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1 | |
2 | #ifndef BOOST_MPL_AUX_EMPTY_IMPL_HPP_INCLUDED | |
3 | #define BOOST_MPL_AUX_EMPTY_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 | // $Id$ | |
14 | // $Date$ | |
15 | // $Revision$ | |
16 | ||
17 | #include <boost/mpl/empty_fwd.hpp> | |
18 | #include <boost/mpl/begin_end.hpp> | |
19 | #include <boost/mpl/aux_/traits_lambda_spec.hpp> | |
20 | #include <boost/type_traits/is_same.hpp> | |
21 | ||
22 | namespace boost { namespace mpl { | |
23 | ||
24 | // default implementation; conrete sequences might override it by | |
25 | // specializing either the 'empty_impl' or the primary 'empty' template | |
26 | ||
27 | template< typename Tag > | |
28 | struct empty_impl | |
29 | { | |
30 | template< typename Sequence > struct apply | |
31 | : is_same< | |
32 | typename begin<Sequence>::type | |
33 | , typename end<Sequence>::type | |
34 | > | |
35 | { | |
36 | }; | |
37 | }; | |
38 | ||
39 | BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1,empty_impl) | |
40 | ||
41 | }} | |
42 | ||
43 | #endif // BOOST_MPL_AUX_EMPTY_IMPL_HPP_INCLUDED |