boost/log/detail/native_typeof.hpp

/*
 *          Copyright Andrey Semashev 2007 - 2015.
 * Distributed under the Boost Software License, Version 1.0.
 *    (See accompanying file LICENSE_1_0.txt or copy at
 *          http://www.boost.org/LICENSE_1_0.txt)
 */
/*!
 * \file   native_typeof.hpp
 * \author Andrey Semashev
 * \date   08.03.2009
 *
 * This header is the Boost.Log library implementation, see the library documentation
 * at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
 */
#ifndef BOOST_LOG_DETAIL_NATIVE_TYPEOF_HPP_INCLUDED_
#define BOOST_LOG_DETAIL_NATIVE_TYPEOF_HPP_INCLUDED_
#include <boost/log/detail/config.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
#if !defined(BOOST_NO_CXX11_DECLTYPE)
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
namespace aux {
template< typename T >
T get_root_type(T const&);
} // namespace aux
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#define BOOST_LOG_TYPEOF(x) decltype(::boost::log::aux::get_root_type(x))
#elif defined(__COMO__) && defined(__GNUG__)
#define BOOST_LOG_TYPEOF(x) typeof(x)
#elif defined(__GNUC__) || defined(__MWERKS__)
#define BOOST_LOG_TYPEOF(x) __typeof__(x)
#endif
#if !defined(BOOST_NO_CXX11_AUTO_DECLARATIONS)
#define BOOST_LOG_AUTO(var, expr) auto var = (expr)
#endif
#if !defined(BOOST_LOG_AUTO) && defined(BOOST_LOG_TYPEOF)
#define BOOST_LOG_AUTO(var, expr) BOOST_LOG_TYPEOF((expr)) var = (expr)
#endif
#endif // BOOST_LOG_DETAIL_NATIVE_TYPEOF_HPP_INCLUDED_