source: NonGTP/Boost/boost/mpl/aux_/at_impl.hpp @ 857

Revision 857, 1.2 KB checked in by igarcia, 19 years ago (diff)
Line 
1
2#ifndef BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
3#define BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
4
5// Copyright Aleksey Gurtovoy 2000-2004
6//
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)
10//
11// See http://www.boost.org/libs/mpl for documentation.
12
13// $Source: /cvsroot/boost/boost/boost/mpl/aux_/at_impl.hpp,v $
14// $Date: 2004/09/02 15:40:43 $
15// $Revision: 1.5 $
16
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>
21
22namespace boost { namespace mpl {
23
24// default implementation; conrete sequences might override it by
25// specializing either the 'at_impl' or the primary 'at' template
26
27template< typename Tag >
28struct at_impl
29{
30    template< typename Sequence, typename N > struct apply
31    {
32        typedef typename advance<
33              typename begin<Sequence>::type
34            , N
35            >::type iter_;
36
37        typedef typename deref<iter_>::type type;
38    };
39};
40
41BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, at_impl)
42
43}}
44
45#endif // BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
Note: See TracBrowser for help on using the repository browser.