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