Re: [boost] [boost:proto] adding new tags

From: Eric Niebler (eric_at_[hidden])
Date: 2007-05-20 16:37:14

Maurizio Vitale wrote:
> Eric Niebler <eric_at_[hidden]> writes:
> 
>> Right. I should have suggested that in the first place. I tend to think 
>> this approach (declaring an empty terminal and using its operator()()) 
>> is nicer because it reuses more of proto's machinery, but the two 
>> approaches are equivalent.
>>
>> There are cases where this approach doesn't work, however. For example, 
>> in xpressive, there is a repeat<>() function, for repeating 
>> sub-expressions. For instance:
>>
>>    repeat<3,6>('a')
>>
> 
> But even there you could have had repeat< > return a proto::terminal and
> then let the generic overloading of operator()() take care of the rest.

Are you sure about that? :-)

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com