/*============================================================================= Copyright (c) 2001-2006 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_IMPL_20060223_2017) #define BOOST_FUSION_AT_IMPL_20060223_2017 #include <string> #include <boost/mpl/if.hpp> #include <boost/mpl/int.hpp> #include <boost/type_traits/is_const.hpp> namespace example { struct example_sequence_tag; } namespace boost { namespace fusion { namespace extension { template<typename Tag> struct at_impl; template<> struct at_impl<example::example_sequence_tag> { template<typename Sequence, typename Key> struct apply; template<typename Sequence> struct apply<Sequence, mpl::int_<0> > { 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, mpl::int_<1> > { typedef typename mpl::if_< is_const<Sequence>, int const&, int&>::type type; static type call(Sequence& seq) { return seq.age; }; }; }; } }} #endif