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

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