Chris@16: // Copyright Daniel Wallin, David Abrahams 2005. Use, modification and
Chris@16: // distribution is subject to the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef YESNO_050328_HPP
Chris@16: #define YESNO_050328_HPP
Chris@16: 
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: 
Chris@16: namespace boost { namespace parameter { namespace aux {
Chris@16: 
Chris@16: // types used with the "sizeof trick" to capture the results of
Chris@16: // overload resolution at compile-time.
Chris@16: typedef char yes_tag;
Chris@16: typedef char (&no_tag)[2];
Chris@16: 
Chris@16: // mpl::true_ and mpl::false_ are not distinguishable by sizeof(),
Chris@16: // so we pass them through these functions to get a type that is.
Chris@16: yes_tag to_yesno(mpl::true_);
Chris@16: no_tag to_yesno(mpl::false_);
Chris@16: 
Chris@16: }}} // namespace boost::parameter::aux
Chris@16: 
Chris@16: #endif // YESNO_050328_HPP
Chris@16: