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This queue is for tickets about the Scalar-List-Utils CPAN distribution.

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Id: 47504
Status: resolved
Priority: 0/
Queue: Scalar-List-Utils

Owner: Nobody in particular
Requestors: zzgrim [...]

Bug Information
Severity: (no value)
Broken in: (no value)
Fixed in: (no value)

Subject: sum, overload and bigint
Date: Thu, 2 Jul 2009 12:30:54 +0300
To: bug-Scalar-List-Utils [...]
From: zgrim <zzgrim [...]>
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Sorry if this has been reported/addressed before, i don't find traces of it. In short, sum() (both XS and PP) ignores possible (lexical) overloadings, which causes problems under, for example, the bigint pragma. IMHO, this should be addressed by either issuing a warning in the documentation, for people not to have the wrong expectations, or by following the overlo(?:a|r)ds. ( checking $^H ? ) Example: ----- #! /usr/bin/perl use warnings 'FATAL' => 'all'; use strict; use 5.010; use List::Util (); my @x = qw( 12345678101234567810123456781012345678101234567832 18765432101876543210187654321018765432101876543226 14321678105432167810543216781054321678105432167874 ); { use bigint; my $sum = sub { my $s = 0; $s += $_ for @_; $s }; say q{(bigint ON) sum @x = }, $sum->( @x ); say q{(bigint ON) List::Util::sum @x = }, List::Util::sum( @x ); } { no bigint; my $sum = sub { my $s = 0; $s += $_ for @_; $s }; say q{(bigint OFF) sum @x = }, $sum->( @x ); say q{(bigint OFF) List::Util::sum @x = }, List::Util::sum( @x ); } __END__ (bigint ON) sum @x = 45432788308543278830854327883085432788308543278932 (bigint ON) List::Util::sum @x = 4.54327883085433e+49 (bigint OFF) sum @x = 4.54327883085433e+49 (bigint OFF) List::Util::sum @x = 4.54327883085433e+49 -----
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I disagree that there is a general expectation that all subroutines in perl honor lexical pragmas from their caller. I would say it is the opposite in that it is the exception that they do

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