Re: stl copy and istream_iterator and operator >>

Path	csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder2.enfer-du-nord.net!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From	Ian Collins <ian-news@hotmail.com>
Newsgroups	comp.lang.c++
Subject	Re: stl copy and istream_iterator and operator >>
Date	Mon, 19 Sep 2011 09:47:59 +1200
Lines	29
Message-ID	<9dn78fFr5dU9@mid.individual.net> (permalink)
References	<cd8da4eb-33c9-4b2f-8d75-b2348dcc33a0@s7g2000yqd.googlegroups.com>
Mime-Version	1.0
Content-Type	text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding	7bit
X-Trace	individual.net QqsNXk5csNMdtNmijZO73wz1AhyPWFMjAngxpFaqkQtj6L9+91
Cancel-Lock	sha1:Mnc+UaeNc9wx5Z/62CkCAQ+fXYw=
User-Agent	Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:1.9.2.9) Gecko/20101021 Lightning/1.0b2 Thunderbird/3.1.4
In-Reply-To	<cd8da4eb-33c9-4b2f-8d75-b2348dcc33a0@s7g2000yqd.googlegroups.com>
Xref	x330-a1.tempe.blueboxinc.net comp.lang.c++:10260

Show key headers only | View raw

On 09/19/11 09:27 AM, persres@googlemail.com wrote:
> Hi,
>      I have the following code -
>
> string str("12 3213 asdf 21");
> vector<int>  v;
>
> copy(istream_iterator<int>(istringstream(str)) ,
> istream_iterator<int>(),  back_inserter(v) );

This shouldn't compile. You can't create an istream_iterator from a 
temporary.

> I expected copy to throw because the operator>>  would have failed due
> to the 'asdf' string present.

Which operator >>?

> However, it doesn't throw.  Do you know why,

Because the code doesn't do what you think it does (assuming you get it 
to compile).  Have a look at the vector contents.

> How can i get it to throw or return an errror.

You can provide your own input iterator type.

-- 
Ian Collins

Thread

stl copy and  istream_iterator and operator >> "persres@googlemail.com" <persres@gmail.com> - 2011-09-18 14:27 -0700
  Re: stl copy and  istream_iterator and operator >> Ian Collins <ian-news@hotmail.com> - 2011-09-19 09:47 +1200
    Re: stl copy and istream_iterator and operator >> "persres@googlemail.com" <persres@gmail.com> - 2011-09-18 14:53 -0700
      Re: stl copy and istream_iterator and operator >> Ian Collins <ian-news@hotmail.com> - 2011-09-19 10:00 +1200
        Re: stl copy and istream_iterator and operator >> "persres@googlemail.com" <persres@gmail.com> - 2011-09-18 15:11 -0700
          Re: stl copy and istream_iterator and operator >> red floyd <no.spam.here@its.invalid> - 2011-09-18 15:23 -0700
          Re: stl copy and istream_iterator and operator >> Ian Collins <ian-news@hotmail.com> - 2011-09-19 10:23 +1200
            Re: stl copy and istream_iterator and operator >> James Kanze <james.kanze@gmail.com> - 2011-09-19 15:19 -0700
    Re: stl copy and  istream_iterator and operator >> Ian Collins <ian-news@hotmail.com> - 2011-09-19 10:11 +1200

csiph-web