Re: [Boost-users] [iostreams] Closing a filtering_ostream

From: Jonathan Turkanis (technews_at_[hidden])
Date: 2005-10-06 13:09:33

Paul Giaccone wrote:
> Paul Giaccone wrote:
>
>> How do you close a filtering_ostream object once you have finished
>> writing to it?
>>
>>
> I tried calling out.reset() to the filtering_ostream object.  This has
> the desired effect, as the data is written to file before "out" falls
> out of scope, but then when the end of the scope is reached, my
> program crashes in the destructor.

Could you post the program (or a simplified version)? When I add reset() to the
program in your previous message, it works fine.

> If this is not the right way to flush the stream, what should I be
> doing instead?  I tried strict_sync() but this returned false because
> it looks as though the compressor is not flushable (although I could
> not find anything about this in the documentation).

Right, the compressors are not flushable. The purpose of strict_sync() is to
allow you to switch filters in the middle of a sequence of i/o operations. With
compression, switching filters before all the data is compressed will generally
result in garbage, so there's no point trying to implement flush().

> Paul Giaccone

-- 
Jonathan Turkanis
www.kangaroologic.com