Re: [boost] [spirit] How to detect Spirit.Qi expressions?

Subject: Re: [boost] [spirit] How to detect Spirit.Qi expressions?
From: TONGARI J (tongari95_at_[hidden])
Date: 2014-03-30 09:15:29

2014-03-30 20:52 GMT+08:00 Andrey Semashev <andrey.semashev_at_[hidden]>:

> Hi,
>
> Is there a way to detect at compile time that a certain type is a
> Boost.Spirit.Qi parser? That includes template expressions and grammars.
> Basically, I want to detect if qi::parse(b, e, expr) would be a sensible
> thing
> to do.
>
> I tried this:
>
>   boost::is_same<
>     typename proto::domain_of< ExpressionT >::type,
>     spirit::qi::domain
>   >
>
> But domain_of returns default_domain for Boost.Spirit.Qi template
> expressions.
>

Try this:
boost::spirit::traits::matches< Domain, Expr >