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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
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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