1
2#ifndef BOOST_MPL_VECTOR_AUX_FRONT_HPP_INCLUDED
3#define BOOST_MPL_VECTOR_AUX_FRONT_HPP_INCLUDED
4
5// Copyright Aleksey Gurtovoy 2000-2008
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/front_fwd.hpp>
18#include <boost/mpl/vector/aux_/at.hpp>
19#include <boost/mpl/vector/aux_/tag.hpp>
20#include <boost/mpl/aux_/nttp_decl.hpp>
21#include <boost/mpl/aux_/config/typeof.hpp>
22#include <boost/mpl/aux_/config/ctps.hpp>
23
24namespace boost { namespace mpl {
25
26#if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
27
28template<>
29struct front_impl< aux::vector_tag >
30{
31 template< typename Vector > struct apply
32 : v_at<Vector,0>
33 {
34 };
35};
36
37#else
38
39#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
40
41template< BOOST_MPL_AUX_NTTP_DECL(long, n_) >
42struct front_impl< aux::vector_tag<n_> >
43{
44 template< typename Vector > struct apply
45 {
46 typedef typename Vector::item0 type;
47 };
48};
49
50#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
51
52#endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES
53
54}}
55
56#endif // BOOST_MPL_VECTOR_AUX_FRONT_HPP_INCLUDED
57