Re^2: Copy a builtin sub to a different name and then override ( goto &SUB )


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Re^2: Copy a builtin sub to a different name and then override ( goto &SUB )

by LanX (Saint)

on Jun 04, 2018 at 11:55 UTC ( [id://1215820]=note: print w/replies, xml )

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in reply to Re: Copy a builtin sub to a different name and then override
in thread Copy a builtin sub to a different name and then override

Hi Beech,

> # goto &CORE::hex; ## FAIL

I can't reproduce any problems with goto &SUB here.

Neither with hex nor with sleep .

How does it "fail" for you?

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

update

use strict;
use warnings;

warn "Version $]";
warn "Prototype", prototype "CORE::sleep";



my $sleepcounter;


BEGIN {

    *CORE::GLOBAL::sleep =  sub {
        warn  "start wrapper ($_[0])";
        $sleepcounter += int $_[0];
        goto &CORE::sleep;

    };
}


warn "return: ", sleep 2.3;

warn "total sleep( $sleepcounter )";
[download]

Version 5.016003 at d:/Users/lanx/pm/core_sleep.pl line 4.
Prototype;$ at d:/Users/lanx/pm/core_sleep.pl line 5.
start wrapper (2.3) at d:/Users/lanx/pm/core_sleep.pl line 15.
return: 2 at d:/Users/lanx/pm/core_sleep.pl line 23.
total sleep( 2 ) at d:/Users/lanx/pm/core_sleep.pl line 25.
[download]

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Re^3: Copy a builtin sub to a different name and then override ( goto &SUB ) by beech (Parson) on Jun 07, 2018 at 22:13 UTC
`# goto &CORE::hex; ## FAIL This works for me under 5.016003 even without the correct prototype:` [download] Hi, It turns out it works as designed, it merely returns different from CORE::hex(@_) , because of the prototype . I only checked for prototype on "hex" because it worked on "sleep", I forgot I preload Time::HiRes, I should have checked CORE::hex	[reply] [d/l]

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