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<title>Berkeley DB Reference Guide: Release 4.0: C++ ostream objects</title>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></h3></td>
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<p>
<h3 align=center>Release 4.0: C++ ostream objects</h3>
<p>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:</p>
<blockquote><pre>DbEnv::set_error_stream
Db::set_error_stream
Db::verify</pre></blockquote>
<p>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:</p>
<blockquote><pre>#include <iostream.h>
#include <db_cxx.h>
<p>
void foo(Db db) {
db.set_error_stream(&cerr);
}</pre></blockquote>
<p>to look like this:</p>
<blockquote><pre>#include <iostream>
#include <db_cxx.h>
<p>
using std::cerr;
<p>
void foo(Db db) {
db.set_error_stream(&cerr);
}</pre></blockquote>
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