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Add a new overload type, "qr".
[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;
7898bf0b 50use Test::More tests => 577;
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($out, 1024);
7898bf0b
RGS
364is($int, 9);
365{
366 BEGIN { overload::constant 'integer' => sub {$int++; shift()+1}; }
367 eval q{$out = 42};
368}
369is($int, 10);
370is($out, 43);
b3ac6de7
IZ
371
372$foo = 'foo';
373$foo1 = 'f\'o\\o';
374{
375 BEGIN { $q = $qr = 7;
376 overload::constant 'q' => sub {$q++; push @q, shift, ($_[1] || 'none'); shift},
377 'qr' => sub {$qr++; push @qr, shift, ($_[1] || 'none'); shift}; }
378 $out = 'foo';
379 $out1 = 'f\'o\\o';
380 $out2 = "a\a$foo,\,";
381 /b\b$foo.\./;
382}
383
fdb7e2a2
NC
384is($out, 'foo');
385is($out, $foo);
386is($out1, 'f\'o\\o');
387is($out1, $foo1);
388is($out2, "a\afoo,\,");
389is("@q", "foo q f'o\\\\o q a\\a qq ,\\, qq");
390is($q, 11);
391is("@qr", "b\\b qq .\\. qq");
392is($qr, 9);
b3ac6de7
IZ
393
394{
395 $_ = '!<b>!foo!<-.>!';
396 BEGIN { overload::constant 'q' => sub {push @q1, shift, ($_[1] || 'none'); "_<" . (shift) . ">_"},
397 'qr' => sub {push @qr1, shift, ($_[1] || 'none'); "!<" . (shift) . ">!"}; }
398 $out = 'foo';
399 $out1 = 'f\'o\\o';
400 $out2 = "a\a$foo,\,";
401 $res = /b\b$foo.\./;
402 $a = <<EOF;
403oups
404EOF
405 $b = <<'EOF';
406oups1
407EOF
408 $c = bareword;
409 m'try it';
410 s'first part'second part';
411 s/yet another/tail here/;
c2e66d9e 412 tr/A-Z/a-z/;
b3ac6de7
IZ
413}
414
fdb7e2a2
NC
415is($out, '_<foo>_');
416is($out1, '_<f\'o\\o>_');
417is($out2, "_<a\a>_foo_<,\,>_");
418is("@q1", "foo q f'o\\\\o q a\\a qq ,\\, qq oups
b3ac6de7 419 qq oups1
fdb7e2a2
NC
420 q second part q tail here s A-Z tr a-z tr");
421is("@qr1", "b\\b qq .\\. qq try it q first part q yet another qq");
422is($res, 1);
423is($a, "_<oups
424>_");
425is($b, "_<oups1
426>_");
427is($c, "bareword");
b3ac6de7 428
ee239bfe
IZ
429{
430 package symbolic; # Primitive symbolic calculator
431 use overload nomethod => \&wrap, '""' => \&str, '0+' => \&num,
432 '=' => \&cpy, '++' => \&inc, '--' => \&dec;
433
434 sub new { shift; bless ['n', @_] }
435 sub cpy {
436 my $self = shift;
437 bless [@$self], ref $self;
438 }
439 sub inc { $_[0] = bless ['++', $_[0], 1]; }
440 sub dec { $_[0] = bless ['--', $_[0], 1]; }
441 sub wrap {
442 my ($obj, $other, $inv, $meth) = @_;
443 if ($meth eq '++' or $meth eq '--') {
444 @$obj = ($meth, (bless [@$obj]), 1); # Avoid circular reference
445 return $obj;
446 }
447 ($obj, $other) = ($other, $obj) if $inv;
448 bless [$meth, $obj, $other];
449 }
450 sub str {
451 my ($meth, $a, $b) = @{+shift};
452 $a = 'u' unless defined $a;
453 if (defined $b) {
454 "[$meth $a $b]";
455 } else {
456 "[$meth $a]";
457 }
458 }
459 my %subr = ( 'n' => sub {$_[0]} );
460 foreach my $op (split " ", $overload::ops{with_assign}) {
461 $subr{$op} = $subr{"$op="} = eval "sub {shift() $op shift()}";
462 }
463 my @bins = qw(binary 3way_comparison num_comparison str_comparison);
464 foreach my $op (split " ", "@overload::ops{ @bins }") {
465 $subr{$op} = eval "sub {shift() $op shift()}";
466 }
467 foreach my $op (split " ", "@overload::ops{qw(unary func)}") {
468 $subr{$op} = eval "sub {$op shift()}";
469 }
470 $subr{'++'} = $subr{'+'};
471 $subr{'--'} = $subr{'-'};
472
473 sub num {
474 my ($meth, $a, $b) = @{+shift};
475 my $subr = $subr{$meth}
476 or die "Do not know how to ($meth) in symbolic";
477 $a = $a->num if ref $a eq __PACKAGE__;
478 $b = $b->num if ref $b eq __PACKAGE__;
479 $subr->($a,$b);
480 }
481 sub TIESCALAR { my $pack = shift; $pack->new(@_) }
482 sub FETCH { shift }
483 sub nop { } # Around a bug
484 sub vars { my $p = shift; tie($_, $p), $_->nop foreach @_; }
485 sub STORE {
486 my $obj = shift;
487 $#$obj = 1;
a1063b2d 488 $obj->[1] = shift;
ee239bfe
IZ
489 }
490}
491
492{
493 my $foo = new symbolic 11;
494 my $baz = $foo++;
fdb7e2a2
NC
495 is((sprintf "%d", $foo), '12');
496 is((sprintf "%d", $baz), '11');
ee239bfe
IZ
497 my $bar = $foo;
498 $baz = ++$foo;
fdb7e2a2
NC
499 is((sprintf "%d", $foo), '13');
500 is((sprintf "%d", $bar), '12');
501 is((sprintf "%d", $baz), '13');
ee239bfe
IZ
502 my $ban = $foo;
503 $baz = ($foo += 1);
fdb7e2a2
NC
504 is((sprintf "%d", $foo), '14');
505 is((sprintf "%d", $bar), '12');
506 is((sprintf "%d", $baz), '14');
507 is((sprintf "%d", $ban), '13');
ee239bfe
IZ
508 $baz = 0;
509 $baz = $foo++;
fdb7e2a2
NC
510 is((sprintf "%d", $foo), '15');
511 is((sprintf "%d", $baz), '14');
512 is("$foo", '[++ [+= [++ [++ [n 11] 1] 1] 1] 1]');
ee239bfe
IZ
513}
514
515{
516 my $iter = new symbolic 2;
517 my $side = new symbolic 1;
518 my $cnt = $iter;
519
520 while ($cnt) {
521 $cnt = $cnt - 1; # The "simple" way
522 $side = (sqrt(1 + $side**2) - 1)/$side;
523 }
524 my $pi = $side*(2**($iter+2));
fdb7e2a2
NC
525 is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
526 is((sprintf "%f", $pi), '3.182598');
ee239bfe
IZ
527}
528
529{
530 my $iter = new symbolic 2;
531 my $side = new symbolic 1;
532 my $cnt = $iter;
533
534 while ($cnt--) {
535 $side = (sqrt(1 + $side**2) - 1)/$side;
536 }
537 my $pi = $side*(2**($iter+2));
fdb7e2a2
NC
538 is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
539 is((sprintf "%f", $pi), '3.182598');
ee239bfe
IZ
540}
541
542{
543 my ($a, $b);
544 symbolic->vars($a, $b);
545 my $c = sqrt($a**2 + $b**2);
546 $a = 3; $b = 4;
fdb7e2a2 547 is((sprintf "%d", $c), '5');
ee239bfe 548 $a = 12; $b = 5;
fdb7e2a2 549 is((sprintf "%d", $c), '13');
ee239bfe
IZ
550}
551
552{
553 package symbolic1; # Primitive symbolic calculator
554 # Mutator inc/dec
555 use overload nomethod => \&wrap, '""' => \&str, '0+' => \&num, '=' => \&cpy;
556
557 sub new { shift; bless ['n', @_] }
558 sub cpy {
559 my $self = shift;
560 bless [@$self], ref $self;
561 }
562 sub wrap {
563 my ($obj, $other, $inv, $meth) = @_;
564 if ($meth eq '++' or $meth eq '--') {
565 @$obj = ($meth, (bless [@$obj]), 1); # Avoid circular reference
566 return $obj;
567 }
568 ($obj, $other) = ($other, $obj) if $inv;
569 bless [$meth, $obj, $other];
570 }
571 sub str {
572 my ($meth, $a, $b) = @{+shift};
573 $a = 'u' unless defined $a;
574 if (defined $b) {
575 "[$meth $a $b]";
576 } else {
577 "[$meth $a]";
578 }
579 }
580 my %subr = ( 'n' => sub {$_[0]} );
581 foreach my $op (split " ", $overload::ops{with_assign}) {
582 $subr{$op} = $subr{"$op="} = eval "sub {shift() $op shift()}";
583 }
584 my @bins = qw(binary 3way_comparison num_comparison str_comparison);
585 foreach my $op (split " ", "@overload::ops{ @bins }") {
586 $subr{$op} = eval "sub {shift() $op shift()}";
587 }
588 foreach my $op (split " ", "@overload::ops{qw(unary func)}") {
589 $subr{$op} = eval "sub {$op shift()}";
590 }
591 $subr{'++'} = $subr{'+'};
592 $subr{'--'} = $subr{'-'};
593
594 sub num {
595 my ($meth, $a, $b) = @{+shift};
596 my $subr = $subr{$meth}
597 or die "Do not know how to ($meth) in symbolic";
598 $a = $a->num if ref $a eq __PACKAGE__;
599 $b = $b->num if ref $b eq __PACKAGE__;
600 $subr->($a,$b);
601 }
602 sub TIESCALAR { my $pack = shift; $pack->new(@_) }
603 sub FETCH { shift }
604 sub nop { } # Around a bug
605 sub vars { my $p = shift; tie($_, $p), $_->nop foreach @_; }
606 sub STORE {
607 my $obj = shift;
608 $#$obj = 1;
a1063b2d 609 $obj->[1] = shift;
ee239bfe
IZ
610 }
611}
612
613{
614 my $foo = new symbolic1 11;
615 my $baz = $foo++;
fdb7e2a2
NC
616 is((sprintf "%d", $foo), '12');
617 is((sprintf "%d", $baz), '11');
ee239bfe
IZ
618 my $bar = $foo;
619 $baz = ++$foo;
fdb7e2a2
NC
620 is((sprintf "%d", $foo), '13');
621 is((sprintf "%d", $bar), '12');
622 is((sprintf "%d", $baz), '13');
ee239bfe
IZ
623 my $ban = $foo;
624 $baz = ($foo += 1);
fdb7e2a2
NC
625 is((sprintf "%d", $foo), '14');
626 is((sprintf "%d", $bar), '12');
627 is((sprintf "%d", $baz), '14');
628 is((sprintf "%d", $ban), '13');
ee239bfe
IZ
629 $baz = 0;
630 $baz = $foo++;
fdb7e2a2
NC
631 is((sprintf "%d", $foo), '15');
632 is((sprintf "%d", $baz), '14');
633 is("$foo", '[++ [+= [++ [++ [n 11] 1] 1] 1] 1]');
ee239bfe
IZ
634}
635
636{
637 my $iter = new symbolic1 2;
638 my $side = new symbolic1 1;
639 my $cnt = $iter;
640
641 while ($cnt) {
642 $cnt = $cnt - 1; # The "simple" way
643 $side = (sqrt(1 + $side**2) - 1)/$side;
644 }
645 my $pi = $side*(2**($iter+2));
fdb7e2a2
NC
646 is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
647 is((sprintf "%f", $pi), '3.182598');
ee239bfe
IZ
648}
649
650{
651 my $iter = new symbolic1 2;
652 my $side = new symbolic1 1;
653 my $cnt = $iter;
654
655 while ($cnt--) {
656 $side = (sqrt(1 + $side**2) - 1)/$side;
657 }
658 my $pi = $side*(2**($iter+2));
fdb7e2a2
NC
659 is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
660 is((sprintf "%f", $pi), '3.182598');
ee239bfe
IZ
661}
662
663{
664 my ($a, $b);
665 symbolic1->vars($a, $b);
666 my $c = sqrt($a**2 + $b**2);
667 $a = 3; $b = 4;
fdb7e2a2 668 is((sprintf "%d", $c), '5');
ee239bfe 669 $a = 12; $b = 5;
fdb7e2a2 670 is((sprintf "%d", $c), '13');
ee239bfe
IZ
671}
672
673{
674 package two_face; # Scalars with separate string and
675 # numeric values.
676 sub new { my $p = shift; bless [@_], $p }
677 use overload '""' => \&str, '0+' => \&num, fallback => 1;
678 sub num {shift->[1]}
679 sub str {shift->[0]}
680}
681
682{
683 my $seven = new two_face ("vii", 7);
fdb7e2a2 684 is((sprintf "seven=$seven, seven=%d, eight=%d", $seven, $seven+1),
ee239bfe 685 'seven=vii, seven=7, eight=8');
fdb7e2a2 686 is(scalar ($seven =~ /i/), '1');
ee239bfe 687}
b3ac6de7 688
d0ecd44c
IZ
689{
690 package sorting;
691 use overload 'cmp' => \&comp;
692 sub new { my ($p, $v) = @_; bless \$v, $p }
693 sub comp { my ($x,$y) = @_; ($$x * 3 % 10) <=> ($$y * 3 % 10) or $$x cmp $$y }
694}
695{
696 my @arr = map sorting->new($_), 0..12;
697 my @sorted1 = sort @arr;
698 my @sorted2 = map $$_, @sorted1;
7bf00c86 699 is("@sorted2", '0 10 7 4 1 11 8 5 12 2 9 6 3');
d0ecd44c 700}
f5284f61
IZ
701{
702 package iterator;
703 use overload '<>' => \&iter;
704 sub new { my ($p, $v) = @_; bless \$v, $p }
705 sub iter { my ($x) = @_; return undef if $$x < 0; return $$x--; }
706}
72b16652
GS
707
708# XXX iterator overload not intended to work with CORE::GLOBAL?
709if (defined &CORE::GLOBAL::glob) {
7bf00c86
NC
710 is('1', '1');
711 is('1', '1');
712 is('1', '1');
72b16652
GS
713}
714else {
f5284f61
IZ
715 my $iter = iterator->new(5);
716 my $acc = '';
717 my $out;
718 $acc .= " $out" while $out = <${iter}>;
7bf00c86 719 is($acc, ' 5 4 3 2 1 0');
f5284f61 720 $iter = iterator->new(5);
7bf00c86 721 is(scalar <${iter}>, '5');
f5284f61 722 $acc = '';
b04ef359 723 $acc .= " $out" while $out = <$iter>;
7bf00c86 724 is($acc, ' 4 3 2 1 0');
f5284f61
IZ
725}
726{
727 package deref;
728 use overload '%{}' => \&hderef, '&{}' => \&cderef,
729 '*{}' => \&gderef, '${}' => \&sderef, '@{}' => \&aderef;
730 sub new { my ($p, $v) = @_; bless \$v, $p }
731 sub deref {
732 my ($self, $key) = (shift, shift);
733 my $class = ref $self;
734 bless $self, 'deref::dummy'; # Disable overloading of %{}
735 my $out = $self->{$key};
736 bless $self, $class; # Restore overloading
737 $out;
738 }
739 sub hderef {shift->deref('h')}
740 sub aderef {shift->deref('a')}
741 sub cderef {shift->deref('c')}
742 sub gderef {shift->deref('g')}
743 sub sderef {shift->deref('s')}
744}
745{
746 my $deref = bless { h => { foo => 5 , fake => 23 },
747 c => sub {return shift() + 34},
748 's' => \123,
749 a => [11..13],
750 g => \*srt,
751 }, 'deref';
752 # Hash:
753 my @cont = sort %$deref;
b0bf6df7 754 if ("\t" eq "\011") { # ASCII
7bf00c86 755 is("@cont", '23 5 fake foo');
f70c35af 756 }
b0bf6df7 757 else { # EBCDIC alpha-numeric sort order
7bf00c86 758 is("@cont", 'fake foo 23 5');
f70c35af 759 }
f5284f61 760 my @keys = sort keys %$deref;
7bf00c86 761 is("@keys", 'fake foo');
f5284f61 762 my @val = sort values %$deref;
7bf00c86
NC
763 is("@val", '23 5');
764 is($deref->{foo}, 5);
765 is(defined $deref->{bar}, '');
f5284f61
IZ
766 my $key;
767 @keys = ();
768 push @keys, $key while $key = each %$deref;
769 @keys = sort @keys;
7bf00c86
NC
770 is("@keys", 'fake foo');
771 is(exists $deref->{bar}, '');
772 is(exists $deref->{foo}, 1);
f5284f61 773 # Code:
7bf00c86
NC
774 is($deref->(5), 39);
775 is(&$deref(6), 40);
f5284f61 776 sub xxx_goto { goto &$deref }
7bf00c86 777 is(xxx_goto(7), 41);
f5284f61
IZ
778 my $srt = bless { c => sub {$b <=> $a}
779 }, 'deref';
780 *srt = \&$srt;
781 my @sorted = sort srt 11, 2, 5, 1, 22;
7bf00c86 782 is("@sorted", '22 11 5 2 1');
f5284f61 783 # Scalar
7bf00c86 784 is($$deref, 123);
c6e96bcb
GS
785 # Code
786 @sorted = sort $srt 11, 2, 5, 1, 22;
7bf00c86 787 is("@sorted", '22 11 5 2 1');
f5284f61 788 # Array
7bf00c86
NC
789 is("@$deref", '11 12 13');
790 is($#$deref, '2');
f5284f61 791 my $l = @$deref;
7bf00c86
NC
792 is($l, 3);
793 is($deref->[2], '13');
f5284f61 794 $l = pop @$deref;
7bf00c86 795 is($l, 13);
f5284f61 796 $l = 1;
7bf00c86 797 is($deref->[$l], '12');
f5284f61
IZ
798 # Repeated dereference
799 my $double = bless { h => $deref,
800 }, 'deref';
7bf00c86 801 is($double->{foo}, 5);
f5284f61
IZ
802}
803
804{
805 package two_refs;
806 use overload '%{}' => \&gethash, '@{}' => sub { ${shift()} };
807 sub new {
808 my $p = shift;
809 bless \ [@_], $p;
810 }
811 sub gethash {
812 my %h;
813 my $self = shift;
814 tie %h, ref $self, $self;
815 \%h;
816 }
817
818 sub TIEHASH { my $p = shift; bless \ shift, $p }
819 my %fields;
820 my $i = 0;
821 $fields{$_} = $i++ foreach qw{zero one two three};
822 sub STORE {
823 my $self = ${shift()};
824 my $key = $fields{shift()};
825 defined $key or die "Out of band access";
826 $$self->[$key] = shift;
827 }
828 sub FETCH {
829 my $self = ${shift()};
830 my $key = $fields{shift()};
831 defined $key or die "Out of band access";
832 $$self->[$key];
833 }
834}
835
836my $bar = new two_refs 3,4,5,6;
837$bar->[2] = 11;
7bf00c86 838is($bar->{two}, 11);
f5284f61 839$bar->{three} = 13;
7bf00c86 840is($bar->[3], 13);
f5284f61
IZ
841
842{
843 package two_refs_o;
844 @ISA = ('two_refs');
845}
846
847$bar = new two_refs_o 3,4,5,6;
848$bar->[2] = 11;
7bf00c86 849is($bar->{two}, 11);
f5284f61 850$bar->{three} = 13;
7bf00c86 851is($bar->[3], 13);
f5284f61
IZ
852
853{
854 package two_refs1;
855 use overload '%{}' => sub { ${shift()}->[1] },
856 '@{}' => sub { ${shift()}->[0] };
857 sub new {
858 my $p = shift;
859 my $a = [@_];
860 my %h;
861 tie %h, $p, $a;
862 bless \ [$a, \%h], $p;
863 }
864 sub gethash {
865 my %h;
866 my $self = shift;
867 tie %h, ref $self, $self;
868 \%h;
869 }
870
871 sub TIEHASH { my $p = shift; bless \ shift, $p }
872 my %fields;
873 my $i = 0;
874 $fields{$_} = $i++ foreach qw{zero one two three};
875 sub STORE {
876 my $a = ${shift()};
877 my $key = $fields{shift()};
878 defined $key or die "Out of band access";
879 $a->[$key] = shift;
880 }
881 sub FETCH {
882 my $a = ${shift()};
883 my $key = $fields{shift()};
884 defined $key or die "Out of band access";
885 $a->[$key];
886 }
887}
888
889$bar = new two_refs_o 3,4,5,6;
890$bar->[2] = 11;
7bf00c86 891is($bar->{two}, 11);
f5284f61 892$bar->{three} = 13;
7bf00c86 893is($bar->[3], 13);
f5284f61
IZ
894
895{
896 package two_refs1_o;
897 @ISA = ('two_refs1');
898}
899
900$bar = new two_refs1_o 3,4,5,6;
901$bar->[2] = 11;
7bf00c86 902is($bar->{two}, 11);
f5284f61 903$bar->{three} = 13;
7bf00c86 904is($bar->[3], 13);
f5284f61 905
fe7ac86a
IZ
906{
907 package B;
908 use overload bool => sub { ${+shift} };
909}
910
911my $aaa;
912{ my $bbbb = 0; $aaa = bless \$bbbb, B }
913
7bf00c86 914is !$aaa, 1;
fe7ac86a
IZ
915
916unless ($aaa) {
7bf00c86 917 pass();
fe7ac86a 918} else {
7bf00c86 919 fail();
fe7ac86a
IZ
920}
921
1426bbf4
MG
922# check that overload isn't done twice by join
923{ my $c = 0;
924 package Join;
925 use overload '""' => sub { $c++ };
926 my $x = join '', bless([]), 'pq', bless([]);
7bf00c86 927 main::is $x, '0pq1';
1426bbf4 928};
fe7ac86a 929
4498a751
PM
930# Test module-specific warning
931{
932 # check the Odd number of arguments for overload::constant warning
933 my $a = "" ;
0a911d86 934 local $SIG{__WARN__} = sub {$a = $_[0]} ;
4498a751 935 $x = eval ' overload::constant "integer" ; ' ;
7bf00c86 936 is($a, "");
4498a751
PM
937 use warnings 'overload' ;
938 $x = eval ' overload::constant "integer" ; ' ;
7bf00c86 939 like($a, qr/^Odd number of arguments for overload::constant at/);
4498a751
PM
940}
941
942{
943 # check the `$_[0]' is not an overloadable type warning
944 my $a = "" ;
0a911d86 945 local $SIG{__WARN__} = sub {$a = $_[0]} ;
4498a751 946 $x = eval ' overload::constant "fred" => sub {} ; ' ;
7bf00c86 947 is($a, "");
4498a751
PM
948 use warnings 'overload' ;
949 $x = eval ' overload::constant "fred" => sub {} ; ' ;
7bf00c86 950 like($a, qr/^`fred' is not an overloadable type at/);
4498a751
PM
951}
952
953{
954 # check the `$_[1]' is not a code reference warning
955 my $a = "" ;
0a911d86 956 local $SIG{__WARN__} = sub {$a = $_[0]} ;
4498a751 957 $x = eval ' overload::constant "integer" => 1; ' ;
7bf00c86 958 is($a, "");
4498a751
PM
959 use warnings 'overload' ;
960 $x = eval ' overload::constant "integer" => 1; ' ;
7bf00c86 961 like($a, qr/^`1' is not a code reference at/);
4498a751
PM
962}
963
78f67eb5
JH
964{
965 my $c = 0;
966 package ov_int1;
967 use overload '""' => sub { 3+shift->[0] },
968 '0+' => sub { 10+shift->[0] },
969 'int' => sub { 100+shift->[0] };
970 sub new {my $p = shift; bless [shift], $p}
971
972 package ov_int2;
973 use overload '""' => sub { 5+shift->[0] },
974 '0+' => sub { 30+shift->[0] },
975 'int' => sub { 'ov_int1'->new(1000+shift->[0]) };
976 sub new {my $p = shift; bless [shift], $p}
977
978 package noov_int;
979 use overload '""' => sub { 2+shift->[0] },
980 '0+' => sub { 9+shift->[0] };
981 sub new {my $p = shift; bless [shift], $p}
982
983 package main;
984
985 my $x = new noov_int 11;
986 my $int_x = int $x;
7bf00c86 987 main::is("$int_x", 20);
78f67eb5
JH
988 $x = new ov_int1 31;
989 $int_x = int $x;
7bf00c86 990 main::is("$int_x", 131);
78f67eb5
JH
991 $x = new ov_int2 51;
992 $int_x = int $x;
7bf00c86 993 main::is("$int_x", 1054);
78f67eb5
JH
994}
995
b0bf6df7 996# make sure that we don't infinitely recurse
1554e226
DC
997{
998 my $c = 0;
999 package Recurse;
1000 use overload '""' => sub { shift },
1001 '0+' => sub { shift },
1002 'bool' => sub { shift },
1003 fallback => 1;
1004 my $x = bless([]);
7bf00c86
NC
1005 # For some reason beyond me these have to be oks rather than likes.
1006 main::ok("$x" =~ /Recurse=ARRAY/);
1007 main::ok($x);
1008 main::ok($x+0 =~ qr/Recurse=ARRAY/);
11e3e2e4 1009}
78f67eb5 1010
1dc13c17
SC
1011# BugID 20010422.003
1012package Foo;
1013
1014use overload
1015 'bool' => sub { return !$_[0]->is_zero() || undef; }
1016;
1017
1018sub is_zero
1019 {
1020 my $self = shift;
1021 return $self->{var} == 0;
1022 }
1023
1024sub new
1025 {
1026 my $class = shift;
1027 my $self = {};
1028 $self->{var} = shift;
1029 bless $self,$class;
1030 }
1031
1032package main;
1033
1034use strict;
1035
1036my $r = Foo->new(8);
1037$r = Foo->new(0);
78f67eb5 1038
11e3e2e4 1039is(($r || 0), 0);
1554e226 1040
6050d10e
JP
1041package utf8_o;
1042
1043use overload
1044 '""' => sub { return $_[0]->{var}; }
1045 ;
1046
1047sub new
1048 {
1049 my $class = shift;
1050 my $self = {};
1051 $self->{var} = shift;
1052 bless $self,$class;
1053 }
1054
1055package main;
1056
1057
1058my $utfvar = new utf8_o 200.2.1;
11e3e2e4
NC
1059is("$utfvar", 200.2.1); # 223 - stringify
1060is("a$utfvar", "a".200.2.1); # 224 - overload via sv_2pv_flags
6050d10e 1061
446eaa42 1062# 225..227 -- more %{} tests. Hangs in 5.6.0, okay in later releases.
41cb1005
JH
1063# Basically this example implements strong encapsulation: if Hderef::import()
1064# were to eval the overload code in the caller's namespace, the privatisation
1065# would be quite transparent.
1066package Hderef;
1067use overload '%{}' => sub { (caller(0))[0] eq 'Foo' ? $_[0] : die "zap" };
1068package Foo;
1069@Foo::ISA = 'Hderef';
1070sub new { bless {}, shift }
1071sub xet { @_ == 2 ? $_[0]->{$_[1]} :
1072 @_ == 3 ? ($_[0]->{$_[1]} = $_[2]) : undef }
1073package main;
1074my $a = Foo->new;
1075$a->xet('b', 42);
11e3e2e4
NC
1076is ($a->xet('b'), 42);
1077ok (!defined eval { $a->{b} });
1078like ($@, qr/zap/);
41cb1005 1079
29ddfe35
RD
1080{
1081 package t229;
1082 use overload '=' => sub { 42 },
1083 '++' => sub { my $x = ${$_[0]}; $_[0] };
1084 sub new { my $x = 42; bless \$x }
1085
1086 my $warn;
1087 {
1088 local $SIG{__WARN__} = sub { $warn++ };
1089 my $x = t229->new;
1090 my $y = $x;
1091 eval { $y++ };
1092 }
11e3e2e4 1093 main::ok (!$warn);
61f33854
RGS
1094}
1095
1096{
1097 my ($int, $out1, $out2);
1098 {
1099 BEGIN { $int = 0; overload::constant 'integer' => sub {$int++; 17}; }
1100 $out1 = 0;
1101 $out2 = 1;
1102 }
11e3e2e4
NC
1103 is($int, 2, "#24313"); # 230
1104 is($out1, 17, "#24313"); # 231
1105 is($out2, 17, "#24313"); # 232
29ddfe35
RD
1106}
1107
0bdaccee
NC
1108{
1109 package Numify;
1110 use overload (qw(0+ numify fallback 1));
1111
1112 sub new {
1113 my $val = $_[1];
1114 bless \$val, $_[0];
1115 }
1116
1117 sub numify { ${$_[0]} }
1118}
1119
d411a6a9
RD
1120{
1121 package perl31793;
1b1d102f
RD
1122 use overload cmp => sub { 0 };
1123 package perl31793_fb;
76c43448 1124 use overload cmp => sub { 0 }, fallback => 1;
d411a6a9
RD
1125 package main;
1126 my $o = bless [], 'perl31793';
1b1d102f 1127 my $of = bless [], 'perl31793_fb';
d411a6a9 1128 my $no = bless [], 'no_overload';
11e3e2e4
NC
1129 like(overload::StrVal(\"scalar"), qr/^SCALAR\(0x[0-9a-f]+\)$/);
1130 like(overload::StrVal([]), qr/^ARRAY\(0x[0-9a-f]+\)$/);
1131 like(overload::StrVal({}), qr/^HASH\(0x[0-9a-f]+\)$/);
1132 like(overload::StrVal(sub{1}), qr/^CODE\(0x[0-9a-f]+\)$/);
1133 like(overload::StrVal(\*GLOB), qr/^GLOB\(0x[0-9a-f]+\)$/);
1134 like(overload::StrVal(\$o), qr/^REF\(0x[0-9a-f]+\)$/);
0fc92fc6 1135 like(overload::StrVal(qr/a/), qr/^Regexp=REGEXP\(0x[0-9a-f]+\)$/);
11e3e2e4
NC
1136 like(overload::StrVal($o), qr/^perl31793=ARRAY\(0x[0-9a-f]+\)$/);
1137 like(overload::StrVal($of), qr/^perl31793_fb=ARRAY\(0x[0-9a-f]+\)$/);
1138 like(overload::StrVal($no), qr/^no_overload=ARRAY\(0x[0-9a-f]+\)$/);
d411a6a9
RD
1139}
1140
b0bf6df7 1141# These are all check that overloaded values rather than reference addresses
0bdaccee
NC
1142# are what is getting tested.
1143my ($two, $one, $un, $deux) = map {new Numify $_} 2, 1, 1, 2;
1144my ($ein, $zwei) = (1, 2);
1145
1146my %map = (one => 1, un => 1, ein => 1, deux => 2, two => 2, zwei => 2);
1147foreach my $op (qw(<=> == != < <= > >=)) {
1148 foreach my $l (keys %map) {
1149 foreach my $r (keys %map) {
1150 my $ocode = "\$$l $op \$$r";
1151 my $rcode = "$map{$l} $op $map{$r}";
1152
1153 my $got = eval $ocode;
1154 die if $@;
1155 my $expect = eval $rcode;
1156 die if $@;
11e3e2e4 1157 is ($got, $expect, $ocode) or print "# $rcode\n";
0bdaccee
NC
1158 }
1159 }
1160}
131b3ad0
DM
1161{
1162 # check that overloading works in regexes
1163 {
1164 package Foo493;
1165 use overload
1166 '""' => sub { "^$_[0][0]\$" },
1167 '.' => sub {
1168 bless [
1169 $_[2]
1170 ? (ref $_[1] ? $_[1][0] : $_[1]) . ':' .$_[0][0]
1171 : $_[0][0] . ':' . (ref $_[1] ? $_[1][0] : $_[1])
1172 ], 'Foo493'
1173 };
1174 }
1175
1176 my $a = bless [ "a" ], 'Foo493';
11e3e2e4
NC
1177 like('a', qr/$a/);
1178 like('x:a', qr/x$a/);
1179 like('x:a:=', qr/x$a=$/);
1180 like('x:a:a:=', qr/x$a$a=$/);
131b3ad0
DM
1181
1182}
1183
705c898c
RH
1184{
1185 my $twenty_three = 23;
1186 # Check that constant overloading propagates into evals
1187 BEGIN { overload::constant integer => sub { 23 } }
11e3e2e4 1188 is(eval "17", $twenty_three);
705c898c 1189}
dd2eae66
NC
1190
1191{
1192 package Sklorsh;
1193 use overload
1194 bool => sub { shift->is_cool };
1195
1196 sub is_cool {
1197 $_[0]->{name} eq 'cool';
1198 }
1199
1200 sub delete {
1201 undef %{$_[0]};
1202 bless $_[0], 'Brap';
1203 return 1;
1204 }
1205
1206 sub delete_with_self {
1207 my $self = shift;
1208 undef %$self;
1209 bless $self, 'Brap';
1210 return 1;
1211 }
1212
1213 package Brap;
1214
1215 1;
1216
1217 package main;
1218
1219 my $obj;
1220 $obj = bless {name => 'cool'}, 'Sklorsh';
1221 $obj->delete;
b0bf6df7 1222 ok(eval {if ($obj) {1}; 1}, $@ || 'reblessed into nonexistent namespace');
dd2eae66
NC
1223
1224 $obj = bless {name => 'cool'}, 'Sklorsh';
1225 $obj->delete_with_self;
1226 ok (eval {if ($obj) {1}; 1}, $@);
1227
1228 my $a = $b = {name => 'hot'};
1229 bless $b, 'Sklorsh';
1230 is(ref $a, 'Sklorsh');
1231 is(ref $b, 'Sklorsh');
1232 ok(!$b, "Expect overloaded boolean");
1233 ok(!$a, "Expect overloaded boolean");
1234}
edbe35ea
VP
1235
1236{
1237 package Flrbbbbb;
1238 use overload
1239 bool => sub { shift->{truth} eq 'yes' },
1240 '0+' => sub { shift->{truth} eq 'yes' ? '1' : '0' },
1241 '!' => sub { shift->{truth} eq 'no' },
1242 fallback => 1;
1243
1244 sub new { my $class = shift; bless { truth => shift }, $class }
1245
1246 package main;
1247
1248 my $yes = Flrbbbbb->new('yes');
1249 my $x;
1250 $x = 1 if $yes; is($x, 1);
1251 $x = 2 unless $yes; is($x, 1);
1252 $x = 3 if !$yes; is($x, 1);
1253 $x = 4 unless !$yes; is($x, 4);
1254
1255 my $no = Flrbbbbb->new('no');
1256 $x = 0;
1257 $x = 1 if $no; is($x, 0);
1258 $x = 2 unless $no; is($x, 2);
1259 $x = 3 if !$no; is($x, 3);
1260 $x = 4 unless !$no; is($x, 3);
1261
1262 $x = 0;
1263 $x = 1 if !$no && $yes; is($x, 1);
1264 $x = 2 unless !$no && $yes; is($x, 1);
1265 $x = 3 if $no || !$yes; is($x, 1);
1266 $x = 4 unless $no || !$yes; is($x, 4);
1267
1268 $x = 0;
1269 $x = 1 if !$no || !$yes; is($x, 1);
1270 $x = 2 unless !$no || !$yes; is($x, 1);
1271 $x = 3 if !$no && !$yes; is($x, 1);
1272 $x = 4 unless !$no && !$yes; is($x, 4);
1273}
1274
2372186a
NC
1275{
1276 use Scalar::Util 'weaken';
1277
1278 package Shklitza;
1279 use overload '""' => sub {"CLiK KLAK"};
1280
1281 package Ksshfwoom;
2372186a
NC
1282
1283 package main;
1284
1285 my ($obj, $ref);
1286 $obj = bless do {my $a; \$a}, 'Shklitza';
1287 $ref = $obj;
1288
1289 is ($obj, "CLiK KLAK");
1290 is ($ref, "CLiK KLAK");
1291
1292 weaken $ref;
1293 is ($ref, "CLiK KLAK");
1294
1295 bless $obj, 'Ksshfwoom';
1296
cd75d542
NC
1297 like ($obj, qr/^Ksshfwoom=/);
1298 like ($ref, qr/^Ksshfwoom=/);
2372186a
NC
1299
1300 undef $obj;
1301 is ($ref, undef);
1302}
6dd85743
AF
1303
1304{
1305 package bit;
1306 # bit operations have overloadable assignment variants too
1307
1308 sub new { bless \$_[1], $_[0] }
1309
1310 use overload
1311 "&=" => sub { bit->new($_[0]->val . ' & ' . $_[1]->val) },
1312 "^=" => sub { bit->new($_[0]->val . ' ^ ' . $_[1]->val) },
1313 "|" => sub { bit->new($_[0]->val . ' | ' . $_[1]->val) }, # |= by fallback
1314 ;
1315
1316 sub val { ${$_[0]} }
1317
1318 package main;
1319
1320 my $a = bit->new(my $va = 'a');
1321 my $b = bit->new(my $vb = 'b');
1322
1323 $a &= $b;
1324 is($a->val, 'a & b', "overloaded &= works");
1325
1326 my $c = bit->new(my $vc = 'c');
1327
1328 $b ^= $c;
1329 is($b->val, 'b ^ c', "overloaded ^= works");
1330
1331 my $d = bit->new(my $vd = 'd');
1332
1333 $c |= $d;
1334 is($c->val, 'c | d', "overloaded |= (by fallback) works");
1335}
d11ee47c
RD
1336
1337{
1338 # comparison operators with nomethod
1339 my $warning = "";
1340 my $method;
1341
1342 package nomethod_false;
1343 use overload nomethod => sub { $method = 'nomethod'; 0 };
1344
1345 package nomethod_true;
1346 use overload nomethod => sub { $method= 'nomethod'; 'true' };
1347
1348 package main;
1349 local $^W = 1;
1350 local $SIG{__WARN__} = sub { $warning = $_[0] };
1351
1352 my $f = bless [], 'nomethod_false';
1353 ($warning, $method) = ("", "");
1354 is($f eq 'whatever', 0, 'nomethod makes eq return 0');
1355 is($method, 'nomethod');
1356
1357 my $t = bless [], 'nomethod_true';
1358 ($warning, $method) = ("", "");
1359 is($t eq 'whatever', 'true', 'nomethod makes eq return "true"');
1360 is($method, 'nomethod');
1361 is($warning, "", 'nomethod eq need not return number');
1362
1363 eval q{
1364 package nomethod_false;
1365 use overload cmp => sub { $method = 'cmp'; 0 };
1366 };
1367 $f = bless [], 'nomethod_false';
1368 ($warning, $method) = ("", "");
1369 ok($f eq 'whatever', 'eq falls back to cmp (nomethod not called)');
1370 is($method, 'cmp');
1371
1372 eval q{
1373 package nomethod_true;
1374 use overload cmp => sub { $method = 'cmp'; 'true' };
1375 };
1376 $t = bless [], 'nomethod_true';
1377 ($warning, $method) = ("", "");
1378 ok($t eq 'whatever', 'eq falls back to cmp (nomethod not called)');
1379 is($method, 'cmp');
1380 like($warning, qr/isn't numeric/, 'cmp should return number');
1381
1382}
2c615c57
NC
1383
1384{
1385 # Subtle bug pre 5.10, as a side effect of the overloading flag being
b0bf6df7 1386 # stored on the reference rather than the referent. Despite the fact that
2c615c57 1387 # objects can only be accessed via references (even internally), the
b0bf6df7 1388 # referent actually knows that it's blessed, not the references. So taking
2c615c57
NC
1389 # a new, unrelated, reference to it gives an object. However, the
1390 # overloading-or-not flag was on the reference prior to 5.10, and taking
1391 # a new reference didn't (use to) copy it.
1392
1393 package kayo;
1394
1395 use overload '""' => sub {${$_[0]}};
1396
1397 sub Pie {
1398 return "$_[0], $_[1]";
1399 }
1400
1401 package main;
1402
1403 my $class = 'kayo';
1404 my $string = 'bam';
1405 my $crunch_eth = bless \$string, $class;
1406
1407 is("$crunch_eth", $string);
1408 is ($crunch_eth->Pie("Meat"), "$string, Meat");
1409
1410 my $wham_eth = \$string;
1411
1412 is("$wham_eth", $string,
1413 'This reference did not have overloading in 5.8.8 and earlier');
1414 is ($crunch_eth->Pie("Apple"), "$string, Apple");
1415
1416 my $class = ref $wham_eth;
1417 $class =~ s/=.*//;
1418
1419 # Bless it back into its own class!
1420 bless $wham_eth, $class;
1421
1422 is("$wham_eth", $string);
1423 is ($crunch_eth->Pie("Blackbird"), "$string, Blackbird");
1424}
c781a409
RD
1425
1426{
1427 package numify_int;
1428 use overload "0+" => sub { $_[0][0] += 1; 42 };
1429 package numify_self;
1430 use overload "0+" => sub { $_[0][0]++; $_[0] };
1431 package numify_other;
1432 use overload "0+" => sub { $_[0][0]++; $_[0][1] = bless [], 'numify_int' };
e28bb1d5 1433 package numify_by_fallback;
800401ee 1434 use overload fallback => 1;
c781a409
RD
1435
1436 package main;
1437 my $o = bless [], 'numify_int';
1438 is(int($o), 42, 'numifies to integer');
1439 is($o->[0], 1, 'int() numifies only once');
1440
1441 my $aref = [];
93521010 1442 my $num_val = int($aref);
c781a409
RD
1443 my $r = bless $aref, 'numify_self';
1444 is(int($r), $num_val, 'numifies to self');
1445 is($r->[0], 1, 'int() numifies once when returning self');
1446
1447 my $s = bless [], 'numify_other';
1448 is(int($s), 42, 'numifies to numification of other object');
1449 is($s->[0], 1, 'int() numifies once when returning other object');
1450 is($s->[1][0], 1, 'returned object numifies too');
e28bb1d5
RD
1451
1452 my $m = bless $aref, 'numify_by_fallback';
1453 is(int($m), $num_val, 'numifies to usual reference value');
800401ee
JH
1454 is(abs($m), $num_val, 'numifies to usual reference value');
1455 is(-$m, -$num_val, 'numifies to usual reference value');
1456 is(0+$m, $num_val, 'numifies to usual reference value');
1457 is($m+0, $num_val, 'numifies to usual reference value');
1458 is($m+$m, 2*$num_val, 'numifies to usual reference value');
1459 is(0-$m, -$num_val, 'numifies to usual reference value');
1460 is(1*$m, $num_val, 'numifies to usual reference value');
1461 is($m/1, $num_val, 'numifies to usual reference value');
1462 is($m%100, $num_val%100, 'numifies to usual reference value');
1463 is($m**1, $num_val, 'numifies to usual reference value');
1464
1465 is(abs($aref), $num_val, 'abs() of ref');
1466 is(-$aref, -$num_val, 'negative of ref');
1467 is(0+$aref, $num_val, 'ref addition');
1468 is($aref+0, $num_val, 'ref addition');
1469 is($aref+$aref, 2*$num_val, 'ref addition');
1470 is(0-$aref, -$num_val, 'subtraction of ref');
1471 is(1*$aref, $num_val, 'multiplicaton of ref');
1472 is($aref/1, $num_val, 'division of ref');
1473 is($aref%100, $num_val%100, 'modulo of ref');
1474 is($aref**1, $num_val, 'exponentiation of ref');
c781a409 1475}
800401ee 1476
49c95d58
RD
1477{
1478 package CopyConstructorFallback;
1479 use overload
1480 '++' => sub { "$_[0]"; $_[0] },
1481 fallback => 1;
1482 sub new { bless {} => shift }
1483
1484 package main;
1485
1486 my $o = CopyConstructorFallback->new;
1487 my $x = $o++; # would segfault
1488 my $y = ++$o;
1489 is($x, $o, "copy constructor falls back to assignment (postinc)");
1490 is($y, $o, "copy constructor falls back to assignment (preinc)");
1491}
1492
800401ee 1493# EOF