ceph/src/boost/libs/log/example/doc/tutorial_fmt_stream_manual.cpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2015.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7
   8 #include <fstream>
   9 #include <iomanip>
  10 #include <boost/smart_ptr/shared_ptr.hpp>
  11 #include <boost/smart_ptr/make_shared_object.hpp>
  12 #include <boost/log/core.hpp>
  13 #include <boost/log/trivial.hpp>
  14 #include <boost/log/expressions.hpp>
  15 #include <boost/log/sinks/sync_frontend.hpp>
  16 #include <boost/log/sinks/text_ostream_backend.hpp>
  17 #include <boost/log/sources/severity_logger.hpp>
  18 #include <boost/log/sources/record_ostream.hpp>
  19 #include <boost/log/utility/setup/common_attributes.hpp>
  20
  21 namespace logging = boost::log;
  22 namespace src = boost::log::sources;
  23 namespace expr = boost::log::expressions;
  24 namespace sinks = boost::log::sinks;
  25 namespace keywords = boost::log::keywords;
  26
  27 //[ example_tutorial_formatters_stream_manual
  28 void init()
  29 {
  30     typedef sinks::synchronous_sink< sinks::text_ostream_backend > text_sink;
  31     boost::shared_ptr< text_sink > sink = boost::make_shared< text_sink >();
  32
  33     sink->locked_backend()->add_stream(
  34         boost::make_shared< std::ofstream >("sample.log"));
  35
  36     sink->set_formatter
  37     (
  38         expr::stream
  39                // line id will be written in hex, 8-digits, zero-filled
  40             << std::hex << std::setw(8) << std::setfill('0') << expr::attr< unsigned int >("LineID")
  41             << ": <" << logging::trivial::severity
  42             << "> " << expr::smessage
  43     );
  44
  45     logging::core::get()->add_sink(sink);
  46 }
  47 //]
  48
  49 int main(int, char*[])
  50 {
  51     init();
  52     logging::add_common_attributes();
  53
  54     using namespace logging::trivial;
  55     src::severity_logger< severity_level > lg;
  56
  57     BOOST_LOG_SEV(lg, trace) << "A trace severity message";
  58     BOOST_LOG_SEV(lg, debug) << "A debug severity message";
  59     BOOST_LOG_SEV(lg, info) << "An informational severity message";
  60     BOOST_LOG_SEV(lg, warning) << "A warning severity message";
  61     BOOST_LOG_SEV(lg, error) << "An error severity message";
  62     BOOST_LOG_SEV(lg, fatal) << "A fatal severity message";
  63
  64     return 0;
  65 }