On Wed, 20 Aug 2008 20:36:47 +0200, Andrey Semashev <andrey.semashev@gmail.com> wrote:
[...]
If I build it with VC++ 9.0 SP1 the file test.txt contains afterwards:
[] message
Only if I use boost::log::formatters::date_time("TimeStamp") the timestamp is written.
This is not a bug. The problem is that you used attr formatter without specifying date type. The attr formatter by default supports most fundamental types and strings. For other types the attribute value type (or set of types) must be specified explicitly:
boost::log::formatters::attr< boost::posix_time::ptime >("TimeStamp")
As for the date_time formatter, it implicitly supports all date and time types defined in the library documentation, which includes ptime. That's why it worked right away.
Thanks for the explanation! I'm not sure if I had found out without your help. I don't know about others but maybe my questions here help to improve the (already pretty good) documentation. Or is this explained already somewhere that I just missed it? Boris