Re: [Boost-users] [iostreams] Inconsistent state of stream

Subject: Re: [Boost-users] [iostreams] Inconsistent state of stream
From: Anand Patel (anand.apatel_at_[hidden])
Date: 2010-05-03 02:00:47

Not sure if it is relevant but, boost::iostreams::copy() closes the stream
and calls destructor on it.  So my guess is states are reset upon
destruction.
-Anand

On Thu, Apr 29, 2010 at 1:00 PM, Nicola <nvitacolonna_at_[hidden]> wrote:

> Hi,
> can someone tell me if the behaviour of the enclosed example is a bug?
> In my test, the last two assertions fail, but I don't understand why
> (Boost 1.42.0).
>
> Thanks,
> Nicola
>
> #include <boost/iostreams/copy.hpp>
> #include <boost/iostreams/filtering_stream.hpp>
> #include <boost/iostreams/filter/bzip2.hpp>
> #include <cassert>
> #include <fstream>
> #include <sstream>
>
> struct bz2istream :
> public boost::iostreams::filtering_stream<boost::iostreams::input>
> {
> public:
>   bz2istream(std::string const& path) :
>      pBz2file(path.c_str(), std::ios_base::in | std::ios_base::binary)
>   {
>      push(boost::iostreams::bzip2_decompressor());
>      push(pBz2file);
>   }
> private:
>   std::ifstream pBz2file;
> };
>
> int main() {
>   bz2istream bzippedfile("foo.bz2");
>   std::ostringstream os;
>   boost::iostreams::copy(bzippedfile, os);
>
>   assert(!(bzippedfile.rdstate() & std::ios_base::goodbit)); // Ok
>   assert(bzippedfile.rdstate() & std::ios_base::eofbit); // Fails
>   assert(!(bzippedfile.good())); // Fails
> }
>
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