Line data    Source code

       1             : // Copyright (c) 2013-2021  Made to Order Software Corp.  All Rights Reserved
       2             : //
       3             : // https://snapwebsites.org/project/cppthread
       4             : // contact@m2osw.com
       5             : //
       6             : // This program is free software; you can redistribute it and/or modify
       7             : // it under the terms of the GNU General Public License as published by
       8             : // the Free Software Foundation; either version 2 of the License, or
       9             : // (at your option) any later version.
      10             : //
      11             : // This program is distributed in the hope that it will be useful,
      12             : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14             : // GNU General Public License for more details.
      15             : //
      16             : // You should have received a copy of the GNU General Public License along
      17             : // with this program; if not, write to the Free Software Foundation, Inc.,
      18             : // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
      19             : #pragma once
      20             : 
      21             : /** \file
      22             :  * \brief Declaration of the log class used to send error messages.
      23             :  *
      24             :  * The library offers a log facility for when messages are generated on
      25             :  * errors and various output (i.e. --help).
      26             :  */
      27             : 
      28             : // C++ lib
      29             : //
      30             : #include    <iostream>
      31             : #include    <sstream>
      32             : 
      33             : 
      34             : namespace cppthread
      35             : {
      36             : 
      37             : 
      38             : enum class log_level_t
      39             : {
      40             :     debug,
      41             :     info,
      42             :     warning,
      43             :     error,
      44             :     fatal
      45             : };
      46             : 
      47             : std::string to_string(log_level_t level);
      48             : 
      49             : 
      50             : typedef void (*log_callback)(log_level_t level, std::string const & message);
      51             : 
      52             : void set_log_callback(log_callback callback);
      53             : 
      54             : 
      55           2 : class logger final
      56             : {
      57             : public:
      58             :                         logger();
      59             : 
      60             :     logger &            end();
      61             :     logger &            operator << (log_level_t const & level);
      62             :     logger &            operator << (logger & (*func)(logger &));
      63             : 
      64             :     template<typename T>
      65           0 :     logger & operator << (T const & v)
      66             :     {
      67           0 :         lock();
      68           0 :         f_log << v;
      69           0 :         return *this;
      70             :     }
      71             : 
      72             : private:
      73             :     static void         lock();
      74             :     static void         unlock();
      75             : 
      76             :     log_level_t         f_level = log_level_t::error;
      77             :     std::stringstream   f_log = std::stringstream();
      78             : };
      79             : 
      80             : 
      81           0 : inline logger & end(logger & l) { return l.end(); }
      82             : 
      83             : 
      84             : extern logger   log;
      85             : 
      86             : 
      87             : } // namespace cppthread
      88             : // vim: ts=4 sw=4 et