Re: [boost] [proprocessor] PP challenge!

From: Eric Niebler (eric_at_[hidden])
Date: 2006-11-05 13:59:00

Tobias Schwinger wrote:
> Daniel Wallin wrote:
>> Eric Niebler wrote:
>>
>>> I'd still be curious what a PP solution looks like, though. The 
>>> problem stumped me for quite some time.
>>
>>
>> I'll bite. It's a bit of a hack, but it works. :) It basically
>> accumulates the closing >'s as it goes, and expands them after the last
>> item. It keeps a looping counter that keeps track of when to split into
>> another mpl::and_<>.
>>
> 
> Here is an alternative implementation with a similar approach, using a 
> sequence to "escape" the commas and SEQ_ENUM for "unescaping".

<snip>

WOW! That's cool.

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