Re: [boost] [proto] what is a tag? (was Re: [boost:proto] adding new tags)

From: Maurizio Vitale (maurizio.vitale_at_[hidden])
Date: 2007-05-20 17:37:24

>
> What xpressive does instead is something like:
>
>    proto::and_<
>      proto::if_< is_quant_tag< proto::tag_of< mpl::_ > > >
>    , proto::unary_expr< proto::_, XpressiveGrammar >
>>
>

I think this is a good example of why my naming suggestion is not  
good. As I said you have in mind more uses then me.
The above written as

proto::all<
        proto::when< >,
         proto::unary_expr< >
 >

is not really palatable.