
+	static char *strerror(int);
+
+	// If an error is detected and the error call function
+	// or stream is set, a message is dispatched or printed.
+	// If a prefix is set, each message is prefixed.
+	//
+	// You can use set_errcall() or set_errfile() above to control
+	// error functionality.  Alternatively, you can call
+	// set_error_stream() to force all errors to a C++ stream.
+	// It is unwise to mix these approaches.
+	//
+	virtual void set_error_stream(__DB_OSTREAMCLASS *);
+
+	// used internally
+	static void runtime_error(const char *caller, int err,
+				  int error_policy);
+	static void runtime_error_dbt(const char *caller, Dbt *dbt,
+				  int error_policy);
+	static void runtime_error_lock_get(const char *caller, int err,
+				  db_lockop_t op, db_lockmode_t mode,
+				  const Dbt *obj, DbLock lock, int index,
+				  int error_policy);
+
+	// Lock functions
+	//
+	virtual int lock_detect(u_int32_t flags, u_int32_t atype, int *aborted);
+	virtual int lock_get(u_int32_t locker, u_int32_t flags, const Dbt *obj,
+		     db_lockmode_t lock_mode, DbLock *lock);
+	virtual int lock_id(u_int32_t *idp);
+	virtual int lock_id_free(u_int32_t id);
+	virtual int lock_put(DbLock *lock);
+	virtual int lock_stat(DB_LOCK_STAT **statp, u_int32_t flags);
+	virtual int lock_vec(u_int32_t locker, u_int32_t flags, DB_LOCKREQ list[],
+		     int nlist, DB_LOCKREQ **elistp);
+
+	// Log functions
+	//
+	virtual int log_archive(char **list[], u_int32_t flags);
+	static int log_compare(const DbLsn *lsn0, const DbLsn *lsn1);
+	virtual int log_cursor(DbLogc **cursorp, u_int32_t flags);
+	virtual int log_file(DbLsn *lsn, char *namep, size_t len);
+	virtual int log_flush(const DbLsn *lsn);
+	virtual int log_put(DbLsn *lsn, const Dbt *data, u_int32_t flags);
+
+	virtual int log_stat(DB_LOG_STAT **spp, u_int32_t flags);
+
+	// Mpool functions
+	//
+	virtual int memp_fcreate(DbMpoolFile **dbmfp, u_int32_t flags);
+	virtual int memp_register(int ftype,
+			  pgin_fcn_type pgin_fcn,
+			  pgout_fcn_type pgout_fcn);
+	virtual int memp_stat(DB_MPOOL_STAT
+		      **gsp, DB_MPOOL_FSTAT ***fsp, u_int32_t flags);
+	virtual int memp_sync(DbLsn *lsn);
+	virtual int memp_trickle(int pct, int *nwrotep);
+
+	// Transaction functions
+	//
+	virtual int txn_begin(DbTxn *pid, DbTxn **tid, u_int32_t flags);
+	virtual int txn_checkpoint(u_int32_t kbyte, u_int32_t min, u_int32_t flags);
+	virtual int txn_recover(DbPreplist *preplist, long count,
+			long *retp, u_int32_t flags);
+	virtual int txn_stat(DB_TXN_STAT **statp, u_int32_t flags);
+
+	// Replication functions
+	//
+	virtual int rep_elect(int, int, u_int32_t, int *);
+	virtual int rep_process_message(Dbt *, Dbt *, int *);
+	virtual int rep_start(Dbt *, u_int32_t);
+	virtual int rep_stat(DB_REP_STAT **statp, u_int32_t flags);
+	virtual int set_rep_limit(u_int32_t, u_int32_t);
+	virtual int set_rep_transport(u_int32_t,
+	    int (*)(DbEnv *, const Dbt *, const Dbt *, int, u_int32_t));
+
+	// Conversion functions
+	//
+	virtual DB_ENV *get_DB_ENV()
+	{
+		return (DB_ENV *)imp();
+	}
+
+	virtual const DB_ENV *get_const_DB_ENV() const
+	{
+		return (const DB_ENV *)constimp();
+	}
+
+	static DbEnv* get_DbEnv(DB_ENV *dbenv)
+	{
+		return (DbEnv *)dbenv->api1_internal;
+	}
+
+	static const DbEnv* get_const_DbEnv(const DB_ENV *dbenv)
+	{
+		return (const DbEnv *)dbenv->api1_internal;
+	}
+
+	// For internal use only.
+	static DbEnv* wrap_DB_ENV(DB_ENV *dbenv);
+
+	// These are public only because they need to be called
+	// via C functions.  They should never be called by users
+	// of this class.
+	//
+	static void _stream_error_function(const char *, char *);
+	static int _app_dispatch_intercept(DB_ENV *env, DBT *dbt, DB_LSN *lsn,
+					db_recops op);
+	static void _paniccall_intercept(DB_ENV *env, int errval);
+	static void _feedback_intercept(DB_ENV *env, int opcode, int pct);
+	static int _rep_send_intercept(DB_ENV *env,
+				       const DBT *cntrl, const DBT *data,
+				       int id, u_int32_t flags);
+
+private:
+	void cleanup();
+	int initialize(DB_ENV *env);
+	int error_policy();
+
+	// For internal use only.
+	DbEnv(DB_ENV *, u_int32_t flags);
+
+	// no copying
+	DbEnv(const DbEnv &);
+	void operator = (const DbEnv &);
+
+	// instance data
+	int construct_error_;
+	u_int32_t construct_flags_;
+	int (*app_dispatch_callback_)(DbEnv *, Dbt *, DbLsn *, db_recops);
+	void (*feedback_callback_)(DbEnv *, int, int);
+	void (*paniccall_callback_)(DbEnv *, int);
+	int (*pgin_callback_)(DbEnv *dbenv, db_pgno_t pgno,
+			      void *pgaddr, Dbt *pgcookie);
+	int (*pgout_callback_)(DbEnv *dbenv, db_pgno_t pgno,
+			       void *pgaddr, Dbt *pgcookie);
+	int (*rep_send_callback_)(DbEnv *,
+	    const Dbt *, const Dbt *, int, u_int32_t);
+
+	// class data
+	static __DB_OSTREAMCLASS *error_stream_;
+};
+
+////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////
+//
+// Table access classes
+//
+
+//
+// Represents a database table = a set of keys with associated values.
+//
+class _exported Db
+{
+	friend class DbEnv;
+
+private:
+	// Put this first to allow inlining with some C++ compilers (g++-2.95)
+	DEFINE_DB_CLASS(Db);
+
+public:
+	Db(DbEnv*, u_int32_t);      // create a Db object, then call open()
+	virtual ~Db();              // does *not* call close.
+
+	// These methods exactly match those in the C interface.
+	//
+	virtual int associate(DbTxn *txn, Db *secondary,
+	    int (*callback)(Db *, const Dbt *, const Dbt *, Dbt *),
+	    u_int32_t flags);
+	virtual int close(u_int32_t flags);
+        virtual int cursor(DbTxn *txnid, Dbc **cursorp, u_int32_t flags);
+	virtual int del(DbTxn *txnid, Dbt *key, u_int32_t flags);
+	virtual void err(int, const char *, ...);
+	virtual void errx(const char *, ...);
+	virtual int fd(int *fdp);
+	virtual int get(DbTxn *txnid, Dbt *key, Dbt *data, u_int32_t flags);
+	virtual void *get_app_private() const;
+	virtual int get_byteswapped(int *);
+	virtual int get_type(DBTYPE *);
+	virtual int join(Dbc **curslist, Dbc **dbcp, u_int32_t flags);
+	virtual int key_range(DbTxn *, Dbt *, DB_KEY_RANGE *, u_int32_t);
+	virtual int open(DbTxn *txnid,
+	    const char *, const char *subname, DBTYPE, u_int32_t, int);
+	virtual int pget(DbTxn *txnid, Dbt *key, Dbt *pkey, Dbt *data,
+		 u_int32_t flags);
+	virtual int put(DbTxn *, Dbt *, Dbt *, u_int32_t);
+	virtual int remove(const char *, const char *, u_int32_t);
+	virtual int rename(const char *, const char *, const char *, u_int32_t);
+	virtual int set_alloc(db_malloc_fcn_type, db_realloc_fcn_type,
+		      db_free_fcn_type);
+	virtual void set_app_private(void *);
+	virtual int set_append_recno(int (*)(Db *, Dbt *, db_recno_t));
+	virtual int set_bt_compare(bt_compare_fcn_type); /*deprecated*/
+	virtual int set_bt_compare(int (*)(Db *, const Dbt *, const Dbt *));
+	virtual int set_bt_maxkey(u_int32_t);
+	virtual int set_bt_minkey(u_int32_t);
+	virtual int set_bt_prefix(bt_prefix_fcn_type); /*deprecated*/
+	virtual int set_bt_prefix(size_t (*)(Db *, const Dbt *, const Dbt *));
+	virtual int set_cachesize(u_int32_t, u_int32_t, int);
+	virtual int set_cache_priority(DB_CACHE_PRIORITY);
+	virtual int set_dup_compare(dup_compare_fcn_type); /*deprecated*/
+	virtual int set_dup_compare(int (*)(Db *, const Dbt *, const Dbt *));
+	virtual int set_encrypt(const char *, int);
+	virtual void set_errcall(void (*)(const char *, char *));
+	virtual void set_errfile(FILE *);
+	virtual void set_errpfx(const char *);
+	virtual int set_feedback(void (*)(Db *, int, int));
+	virtual int set_flags(u_int32_t);
+	virtual int set_h_ffactor(u_int32_t);
+	virtual int set_h_hash(h_hash_fcn_type); /*deprecated*/
+	virtual int set_h_hash(u_int32_t (*)(Db *, const void *, u_int32_t));
+	virtual int set_h_nelem(u_int32_t);
+	virtual int set_lorder(int);
+	virtual int set_pagesize(u_int32_t);
+	virtual int set_paniccall(void (*)(DbEnv *, int));
+	virtual int set_re_delim(int);
+	virtual int set_re_len(u_int32_t);
+	virtual int set_re_pad(int);
+	virtual int set_re_source(char *);
+	virtual int set_q_extentsize(u_int32_t);
+	virtual int stat(void *sp, u_int32_t flags);
+	virtual int sync(u_int32_t flags);
+	virtual int truncate(DbTxn *, u_int32_t *, u_int32_t);
+	virtual int upgrade(const char *name, u_int32_t flags);
+	virtual int verify(const char *, const char *, __DB_OSTREAMCLASS *, u_int32_t);
+
+	// These additional methods are not in the C interface, and
+	// are only available for C++.
+	//
+	virtual void set_error_stream(__DB_OSTREAMCLASS *);
+
+	virtual DB *get_DB()
+	{
+		return (DB *)imp();
+	}
+
+	virtual const DB *get_const_DB() const
+	{
+		return (const DB *)constimp();
+	}
+
+	static Db* get_Db(DB *db)
+	{
+		return (Db *)db->api_internal;
+	}
+
+	static const Db* get_const_Db(const DB *db)
+	{
+		return (const Db *)db->api_internal;
+	}
+
+private:
+	// no copying
+	Db(const Db &);
+	Db &operator = (const Db &);
+
+	void cleanup();
+	int initialize();
+	int error_policy();
+
+	// instance data
+	DbEnv *env_;
+	int construct_error_;
+	u_int32_t flags_;
+	u_int32_t construct_flags_;
+
+public:
+	// These are public only because they need to be called
+	// via C callback functions.  They should never be used by
+	// external users of this class.
+	//
+	int (*append_recno_callback_)(Db *, Dbt *, db_recno_t);
+	int (*associate_callback_)(Db *, const Dbt *, const Dbt *, Dbt *);
+	int (*bt_compare_callback_)(Db *, const Dbt *, const Dbt *);
+	size_t (*bt_prefix_callback_)(Db *, const Dbt *, const Dbt *);
+	int (*dup_compare_callback_)(Db *, const Dbt *, const Dbt *);
+	void (*feedback_callback_)(Db *, int, int);
+	u_int32_t (*h_hash_callback_)(Db *, const void *, u_int32_t);
+};
+
+//
+// A chunk of data, maybe a key or value.
+//
+class _exported Dbt : private DBT
+{
+	friend class Dbc;
+	friend class Db;
+	friend class DbEnv;
+	friend class DbLogc;
+
+public:
+
+	// key/data
+	void *get_data() const                 { return data; }
+	void set_data(void *value)             { data = value; }
+
+	// key/data length
+	u_int32_t get_size() const             { return size; }
+	void set_size(u_int32_t value)         { size = value; }
+
+	// RO: length of user buffer.
+	u_int32_t get_ulen() const             { return ulen; }
+	void set_ulen(u_int32_t value)         { ulen = value; }
+
+	// RO: get/put record length.
+	u_int32_t get_dlen() const             { return dlen; }
+	void set_dlen(u_int32_t value)         { dlen = value; }
+
+	// RO: get/put record offset.
+	u_int32_t get_doff() const             { return doff; }
+	void set_doff(u_int32_t value)         { doff = value; }
+
+	// flags
+	u_int32_t get_flags() const            { return flags; }
+	void set_flags(u_int32_t value)        { flags = value; }
+
+	// Conversion functions
+	DBT *get_DBT()                         { return (DBT *)this; }
+	const DBT *get_const_DBT() const       { return (const DBT *)this; }
+
+	static Dbt* get_Dbt(DBT *dbt)          { return (Dbt *)dbt; }
+	static const Dbt* get_const_Dbt(const DBT *dbt)
+					       { return (const Dbt *)dbt; }
+
+	Dbt(void *data, u_int32_t size);
+	Dbt();
+	~Dbt();
+	Dbt(const Dbt &);
+	Dbt &operator = (const Dbt &);
+
+private:
+	// Note: no extra data appears in this class (other than
+	// inherited from DBT) since we need DBT and Dbt objects
+	// to have interchangable pointers.
+	//
+	// When subclassing this class, remember that callback
+	// methods like bt_compare, bt_prefix, dup_compare may
+	// internally manufacture DBT objects (which later are
+	// cast to Dbt), so such callbacks might receive objects
+	// not of your subclassed type.
+};
+
+class _exported Dbc : protected DBC
+{
+	friend class Db;
+
+public:
+	int close();
+	int count(db_recno_t *countp, u_int32_t flags);
+	int del(u_int32_t flags);
+	int dup(Dbc** cursorp, u_int32_t flags);
+	int get(Dbt* key, Dbt *data, u_int32_t flags);
+	int pget(Dbt* key, Dbt* pkey, Dbt *data, u_int32_t flags);
+	int put(Dbt* key, Dbt *data, u_int32_t flags);
+
+private:
+	// No data is permitted in this class (see comment at top)
+
+	// Note: use Db::cursor() to get pointers to a Dbc,
+	// and call Dbc::close() rather than delete to release them.
+	//
+	Dbc();
+	~Dbc();
+
+	// no copying
+	Dbc(const Dbc &);
+	Dbc &operator = (const Dbc &);
+};
+
+class _exported DbLogc : protected DB_LOGC
+{
+	friend class DbEnv;
+
+public:
+	int close(u_int32_t _flags);
+	int get(DbLsn *lsn, Dbt *data, u_int32_t _flags);
+
+private:
+	// No data is permitted in this class (see comment at top)
+
+	// Note: use Db::cursor() to get pointers to a Dbc,
+	// and call Dbc::close() rather than delete to release them.
+	//
+	DbLogc();
+	~DbLogc();
+
+	// no copying
+	DbLogc(const Dbc &);
+	DbLogc &operator = (const Dbc &);
+};
+#endif /* !_DB_CXX_H_ */