Update of /cvsroot/boost/boost/boost/xpressive/detail/core/matcher
In directory
sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv7032/boost/xpressive/detail/core/matcher
Modified Files:
action_matcher.hpp
Log Message:
support for late-bound arguments in actions
Index: action_matcher.hpp
===================================================================
RCS file:
/cvsroot/boost/boost/boost/xpressive/detail/core/matcher/action_matcher.hpp,v
retrieving revision 1.7
retrieving revision 1.8
diff -u -d -r1.7 -r1.8
--- action_matcher.hpp 23 Mar 2007 21:43:13 -0000 1.7
+++ action_matcher.hpp 24 Mar 2007 10:07:30 -0000 1.8
@@ -94,12 +94,43 @@
};
///////////////////////////////////////////////////////////////////////////////
+ // action_arg_transform
+ //
+ template<typename Grammar>
+ struct action_arg_transform
+ : Grammar
+ {
+ action_arg_transform();
+
+ template<typename Expr, typename State, typename Visitor>
+ struct apply
+ {
+ typedef typename proto::result_of::arg<Expr>::type action_arg_type;
+ typedef typename action_arg_type::type arg_type;
+ typedef typename proto::terminal<arg_type &>::type type;
+ };
+
+ template<typename Expr, typename State, typename Visitor>
+ static typename apply<Expr, State, Visitor>::type
+ call(Expr const &expr, State const &state, Visitor &)
+ {
+ detail::action_args_type::iterator where =
state.action_args_->find(&typeid(proto::arg(expr)));
+ if(where == state.action_args_->end())
+ {
+ throw regex_error(regex_constants::error_badarg, "An argument
to an action was unspecified");
+ }
+ return proto::as_arg(proto::arg(expr).cast(where->second));
+ }
+ };
+
+
///////////////////////////////////////////////////////////////////////////////
// BindActionArgs
//
struct BindActionArgs
: proto::or_<
subreg_transform< proto::terminal<detail::any_matcher> >
, mark_transform< detail::mark_tag >
+ , action_arg_transform< proto::terminal< action_arg<proto::_,
proto::_> > >
, proto::terminal<proto::_>
, proto::nary_expr<proto::_, proto::vararg<BindActionArgs> >
>
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