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/Src/Dependencies/Boost/boost/spirit/home/karma/reference.hpp

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 1//  Copyright (c) 2001-2011 Joel de Guzman
 2//  Copyright (c) 2001-2011 Hartmut Kaiser
 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_KARMA_REFERENCE_APR_17_2009_1057PM)
 8#define BOOST_SPIRIT_KARMA_REFERENCE_APR_17_2009_1057PM
 9
10#if defined(_MSC_VER)
11#pragma once
12#endif
13
14#include <boost/spirit/home/karma/meta_compiler.hpp>
15#include <boost/spirit/home/karma/generator.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
21namespace boost { namespace spirit { namespace karma
22{
23    ///////////////////////////////////////////////////////////////////////////
24    // reference is a generator that references another generator (its Subject)
25    ///////////////////////////////////////////////////////////////////////////
26    template <typename Subject>
27    struct reference : generator<reference<Subject> >
28    {
29        typedef mpl::int_<generator_properties::all_properties> properties;
30
31        typedef Subject subject_type;
32
33        reference(Subject& subject)
34          : ref(subject) {}
35
36        template <typename Context, typename Unused>
37        struct attribute : Subject::template attribute<Context, Unused> {};
38
39        // Default overload, used whenever the attribute is not unused and not
40        // used from an aliased rule.
41        template <typename OutputIterator, typename Context
42          , typename Delimiter, typename Attribute>
43        bool generate(OutputIterator& sink, Context& context
44          , Delimiter const& delim, Attribute const& attr) const
45        {
46            return ref.get().generate(sink, context, delim, attr);
47        }
48
49        // This overload gets called from an aliased rule only, we take the 
50        // attribute from the context provided from the wrapper rule.
51        template <typename OutputIterator, typename Context
52          , typename Delimiter>
53        bool generate(OutputIterator& sink, Context& context
54          , Delimiter const& delim, unused_type) const
55        {
56            return ref.get().generate(sink, context, delim, context.attributes);
57        }
58
59        // This overload is used whenever no attribute is given and it is used
60        // not from an aliased rule.
61        template <typename OutputIterator, typename Delimiter>
62        bool generate(OutputIterator& sink, unused_type
63          , Delimiter const& delim, unused_type) const
64        {
65            return ref.get().generate(sink, unused, delim, unused);
66        }
67
68        template <typename Context>
69        info what(Context& context) const
70        {
71            // the reference is transparent (does not add any info)
72            return ref.get().what(context);
73        }
74
75        boost::reference_wrapper<Subject> ref;
76    };
77}}}
78
79namespace boost { namespace spirit { namespace traits
80{
81    ///////////////////////////////////////////////////////////////////////////
82    template <typename Subject, typename Attribute, typename Context
83      , typename Iterator>
84    struct handles_container<karma::reference<Subject>, Attribute
85      , Context, Iterator>
86      : handles_container<typename remove_const<Subject>::type, Attribute
87        , Context, Iterator> 
88    {};
89}}}
90
91#endif