$io->autoflush - which perl version?

Doug_H has asked for the wisdom of the Perl Monks concerning the following question:

Hi there,

I would like to use $io->autoflush(1)from IO::Handle. Unfortunately it looks like in perl v5.10.0 it is not included in the core module. It works fine with version 5.16.2.

Therefore I have 2 questions and hopefully you can help me.

1) Which perl version did add autoflush to the default core module?

2) How can I implement it that it is activated when the method is there. Something like this …

 
if (v.5.x.x. or higher)
}
$io->autoflush(1);
}
[download]

For any other ideas how I can solve that it works with 5.10.0 and all newer versions I would be very happy - thanks.

Thanks for your help.

Kind regards

Doug EDIT:

Sorry ... it looks like that it works when I add use IO::Handle;.

It is not necessary with version 5.16.2 but required for 5.10.0 ?!

Any idea why the different behaviour?

Comment on $io->autoflush - which perl version? Select or Download Code

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Re: $io->autoflush - which perl version? by choroba (Cardinal) on Mar 27, 2016 at 19:53 UTC
See the delta for 5.12: > Filehandles are now always blessed into IO::File ($q=q:Sq=~/;[c](.)(.)/;chr(-\|\|-\|5+lengthSq)`"S\|oS2"`map{chr \|+ord }map{substrSq`S_+\|`\|}3E\|-\|`7**2-3:)=~y+S\|`+$1,++print+eval$q,q,a, [download]	[reply] [d/l]
Re: $io->autoflush - which perl version? by Anonymous Monk on Mar 27, 2016 at 19:53 UTC
AFAIK for `$io->autoflush(1);` to work you just have to add `use IO::Handle;` at the top of your code; should work all the way back to at least 5.8. Perl 5.14 and up loads IO::Handle automatically, which is why the "autoflush" method "just works" there. The command "corelist IO::Handle" says "IO::Handle was first released with perl 5.00307". The other kind of kludgy but AFAIK backwards-compatible way to set autoflush on a handle is `{ my $tmp = select($io); $\| = 1; select($tmp) }`. And your "if" statement could be written like this: `if($] lt "5.008") ...`	[reply] [d/l] [select]
Re: $io->autoflush - which perl version? by zwon (Abbot) on Mar 27, 2016 at 21:49 UTC
It will work in 5.10 too if you add `use IO::Handle`	[reply] [d/l]
Re: $io->autoflush - which perl version? by stevieb (Canon) on Mar 27, 2016 at 19:50 UTC
1) looks like v5.14. 2) I think `$\| = 1;` is what you want. See perlvar.	[reply] [d/l]