| // 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 |
| |