| /*============================================================================= |
| Copyright (c) 2001-2010 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/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; |
| }; |
| }}} |
| |
| #endif |