[Boost-bugs] [Boost C++ Libraries] #1033: iostreams::restrict doesn't work on an iostreams::file_source

Subject: [Boost-bugs] [Boost C++ Libraries] #1033: iostreams::restrict doesn't work on an iostreams::file_source
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2007-06-05 03:27:07

#1033: iostreams::restrict doesn't work on an iostreams::file_source
----------------------------+-----------------------------------------------
 Reporter:  phil_at_[hidden]  |        Type:  Bugs            
   Status:  new             |   Milestone:  To Be Determined
Component:  None            |     Version:  release 1.34.0  
 Severity:  Problem         |    Keywords:  iostreams       
----------------------------+-----------------------------------------------
 I ran into a problem when using restrict on a file_source. The problem was
 that it decided that the stream wasn't seekable and called the version of
 skip that reads a character at a time until it gets to the requested
 offset, instead of just calling seek.

 The code was similar to this:


 {{{
 namespace io = boost::iostreams;

 std::string filename;
 io::filtering_istream rstr(io::restrict(io::file_source(filename), 10,
 100));
 }}}

 I've attached a patch that solved my problem. It was checking to see if
 the device was seekable (which means both input_seekable and
 output_seekable), but since it was an input device, it was just
 input_seekable.

-- 
Ticket URL: <http://svn.boost.org/trac/boost/ticket/1033>
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