ceph/src/boost/libs/log/example/doc/tutorial_fmt_stream.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 <boost/date_time/posix_time/posix_time_types.hpp>
   9 #include <boost/log/trivial.hpp>
  10 #include <boost/log/expressions.hpp>
  11 #include <boost/log/sources/severity_logger.hpp>
  12 #include <boost/log/sources/record_ostream.hpp>
  13 #include <boost/log/utility/setup/file.hpp>
  14 #include <boost/log/utility/setup/common_attributes.hpp>
  15 #include <boost/log/support/date_time.hpp>
  16
  17 namespace logging = boost::log;
  18 namespace src = boost::log::sources;
  19 namespace expr = boost::log::expressions;
  20 namespace keywords = boost::log::keywords;
  21
  22 #if 1
  23
  24 //[ example_tutorial_formatters_stream
  25 void init()
  26 {
  27     logging::add_file_log
  28     (
  29         keywords::file_name = "sample_%N.log",
  30         // This makes the sink to write log records that look like this:
  31         // 1: <normal> A normal severity message
  32         // 2: <error> An error severity message
  33         keywords::format =
  34         (
  35             expr::stream
  36                 << expr::attr< unsigned int >("LineID")
  37                 << ": <" << logging::trivial::severity
  38                 << "> " << expr::smessage
  39         )
  40     );
  41 }
  42 //]
  43
  44 #else
  45
  46 //[ example_tutorial_formatters_stream_date_time
  47 void init()
  48 {
  49     logging::add_file_log
  50     (
  51         keywords::file_name = "sample_%N.log",
  52         // This makes the sink to write log records that look like this:
  53         // YYYY-MM-DD HH:MI:SS: <normal> A normal severity message
  54         // YYYY-MM-DD HH:MI:SS: <error> An error severity message
  55         keywords::format =
  56         (
  57             expr::stream
  58                 << expr::format_date_time< boost::posix_time::ptime >("TimeStamp", "%Y-%m-%d %H:%M:%S")
  59                 << ": <" << logging::trivial::severity
  60                 << "> " << expr::smessage
  61         )
  62     );
  63 }
  64 //]
  65
  66 #endif
  67
  68 int main(int, char*[])
  69 {
  70     init();
  71     logging::add_common_attributes();
  72
  73     using namespace logging::trivial;
  74     src::severity_logger< severity_level > lg;
  75
  76     BOOST_LOG_SEV(lg, trace) << "A trace severity message";
  77     BOOST_LOG_SEV(lg, debug) << "A debug severity message";
  78     BOOST_LOG_SEV(lg, info) << "An informational severity message";
  79     BOOST_LOG_SEV(lg, warning) << "A warning severity message";
  80     BOOST_LOG_SEV(lg, error) << "An error severity message";
  81     BOOST_LOG_SEV(lg, fatal) << "A fatal severity message";
  82
  83     return 0;
  84 }