| /*============================================================================= |
| 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 |