/usr/share/doc/libhook-lexwrap-perl/examples/demo_temp.pl is in libhook-lexwrap-perl 0.25-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | #!/usr/bin/perl
use Hook::LexWrap;
my $temp;
sub set_temp {
my $oldtemp = $temp;
$temp = shift;
print "Temp now $temp\n";
return $oldtemp;
}
print "Setting temp to 73 F...\n";
my $prev = set_temp(73);
print "Temp was ", $prev||"undef", " F\n";
print "Setting temp to 98 F...\n";
$prev = set_temp(98);
print "Temp was ", $prev, " F\n";
{
my $lexical = wrap set_temp,
pre => sub { splice @_, 0, 1, $_[0] * 1.8 + 32 },
post => sub { $_[-1] = ($_[0] - 32) / 1.8 };
print "Setting temp to 73 C...\n";
my $prev = set_temp(73);
print "Temp was ", $prev, " C\n";
}
print "Setting temp to 98 F...\n";
$prev = set_temp(98);
print "Temp was ", $prev, " F\n";
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