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_ 47