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- // 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
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