/*============================================================================= Copyright (c) 2009 Christopher Schmidt Distributed under 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 BOOST_FUSION_EXAMPLE_EXTENSION_DETAIL_KEY_OF_IMPL_HPP #define BOOST_FUSION_EXAMPLE_EXTENSION_DETAIL_KEY_OF_IMPL_HPP #include <boost/mpl/if.hpp> namespace fields { struct name; struct age; } namespace example { struct example_struct_iterator_tag; } namespace boost { namespace fusion { namespace extension { template<typename Tag> struct key_of_impl; template<> struct key_of_impl<example::example_struct_iterator_tag> { template<typename It> struct apply : mpl::if_c<!It::index::value, fields::name, fields::age> {}; }; } }} #endif