boost/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_