Vyacheslav E. Andrejev wrote:

boost::spirit::select_p parser can not be compiled with boost::spirit::rule as argument.

The problem is that metafunction boost::spirit::impl::as_embedded_parser<ParserT> returns const reference to boost::spirit::rule, not boost::spirit::rule itself, when PaerserT = boost::spirit::rule. So trying to compile parser_result<as_embedded_parser<rule<> > > deep inside the select_p implementation generates error message that const rule<>& has no result_type.

I suggest to change parser_result definition as following:

template <typename ParserT, typename ScannerT> struct parser_result { typedef typename boost::remove_reference<ParserT>::type::template result<ScannerT>::type type; };

I'll change that. Could you provide a minimal example exposing this problem, I'd like to add this as a test case. Regards Hartmut