1#!./perl
2
3use strict;
4use warnings;
5
6use Test::More tests => 18;
7
8use Config;
9use List::Util qw(sum);
10
11my $v = sum;
12is( $v, undef, 'no args');
13
14$v = sum(9);
15is( $v, 9, 'one arg');
16
17$v = sum(1,2,3,4);
18is( $v, 10, '4 args');
19
20$v = sum(-1);
21is( $v, -1, 'one -1');
22
23my $x = -3;
24
25$v = sum($x, 3);
26is( $v, 0, 'variable arg');
27
28$v = sum(-3.5,3);
29is( $v, -0.5, 'real numbers');
30
31$v = sum(3,-3.5);
32is( $v, -0.5, 'initial integer, then real');
33
34my $one = Foo->new(1);
35my $two = Foo->new(2);
36my $thr = Foo->new(3);
37
38$v = sum($one,$two,$thr);
39is($v, 6, 'overload');
40
41
42{ package Foo;
43
44use overload
45  '""' => sub { ${$_[0]} },
46  '0+' => sub { ${$_[0]} },
47  fallback => 1;
48  sub new {
49    my $class = shift;
50    my $value = shift;
51    bless \$value, $class;
52  }
53}
54
55use Math::BigInt;
56my $v1 = Math::BigInt->new(2) ** Math::BigInt->new(65);
57my $v2 = $v1 - 1;
58$v = sum($v1,$v2);
59is($v, $v1 + $v2, 'bigint');
60
61$v = sum(42, $v1);
62is($v, $v1 + 42, 'bigint + builtin int');
63
64$v = sum(42, $v1, 2);
65is($v, $v1 + 42 + 2, 'bigint + builtin int');
66
67{ package example;
68
69  use overload
70    '0+' => sub { $_[0][0] },
71    '""' => sub { my $r = "$_[0][0]"; $r = "+$r" unless $r =~ m/^\-/; $r .= " [$_[0][1]]"; $r },
72    fallback => 1;
73
74  sub new {
75    my $class = shift;
76
77    my $this = bless [@_], $class;
78
79    return $this;
80  }
81}
82
83{
84  my $e1 = example->new(7, "test");
85  my $t = sum($e1, 7, 7);
86  is($t, 21, 'overload returning non-overload');
87  $t = sum(8, $e1, 8);
88  is($t, 23, 'overload returning non-overload');
89  $t = sum(9, 9, $e1);
90  is($t, 25, 'overload returning non-overload');
91}
92
93SKIP: {
94  skip "IV is not at least 64bit", 4 unless $Config{ivsize} >= 8;
95
96  # Sum using NV will only preserve 53 bits of integer precision
97  my $t = sum(1152921504606846976, 1); # 1<<60, but Perl 5.6 does not compute constant correctly
98  cmp_ok($t, 'gt', 1152921504606846976, 'sum uses IV where it can'); # string comparison because Perl 5.6 does not compare it numerically correctly
99
100  SKIP: {
101    skip "known to fail on $]", 1 if $] le "5.006002";
102    $t = sum(1<<60, 1);
103    cmp_ok($t, '>', 1<<60, 'sum uses IV where it can');
104  }
105
106  my $min = -(1<<63);
107  my $max = 9223372036854775807; # (1<<63)-1, but Perl 5.6 does not compute constant correctly
108
109  $t = sum($min, $max);
110  is($t, -1, 'min + max');
111  $t = sum($max, $min);
112  is($t, -1, 'max + min');
113}
114