Eric Niebler wrote:
> On 12/7/2010 2:37 PM, Thomas Heller wrote:
>> Hi,
>>
>> I have been trying to extend a domain by "subdomaining" it. The sole
>> purpose of this subdomain was to allow another type of terminal
>> expression.
>>
>> Please see the attached code, which is a very simplified version of what
>> I was trying to do.
> <snip>
>
>> So, How to handle that correctly?
>
> Yup, that's a problem. I don't have an answer for you at the moment,
> sorry.
This is a real bummer ... I need it for the phoenix local variables :(
I might be able to work something out ... The idea is the following:
template <typename Expr>
struct grammar_of
{
typedef typename proto::domain_of<Expr>::type domain_type;
typedef typename domain_type::proto_grammar type;
};
struct grammar
: proto::or_<
proto::plus<
grammar_of<_child_c<0> >()
, grammar_of<_child_c<1> >()
>
>
{};
This looks just insane though ... But looks like what I want ... need to
test this properly ...
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