Re: [Boost-users] Copy from stream to vector

From: Michael Linck (mgl_at_[hidden])
Date: 2007-10-30 20:46:47

You might be using the wrong copy.  From the STL documentation it looks
like std::copy might do exactly what you want:

"vector<int> V;
copy(istream_iterator<int>(cin), istream_iterator<int>(),
     back_inserter(V));"

from: http://www.sgi.com/tech/stl/istream_iterator.html

good luck,
mike

On Tue, 2007-10-30 at 11:45 -0700, Ricardo Mayerhofer wrote:
> Ops, sorry Michael, the example was inconsistent, the correct code is:
>     copy( istream_iterator<string>(FileSource), istream_iterator<string>
> (), back_inserter( m_StringVector ) )
> 
> Actually the class I use is not string, I just though it would make the
> example simpler.
> I use another streamable class which I save to a file and retrieve it
> later. (I cannot use serialization in this case, because the format
> matters, I mean, I have to save the class state in CSV format).
> 
> I tought something like this was possible reading the following topic
> when the lib was being developed:
> 
> http://lists.boost.org/Archives/boost/2004/09/71455.php
> > 2. Sources and sinks can be reused in cases where standard streams and
> stream
> > buffers are either unnecessary or are not the appropriate abstraction. For
> > example, suppose you want to write the concatenation of three files to a
> > string.
> > You can do so like this:
> >
> > string s;
> > boost::io::copy(
> > concatenate(
> > file_source("file1"),
> > file_source("file2"),
> > file_source("file3")
> > ),
> > back_insert_resource(s)
> > );
> 
> Thanks.
> 
> Michael Linck escreveu:
> > That copy writes from a Source to a Sink.  Do you need a vector of
> > Strings?  Why not a StringStream.  You might be able to use your copy on
> > a FileSource and copy to a StringStream.  Also your istream_iterator
> > types look inconsistent.
> >
> > mike
> >
> > On Thu, 2007-10-25 at 09:11 -0700, Ricardo Mayerhofer wrote:
> >   
> >> I mean copy of boost iostream:
> >> http://www.boost.org/libs/iostreams/doc/index.html
> >>
> >> Ricardo
> >>
> >>     
> >
> >   
> >>>          If so, how do I?
> >>>         
> >>>             eg. with std copy:
> >>>             copy( istream_iterator<string>(FileSource), 
> >>>         istream_iterator<FileSource> (),
> >>>         back_inserter( m_StringVector ) )
> >>>         
> >>>         Ricardo
> >>>         
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