aux_/pack/parameter_requirements.hpp

0001 // Copyright Daniel Wallin, David Abrahams 2005.
0002 // Distributed under the Boost Software License, Version 1.0.
0003 // (See accompanying file LICENSE_1_0.txt or copy at
0004 // http://www.boost.org/LICENSE_1_0.txt)
0005
0006 #ifndef BOOST_PARAMETER_AUX_PACK_PARAMETER_REQUIREMENTS_HPP
0007 #define BOOST_PARAMETER_AUX_PACK_PARAMETER_REQUIREMENTS_HPP
0008
0009 namespace boost { namespace parameter { namespace aux {
0010
0011     // Used to pass static information about parameter requirements through
0012     // the satisfies() overload set (below).  The matched function is never
0013     // invoked, but its type indicates whether a parameter matches at
0014     // compile-time.
0015     template <typename Keyword, typename Predicate, typename HasDefault>
0016     struct parameter_requirements
0017     {
0018         typedef Keyword keyword;
0019         typedef Predicate predicate;
0020         typedef HasDefault has_default;
0021     };
0022 }}} // namespace boost::parameter::aux
0023
0024 #endif  // include guard
0025