log/detail/native_typeof.hpp

0001 /*
0002  *          Copyright Andrey Semashev 2007 - 2015.
0003  * Distributed under the Boost Software License, Version 1.0.
0004  *    (See accompanying file LICENSE_1_0.txt or copy at
0005  *          http://www.boost.org/LICENSE_1_0.txt)
0006  */
0007 /*!
0008  * \file   native_typeof.hpp
0009  * \author Andrey Semashev
0010  * \date   08.03.2009
0011  *
0012  * This header is the Boost.Log library implementation, see the library documentation
0013  * at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
0014  */
0015
0016 #ifndef BOOST_LOG_DETAIL_NATIVE_TYPEOF_HPP_INCLUDED_
0017 #define BOOST_LOG_DETAIL_NATIVE_TYPEOF_HPP_INCLUDED_
0018
0019 #include <boost/log/detail/config.hpp>
0020
0021 #ifdef BOOST_HAS_PRAGMA_ONCE
0022 #pragma once
0023 #endif
0024
0025 #if !defined(BOOST_NO_CXX11_DECLTYPE)
0026
0027 namespace boost {
0028
0029 BOOST_LOG_OPEN_NAMESPACE
0030
0031 namespace aux {
0032
0033 template< typename T >
0034 T get_root_type(T const&);
0035
0036 } // namespace aux
0037
0038 BOOST_LOG_CLOSE_NAMESPACE // namespace log
0039
0040 } // namespace boost
0041
0042 #define BOOST_LOG_TYPEOF(x) decltype(::boost::log::aux::get_root_type(x))
0043
0044 #elif defined(__COMO__) && defined(__GNUG__)
0045
0046 #define BOOST_LOG_TYPEOF(x) typeof(x)
0047
0048 #elif defined(__GNUC__) || defined(__MWERKS__)
0049
0050 #define BOOST_LOG_TYPEOF(x) __typeof__(x)
0051
0052 #endif
0053
0054
0055 #if !defined(BOOST_NO_CXX11_AUTO_DECLARATIONS)
0056 #define BOOST_LOG_AUTO(var, expr) auto var = (expr)
0057 #endif
0058
0059 #if !defined(BOOST_LOG_AUTO) && defined(BOOST_LOG_TYPEOF)
0060 #define BOOST_LOG_AUTO(var, expr) BOOST_LOG_TYPEOF((expr)) var = (expr)
0061 #endif
0062
0063 #endif // BOOST_LOG_DETAIL_NATIVE_TYPEOF_HPP_INCLUDED_