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69 lines
2.4 KiB
69 lines
2.4 KiB
/*============================================================================= |
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Copyright (c) 2001-2011 Joel de Guzman |
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Distributed under the Boost Software License, Version 1.0. (See accompanying |
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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==============================================================================*/ |
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#if !defined(BOOST_SPIRIT_REFERENCE_OCTOBER_31_2008_1218AM) |
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#define BOOST_SPIRIT_REFERENCE_OCTOBER_31_2008_1218AM |
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#if defined(_MSC_VER) |
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#pragma once |
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#endif |
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#include <boost/spirit/home/qi/meta_compiler.hpp> |
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#include <boost/spirit/home/qi/parser.hpp> |
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#include <boost/spirit/home/support/info.hpp> |
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#include <boost/spirit/home/support/handles_container.hpp> |
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#include <boost/type_traits/remove_const.hpp> |
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#include <boost/ref.hpp> |
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namespace boost { namespace spirit { namespace qi |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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// reference is a parser that references another parser (its Subject) |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject> |
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struct reference : parser<reference<Subject> > |
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{ |
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typedef Subject subject_type; |
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reference(Subject& subject) |
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: ref(subject) {} |
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template <typename Context, typename Iterator> |
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struct attribute : Subject::template attribute<Context, Iterator> {}; |
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template <typename Iterator, typename Context |
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, typename Skipper, typename Attribute> |
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bool parse(Iterator& first, Iterator const& last |
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, Context& context, Skipper const& skipper |
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, Attribute& attr) const |
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{ |
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return ref.get().parse(first, last, context, skipper, attr); |
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} |
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template <typename Context> |
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info what(Context& context) const |
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{ |
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// the reference is transparent (does not add any info) |
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return ref.get().what(context); |
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} |
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boost::reference_wrapper<Subject> ref; |
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}; |
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}}} |
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namespace boost { namespace spirit { namespace traits |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject, typename Attribute, typename Context |
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, typename Iterator> |
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struct handles_container<qi::reference<Subject>, Attribute, Context |
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, Iterator> |
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: handles_container<typename remove_const<Subject>::type |
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, Attribute, Context, Iterator> |
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{}; |
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}}} |
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#endif
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