1 // Copyright Daniel Wallin, David Abrahams 2005. Use, modification and

     2 // distribution is subject to the Boost Software License, Version 1.0. (See

     3 // accompanying file LICENSE_1_0.txt or copy at

     4 // http://www.boost.org/LICENSE_1_0.txt)

     5 

     6 #ifndef BOOST_PARAMETER_VOID_050329_HPP

     7 #define BOOST_PARAMETER_VOID_050329_HPP

     8 

     9 namespace boost { namespace parameter { 

    10 

    11 // A placemarker for "no argument passed."

    12 // MAINTAINER NOTE: Do not make this into a metafunction

    13 struct void_ {}; 

    14 

    15 namespace aux 

    16 {

    17 

    18   inline void_& void_reference()

    19   {

    20       static void_ instance;

    21       return instance;

    22   }

    23 

    24 } // namespace aux

    25 

    26 }} // namespace boost::parameter

    27 

    28 #endif // BOOST_PARAMETER_VOID_050329_HPP

    29