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Re: testing $/ with in memory files
[perl5.git] / lib / overload.t
CommitLineData
8ebc5c01
PP
1#!./perl
2
3BEGIN {
4 chdir 't' if -d 't';
20822f61 5 @INC = '../lib';
78cd8b71 6 require Config;
98641f60 7 if (($Config::Config{'extensions'} !~ m!\bList/Util\b!) ){
78cd8b71
NC
8 print "1..0 # Skip -- Perl configured without List::Util module\n";
9 exit 0;
10 }
8ebc5c01
PP
11}
12
8ebc5c01
PP
13package Oscalar;
14use overload (
15 # Anonymous subroutines:
16'+' => sub {new Oscalar $ {$_[0]}+$_[1]},
17'-' => sub {new Oscalar
18 $_[2]? $_[1]-${$_[0]} : ${$_[0]}-$_[1]},
19'<=>' => sub {new Oscalar
20 $_[2]? $_[1]-${$_[0]} : ${$_[0]}-$_[1]},
21'cmp' => sub {new Oscalar
22 $_[2]? ($_[1] cmp ${$_[0]}) : (${$_[0]} cmp $_[1])},
23'*' => sub {new Oscalar ${$_[0]}*$_[1]},
24'/' => sub {new Oscalar
25 $_[2]? $_[1]/${$_[0]} :
26 ${$_[0]}/$_[1]},
27'%' => sub {new Oscalar
28 $_[2]? $_[1]%${$_[0]} : ${$_[0]}%$_[1]},
29'**' => sub {new Oscalar
30 $_[2]? $_[1]**${$_[0]} : ${$_[0]}-$_[1]},
31
32qw(
33"" stringify
b0bf6df7 340+ numify) # Order of arguments insignificant
8ebc5c01
PP
35);
36
37sub new {
38 my $foo = $_[1];
39 bless \$foo, $_[0];
40}
41
42sub stringify { "${$_[0]}" }
43sub numify { 0 + "${$_[0]}" } # Not needed, additional overhead
44 # comparing to direct compilation based on
45 # stringify
46
47package main;
48
8ebc5c01 49$| = 1;
800401ee 50use Test::More tests => 556;
b1fbf5c3 51
8ebc5c01
PP
52
53$a = new Oscalar "087";
54$b= "$a";
55
b1fbf5c3
NC
56is($b, $a);
57is($b, "087");
58is(ref $a, "Oscalar");
59is($a, $a);
60is($a, "087");
8ebc5c01
PP
61
62$c = $a + 7;
63
b1fbf5c3
NC
64is(ref $c, "Oscalar");
65isnt($c, $a);
66is($c, "94");
8ebc5c01
PP
67
68$b=$a;
69
b1fbf5c3 70is(ref $a, "Oscalar");
8ebc5c01
PP
71
72$b++;
73
b1fbf5c3
NC
74is(ref $b, "Oscalar");
75is($a, "087");
76is($b, "88");
77is(ref $a, "Oscalar");
8ebc5c01
PP
78
79$c=$b;
80$c-=$a;
81
b1fbf5c3
NC
82is(ref $c, "Oscalar");
83is($a, "087");
84is($c, "1");
85is(ref $a, "Oscalar");
8ebc5c01
PP
86
87$b=1;
88$b+=$a;
89
b1fbf5c3
NC
90is(ref $b, "Oscalar");
91is($a, "087");
92is($b, "88");
93is(ref $a, "Oscalar");
8ebc5c01
PP
94
95eval q[ package Oscalar; use overload ('++' => sub { $ {$_[0]}++;$_[0] } ) ];
96
97$b=$a;
98
b1fbf5c3 99is(ref $a, "Oscalar");
8ebc5c01
PP
100
101$b++;
102
b1fbf5c3
NC
103is(ref $b, "Oscalar");
104is($a, "087");
105is($b, "88");
106is(ref $a, "Oscalar");
8ebc5c01
PP
107
108package Oscalar;
109$dummy=bless \$dummy; # Now cache of method should be reloaded
110package main;
111
112$b=$a;
113$b++;
114
b1fbf5c3
NC
115is(ref $b, "Oscalar");
116is($a, "087");
117is($b, "88");
118is(ref $a, "Oscalar");
8ebc5c01 119
32251b26 120undef $b; # Destroying updates tables too...
8ebc5c01
PP
121
122eval q[package Oscalar; use overload ('++' => sub { $ {$_[0]} += 2; $_[0] } ) ];
123
124$b=$a;
125
b1fbf5c3 126is(ref $a, "Oscalar");
8ebc5c01
PP
127
128$b++;
129
b1fbf5c3
NC
130is(ref $b, "Oscalar");
131is($a, "087");
132is($b, "88");
133is(ref $a, "Oscalar");
8ebc5c01
PP
134
135package Oscalar;
136$dummy=bless \$dummy; # Now cache of method should be reloaded
137package main;
138
139$b++;
140
b1fbf5c3
NC
141is(ref $b, "Oscalar");
142is($a, "087");
143is($b, "90");
144is(ref $a, "Oscalar");
8ebc5c01
PP
145
146$b=$a;
147$b++;
148
b1fbf5c3
NC
149is(ref $b, "Oscalar");
150is($a, "087");
151is($b, "89");
152is(ref $a, "Oscalar");
8ebc5c01
PP
153
154
b1fbf5c3 155ok($b? 1:0);
8ebc5c01
PP
156
157eval q[ package Oscalar; use overload ('=' => sub {$main::copies++;
158 package Oscalar;
159 local $new=$ {$_[0]};
160 bless \$new } ) ];
161
162$b=new Oscalar "$a";
163
b1fbf5c3
NC
164is(ref $b, "Oscalar");
165is($a, "087");
166is($b, "087");
167is(ref $a, "Oscalar");
8ebc5c01
PP
168
169$b++;
170
b1fbf5c3
NC
171is(ref $b, "Oscalar");
172is($a, "087");
173is($b, "89");
174is(ref $a, "Oscalar");
175is($copies, undef);
8ebc5c01
PP
176
177$b+=1;
178
b1fbf5c3
NC
179is(ref $b, "Oscalar");
180is($a, "087");
181is($b, "90");
182is(ref $a, "Oscalar");
183is($copies, undef);
8ebc5c01
PP
184
185$b=$a;
186$b+=1;
187
b1fbf5c3
NC
188is(ref $b, "Oscalar");
189is($a, "087");
190is($b, "88");
191is(ref $a, "Oscalar");
192is($copies, undef);
8ebc5c01
PP
193
194$b=$a;
195$b++;
196
b1fbf5c3
NC
197is(ref $b, "Oscalar");
198is($a, "087");
199is($b, "89");
200is(ref $a, "Oscalar");
201is($copies, 1);
8ebc5c01
PP
202
203eval q[package Oscalar; use overload ('+=' => sub {$ {$_[0]} += 3*$_[1];
204 $_[0] } ) ];
205$c=new Oscalar; # Cause rehash
206
207$b=$a;
208$b+=1;
209
b1fbf5c3
NC
210is(ref $b, "Oscalar");
211is($a, "087");
212is($b, "90");
213is(ref $a, "Oscalar");
214is($copies, 2);
8ebc5c01
PP
215
216$b+=$b;
217
b1fbf5c3
NC
218is(ref $b, "Oscalar");
219is($b, "360");
220is($copies, 2);
8ebc5c01
PP
221$b=-$b;
222
b1fbf5c3
NC
223is(ref $b, "Oscalar");
224is($b, "-360");
225is($copies, 2);
8ebc5c01
PP
226
227$b=abs($b);
228
b1fbf5c3
NC
229is(ref $b, "Oscalar");
230is($b, "360");
231is($copies, 2);
8ebc5c01
PP
232
233$b=abs($b);
234
b1fbf5c3
NC
235is(ref $b, "Oscalar");
236is($b, "360");
237is($copies, 2);
8ebc5c01
PP
238
239eval q[package Oscalar;
240 use overload ('x' => sub {new Oscalar ( $_[2] ? "_.$_[1]._" x $ {$_[0]}
241 : "_.${$_[0]}._" x $_[1])}) ];
242
243$a=new Oscalar "yy";
244$a x= 3;
b1fbf5c3 245is($a, "_.yy.__.yy.__.yy._");
8ebc5c01
PP
246
247eval q[package Oscalar;
248 use overload ('.' => sub {new Oscalar ( $_[2] ?
249 "_.$_[1].__.$ {$_[0]}._"
250 : "_.$ {$_[0]}.__.$_[1]._")}) ];
251
252$a=new Oscalar "xx";
253
b1fbf5c3 254is("b${a}c", "_._.b.__.xx._.__.c._");
8ebc5c01
PP
255
256# Check inheritance of overloading;
257{
258 package OscalarI;
259 @ISA = 'Oscalar';
260}
261
262$aI = new OscalarI "$a";
b1fbf5c3
NC
263is(ref $aI, "OscalarI");
264is("$aI", "xx");
265is($aI, "xx");
266is("b${aI}c", "_._.b.__.xx._.__.c._");
8ebc5c01
PP
267
268# Here we test blessing to a package updates hash
269
270eval "package Oscalar; no overload '.'";
271
b1fbf5c3 272is("b${a}", "_.b.__.xx._");
8ebc5c01
PP
273$x="1";
274bless \$x, Oscalar;
b1fbf5c3 275is("b${a}c", "bxxc");
8ebc5c01 276new Oscalar 1;
b1fbf5c3 277is("b${a}c", "bxxc");
8ebc5c01
PP
278
279# Negative overloading:
280
281$na = eval { ~$a };
b1fbf5c3 282like($@, qr/no method found/);
8ebc5c01
PP
283
284# Check AUTOLOADING:
285
286*Oscalar::AUTOLOAD =
287 sub { *{"Oscalar::$AUTOLOAD"} = sub {"_!_" . shift() . "_!_"} ;
288 goto &{"Oscalar::$AUTOLOAD"}};
289
44a8e56a 290eval "package Oscalar; sub comple; use overload '~' => 'comple'";
8ebc5c01
PP
291
292$na = eval { ~$a }; # Hash was not updated
b1fbf5c3 293like($@, qr/no method found/);
8ebc5c01
PP
294
295bless \$x, Oscalar;
296
297$na = eval { ~$a }; # Hash updated
44a8e56a 298warn "`$na', $@" if $@;
b1fbf5c3
NC
299ok !$@;
300is($na, '_!_xx_!_');
8ebc5c01
PP
301
302$na = 0;
303
304$na = eval { ~$aI }; # Hash was not updated
fdb7e2a2 305like($@, qr/no method found/);
8ebc5c01
PP
306
307bless \$x, OscalarI;
308
309$na = eval { ~$aI };
310print $@;
311
fdb7e2a2
NC
312ok(!$@);
313is($na, '_!_xx_!_');
8ebc5c01 314
44a8e56a 315eval "package Oscalar; sub rshft; use overload '>>' => 'rshft'";
8ebc5c01
PP
316
317$na = eval { $aI >> 1 }; # Hash was not updated
fdb7e2a2 318like($@, qr/no method found/);
8ebc5c01
PP
319
320bless \$x, OscalarI;
321
322$na = 0;
323
324$na = eval { $aI >> 1 };
325print $@;
326
fdb7e2a2
NC
327ok(!$@);
328is($na, '_!_xx_!_');
8ebc5c01 329
44a8e56a 330# warn overload::Method($a, '0+'), "\n";
fdb7e2a2
NC
331is(overload::Method($a, '0+'), \&Oscalar::numify);
332is(overload::Method($aI,'0+'), \&Oscalar::numify);
333ok(overload::Overloaded($aI));
334ok(!overload::Overloaded('overload'));
8ebc5c01 335
fdb7e2a2
NC
336ok(! defined overload::Method($aI, '<<'));
337ok(! defined overload::Method($a, '<'));
8ebc5c01 338
fdb7e2a2
NC
339like (overload::StrVal($aI), qr/^OscalarI=SCALAR\(0x[\da-fA-F]+\)$/);
340is(overload::StrVal(\$aI), "@{[\$aI]}");
8ebc5c01 341
44a8e56a
PP
342# Check overloading by methods (specified deep in the ISA tree).
343{
344 package OscalarII;
345 @ISA = 'OscalarI';
346 sub Oscalar::lshft {"_<<_" . shift() . "_<<_"}
347 eval "package OscalarI; use overload '<<' => 'lshft', '|' => 'lshft'";
348}
349
350$aaII = "087";
351$aII = \$aaII;
352bless $aII, 'OscalarII';
353bless \$fake, 'OscalarI'; # update the hash
fdb7e2a2 354is(($aI | 3), '_<<_xx_<<_');
44a8e56a 355# warn $aII << 3;
fdb7e2a2 356is(($aII << 3), '_<<_087_<<_');
44a8e56a 357
b3ac6de7
IZ
358{
359 BEGIN { $int = 7; overload::constant 'integer' => sub {$int++; shift}; }
360 $out = 2**10;
361}
fdb7e2a2
NC
362is($int, 9);
363is($out, 1024);
b3ac6de7
IZ
364
365$foo = 'foo';
366$foo1 = 'f\'o\\o';
367{
368 BEGIN { $q = $qr = 7;
369 overload::constant 'q' => sub {$q++; push @q, shift, ($_[1] || 'none'); shift},
370 'qr' => sub {$qr++; push @qr, shift, ($_[1] || 'none'); shift}; }
371 $out = 'foo';
372 $out1 = 'f\'o\\o';
373 $out2 = "a\a$foo,\,";
374 /b\b$foo.\./;
375}
376
fdb7e2a2
NC
377is($out, 'foo');
378is($out, $foo);
379is($out1, 'f\'o\\o');
380is($out1, $foo1);
381is($out2, "a\afoo,\,");
382is("@q", "foo q f'o\\\\o q a\\a qq ,\\, qq");
383is($q, 11);
384is("@qr", "b\\b qq .\\. qq");
385is($qr, 9);
b3ac6de7
IZ
386
387{
388 $_ = '!<b>!foo!<-.>!';
389 BEGIN { overload::constant 'q' => sub {push @q1, shift, ($_[1] || 'none'); "_<" . (shift) . ">_"},
390 'qr' => sub {push @qr1, shift, ($_[1] || 'none'); "!<" . (shift) . ">!"}; }
391 $out = 'foo';
392 $out1 = 'f\'o\\o';
393 $out2 = "a\a$foo,\,";
394 $res = /b\b$foo.\./;
395 $a = <<EOF;
396oups
397EOF
398 $b = <<'EOF';
399oups1
400EOF
401 $c = bareword;
402 m'try it';
403 s'first part'second part';
404 s/yet another/tail here/;
c2e66d9e 405 tr/A-Z/a-z/;
b3ac6de7
IZ
406}
407
fdb7e2a2
NC
408is($out, '_<foo>_');
409is($out1, '_<f\'o\\o>_');
410is($out2, "_<a\a>_foo_<,\,>_");
411is("@q1", "foo q f'o\\\\o q a\\a qq ,\\, qq oups
b3ac6de7 412 qq oups1
fdb7e2a2
NC
413 q second part q tail here s A-Z tr a-z tr");
414is("@qr1", "b\\b qq .\\. qq try it q first part q yet another qq");
415is($res, 1);
416is($a, "_<oups
417>_");
418is($b, "_<oups1
419>_");
420is($c, "bareword");
b3ac6de7 421
ee239bfe
IZ
422{
423 package symbolic; # Primitive symbolic calculator
424 use overload nomethod => \&wrap, '""' => \&str, '0+' => \&num,
425 '=' => \&cpy, '++' => \&inc, '--' => \&dec;
426
427 sub new { shift; bless ['n', @_] }
428 sub cpy {
429 my $self = shift;
430 bless [@$self], ref $self;
431 }
432 sub inc { $_[0] = bless ['++', $_[0], 1]; }
433 sub dec { $_[0] = bless ['--', $_[0], 1]; }
434 sub wrap {
435 my ($obj, $other, $inv, $meth) = @_;
436 if ($meth eq '++' or $meth eq '--') {
437 @$obj = ($meth, (bless [@$obj]), 1); # Avoid circular reference
438 return $obj;
439 }
440 ($obj, $other) = ($other, $obj) if $inv;
441 bless [$meth, $obj, $other];
442 }
443 sub str {
444 my ($meth, $a, $b) = @{+shift};
445 $a = 'u' unless defined $a;
446 if (defined $b) {
447 "[$meth $a $b]";
448 } else {
449 "[$meth $a]";
450 }
451 }
452 my %subr = ( 'n' => sub {$_[0]} );
453 foreach my $op (split " ", $overload::ops{with_assign}) {
454 $subr{$op} = $subr{"$op="} = eval "sub {shift() $op shift()}";
455 }
456 my @bins = qw(binary 3way_comparison num_comparison str_comparison);
457 foreach my $op (split " ", "@overload::ops{ @bins }") {
458 $subr{$op} = eval "sub {shift() $op shift()}";
459 }
460 foreach my $op (split " ", "@overload::ops{qw(unary func)}") {
461 $subr{$op} = eval "sub {$op shift()}";
462 }
463 $subr{'++'} = $subr{'+'};
464 $subr{'--'} = $subr{'-'};
465
466 sub num {
467 my ($meth, $a, $b) = @{+shift};
468 my $subr = $subr{$meth}
469 or die "Do not know how to ($meth) in symbolic";
470 $a = $a->num if ref $a eq __PACKAGE__;
471 $b = $b->num if ref $b eq __PACKAGE__;
472 $subr->($a,$b);
473 }
474 sub TIESCALAR { my $pack = shift; $pack->new(@_) }
475 sub FETCH { shift }
476 sub nop { } # Around a bug
477 sub vars { my $p = shift; tie($_, $p), $_->nop foreach @_; }
478 sub STORE {
479 my $obj = shift;
480 $#$obj = 1;
a1063b2d 481 $obj->[1] = shift;
ee239bfe
IZ
482 }
483}
484
485{
486 my $foo = new symbolic 11;
487 my $baz = $foo++;
fdb7e2a2
NC
488 is((sprintf "%d", $foo), '12');
489 is((sprintf "%d", $baz), '11');
ee239bfe
IZ
490 my $bar = $foo;
491 $baz = ++$foo;
fdb7e2a2
NC
492 is((sprintf "%d", $foo), '13');
493 is((sprintf "%d", $bar), '12');
494 is((sprintf "%d", $baz), '13');
ee239bfe
IZ
495 my $ban = $foo;
496 $baz = ($foo += 1);
fdb7e2a2
NC
497 is((sprintf "%d", $foo), '14');
498 is((sprintf "%d", $bar), '12');
499 is((sprintf "%d", $baz), '14');
500 is((sprintf "%d", $ban), '13');
ee239bfe
IZ
501 $baz = 0;
502 $baz = $foo++;
fdb7e2a2
NC
503 is((sprintf "%d", $foo), '15');
504 is((sprintf "%d", $baz), '14');
505 is("$foo", '[++ [+= [++ [++ [n 11] 1] 1] 1] 1]');
ee239bfe
IZ
506}
507
508{
509 my $iter = new symbolic 2;
510 my $side = new symbolic 1;
511 my $cnt = $iter;
512
513 while ($cnt) {
514 $cnt = $cnt - 1; # The "simple" way
515 $side = (sqrt(1 + $side**2) - 1)/$side;
516 }
517 my $pi = $side*(2**($iter+2));
fdb7e2a2
NC
518 is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
519 is((sprintf "%f", $pi), '3.182598');
ee239bfe
IZ
520}
521
522{
523 my $iter = new symbolic 2;
524 my $side = new symbolic 1;
525 my $cnt = $iter;
526
527 while ($cnt--) {
528 $side = (sqrt(1 + $side**2) - 1)/$side;
529 }
530 my $pi = $side*(2**($iter+2));
fdb7e2a2
NC
531 is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
532 is((sprintf "%f", $pi), '3.182598');
ee239bfe
IZ
533}
534
535{
536 my ($a, $b);
537 symbolic->vars($a, $b);
538 my $c = sqrt($a**2 + $b**2);
539 $a = 3; $b = 4;
fdb7e2a2 540 is((sprintf "%d", $c), '5');
ee239bfe 541 $a = 12; $b = 5;
fdb7e2a2 542 is((sprintf "%d", $c), '13');
ee239bfe
IZ
543}
544
545{
546 package symbolic1; # Primitive symbolic calculator
547 # Mutator inc/dec
548 use overload nomethod => \&wrap, '""' => \&str, '0+' => \&num, '=' => \&cpy;
549
550 sub new { shift; bless ['n', @_] }
551 sub cpy {
552 my $self = shift;
553 bless [@$self], ref $self;
554 }
555 sub wrap {
556 my ($obj, $other, $inv, $meth) = @_;
557 if ($meth eq '++' or $meth eq '--') {
558 @$obj = ($meth, (bless [@$obj]), 1); # Avoid circular reference
559 return $obj;
560 }
561 ($obj, $other) = ($other, $obj) if $inv;
562 bless [$meth, $obj, $other];
563 }
564 sub str {
565 my ($meth, $a, $b) = @{+shift};
566 $a = 'u' unless defined $a;
567 if (defined $b) {
568 "[$meth $a $b]";
569 } else {
570 "[$meth $a]";
571 }
572 }
573 my %subr = ( 'n' => sub {$_[0]} );
574 foreach my $op (split " ", $overload::ops{with_assign}) {
575 $subr{$op} = $subr{"$op="} = eval "sub {shift() $op shift()}";
576 }
577 my @bins = qw(binary 3way_comparison num_comparison str_comparison);
578 foreach my $op (split " ", "@overload::ops{ @bins }") {
579 $subr{$op} = eval "sub {shift() $op shift()}";
580 }
581 foreach my $op (split " ", "@overload::ops{qw(unary func)}") {
582 $subr{$op} = eval "sub {$op shift()}";
583 }
584 $subr{'++'} = $subr{'+'};
585 $subr{'--'} = $subr{'-'};
586
587 sub num {
588 my ($meth, $a, $b) = @{+shift};
589 my $subr = $subr{$meth}
590 or die "Do not know how to ($meth) in symbolic";
591 $a = $a->num if ref $a eq __PACKAGE__;
592 $b = $b->num if ref $b eq __PACKAGE__;
593 $subr->($a,$b);
594 }
595 sub TIESCALAR { my $pack = shift; $pack->new(@_) }
596 sub FETCH { shift }
597 sub nop { } # Around a bug
598 sub vars { my $p = shift; tie($_, $p), $_->nop foreach @_; }
599 sub STORE {
600 my $obj = shift;
601 $#$obj = 1;
a1063b2d 602 $obj->[1] = shift;
ee239bfe
IZ
603 }
604}
605
606{
607 my $foo = new symbolic1 11;
608 my $baz = $foo++;
fdb7e2a2
NC
609 is((sprintf "%d", $foo), '12');
610 is((sprintf "%d", $baz), '11');
ee239bfe
IZ
611 my $bar = $foo;
612 $baz = ++$foo;
fdb7e2a2
NC
613 is((sprintf "%d", $foo), '13');
614 is((sprintf "%d", $bar), '12');
615 is((sprintf "%d", $baz), '13');
ee239bfe
IZ
616 my $ban = $foo;
617 $baz = ($foo += 1);
fdb7e2a2
NC
618 is((sprintf "%d", $foo), '14');
619 is((sprintf "%d", $bar), '12');
620 is((sprintf "%d", $baz), '14');
621 is((sprintf "%d", $ban), '13');
ee239bfe
IZ
622 $baz = 0;
623 $baz = $foo++;
fdb7e2a2
NC
624 is((sprintf "%d", $foo), '15');
625 is((sprintf "%d", $baz), '14');
626 is("$foo", '[++ [+= [++ [++ [n 11] 1] 1] 1] 1]');
ee239bfe
IZ
627}
628
629{
630 my $iter = new symbolic1 2;
631 my $side = new symbolic1 1;
632 my $cnt = $iter;
633
634 while ($cnt) {
635 $cnt = $cnt - 1; # The "simple" way
636 $side = (sqrt(1 + $side**2) - 1)/$side;
637 }
638 my $pi = $side*(2**($iter+2));
fdb7e2a2
NC
639 is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
640 is((sprintf "%f", $pi), '3.182598');
ee239bfe
IZ
641}
642
643{
644 my $iter = new symbolic1 2;
645 my $side = new symbolic1 1;
646 my $cnt = $iter;
647
648 while ($cnt--) {
649 $side = (sqrt(1 + $side**2) - 1)/$side;
650 }
651 my $pi = $side*(2**($iter+2));
fdb7e2a2
NC
652 is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
653 is((sprintf "%f", $pi), '3.182598');
ee239bfe
IZ
654}
655
656{
657 my ($a, $b);
658 symbolic1->vars($a, $b);
659 my $c = sqrt($a**2 + $b**2);
660 $a = 3; $b = 4;
fdb7e2a2 661 is((sprintf "%d", $c), '5');
ee239bfe 662 $a = 12; $b = 5;
fdb7e2a2 663 is((sprintf "%d", $c), '13');
ee239bfe
IZ
664}
665
666{
667 package two_face; # Scalars with separate string and
668 # numeric values.
669 sub new { my $p = shift; bless [@_], $p }
670 use overload '""' => \&str, '0+' => \&num, fallback => 1;
671 sub num {shift->[1]}
672 sub str {shift->[0]}
673}
674
675{
676 my $seven = new two_face ("vii", 7);
fdb7e2a2 677 is((sprintf "seven=$seven, seven=%d, eight=%d", $seven, $seven+1),
ee239bfe 678 'seven=vii, seven=7, eight=8');
fdb7e2a2 679 is(scalar ($seven =~ /i/), '1');
ee239bfe 680}
b3ac6de7 681
d0ecd44c
IZ
682{
683 package sorting;
684 use overload 'cmp' => \&comp;
685 sub new { my ($p, $v) = @_; bless \$v, $p }
686 sub comp { my ($x,$y) = @_; ($$x * 3 % 10) <=> ($$y * 3 % 10) or $$x cmp $$y }
687}
688{
689 my @arr = map sorting->new($_), 0..12;
690 my @sorted1 = sort @arr;
691 my @sorted2 = map $$_, @sorted1;
7bf00c86 692 is("@sorted2", '0 10 7 4 1 11 8 5 12 2 9 6 3');
d0ecd44c 693}
f5284f61
IZ
694{
695 package iterator;
696 use overload '<>' => \&iter;
697 sub new { my ($p, $v) = @_; bless \$v, $p }
698 sub iter { my ($x) = @_; return undef if $$x < 0; return $$x--; }
699}
72b16652
GS
700
701# XXX iterator overload not intended to work with CORE::GLOBAL?
702if (defined &CORE::GLOBAL::glob) {
7bf00c86
NC
703 is('1', '1');
704 is('1', '1');
705 is('1', '1');
72b16652
GS
706}
707else {
f5284f61
IZ
708 my $iter = iterator->new(5);
709 my $acc = '';
710 my $out;
711 $acc .= " $out" while $out = <${iter}>;
7bf00c86 712 is($acc, ' 5 4 3 2 1 0');
f5284f61 713 $iter = iterator->new(5);
7bf00c86 714 is(scalar <${iter}>, '5');
f5284f61 715 $acc = '';
b04ef359 716 $acc .= " $out" while $out = <$iter>;
7bf00c86 717 is($acc, ' 4 3 2 1 0');
f5284f61
IZ
718}
719{
720 package deref;
721 use overload '%{}' => \&hderef, '&{}' => \&cderef,
722 '*{}' => \&gderef, '${}' => \&sderef, '@{}' => \&aderef;
723 sub new { my ($p, $v) = @_; bless \$v, $p }
724 sub deref {
725 my ($self, $key) = (shift, shift);
726 my $class = ref $self;
727 bless $self, 'deref::dummy'; # Disable overloading of %{}
728 my $out = $self->{$key};
729 bless $self, $class; # Restore overloading
730 $out;
731 }
732 sub hderef {shift->deref('h')}
733 sub aderef {shift->deref('a')}
734 sub cderef {shift->deref('c')}
735 sub gderef {shift->deref('g')}
736 sub sderef {shift->deref('s')}
737}
738{
739 my $deref = bless { h => { foo => 5 , fake => 23 },
740 c => sub {return shift() + 34},
741 's' => \123,
742 a => [11..13],
743 g => \*srt,
744 }, 'deref';
745 # Hash:
746 my @cont = sort %$deref;
b0bf6df7 747 if ("\t" eq "\011") { # ASCII
7bf00c86 748 is("@cont", '23 5 fake foo');
f70c35af 749 }
b0bf6df7 750 else { # EBCDIC alpha-numeric sort order
7bf00c86 751 is("@cont", 'fake foo 23 5');
f70c35af 752 }
f5284f61 753 my @keys = sort keys %$deref;
7bf00c86 754 is("@keys", 'fake foo');
f5284f61 755 my @val = sort values %$deref;
7bf00c86
NC
756 is("@val", '23 5');
757 is($deref->{foo}, 5);
758 is(defined $deref->{bar}, '');
f5284f61
IZ
759 my $key;
760 @keys = ();
761 push @keys, $key while $key = each %$deref;
762 @keys = sort @keys;
7bf00c86
NC
763 is("@keys", 'fake foo');
764 is(exists $deref->{bar}, '');
765 is(exists $deref->{foo}, 1);
f5284f61 766 # Code:
7bf00c86
NC
767 is($deref->(5), 39);
768 is(&$deref(6), 40);
f5284f61 769 sub xxx_goto { goto &$deref }
7bf00c86 770 is(xxx_goto(7), 41);
f5284f61
IZ
771 my $srt = bless { c => sub {$b <=> $a}
772 }, 'deref';
773 *srt = \&$srt;
774 my @sorted = sort srt 11, 2, 5, 1, 22;
7bf00c86 775 is("@sorted", '22 11 5 2 1');
f5284f61 776 # Scalar
7bf00c86 777 is($$deref, 123);
c6e96bcb
GS
778 # Code
779 @sorted = sort $srt 11, 2, 5, 1, 22;
7bf00c86 780 is("@sorted", '22 11 5 2 1');
f5284f61 781 # Array
7bf00c86
NC
782 is("@$deref", '11 12 13');
783 is($#$deref, '2');
f5284f61 784 my $l = @$deref;
7bf00c86
NC
785 is($l, 3);
786 is($deref->[2], '13');
f5284f61 787 $l = pop @$deref;
7bf00c86 788 is($l, 13);
f5284f61 789 $l = 1;
7bf00c86 790 is($deref->[$l], '12');
f5284f61
IZ
791 # Repeated dereference
792 my $double = bless { h => $deref,
793 }, 'deref';
7bf00c86 794 is($double->{foo}, 5);
f5284f61
IZ
795}
796
797{
798 package two_refs;
799 use overload '%{}' => \&gethash, '@{}' => sub { ${shift()} };
800 sub new {
801 my $p = shift;
802 bless \ [@_], $p;
803 }
804 sub gethash {
805 my %h;
806 my $self = shift;
807 tie %h, ref $self, $self;
808 \%h;
809 }
810
811 sub TIEHASH { my $p = shift; bless \ shift, $p }
812 my %fields;
813 my $i = 0;
814 $fields{$_} = $i++ foreach qw{zero one two three};
815 sub STORE {
816 my $self = ${shift()};
817 my $key = $fields{shift()};
818 defined $key or die "Out of band access";
819 $$self->[$key] = shift;
820 }
821 sub FETCH {
822 my $self = ${shift()};
823 my $key = $fields{shift()};
824 defined $key or die "Out of band access";
825 $$self->[$key];
826 }
827}
828
829my $bar = new two_refs 3,4,5,6;
830$bar->[2] = 11;
7bf00c86 831is($bar->{two}, 11);
f5284f61 832$bar->{three} = 13;
7bf00c86 833is($bar->[3], 13);
f5284f61
IZ
834
835{
836 package two_refs_o;
837 @ISA = ('two_refs');
838}
839
840$bar = new two_refs_o 3,4,5,6;
841$bar->[2] = 11;
7bf00c86 842is($bar->{two}, 11);
f5284f61 843$bar->{three} = 13;
7bf00c86 844is($bar->[3], 13);
f5284f61
IZ
845
846{
847 package two_refs1;
848 use overload '%{}' => sub { ${shift()}->[1] },
849 '@{}' => sub { ${shift()}->[0] };
850 sub new {
851 my $p = shift;
852 my $a = [@_];
853 my %h;
854 tie %h, $p, $a;
855 bless \ [$a, \%h], $p;
856 }
857 sub gethash {
858 my %h;
859 my $self = shift;
860 tie %h, ref $self, $self;
861 \%h;
862 }
863
864 sub TIEHASH { my $p = shift; bless \ shift, $p }
865 my %fields;
866 my $i = 0;
867 $fields{$_} = $i++ foreach qw{zero one two three};
868 sub STORE {
869 my $a = ${shift()};
870 my $key = $fields{shift()};
871 defined $key or die "Out of band access";
872 $a->[$key] = shift;
873 }
874 sub FETCH {
875 my $a = ${shift()};
876 my $key = $fields{shift()};
877 defined $key or die "Out of band access";
878 $a->[$key];
879 }
880}
881
882$bar = new two_refs_o 3,4,5,6;
883$bar->[2] = 11;
7bf00c86 884is($bar->{two}, 11);
f5284f61 885$bar->{three} = 13;
7bf00c86 886is($bar->[3], 13);
f5284f61
IZ
887
888{
889 package two_refs1_o;
890 @ISA = ('two_refs1');
891}
892
893$bar = new two_refs1_o 3,4,5,6;
894$bar->[2] = 11;
7bf00c86 895is($bar->{two}, 11);
f5284f61 896$bar->{three} = 13;
7bf00c86 897is($bar->[3], 13);
f5284f61 898
fe7ac86a
IZ
899{
900 package B;
901 use overload bool => sub { ${+shift} };
902}
903
904my $aaa;
905{ my $bbbb = 0; $aaa = bless \$bbbb, B }
906
7bf00c86 907is !$aaa, 1;
fe7ac86a
IZ
908
909unless ($aaa) {
7bf00c86 910 pass();
fe7ac86a 911} else {
7bf00c86 912 fail();
fe7ac86a
IZ
913}
914
1426bbf4
MG
915# check that overload isn't done twice by join
916{ my $c = 0;
917 package Join;
918 use overload '""' => sub { $c++ };
919 my $x = join '', bless([]), 'pq', bless([]);
7bf00c86 920 main::is $x, '0pq1';
1426bbf4 921};
fe7ac86a 922
4498a751
PM
923# Test module-specific warning
924{
925 # check the Odd number of arguments for overload::constant warning
926 my $a = "" ;
0a911d86 927 local $SIG{__WARN__} = sub {$a = $_[0]} ;
4498a751 928 $x = eval ' overload::constant "integer" ; ' ;
7bf00c86 929 is($a, "");
4498a751
PM
930 use warnings 'overload' ;
931 $x = eval ' overload::constant "integer" ; ' ;
7bf00c86 932 like($a, qr/^Odd number of arguments for overload::constant at/);
4498a751
PM
933}
934
935{
936 # check the `$_[0]' is not an overloadable type warning
937 my $a = "" ;
0a911d86 938 local $SIG{__WARN__} = sub {$a = $_[0]} ;
4498a751 939 $x = eval ' overload::constant "fred" => sub {} ; ' ;
7bf00c86 940 is($a, "");
4498a751
PM
941 use warnings 'overload' ;
942 $x = eval ' overload::constant "fred" => sub {} ; ' ;
7bf00c86 943 like($a, qr/^`fred' is not an overloadable type at/);
4498a751
PM
944}
945
946{
947 # check the `$_[1]' is not a code reference warning
948 my $a = "" ;
0a911d86 949 local $SIG{__WARN__} = sub {$a = $_[0]} ;
4498a751 950 $x = eval ' overload::constant "integer" => 1; ' ;
7bf00c86 951 is($a, "");
4498a751
PM
952 use warnings 'overload' ;
953 $x = eval ' overload::constant "integer" => 1; ' ;
7bf00c86 954 like($a, qr/^`1' is not a code reference at/);
4498a751
PM
955}
956
78f67eb5
JH
957{
958 my $c = 0;
959 package ov_int1;
960 use overload '""' => sub { 3+shift->[0] },
961 '0+' => sub { 10+shift->[0] },
962 'int' => sub { 100+shift->[0] };
963 sub new {my $p = shift; bless [shift], $p}
964
965 package ov_int2;
966 use overload '""' => sub { 5+shift->[0] },
967 '0+' => sub { 30+shift->[0] },
968 'int' => sub { 'ov_int1'->new(1000+shift->[0]) };
969 sub new {my $p = shift; bless [shift], $p}
970
971 package noov_int;
972 use overload '""' => sub { 2+shift->[0] },
973 '0+' => sub { 9+shift->[0] };
974 sub new {my $p = shift; bless [shift], $p}
975
976 package main;
977
978 my $x = new noov_int 11;
979 my $int_x = int $x;
7bf00c86 980 main::is("$int_x", 20);
78f67eb5
JH
981 $x = new ov_int1 31;
982 $int_x = int $x;
7bf00c86 983 main::is("$int_x", 131);
78f67eb5
JH
984 $x = new ov_int2 51;
985 $int_x = int $x;
7bf00c86 986 main::is("$int_x", 1054);
78f67eb5
JH
987}
988
b0bf6df7 989# make sure that we don't infinitely recurse
1554e226
DC
990{
991 my $c = 0;
992 package Recurse;
993 use overload '""' => sub { shift },
994 '0+' => sub { shift },
995 'bool' => sub { shift },
996 fallback => 1;
997 my $x = bless([]);
7bf00c86
NC
998 # For some reason beyond me these have to be oks rather than likes.
999 main::ok("$x" =~ /Recurse=ARRAY/);
1000 main::ok($x);
1001 main::ok($x+0 =~ qr/Recurse=ARRAY/);
11e3e2e4 1002}
78f67eb5 1003
1dc13c17
SC
1004# BugID 20010422.003
1005package Foo;
1006
1007use overload
1008 'bool' => sub { return !$_[0]->is_zero() || undef; }
1009;
1010
1011sub is_zero
1012 {
1013 my $self = shift;
1014 return $self->{var} == 0;
1015 }
1016
1017sub new
1018 {
1019 my $class = shift;
1020 my $self = {};
1021 $self->{var} = shift;
1022 bless $self,$class;
1023 }
1024
1025package main;
1026
1027use strict;
1028
1029my $r = Foo->new(8);
1030$r = Foo->new(0);
78f67eb5 1031
11e3e2e4 1032is(($r || 0), 0);
1554e226 1033
6050d10e
JP
1034package utf8_o;
1035
1036use overload
1037 '""' => sub { return $_[0]->{var}; }
1038 ;
1039
1040sub new
1041 {
1042 my $class = shift;
1043 my $self = {};
1044 $self->{var} = shift;
1045 bless $self,$class;
1046 }
1047
1048package main;
1049
1050
1051my $utfvar = new utf8_o 200.2.1;
11e3e2e4
NC
1052is("$utfvar", 200.2.1); # 223 - stringify
1053is("a$utfvar", "a".200.2.1); # 224 - overload via sv_2pv_flags
6050d10e 1054
446eaa42 1055# 225..227 -- more %{} tests. Hangs in 5.6.0, okay in later releases.
41cb1005
JH
1056# Basically this example implements strong encapsulation: if Hderef::import()
1057# were to eval the overload code in the caller's namespace, the privatisation
1058# would be quite transparent.
1059package Hderef;
1060use overload '%{}' => sub { (caller(0))[0] eq 'Foo' ? $_[0] : die "zap" };
1061package Foo;
1062@Foo::ISA = 'Hderef';
1063sub new { bless {}, shift }
1064sub xet { @_ == 2 ? $_[0]->{$_[1]} :
1065 @_ == 3 ? ($_[0]->{$_[1]} = $_[2]) : undef }
1066package main;
1067my $a = Foo->new;
1068$a->xet('b', 42);
11e3e2e4
NC
1069is ($a->xet('b'), 42);
1070ok (!defined eval { $a->{b} });
1071like ($@, qr/zap/);
41cb1005 1072
29ddfe35
RD
1073{
1074 package t229;
1075 use overload '=' => sub { 42 },
1076 '++' => sub { my $x = ${$_[0]}; $_[0] };
1077 sub new { my $x = 42; bless \$x }
1078
1079 my $warn;
1080 {
1081 local $SIG{__WARN__} = sub { $warn++ };
1082 my $x = t229->new;
1083 my $y = $x;
1084 eval { $y++ };
1085 }
11e3e2e4 1086 main::ok (!$warn);
61f33854
RGS
1087}
1088
1089{
1090 my ($int, $out1, $out2);
1091 {
1092 BEGIN { $int = 0; overload::constant 'integer' => sub {$int++; 17}; }
1093 $out1 = 0;
1094 $out2 = 1;
1095 }
11e3e2e4
NC
1096 is($int, 2, "#24313"); # 230
1097 is($out1, 17, "#24313"); # 231
1098 is($out2, 17, "#24313"); # 232
29ddfe35
RD
1099}
1100
0bdaccee
NC
1101{
1102 package Numify;
1103 use overload (qw(0+ numify fallback 1));
1104
1105 sub new {
1106 my $val = $_[1];
1107 bless \$val, $_[0];
1108 }
1109
1110 sub numify { ${$_[0]} }
1111}
1112
d411a6a9
RD
1113{
1114 package perl31793;
1b1d102f
RD
1115 use overload cmp => sub { 0 };
1116 package perl31793_fb;
76c43448 1117 use overload cmp => sub { 0 }, fallback => 1;
d411a6a9
RD
1118 package main;
1119 my $o = bless [], 'perl31793';
1b1d102f 1120 my $of = bless [], 'perl31793_fb';
d411a6a9 1121 my $no = bless [], 'no_overload';
11e3e2e4
NC
1122 like(overload::StrVal(\"scalar"), qr/^SCALAR\(0x[0-9a-f]+\)$/);
1123 like(overload::StrVal([]), qr/^ARRAY\(0x[0-9a-f]+\)$/);
1124 like(overload::StrVal({}), qr/^HASH\(0x[0-9a-f]+\)$/);
1125 like(overload::StrVal(sub{1}), qr/^CODE\(0x[0-9a-f]+\)$/);
1126 like(overload::StrVal(\*GLOB), qr/^GLOB\(0x[0-9a-f]+\)$/);
1127 like(overload::StrVal(\$o), qr/^REF\(0x[0-9a-f]+\)$/);
0fc92fc6 1128 like(overload::StrVal(qr/a/), qr/^Regexp=REGEXP\(0x[0-9a-f]+\)$/);
11e3e2e4
NC
1129 like(overload::StrVal($o), qr/^perl31793=ARRAY\(0x[0-9a-f]+\)$/);
1130 like(overload::StrVal($of), qr/^perl31793_fb=ARRAY\(0x[0-9a-f]+\)$/);
1131 like(overload::StrVal($no), qr/^no_overload=ARRAY\(0x[0-9a-f]+\)$/);
d411a6a9
RD
1132}
1133
b0bf6df7 1134# These are all check that overloaded values rather than reference addresses
0bdaccee
NC
1135# are what is getting tested.
1136my ($two, $one, $un, $deux) = map {new Numify $_} 2, 1, 1, 2;
1137my ($ein, $zwei) = (1, 2);
1138
1139my %map = (one => 1, un => 1, ein => 1, deux => 2, two => 2, zwei => 2);
1140foreach my $op (qw(<=> == != < <= > >=)) {
1141 foreach my $l (keys %map) {
1142 foreach my $r (keys %map) {
1143 my $ocode = "\$$l $op \$$r";
1144 my $rcode = "$map{$l} $op $map{$r}";
1145
1146 my $got = eval $ocode;
1147 die if $@;
1148 my $expect = eval $rcode;
1149 die if $@;
11e3e2e4 1150 is ($got, $expect, $ocode) or print "# $rcode\n";
0bdaccee
NC
1151 }
1152 }
1153}
131b3ad0
DM
1154{
1155 # check that overloading works in regexes
1156 {
1157 package Foo493;
1158 use overload
1159 '""' => sub { "^$_[0][0]\$" },
1160 '.' => sub {
1161 bless [
1162 $_[2]
1163 ? (ref $_[1] ? $_[1][0] : $_[1]) . ':' .$_[0][0]
1164 : $_[0][0] . ':' . (ref $_[1] ? $_[1][0] : $_[1])
1165 ], 'Foo493'
1166 };
1167 }
1168
1169 my $a = bless [ "a" ], 'Foo493';
11e3e2e4
NC
1170 like('a', qr/$a/);
1171 like('x:a', qr/x$a/);
1172 like('x:a:=', qr/x$a=$/);
1173 like('x:a:a:=', qr/x$a$a=$/);
131b3ad0
DM
1174
1175}
1176
705c898c
RH
1177{
1178 my $twenty_three = 23;
1179 # Check that constant overloading propagates into evals
1180 BEGIN { overload::constant integer => sub { 23 } }
11e3e2e4 1181 is(eval "17", $twenty_three);
705c898c 1182}
dd2eae66
NC
1183
1184{
1185 package Sklorsh;
1186 use overload
1187 bool => sub { shift->is_cool };
1188
1189 sub is_cool {
1190 $_[0]->{name} eq 'cool';
1191 }
1192
1193 sub delete {
1194 undef %{$_[0]};
1195 bless $_[0], 'Brap';
1196 return 1;
1197 }
1198
1199 sub delete_with_self {
1200 my $self = shift;
1201 undef %$self;
1202 bless $self, 'Brap';
1203 return 1;
1204 }
1205
1206 package Brap;
1207
1208 1;
1209
1210 package main;
1211
1212 my $obj;
1213 $obj = bless {name => 'cool'}, 'Sklorsh';
1214 $obj->delete;
b0bf6df7 1215 ok(eval {if ($obj) {1}; 1}, $@ || 'reblessed into nonexistent namespace');
dd2eae66
NC
1216
1217 $obj = bless {name => 'cool'}, 'Sklorsh';
1218 $obj->delete_with_self;
1219 ok (eval {if ($obj) {1}; 1}, $@);
1220
1221 my $a = $b = {name => 'hot'};
1222 bless $b, 'Sklorsh';
1223 is(ref $a, 'Sklorsh');
1224 is(ref $b, 'Sklorsh');
1225 ok(!$b, "Expect overloaded boolean");
1226 ok(!$a, "Expect overloaded boolean");
1227}
2372186a
NC
1228{
1229 use Scalar::Util 'weaken';
1230
1231 package Shklitza;
1232 use overload '""' => sub {"CLiK KLAK"};
1233
1234 package Ksshfwoom;
2372186a
NC
1235
1236 package main;
1237
1238 my ($obj, $ref);
1239 $obj = bless do {my $a; \$a}, 'Shklitza';
1240 $ref = $obj;
1241
1242 is ($obj, "CLiK KLAK");
1243 is ($ref, "CLiK KLAK");
1244
1245 weaken $ref;
1246 is ($ref, "CLiK KLAK");
1247
1248 bless $obj, 'Ksshfwoom';
1249
cd75d542
NC
1250 like ($obj, qr/^Ksshfwoom=/);
1251 like ($ref, qr/^Ksshfwoom=/);
2372186a
NC
1252
1253 undef $obj;
1254 is ($ref, undef);
1255}
6dd85743
AF
1256
1257{
1258 package bit;
1259 # bit operations have overloadable assignment variants too
1260
1261 sub new { bless \$_[1], $_[0] }
1262
1263 use overload
1264 "&=" => sub { bit->new($_[0]->val . ' & ' . $_[1]->val) },
1265 "^=" => sub { bit->new($_[0]->val . ' ^ ' . $_[1]->val) },
1266 "|" => sub { bit->new($_[0]->val . ' | ' . $_[1]->val) }, # |= by fallback
1267 ;
1268
1269 sub val { ${$_[0]} }
1270
1271 package main;
1272
1273 my $a = bit->new(my $va = 'a');
1274 my $b = bit->new(my $vb = 'b');
1275
1276 $a &= $b;
1277 is($a->val, 'a & b', "overloaded &= works");
1278
1279 my $c = bit->new(my $vc = 'c');
1280
1281 $b ^= $c;
1282 is($b->val, 'b ^ c', "overloaded ^= works");
1283
1284 my $d = bit->new(my $vd = 'd');
1285
1286 $c |= $d;
1287 is($c->val, 'c | d', "overloaded |= (by fallback) works");
1288}
d11ee47c
RD
1289
1290{
1291 # comparison operators with nomethod
1292 my $warning = "";
1293 my $method;
1294
1295 package nomethod_false;
1296 use overload nomethod => sub { $method = 'nomethod'; 0 };
1297
1298 package nomethod_true;
1299 use overload nomethod => sub { $method= 'nomethod'; 'true' };
1300
1301 package main;
1302 local $^W = 1;
1303 local $SIG{__WARN__} = sub { $warning = $_[0] };
1304
1305 my $f = bless [], 'nomethod_false';
1306 ($warning, $method) = ("", "");
1307 is($f eq 'whatever', 0, 'nomethod makes eq return 0');
1308 is($method, 'nomethod');
1309
1310 my $t = bless [], 'nomethod_true';
1311 ($warning, $method) = ("", "");
1312 is($t eq 'whatever', 'true', 'nomethod makes eq return "true"');
1313 is($method, 'nomethod');
1314 is($warning, "", 'nomethod eq need not return number');
1315
1316 eval q{
1317 package nomethod_false;
1318 use overload cmp => sub { $method = 'cmp'; 0 };
1319 };
1320 $f = bless [], 'nomethod_false';
1321 ($warning, $method) = ("", "");
1322 ok($f eq 'whatever', 'eq falls back to cmp (nomethod not called)');
1323 is($method, 'cmp');
1324
1325 eval q{
1326 package nomethod_true;
1327 use overload cmp => sub { $method = 'cmp'; 'true' };
1328 };
1329 $t = bless [], 'nomethod_true';
1330 ($warning, $method) = ("", "");
1331 ok($t eq 'whatever', 'eq falls back to cmp (nomethod not called)');
1332 is($method, 'cmp');
1333 like($warning, qr/isn't numeric/, 'cmp should return number');
1334
1335}
2c615c57
NC
1336
1337{
1338 # Subtle bug pre 5.10, as a side effect of the overloading flag being
b0bf6df7 1339 # stored on the reference rather than the referent. Despite the fact that
2c615c57 1340 # objects can only be accessed via references (even internally), the
b0bf6df7 1341 # referent actually knows that it's blessed, not the references. So taking
2c615c57
NC
1342 # a new, unrelated, reference to it gives an object. However, the
1343 # overloading-or-not flag was on the reference prior to 5.10, and taking
1344 # a new reference didn't (use to) copy it.
1345
1346 package kayo;
1347
1348 use overload '""' => sub {${$_[0]}};
1349
1350 sub Pie {
1351 return "$_[0], $_[1]";
1352 }
1353
1354 package main;
1355
1356 my $class = 'kayo';
1357 my $string = 'bam';
1358 my $crunch_eth = bless \$string, $class;
1359
1360 is("$crunch_eth", $string);
1361 is ($crunch_eth->Pie("Meat"), "$string, Meat");
1362
1363 my $wham_eth = \$string;
1364
1365 is("$wham_eth", $string,
1366 'This reference did not have overloading in 5.8.8 and earlier');
1367 is ($crunch_eth->Pie("Apple"), "$string, Apple");
1368
1369 my $class = ref $wham_eth;
1370 $class =~ s/=.*//;
1371
1372 # Bless it back into its own class!
1373 bless $wham_eth, $class;
1374
1375 is("$wham_eth", $string);
1376 is ($crunch_eth->Pie("Blackbird"), "$string, Blackbird");
1377}
c781a409
RD
1378
1379{
1380 package numify_int;
1381 use overload "0+" => sub { $_[0][0] += 1; 42 };
1382 package numify_self;
1383 use overload "0+" => sub { $_[0][0]++; $_[0] };
1384 package numify_other;
1385 use overload "0+" => sub { $_[0][0]++; $_[0][1] = bless [], 'numify_int' };
e28bb1d5 1386 package numify_by_fallback;
800401ee 1387 use overload fallback => 1;
c781a409
RD
1388
1389 package main;
1390 my $o = bless [], 'numify_int';
1391 is(int($o), 42, 'numifies to integer');
1392 is($o->[0], 1, 'int() numifies only once');
1393
1394 my $aref = [];
93521010 1395 my $num_val = int($aref);
c781a409
RD
1396 my $r = bless $aref, 'numify_self';
1397 is(int($r), $num_val, 'numifies to self');
1398 is($r->[0], 1, 'int() numifies once when returning self');
1399
1400 my $s = bless [], 'numify_other';
1401 is(int($s), 42, 'numifies to numification of other object');
1402 is($s->[0], 1, 'int() numifies once when returning other object');
1403 is($s->[1][0], 1, 'returned object numifies too');
e28bb1d5
RD
1404
1405 my $m = bless $aref, 'numify_by_fallback';
1406 is(int($m), $num_val, 'numifies to usual reference value');
800401ee
JH
1407 is(abs($m), $num_val, 'numifies to usual reference value');
1408 is(-$m, -$num_val, 'numifies to usual reference value');
1409 is(0+$m, $num_val, 'numifies to usual reference value');
1410 is($m+0, $num_val, 'numifies to usual reference value');
1411 is($m+$m, 2*$num_val, 'numifies to usual reference value');
1412 is(0-$m, -$num_val, 'numifies to usual reference value');
1413 is(1*$m, $num_val, 'numifies to usual reference value');
1414 is($m/1, $num_val, 'numifies to usual reference value');
1415 is($m%100, $num_val%100, 'numifies to usual reference value');
1416 is($m**1, $num_val, 'numifies to usual reference value');
1417
1418 is(abs($aref), $num_val, 'abs() of ref');
1419 is(-$aref, -$num_val, 'negative of ref');
1420 is(0+$aref, $num_val, 'ref addition');
1421 is($aref+0, $num_val, 'ref addition');
1422 is($aref+$aref, 2*$num_val, 'ref addition');
1423 is(0-$aref, -$num_val, 'subtraction of ref');
1424 is(1*$aref, $num_val, 'multiplicaton of ref');
1425 is($aref/1, $num_val, 'division of ref');
1426 is($aref%100, $num_val%100, 'modulo of ref');
1427 is($aref**1, $num_val, 'exponentiation of ref');
c781a409 1428}
800401ee
JH
1429
1430# EOF