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