Boost Users :
Subject: Re: [Boost-users] [iostreams] why doesn't file_sink flush?
From: eg (egoots_at_[hidden])
Date: 2009-05-04 19:43:27
Andrew Schweitzer wrote:
> I'm trying to chain debugging logs together with a filtering_ostream.
> I've discovered that I need to call flush() on the filtering_ostream to
> get characters to appear in console in a timely fashion. This flush()
> call doesn't causes the file to be flushed. After some digging, I've
> discovered that the boost::iostreams::file_sink doesn't have the
> flushable_tag (or implement flush). std::fstream does have a flush
> function, and if I use it directly (not chained into a
> filtering_ostream), the flush call works as you might expect.
> So what is the appropriate way of implementing this? Chaining multiple
> logs together seems like a great way to use iostreams library. And out
> of curiosity, why doesn't file_sink implement flushable_tag?
I am not sure if it is exactly your case, but you may wish to read the
In particular, read the posts by Jonathan Turkanis (iostreams author).
It may (or may not?) shed some additional light on flush and your needs.
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