RE: [boost] [spirit] select_p problem

From: Hartmut Kaiser (hartmutkaiser_at_[hidden])
Date: 2004-11-05 01:58:28

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