2 #ifndef BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
3 #define BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
5 // Copyright Aleksey Gurtovoy 2000-2004
7 // Distributed under the Boost Software License, Version 1.0.
8 // (See accompanying file LICENSE_1_0.txt or copy at
9 // http://www.boost.org/LICENSE_1_0.txt)
11 // See http://www.boost.org/libs/mpl for documentation.
13 // $Id: at_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
17 #include <boost/mpl/begin_end.hpp>
18 #include <boost/mpl/advance.hpp>
19 #include <boost/mpl/deref.hpp>
20 #include <boost/mpl/aux_/traits_lambda_spec.hpp>
22 namespace boost { namespace mpl {
24 // default implementation; conrete sequences might override it by
25 // specializing either the 'at_impl' or the primary 'at' template
27 template< typename Tag >
30 template< typename Sequence, typename N > struct apply
32 typedef typename advance<
33 typename begin<Sequence>::type
37 typedef typename deref<iter_>::type type;
41 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, at_impl)
45 #endif // BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED