Christopher Jefferson wrote:
On 11 Feb 2009, at 19:28, Andrey Semashev wrote:
vicente.botet wrote:
I have some innocent questions: * Is logging thread-safe? * If yes, are the lines interleaved as it is the case for output streams? * If not could you point out how and where in the implementation this is handled? Hi again, well i have found some anwers to my questions on the document. I'll come back later on.
I'm glad you did. :)
How a log record is recognized, i.e. I don't see std::endl neither std::flush are used in the examples. How many lines result in the following example if condifiton is true (2 or 3) src::logger_mt& lg = my_logger::get(); if (lg.open_record()) { lg.strm() << "Hello "; lg.strm() << "world!"; }
That one is not valid in the current implementation. It should be replaced with:
if (lg.open_record()) lg.strm() << "Hello "; if (lg.open_record()) lg.strm() << "world!";
What would happen if someone did write the above?
Officially - unspecified behavior. In current implementation, in case if no records are open recursively, the library would open a new record itself.
I really don't think this is an acceptable limitation. Don't you think people will often write to a stream more than once in the same function?
No, I think they won't. Most of the time BOOST_LOG & co. macros will be used, and they hide this "if" internally: BOOST_LOG(lg) << "Hello";