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