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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
3 | ||
4 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | =============================================================================*/ | |
f67539c2 TL |
7 | #ifndef BOOST_SPIRIT_SUPPORT_SEQUENCE_BASE_ID_HPP |
8 | #define BOOST_SPIRIT_SUPPORT_SEQUENCE_BASE_ID_HPP | |
7c673cae FG |
9 | |
10 | #if defined(_MSC_VER) | |
11 | #pragma once | |
12 | #endif | |
13 | ||
14 | #include <boost/mpl/has_xxx.hpp> | |
15 | #include <boost/utility/enable_if.hpp> | |
16 | #include <boost/spirit/home/support/attributes.hpp> | |
17 | ||
18 | namespace boost { namespace spirit { namespace traits | |
19 | { | |
20 | namespace detail | |
21 | { | |
22 | BOOST_MPL_HAS_XXX_TRAIT_DEF(sequence_base_id) | |
23 | } | |
24 | ||
25 | // We specialize this for sequences (see support/attributes.hpp). | |
26 | // For sequences, we only wrap the attribute in a tuple IFF | |
27 | // it is not already a fusion tuple. | |
28 | // | |
29 | // Note: in the comment above, "sequence" is a spirit sequence | |
30 | // component (parser or generator), and a tuple is a fusion sequence | |
31 | // (to avoid terminology confusion). | |
32 | template <typename Derived, typename Attribute> | |
33 | struct pass_attribute<Derived, Attribute, | |
34 | typename enable_if<detail::has_sequence_base_id<Derived> >::type> | |
35 | : wrap_if_not_tuple<Attribute> {}; | |
36 | ||
37 | }}} | |
38 | ||
39 | #endif |