[m-users.] Coupling stdout and stderr

Volker Wysk <[email protected]> Mon, 13 Mar 2023 09:55:13 +0100

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

Hi!

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.

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.

It isn't necessary to do this coupling in the opposite direction, because
stderr isn't buffered.

I'd like to suggest to add such a feature to the io library.

Cheers, 
Volker

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