#!/usr/bin/perl

# Copyright 2004-2017, Paul Johnson (paul@pjcj.net)

# This software is free.  It is licensed under the same terms as Perl itself.

# The latest version of this software should be available from my homepage:
# http://www.pjcj.net

sub unused { 0 }
sub empty  {   }

sub gen {
    my $x = shift;
    sub {
        my $y = shift;
        return $x + $y if $y;
    }
};

my $o = gen(1);
my $p = $o->(7);
my $q = $o->(8);
my $r = gen(1)->(2);
my $s = gen(3)->(4);
my $t = gen(5)->(6);

print "$p, $q, $r, $s, $t\n";

for my $func (qw(f1 f2 f3)) {
    no strict "refs";
    *$func = sub {
        print "$func\n";
    }
}

f1();
f2();

sub AUTOLOAD {
    my $func = $AUTOLOAD;
    $func =~ s/^.*:://;
    no strict "refs";
    if ($func eq "add") {
        *$func = sub {
            print "Add!\n";
        };
    } else {
        *$func = sub {
            print "$func\n";
        };
    }
    goto &$func
}

add();
add();
add();
qaz();
wsx();