/*============================================================================= Copyright (c) 2001-2006 Joel de Guzman Copyright (c) 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_DEREF_IMPL_20060222_1952) #define BOOST_FUSION_DEREF_IMPL_20060222_1952 #include <boost/static_assert.hpp> #include <boost/type_traits/is_const.hpp> #include <boost/mpl/if.hpp> #include <string> namespace example { struct example_struct_iterator_tag; template<typename Struct, int Pos> struct example_struct_iterator; } namespace boost { namespace fusion { namespace extension { template<typename Tag> struct deref_impl; template<> struct deref_impl<example::example_struct_iterator_tag> { template<typename Iterator> struct apply; template<typename Struct> struct apply<example::example_struct_iterator<Struct, 0> > { typedef typename mpl::if_< is_const<Struct>, std::string const&, std::string&>::type type; static type call(example::example_struct_iterator<Struct, 0> const& it) { return it.struct_.name; } }; template<typename Struct> struct apply<example::example_struct_iterator<Struct, 1> > { typedef typename mpl::if_< is_const<Struct>, int const&, int&>::type type; static type call(example::example_struct_iterator<Struct, 1> const& it) { return it.struct_.age; } }; }; } }} #endif