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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 | ==============================================================================*/ | |
7 | #if !defined(BOOST_SPIRIT_REFERENCE_OCTOBER_31_2008_1218AM) | |
8 | #define BOOST_SPIRIT_REFERENCE_OCTOBER_31_2008_1218AM | |
9 | ||
10 | #if defined(_MSC_VER) | |
11 | #pragma once | |
12 | #endif | |
13 | ||
14 | #include <boost/spirit/home/qi/meta_compiler.hpp> | |
15 | #include <boost/spirit/home/qi/parser.hpp> | |
16 | #include <boost/spirit/home/support/info.hpp> | |
17 | #include <boost/spirit/home/support/handles_container.hpp> | |
18 | #include <boost/type_traits/remove_const.hpp> | |
19 | #include <boost/ref.hpp> | |
20 | ||
21 | namespace boost { namespace spirit { namespace qi | |
22 | { | |
23 | /////////////////////////////////////////////////////////////////////////// | |
24 | // reference is a parser that references another parser (its Subject) | |
25 | /////////////////////////////////////////////////////////////////////////// | |
26 | template <typename Subject> | |
27 | struct reference : parser<reference<Subject> > | |
28 | { | |
29 | typedef Subject subject_type; | |
30 | ||
31 | reference(Subject& subject) | |
32 | : ref(subject) {} | |
33 | ||
34 | template <typename Context, typename Iterator> | |
35 | struct attribute : Subject::template attribute<Context, Iterator> {}; | |
36 | ||
37 | template <typename Iterator, typename Context | |
38 | , typename Skipper, typename Attribute> | |
39 | bool parse(Iterator& first, Iterator const& last | |
40 | , Context& context, Skipper const& skipper | |
41 | , Attribute& attr_) const | |
42 | { | |
43 | return ref.get().parse(first, last, context, skipper, attr_); | |
44 | } | |
45 | ||
46 | template <typename Context> | |
47 | info what(Context& context) const | |
48 | { | |
49 | // the reference is transparent (does not add any info) | |
50 | return ref.get().what(context); | |
51 | } | |
52 | ||
53 | boost::reference_wrapper<Subject> ref; | |
54 | }; | |
55 | }}} | |
56 | ||
57 | namespace boost { namespace spirit { namespace traits | |
58 | { | |
59 | /////////////////////////////////////////////////////////////////////////// | |
60 | template <typename Subject, typename Attribute, typename Context | |
61 | , typename Iterator> | |
62 | struct handles_container<qi::reference<Subject>, Attribute, Context | |
63 | , Iterator> | |
64 | : handles_container<typename remove_const<Subject>::type | |
65 | , Attribute, Context, Iterator> | |
66 | {}; | |
67 | }}} | |
68 | ||
69 | #endif |