Re: [Boost-users] Question about ifstream ranges

From: shunsuke (pstade.mb_at_[hidden])
Date: 2007-03-08 04:46:26

Pfligersdorffer, Christian wrote:
>>> Any suggestions? Maybe some iterator-magic can be done?
>> How about Boost.Spirit file_iterator?
>> That is a read-only RandomAccessIterator for files.
>> http://spirit.sourceforge.net/distrib/spirit_1_8_3/libs/spirit
>> /doc/file_iterator.html
> 
> Hello Shunsuke, 
> 
> that's a good idea but unfortunately I cannot use this class in my case. I have some special decoding ifstreams doing decompression and the like. So I'd really need an iterator that takes an i(f)stream object in it's constructor and wraps that.

C++ has istream_iterator, but it seems useless in this case.
In fact, istream_iterator can be converted into ForwardIterator using
Boost.Spirit multi_pass iterator.
http://spirit.sourceforge.net/distrib/spirit_1_8_3/libs/spirit/doc/multi_pass.html
Thus you can make portions before passing them to clients.
But unfortunately multi_pass iterator may copy the whole range in many 
cases.

Regards,

-- 
Shunsuke Sogame