ceph/src/boost/boost/log/utility/open_mode.hpp

   1 /*
   2  *              Copyright Andrey Semashev 2016.
   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  * \file   open_mode.hpp
   9  * \author Andrey Semashev
  10  * \date   01.01.2016
  11  *
  12  * The header defines resource opening modes.
  13  */
  14
  15 #ifndef BOOST_LOG_UTILITY_OPEN_MODE_HPP_INCLUDED_
  16 #define BOOST_LOG_UTILITY_OPEN_MODE_HPP_INCLUDED_
  17
  18 #include <boost/log/detail/config.hpp>
  19 #include <boost/log/detail/header.hpp>
  20
  21 #ifdef BOOST_HAS_PRAGMA_ONCE
  22 #pragma once
  23 #endif
  24
  25 namespace boost {
  26
  27 BOOST_LOG_OPEN_NAMESPACE
  28
  29 namespace open_mode {
  30
  31 //! Create a new resource; fail if exists already
  32 struct create_only_tag {} const create_only = create_only_tag();
  33 //! Opens an existing resource; fail if not exist
  34 struct open_only_tag {} const open_only = open_only_tag();
  35 //! Creates a new resource or opens an existing one
  36 struct open_or_create_tag {} const open_or_create = open_or_create_tag();
  37
  38 } // namespace open_mode
  39
  40 BOOST_LOG_CLOSE_NAMESPACE // namespace log
  41
  42 } // namespace boost
  43
  44 #include <boost/log/detail/footer.hpp>
  45
  46 #endif // BOOST_LOG_UTILITY_OPEN_MODE_HPP_INCLUDED_