Re: [m-users.] Coupling stdout and stderr

Volker Wysk <[email protected]> Wed, 15 Mar 2023 11:04:25 +0100

Newsgroups	gmane.comp.lang.mercury.general
Message-ID	<[email protected]>

Am Mittwoch, dem 15.03.2023 um 14:12 +1100 schrieb Julien Fischer:
> Hi Volker,
> 
> On Mon, 13 Mar 2023, Volker Wysk wrote:
> 
> > In C++ (and Haskell, I think) there's a feature which causes stdout to be
> > flushed before writing something to stderr. I'm not sure how this is called.
> > This way, the output on both streams occurs in the right order. Arbitrary
> > streams can be coupled that way.
> 
> In C++ you can tie an istream to an ostream using the tie() function. Is
> that what you were thinking of? 

Yes.

> It wouldn't help in this case because
> cerr and cout are both ostreams.

Yes, I was mistaken. But it would still make sense to tie stdout to stderr,
wouldn't it?

> 
> > I've looked through the io library, but couldn't find anything like that.
> > When you have a lot of output on stdout and then output something on stderr,
> > the order gets messed up. You have to manually flash stdout before writing
> > to stderr.
> 
> You could probably write something using the stdlib's stream interface
> that did that.

I'll take a look next time I need it.

Thanks

Volker

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