parameter/aux_/void.hpp

0001 // Copyright Daniel Wallin, David Abrahams 2005.
0002 // Distributed under the Boost Software License, Version 1.0.
0003 // (See accompanying file LICENSE_1_0.txt or copy at
0004 // http://www.boost.org/LICENSE_1_0.txt)
0005
0006 #ifndef BOOST_PARAMETER_VOID_050329_HPP
0007 #define BOOST_PARAMETER_VOID_050329_HPP
0008
0009 namespace boost { namespace parameter {
0010
0011     // A placemarker for "no argument passed."
0012     // MAINTAINER NOTE: Do not make this into a metafunction
0013     struct void_
0014     {
0015     };
0016 }} // namespace boost::parameter
0017
0018 namespace boost { namespace parameter { namespace aux {
0019
0020     inline ::boost::parameter::void_& void_reference()
0021     {
0022         static ::boost::parameter::void_ instance;
0023         return instance;
0024     }
0025 }}} // namespace boost::parameter::aux
0026
0027 #include <boost/config/workaround.hpp>
0028
0029 #if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x580))
0030
0031 namespace boost { namespace parameter { namespace aux {
0032
0033     typedef void* voidstar;
0034 }}} // namespace boost::parameter::aux
0035
0036 #endif
0037 #endif  // include guard
0038