1 /*
2  *          Copyright Andrey Semashev 2007 - 2015.
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   native_typeof.hpp
9  * \author Andrey Semashev
10  * \date   08.03.2009
11  *
12  * This header is the Boost.Log library implementation, see the library documentation
13  * at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
14  */
15 
16 #ifndef BOOST_LOG_DETAIL_NATIVE_TYPEOF_HPP_INCLUDED_
17 #define BOOST_LOG_DETAIL_NATIVE_TYPEOF_HPP_INCLUDED_
18 
19 #include <boost/log/detail/config.hpp>
20 
21 #ifdef BOOST_HAS_PRAGMA_ONCE
22 #pragma once
23 #endif
24 
25 #if !defined(BOOST_NO_CXX11_DECLTYPE)
26 
27 namespace boost {
28 
29 BOOST_LOG_OPEN_NAMESPACE
30 
31 namespace aux {
32 
33 template< typename T >
34 T get_root_type(T const&);
35 
36 } // namespace aux
37 
38 BOOST_LOG_CLOSE_NAMESPACE // namespace log
39 
40 } // namespace boost
41 
42 #define BOOST_LOG_TYPEOF(x) decltype(::boost::log::aux::get_root_type(x))
43 
44 #elif defined(__COMO__) && defined(__GNUG__)
45 
46 #define BOOST_LOG_TYPEOF(x) typeof(x)
47 
48 #elif defined(__GNUC__) || defined(__MWERKS__)
49 
50 #define BOOST_LOG_TYPEOF(x) __typeof__(x)
51 
52 #endif
53 
54 
55 #if !defined(BOOST_NO_CXX11_AUTO_DECLARATIONS)
56 #define BOOST_LOG_AUTO(var, expr) auto var = (expr)
57 #endif
58 
59 #if !defined(BOOST_LOG_AUTO) && defined(BOOST_LOG_TYPEOF)
60 #define BOOST_LOG_AUTO(var, expr) BOOST_LOG_TYPEOF((expr)) var = (expr)
61 #endif
62 
63 #endif // BOOST_LOG_DETAIL_NATIVE_TYPEOF_HPP_INCLUDED_
64