At 19:42 29/04/2005, you wrote:
"Daniel Frey" <d.frey@gmx.de> wrote in message news:d4tshu$h4t$1@sea.gmane.org...
John Torjo wrote:
I've just updated the Boost Log Library: http://torjo.com/code/logging-v132.zip
It's good to see progress on logging and what I've seen so far looks promising. However...
BOOST_LOG(app) << "testing " << i << '-' << j << '-' << k << std::endl; BOOST_LOG(dbg) << "this is a debug message, i=" << i << std::endl; BOOST_LOG(info) << "I just wanted to tell you something....";
...while I like the feeling of the stream approach from a user's perspective, there is one (IMHO important) feature that can not be implemented with it: Exception guards.
Another thing (from the same domain) that I found especially difficult to deal with in my logging implementation is "intermixed logging":
BOOST_LOG(..) << "Print result of f(): " << f();
... void f() { BOOST_LOG(..) << "Enter f()"; ... BOOST_LOG(..) << "Exit f()"; }
Now to make it properly formatter isn't trivial at all.
Gennadiy
I must admit I haven't looked at the proposed implementation due to time issues, tho I'm very interested in a logging library. Like most people have written my own... with various traces / levels and logging to a file / std out / across a tcp/ip connection etc, and hence such a library a very worthwhile addition to Boost in my opinion. But sorry I don't see what the issue is about properly formatting... perhaps you could explain a bit more please? From my point of view if you have something like; class log { public: void output(const std::string& message); // threadsafe write msg to log }; class logger { public: logger(log& l) : l(l) {} ~logger() { l.output(buffer) { friend logger& operator << (logger&, const char*); // write to buffer }; Your example would end up with Enter f() Exit f() Print result of f(): ... Regards Mark