59 lines
2.1 KiB
C++
Executable File
59 lines
2.1 KiB
C++
Executable File
/*=============================================================================
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Copyright (c) 2001-2007 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_META_GRAMMAR_FEB_07_2007_1100AM)
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#define BOOST_SPIRIT_META_GRAMMAR_FEB_07_2007_1100AM
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#include <boost/spirit/home/qi/domain.hpp>
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#include <boost/spirit/home/support/meta_grammar.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost { namespace spirit { namespace qi
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{
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///////////////////////////////////////////////////////////////////////////
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// forwards
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///////////////////////////////////////////////////////////////////////////
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struct action;
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struct main_meta_grammar;
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template <typename Expr, typename Enable>
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struct is_valid_expr;
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template <typename Expr, typename Enable>
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struct expr_transform;
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///////////////////////////////////////////////////////////////////////////
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// action meta-grammar
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///////////////////////////////////////////////////////////////////////////
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struct action_meta_grammar :
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meta_grammar::binary_rule<
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qi::domain, proto::tag::subscript, action
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, main_meta_grammar, proto::when<proto::_, proto::_arg>
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>
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{
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};
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///////////////////////////////////////////////////////////////////////////
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// These specializations non-intrusively hooks into the RD meta-grammar.
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// (see qi/meta_grammar.hpp)
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///////////////////////////////////////////////////////////////////////////
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template <typename Expr>
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struct is_valid_expr<Expr
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, typename enable_if<proto::matches<Expr, action_meta_grammar> >::type>
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: mpl::true_
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{
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};
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template <typename Expr>
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struct expr_transform<Expr
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, typename enable_if<proto::matches<Expr, action_meta_grammar> >::type>
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: mpl::identity<action_meta_grammar>
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{
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};
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}}}
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#endif
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