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|
=pod
=encoding utf-8
=head1 PURPOSE
Various tests of named and anonymous functions closing over variables.
=head1 AUTHOR
Toby Inkster E<lt>tobyink@cpan.orgE<gt>.
=head1 COPYRIGHT AND LICENCE
This software is copyright (c) 2013-2014, 2017 by Toby Inkster.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
use strict;
use warnings;
use Test::More;
use Test::Fatal;
my $x;
BEGIN { $x = 1 };
package Foo {
use Kavorka;
method new ($class: ...) {
bless {}, $class;
}
method inc { ++$x }
method dec { --$x }
}
subtest "Two functions closing over the same variable" => sub
{
my $foo = Foo->new;
is($x, 1);
is($foo->inc, 2);
is($foo->inc, 3);
is($x, 3);
is($foo->dec, 2);
is($foo->dec, 1);
is($x, 1);
};
package Goo {
use Kavorka;
method xyz {
my @links;
fun my $xxx { push @links, 42 };
$xxx->();
return \@links;
}
}
subtest "Closing over a variable in a lexical function" => sub
{
is_deeply(Goo->xyz, [42]);
is_deeply(Goo->xyz, [42]);
is_deeply(Goo->xyz, [42]);
};
package Hoo {
use Kavorka;
method xyz ($closeme) {
my $f = fun ($vvv = $closeme) { $vvv };
return (\$closeme, $f);
}
}
subtest "Closing over a variable in a default" => sub
{
my ($X1, $fourtytwo) = Hoo->xyz(42);
is($fourtytwo->(666), 666);
is($fourtytwo->(), 42);
my ($X2, $sixsixsix) = Hoo->xyz(666);
is($sixsixsix->(999), 999);
is($sixsixsix->(), 666);
$$X2 = 777;
is($sixsixsix->(), 777);
};
package Ioo {
use Kavorka;
method get_limit ($limit) {
fun (Int $x where { $_ < $limit }) { 1 };
}
}
subtest "Closing over a variable in a where {} block" => sub
{
my $lim7 = Ioo->get_limit(7);
ok $lim7->(6);
ok exception { $lim7->(8) };
my $lim12 = Ioo->get_limit(12);
ok $lim12->(8);
ok exception { $lim12->(14) };
ok $lim7->(6);
ok exception { $lim7->(8) };
};
package Joo {
use Kavorka;
method get_set ($x) {
return (
fun () { $x },
fun ($y) { $x = $y },
);
}
}
subtest "Two anonymous functions closing over the same variable" => sub
{
my ($g, $s) = Joo->get_set(20);
my ($g2, $s2) = Joo->get_set(666);
is($g->(), 20);
is($s->(21), 21);
is($g->(), 21);
is($s->($g->() * 2), 42);
is($g->(), 42);
is($g2->(), 666);
};
done_testing;
|
