libs/log/example/doc/tutorial_file_manual.cpp

/*
 *          Copyright Andrey Semashev 2007 - 2015.
 * Distributed under the Boost Software License, Version 1.0.
 *    (See accompanying file LICENSE_1_0.txt or copy at
 *          http://www.boost.org/LICENSE_1_0.txt)
 */
#include <fstream>
#include <boost/smart_ptr/shared_ptr.hpp>
#include <boost/smart_ptr/make_shared_object.hpp>
#include <boost/log/core.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/sinks/sync_frontend.hpp>
#include <boost/log/sinks/text_ostream_backend.hpp>
#include <boost/log/sources/logger.hpp>
#include <boost/log/sources/record_ostream.hpp>
namespace logging = boost::log;
namespace src = boost::log::sources;
namespace sinks = boost::log::sinks;
//[ example_tutorial_file_manual
void init()
{
    // Construct the sink
    typedef sinks::synchronous_sink< sinks::text_ostream_backend > text_sink;
    boost::shared_ptr< text_sink > sink = boost::make_shared< text_sink >();
    // Add a stream to write log to
    sink->locked_backend()->add_stream(
        boost::make_shared< std::ofstream >("sample.log"));
    // Register the sink in the logging core
    logging::core::get()->add_sink(sink);
}
//]
int main(int, char*[])
{
    init();
    src::logger lg;
    BOOST_LOG(lg) << "Hello world!";
    return 0;
}