Headers to #include

When declaring the loggers

Attention:: If you want to log a message using a certain logger, that logger needs to be declared.

when using the Named Writer (an easy interface to Formatters and Destinations)

#include <boost/logging/format/named_write_fwd.hpp>

when using Formatters and Destinations

#include <boost/logging/format_fwd.hpp>

when using Logging, without Formatters/Destinations

#include <boost/logging/logging.hpp>

if in addition, if you want to do logging on a dedicated thread

// when you log messages on a dedicated thread (see writer::on_dedicated_thread class)
#include <boost/logging/writer/on_dedicated_thread.hpp>

When defining/initializing the loggers

Attention:: If you want to construct the logger, or to initialize it, the logger needs to be defined. In other words, the corresponding logger class needs to be defined.

when using the Named Writer (an easy interface to Formatters and Destinations)

#include <boost/logging/format/named_write.hpp>

when using Formatters and Destinations

#include <boost/logging/format.hpp>

when using tags

#include <boost/logging/formatter/tags.hpp>

when using Logging, without Formatters/Destinations

#include <boost/logging/logging.hpp>

An Example - the starter project

Note that usually you'll have a header file of your own, where you declare the logs. And a source file where you define and initialize your logs. You can take a look at the starter project.