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Berkeley DB Reference Guide:
  Upgrading Berkeley DB Applications

### Release 4.0: C++ ostream objects

In the 4.0 release, the Berkeley DB C++ API has been changed to use the ISO standard C++ API in preference to the older, less portable interfaces, where available. This means the Berkeley DB methods that used to take an ostream object as a parameter now expect a std::ostream. Specifically, the following methods have changed:

>     DbEnv::set_error_stream
>     Db::set_error_stream
>     Db::verify

On many platforms, the old and the new C++ styles are interchangeable; on some platforms (notably Win32), they are incompatible. If your code uses these methods and you have trouble with the 4.0 release, you should update code that looks like this:

>     #include <iostream.h>
>     #include <db_cxx.h>

>     void foo(Db db) {
>     	db.set_error_stream(&cerr);
>     }

to look like this:

>     #include <iostream>
>     #include <db_cxx.h>

>     using std::cerr;

>     void foo(Db db) {
>     	db.set_error_stream(&cerr);
>     }

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