RE: [boost] Formal Review: The Spirit Parser Framework.

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2002-10-21 01:01:17

Dan Nuffer wrote:
> As the author of multi_pass, I had originally envisioned submitting 
> it separate from spirit.  But, one day I realized that I couldn't 
> think of a use for it outside of spirit.  Maybe I'm just not 
> imaginitive enough! But, I personally never had the need to convert 
> an input iterator into a forward iterator, other than with spirit.  

Here is an easy use case - one wants to know how many elements are in the
input sequence _before_ the actual processing happens, even if at the cost
of additional iteration through the sequence:

    template< typename Iterator >
    void do_input(Iterator first, Iterator last)
    {{
        multi_pass<Iterator> first(first);
        multi_pass<Iterator> last(last);
         
        std::size_t size = std::distance(first, last);
        // using size/fist/last...
    }}

> So, if there is some interest, I'll submit it.

I thought it's being submitted as a part of Spirit anyway ;). IMO it's
definitely should be factored out into a standalone mini-library.

Aleksey