boost/vmd/empty.hpp

0001
0002 //  (C) Copyright Edward Diener 2011-2015
0003 //  Use, modification and distribution are subject to the Boost Software License,
0004 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0005 //  http://www.boost.org/LICENSE_1_0.txt).
0006
0007 #if !defined(BOOST_VMD_EMPTY_HPP)
0008 #define BOOST_VMD_EMPTY_HPP
0009
0010 #include <boost/vmd/detail/setup.hpp>
0011
0012 #if BOOST_PP_VARIADICS
0013
0014 /*
0015
0016   The succeeding comments in this file are in doxygen format.
0017
0018 */
0019
0020 /** \file
0021 */
0022
0023 /** \def BOOST_VMD_EMPTY(...)
0024
0025     \brief Outputs emptiness.
0026
0027     ... = any variadic parameters. The parameters are ignored.
0028
0029     This macro is used to output emptiness ( nothing ) no matter
0030     what is passed to it.
0031
0032     If you use this macro to return a result, as in 'result BOOST_VMD_EMPTY'
0033     subsequently invoked, you should surround the result with
0034     BOOST_VMD_IDENTITY_RESULT to smooth over a VC++ problem.
0035
0036 */
0037
0038 #define BOOST_VMD_EMPTY(...)
0039
0040 #endif /* BOOST_PP_VARIADICS */
0041 #endif /* BOOST_VMD_EMPTY_HPP */