Re: [Monotone-devel] Monotone ID shortener

[Christof Petig]

Nathan Myers schrieb:
> On Fri, Apr 30, 2004 at 05:40:22PM +0200, Christof Petig wrote:
>
> > monoshort "monotone --db monotone.db" > short.sed
> >
> > PS: No, _I_ did _not_ design the semantics of underflow/uflow, I only 
> > struggled to implement them.
>
>
> Probably you would do better to extract the file descriptor from the
> FILE returned by popen, and then attach a buffering streambuf to it.

That's what I did in the 2.95 days. But I don't see any standard way to 
get a stream from the file number. Reading more closely i think you 
proposed to extract some internal data structure from FILE which (on Gnu 
libc systems) is used to construct a streambuf?

> (It probably would be little more than two orders of magnitude faster.)

I don't see that that would be a lot faster since FILE* handles 
buffering for me. But perhaps a more sophisticated savailcount permits 
optimizations like reading more characters at once.

> What you really want, most likely, is Jonathan Wakely's streambuf 
> equivalent to popen that attaches streambufs instead of FILE*s.  In 
> the meantime, here are some fd streambufs and streams.  

You are right. Why did I not find them the last time I looked for it :-( ?

BTW: What is the license of the code you sent to me? May I add it to a 
GPL library?

   Christof