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Good point, but there's actually another problem I forgot to mention. In a &{}, undef is code.

use strict; use warnings; use Test::More 'tests' => 3; sub is_code { no warnings qw( void uninitialized ); return eval { defined &{$_[0]}; 1 }; } sub real_sub { die 'real sub called' } my $sub_ref = sub { die 'sub ref called' }; my $undef; ok( is_code( \&real_sub ), 'real sub ref is code' ); ok( is_code( $sub_ref ), 'lexical sub ref is code' ); ok( is_code( $undef ), 'undef is code' );

This isn't a big deal, I guess. We just have to change is_code to return defined $_[0] && eval { defined &{$_[0]}; 1 };. Still, I'd rather call something that figures out what it is than call it to figure out what it is.

In reply to Re^2: Reference assessment techniques and how they fail by kyle
in thread Reference assessment techniques and how they fail by kyle

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