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- /*=============================================================================
- 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
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