Re: [Boost-users] [iostreams] why doesn't file_sink flush?

Subject: Re: [Boost-users] [iostreams] why doesn't file_sink flush?
From: eg (egoots_at_[hidden])
Date: 2009-05-05 14:23:02

Andy Schweitzer wrote:
> eg wrote:
>> Andrew Schweitzer wrote:

> 
> Thanks, I've read that, but it doesn't directly answer my questions. In 
> particular, a) fstream flush seems to work fine, so I'm curious why 
> file_sink doesn't call it and b) given that you can't flush a file_sink 
> what is the appropriate implementation - it seems like there would be 
> one that is relatively straight-forward.

Good questions.
I dont know why file_sink or file_descriptor_sink are not currently 
implemented with the flushable_tag.

It looks like it would be very straightforward to add.

My usage of iostreams has always involved the gzip filters, which are 
not flushable either, so I haven't run into this and don't have a 
solution... other than adding flush support to file_sink.

Is there more to it than adding the flushable_tag, and adding a flush 
function to basic_file_sink  and basic_file<Ch>, the latter simply 
calling pimpl->file_.flush() ?