Re: [boost] [log] Questions for Andrey

From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2008-08-20 15:28:53

Boris wrote:
> On Wed, 20 Aug 2008 20:36:47 +0200, Andrey Semashev
> <andrey.semashev_at_[hidden]> 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?

I thought I mentioned it. I'll point that out in the attr formatter
description section.