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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 | ||
24 | namespace boost { namespace mpl { | |
25 | ||
26 | #if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES) | |
27 | ||
28 | template<> | |
29 | struct 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 | ||
41 | template< BOOST_MPL_AUX_NTTP_DECL(long, n_) > | |
42 | struct 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 |