1
2#ifndef BOOST_MPL_AT_HPP_INCLUDED
3#define BOOST_MPL_AT_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// $Id$
14// $Date$
15// $Revision$
16
17#include <boost/mpl/at_fwd.hpp>
18#include <boost/mpl/aux_/at_impl.hpp>
19#include <boost/mpl/long.hpp>
20#include <boost/mpl/sequence_tag.hpp>
21#include <boost/mpl/aux_/na_spec.hpp>
22#include <boost/mpl/aux_/lambda_support.hpp>
23#include <boost/mpl/aux_/nttp_decl.hpp>
24
25namespace boost { namespace mpl {
26
27template<
28 typename BOOST_MPL_AUX_NA_PARAM(Sequence)
29 , typename BOOST_MPL_AUX_NA_PARAM(N)
30 >
31struct at
32 : at_impl< typename sequence_tag<Sequence>::type >
33 ::template apply< Sequence,N >
34{
35 BOOST_MPL_AUX_LAMBDA_SUPPORT(2,at,(Sequence,N))
36};
37
38template<
39 typename Sequence
40 , BOOST_MPL_AUX_NTTP_DECL(long, N)
41 >
42struct at_c
43 : at_impl< typename sequence_tag<Sequence>::type >
44 ::template apply< Sequence,mpl::long_<N> >
45{
46};
47
48BOOST_MPL_AUX_NA_SPEC(2, at)
49
50}}
51
52#endif // BOOST_MPL_AT_HPP_INCLUDED
53