cxx.so

berkeley db 4.6.21的源码。berkeley db是一个简单的数据库管理系统

m4_comment([$Id: cxx.so,v 1.3 2005/12/01 03:18:53 bostic Exp $])

m4_ref_title(Upgrading m4_db Applications,
    Release 4.0: C++ ostream objects,,
    upgrade.4.0/java, upgrade.4.0/asr)

m4_p([dnl
In the 4.0 release, the m4_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 m4_db methods that used to take an
ostream object as a parameter now expect a std::ostream.  Specifically,
the following methods have changed:])

m4_indent([dnl
DbEnv::set_error_stream
Db::set_error_stream
Db::verify])

m4_p([dnl
On many platforms, the old and the new C++ styles are interchangeable;
on some platforms (notably Windows systems), 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:])

m4_indent([dnl
#include __LT__iostream.h__GT__
#include __LT__db_cxx.h__GT__
m4_blank
void foo(Db db) {
	db.set_error_stream(&cerr);
}])

m4_p([dnl
to look like this:])

m4_indent([dnl
#include __LT__iostream__GT__
#include __LT__db_cxx.h__GT__
m4_blank
using std::cerr;
m4_blank
void foo(Db db) {
	db.set_error_stream(&cerr);
}])

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