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

On Sunday 30 March 2014 21:15:29 TONGARI J wrote:

2014-03-30 20:52 GMT+08:00 Andrey Semashev :

...

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 >

Thanks, this seems to work. Is it documented anywhere? Can I use it without safely?