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#!./perl
use strict;
use warnings;
use Test::More tests => 27;
use Config;
use List::Util qw(product);
my $v = product;
is( $v, 1, 'no args');
$v = product(9);
is( $v, 9, 'one arg');
$v = product(1,2,3,4);
is( $v, 24, '4 args');
$v = product(-1);
is( $v, -1, 'one -1');
$v = product(0, 1, 2);
is( $v, 0, 'first factor zero' );
$v = product(0, 1);
is( $v, 0, '0 * 1');
$v = product(1, 0);
is( $v, 0, '1 * 0');
$v = product(0, 0);
is( $v, 0, 'two 0');
# RT139601 cornercases
{
# Numify the result because some older perl versions see "-0" as a string
is( 0+product(-1.0, 0), 0, 'product(-1.0, 0)' );
is( 0+product(-1, 0), 0, 'product(-1, 0)' );
}
my $x = -3;
$v = product($x, 3);
is( $v, -9, 'variable arg');
$v = product(-3.5,3);
is( $v, -10.5, 'real numbers');
my $one = Foo->new(1);
my $two = Foo->new(2);
my $four = Foo->new(4);
$v = product($one,$two,$four);
is($v, 8, 'overload');
{ package Foo;
use overload
'""' => sub { ${$_[0]} },
'0+' => sub { ${$_[0]} },
fallback => 1;
sub new {
my $class = shift;
my $value = shift;
bless \$value, $class;
}
}
use Math::BigInt;
my $v1 = Math::BigInt->new(2) ** Math::BigInt->new(65);
my $v2 = $v1 - 1;
$v = product($v1,$v2);
is($v, $v1 * $v2, 'bigint');
$v = product(42, $v1);
is($v, $v1 * 42, 'bigint + builtin int');
$v = product(42, $v1, 2);
is($v, $v1 * 42 * 2, 'bigint + builtin int');
{ package example;
use overload
'0+' => sub { $_[0][0] },
'""' => sub { my $r = "$_[0][0]"; $r = "+$r" unless $r =~ m/^\-/; $r .= " [$_[0][1]]"; $r },
fallback => 1;
sub new {
my $class = shift;
my $this = bless [@_], $class;
return $this;
}
}
{
my $e1 = example->new(7, "test");
my $t = product($e1, 7, 7);
is($t, 343, 'overload returning non-overload');
$t = product(8, $e1, 8);
is($t, 448, 'overload returning non-overload');
$t = product(9, 9, $e1);
is($t, 567, 'overload returning non-overload');
}
SKIP: {
skip "IV is not at least 64bit", 8 unless $Config{ivsize} >= 8;
my $t;
my $min = -(1<<31);
my $max = (1<<31)-1;
$t = product($min, $min);
is($t, 1<<62, 'min * min');
$t = product($min, $max);
is($t, (1<<31) - (1<<62), 'min * max');
$t = product($max, $min);
is($t, (1<<31) - (1<<62), 'max * min');
$t = product($max, $max);
is($t, 4611686014132420609, 'max * max'); # (1<<62)-(1<<32)+1), but Perl 5.6 does not compute constant correctly
$t = product($min*8, $min);
cmp_ok($t, '>', (1<<61), 'min*8*min'); # may be an NV
$t = product($min*8, $max);
cmp_ok($t, '<', -(1<<61), 'min*8*max'); # may be an NV
$t = product($max, $min*8);
cmp_ok($t, '<', -(1<<61), 'min*max*8'); # may be an NV
$t = product($max, $max*8);
cmp_ok($t, '>', (1<<61), 'max*max*8'); # may be an NV
}
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