70 lines
2.5 KiB
C++
70 lines
2.5 KiB
C++
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/*=============================================================================
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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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