Re: [Boost-users] [Log] Error with operator<< in basic_formatting_ostream

Subject: Re: [Boost-users] [Log] Error with operator<< in basic_formatting_ostream
From: Víctor Yo (rcpoetics_at_[hidden])
Date: 2013-11-07 03:10:56

As I said, I discovered that I was using incorrect names in the formatter. 
I though that I had to use the same attribute names there but it happens 
that I had to use the names associated to the formatter. I post the new 
code for better understanding:

       frontend -> set_formatter
       (
  boost::log::expressions::stream
      <<_lineID
  <<" ["<<boost::log::expressions::format_named_scope(_scope, 
boost::log::keywords::format =  "%n (%f:%l)")
  <<"] "<< boost::log::expressions::format_date_time< 
boost::posix_time::ptime >("TimeStamp", "%H:%M:%S")
  <<" <"<<boost::log::expressions::attr< severity_level >("Severity")
  <<"> "<<boost::log::expressions::message
   );

In my firts code I used attributes names but it is customary to use 
expressions names corresponding to the variables we want to use in the log. 
However, I'm still having problems with the named_scope because it is not 
working. I have nothing printed in the log messages when it is supposed to 
print the scope, the file name and the line number. Anyone could help me 
with that? Thank you very much.

El miércoles, 6 de noviembre de 2013 08:36:03 UTC+1, Víctor Yo escribió:
>
> Thank you Johan. I have read that documentation before. Anyway, I 
> discovered that one of the problems I had is that I need to use formatters 
> types asociated with the variables (or objects) I want to use in the log, 
> but I was using the variable types instead. I'm working on it and when I 
> have everything working, I will post the changes here for future reference. 
> I think I have it under control :D Thank you!
>
> El martes, 5 de noviembre de 2013 22:19:58 UTC+1, Johan Lundberg escribió:
>>
>> Hi, 
>>
>> In the tutorial here:
>>
>> http://www.boost.org/doc/libs/1_54_0/libs/log/doc/html/log/tutorial/formatters.html
>>
>> There is a link to this example:
>>
>> http://www.boost.org/doc/libs/1_54_0/libs/log/example/doc/tutorial_fmt_format.cpp
>>
>> Which I can compile fine like this:
>> g++ -DBOOST_ALL_DYN_LINK -Lboost-trunk155beta_inst/lib/ -lboost_system 
>> -lboost_log -lboost_filesystem -lboost_thread -I 
>> boost-trunk155beta_inst/include/ boost_log_format.cpp 
>>
>> Could start from that?
>>
>>     cheers, Johan
>>
>>
>> 2013/11/5 Víctor Yo <rcpo..._at_[hidden]>
>>
>>> Hi ewveryone,
>>>
>>> I'm working lately with Boost.Log (I'm a newbie) library and I want to 
>>> write a logger with some parameters and formatting options. I followed the 
>>> documentation, I created a backend and a frontend and I tried to format the 
>>> output in the frontend with the set_formatter() function. I tried with the 
>>> Lambda style and with the Boost.Format style but I'm getting an error that 
>>> I can not locate. Iwas working on it for the last two whole days but I 
>>> couldn't find a solution. It is related with the basic_formatting_ostream, 
>>> but I don't understand what that means. I defined the backend and attached 
>>> to it two streams (to a file and to cout)
>>>
>>>
>>>        typedef boost::log::sinks::text_ostream_backend our_backend;
>>>        typedef boost::log::sinks::synchronous_sink<our_backend> 
>>> our_frontend;
>>>
>>>
>>> //............................................................................................................................................
>>>
>>>        boost::shared_ptr<our_backend> backend = 
>>> boost::make_shared<our_backend>();
>>>        //Stream definitions
>>>        boost::shared_ptr<std::ostream> stream_out(&std::cout, 
>>> boost::log::empty_deleter());
>>>        boost::shared_ptr<std::ostream> stream_file(new 
>>> std::ofstream("file_logger.log"));
>>>        backend -> add_stream(stream_out);
>>>        backend -> add_stream(stream_file);
>>>
>>> Created the frontend (and wrapping the backend to it)
>>>
>>>        //Wrap the backend into the frontend and register in the core.
>>>        //The frontend provides synchronization for the backend.
>>>        boost::shared_ptr<our_frontend> frontend(new 
>>> our_frontend(backend));
>>>
>>> And now come the offending code which is supposed to format the output 
>>> (note that the first commented block was my first try). None of them works 
>>> and the error is the same in both cases:
>>>
>>> */*frontend -> set_formatter*
>>> *       (*
>>> *              boost::log::expressions::format("[%1%] %2%, File: %3%, 
>>> Line: %4%  <%5%>: %6% ")*
>>> *                      % boost::log::attributes::counter< unsigned int 
>>> >(1)*
>>> *                      % boost::log::attributes::local_clock()*
>>> *                      % boost::log::expressions::attr< severity_level 
>>> >("Severity")*
>>> *                      % boost::log::expressions::message*
>>> *       );*/*
>>>
>>>        //We are going to define the formatter in a different style to 
>>> try to get formatted output
>>>        frontend -> set_formatter
>>>        (
>>>   boost::log::expressions::stream
>>>    << boost::log::attributes::counter< unsigned int >(1)
>>>   <<" ["<< boost::log::attributes::local_clock()
>>>   <<"] <"<< boost::log::expressions::attr< severity_level >("Severity")
>>>   <<"> "<< boost::log::expressions::message
>>>    );
>>>
>>> The error I get is the next one:
>>>
>>> */home/victor/Programacion/workspace/opice/build-parallel/../libs/include/boost/log/utility/formatting_ostream.hpp:664:5: 
>>> error: no match for ‘operator<<’ in ‘(& 
>>> strm)->boost::log::v2_mt_posix::basic_formatting_ostream<CharT, TraitsT, 
>>> AllocatorT>::stream [with CharT = char, TraitsT = std::char_traits<char>, 
>>> AllocatorT = std::allocator<char>, 
>>> boost::log::v2_mt_posix::basic_formatting_ostream<CharT, TraitsT, 
>>> AllocatorT>::ostream_type = std::basic_ostream<char>]() << value’*
>>>
>>> And I really don't know what is happening. I also included a lot of 
>>> files (I'm sure I included too much files, indeed) to be sure it was not 
>>> caused by some undefined operator or something similar. However I still 
>>> have the same problem. The includes are:
>>>
>>> #include <iostream>
>>> #include <fstream>
>>> #include <string>
>>>
>>> #include <boost/thread/shared_mutex.hpp>
>>>
>>> #include <boost/log/core.hpp>
>>> #include <boost/log/common.hpp>
>>> #include <boost/make_shared.hpp>
>>> #include <boost/log/expressions.hpp>
>>>
>>> #include <boost/log/utility/setup/file.hpp>
>>> #include <boost/log/utility/setup/console.hpp>      //puede ser 
>>> innecesario
>>> #include <boost/log/utility/setup/common_attributes.hpp>        //puede 
>>> ser innecesario
>>> #include <boost/log/utility/empty_deleter.hpp>
>>>
>>> #include<boost/thread/mutex.hpp>
>>> #include <boost/log/attributes/timer.hpp>
>>> #include <boost/log/attributes/mutable_constant.hpp>
>>> #include <boost/log/sources/severity_logger.hpp>
>>> #include <boost/log/utility/formatting_ostream.hpp>
>>>
>>> #include <boost/log/sinks/text_ostream_backend.hpp>
>>> #include <boost/log/sinks/sync_frontend.hpp>
>>>
>>> #include <boost/log/support/date_time.hpp>
>>>
>>> As you can see, they are probably redundant or innecessary but I could 
>>> rip off that files when I could get the program compiled. Now, I'm out of 
>>> ideas so any help you could bring me should be very appreciated. Thank you 
>>> in advance.
>>>
>>> Victor Hevia
>>>
>>> _______________________________________________
>>> Boost-users mailing list
>>> Boost..._at_[hidden]
>>> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>>>
>>
>>