62 lines
2.3 KiB
C++
Executable File
62 lines
2.3 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_12_2007_0534PM)
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#define BOOST_SPIRIT_META_GRAMMAR_FEB_12_2007_0534PM
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#include <boost/spirit/home/support/nonterminal/nonterminal.hpp>
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#include <boost/spirit/home/qi/domain.hpp>
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#include <boost/spirit/home/qi/nonterminal/rule.hpp>
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#include <boost/spirit/home/qi/nonterminal/grammar.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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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/identity.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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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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// nonterminal meta-grammar
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///////////////////////////////////////////////////////////////////////////
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struct nonterminal_meta_grammar
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: meta_grammar::terminal_rule<
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qi::domain
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, nonterminal_holder<proto::_, proto::_>
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, nonterminal_director
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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, nonterminal_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, nonterminal_meta_grammar> >::type>
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: mpl::identity<nonterminal_meta_grammar>
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{
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};
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}}}
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#endif
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