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- /*=============================================================================
- Copyright (c) 2001-2011 Joel de Guzman
- Copyright (c) 2005-2006 Dan Marsden
- 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)
- ==============================================================================*/
- #if !defined(BOOST_FUSION_AT_KEY_IMPL_20060223_2017)
- #define BOOST_FUSION_AT_KEY_IMPL_20060223_2017
- #include <string>
- #include <boost/mpl/if.hpp>
- #include <boost/type_traits/is_const.hpp>
- namespace fields
- {
- struct name;
- struct age;
- }
- namespace example
- {
- struct example_sequence_tag;
- }
- namespace boost { namespace fusion {
- namespace extension
- {
- template<typename Tag>
- struct at_key_impl;
- template<>
- struct at_key_impl<example::example_sequence_tag>
- {
- template<typename Sequence, typename Key>
- struct apply;
- template<typename Sequence>
- struct apply<Sequence, fields::name>
- {
- typedef typename mpl::if_<
- is_const<Sequence>,
- std::string const&,
- std::string&>::type type;
- static type
- call(Sequence& seq)
- {
- return seq.name;
- };
- };
- template<typename Sequence>
- struct apply<Sequence, fields::age>
- {
- typedef typename mpl::if_<
- is_const<Sequence>,
- int const&,
- int&>::type type;
- static type
- call(Sequence& seq)
- {
- return seq.age;
- };
- };
- };
- }
- }}
- #endif
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