Re: [boost] Counted istream_iterator

From: Dylan Nicholson (dylan_nicholson_at_[hidden])
Date: 2002-03-21 22:33:50

 --- Gennadiy Rozental <rogeeff_at_[hidden]> wrote: > --- "Sean Wilson"
<smileyhamster_at_[hidden]> wrote:
> >My proposal is for a istream_iterator that counts how many elements have
> >been extracted so far and then indicates the end of the sequence when all 
> >the required elements have been extracted or a failure occurs.
> 
> I think simple iterator adaptor would do the work. Is it what are you using?
> 
One thing to watch for is that almost every implementation of istream_iterator
that exists "reads ahead" - so for instance if you copy 10 elements from an
istream_iterator using *i++, it will actually extract 11 elements, often
resulting in one going missing.  It's actually not difficult to write an
istream_iterator that doesn't do this, but it's not clear what the standard
mandates in this area.

Dylan

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