7 if (($Config::Config{'extensions'} !~ m!\bList/Util\b!) ){
8 print "1..0 # Skip -- Perl configured without List::Util module\n";
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]} :
27 '%' => sub {new Oscalar
28 $_[2]? $_[1]%${$_[0]} : ${$_[0]}%$_[1]},
29 '**' => sub {new Oscalar
30 $_[2]? $_[1]**${$_[0]} : ${$_[0]}-$_[1]},
34 0+ numify) # Order of arguments insignificant
42 sub stringify { "${$_[0]}" }
43 sub numify { 0 + "${$_[0]}" } # Not needed, additional overhead
44 # comparing to direct compilation based on
50 BEGIN { require './test.pl' }
53 use Scalar::Util qw(tainted);
55 $a = new Oscalar "087";
60 is(ref $a, "Oscalar");
66 is(ref $c, "Oscalar");
72 is(ref $a, "Oscalar");
76 is(ref $b, "Oscalar");
79 is(ref $a, "Oscalar");
84 is(ref $c, "Oscalar");
87 is(ref $a, "Oscalar");
92 is(ref $b, "Oscalar");
95 is(ref $a, "Oscalar");
97 eval q[ package Oscalar; use overload ('++' => sub { $ {$_[0]}++;$_[0] } ) ];
101 is(ref $a, "Oscalar");
105 is(ref $b, "Oscalar");
108 is(ref $a, "Oscalar");
111 $dummy=bless \$dummy; # Now cache of method should be reloaded
117 is(ref $b, "Oscalar");
120 is(ref $a, "Oscalar");
122 undef $b; # Destroying updates tables too...
124 eval q[package Oscalar; use overload ('++' => sub { $ {$_[0]} += 2; $_[0] } ) ];
128 is(ref $a, "Oscalar");
132 is(ref $b, "Oscalar");
135 is(ref $a, "Oscalar");
138 $dummy=bless \$dummy; # Now cache of method should be reloaded
143 is(ref $b, "Oscalar");
146 is(ref $a, "Oscalar");
151 is(ref $b, "Oscalar");
154 is(ref $a, "Oscalar");
159 eval q[ package Oscalar; use overload ('=' => sub {$main::copies++;
161 local $new=$ {$_[0]};
166 is(ref $b, "Oscalar");
169 is(ref $a, "Oscalar");
173 is(ref $b, "Oscalar");
176 is(ref $a, "Oscalar");
181 is(ref $b, "Oscalar");
184 is(ref $a, "Oscalar");
190 is(ref $b, "Oscalar");
193 is(ref $a, "Oscalar");
199 is(ref $b, "Oscalar");
202 is(ref $a, "Oscalar");
205 eval q[package Oscalar; use overload ('+=' => sub {$ {$_[0]} += 3*$_[1];
207 $c=new Oscalar; # Cause rehash
212 is(ref $b, "Oscalar");
215 is(ref $a, "Oscalar");
220 is(ref $b, "Oscalar");
225 is(ref $b, "Oscalar");
231 is(ref $b, "Oscalar");
237 is(ref $b, "Oscalar");
241 eval q[package Oscalar;
242 use overload ('x' => sub {new Oscalar ( $_[2] ? "_.$_[1]._" x $ {$_[0]}
243 : "_.${$_[0]}._" x $_[1])}) ];
247 is($a, "_.yy.__.yy.__.yy._");
249 eval q[package Oscalar;
250 use overload ('.' => sub {new Oscalar ( $_[2] ?
251 "_.$_[1].__.$ {$_[0]}._"
252 : "_.$ {$_[0]}.__.$_[1]._")}) ];
256 is("b${a}c", "_._.b.__.xx._.__.c._");
258 # Check inheritance of overloading;
264 $aI = new OscalarI "$a";
265 is(ref $aI, "OscalarI");
268 is("b${aI}c", "_._.b.__.xx._.__.c._");
270 # Here we test blessing to a package updates hash
272 eval "package Oscalar; no overload '.'";
274 is("b${a}", "_.b.__.xx._");
277 is("b${a}c", "bxxc");
279 is("b${a}c", "bxxc");
281 # Negative overloading:
284 like($@, qr/no method found/);
289 sub { *{"Oscalar::$AUTOLOAD"} = sub {"_!_" . shift() . "_!_"} ;
290 goto &{"Oscalar::$AUTOLOAD"}};
292 eval "package Oscalar; sub comple; use overload '~' => 'comple'";
294 $na = eval { ~$a }; # Hash was not updated
295 like($@, qr/no method found/);
299 $na = eval { ~$a }; # Hash updated
300 warn "`$na', $@" if $@;
306 $na = eval { ~$aI }; # Hash was not updated
307 like($@, qr/no method found/);
317 eval "package Oscalar; sub rshft; use overload '>>' => 'rshft'";
319 $na = eval { $aI >> 1 }; # Hash was not updated
320 like($@, qr/no method found/);
326 $na = eval { $aI >> 1 };
332 # warn overload::Method($a, '0+'), "\n";
333 is(overload::Method($a, '0+'), \&Oscalar::numify);
334 is(overload::Method($aI,'0+'), \&Oscalar::numify);
335 ok(overload::Overloaded($aI));
336 ok(!overload::Overloaded('overload'));
338 ok(! defined overload::Method($aI, '<<'));
339 ok(! defined overload::Method($a, '<'));
341 like (overload::StrVal($aI), qr/^OscalarI=SCALAR\(0x[\da-fA-F]+\)$/);
342 is(overload::StrVal(\$aI), "@{[\$aI]}");
344 # Check overloading by methods (specified deep in the ISA tree).
348 sub Oscalar::lshft {"_<<_" . shift() . "_<<_"}
349 eval "package OscalarI; use overload '<<' => 'lshft', '|' => 'lshft'";
354 bless $aII, 'OscalarII';
355 bless \$fake, 'OscalarI'; # update the hash
356 is(($aI | 3), '_<<_xx_<<_');
358 is(($aII << 3), '_<<_087_<<_');
361 BEGIN { $int = 7; overload::constant 'integer' => sub {$int++; shift}; }
368 BEGIN { overload::constant 'integer' => sub {$int++; shift()+1}; }
377 BEGIN { $q = $qr = 7;
378 overload::constant 'q' => sub {$q++; push @q, shift, ($_[1] || 'none'); shift},
379 'qr' => sub {$qr++; push @qr, shift, ($_[1] || 'none'); shift}; }
382 $out2 = "a\a$foo,\,";
388 is($out1, 'f\'o\\o');
390 is($out2, "a\afoo,\,");
391 is("@q", "foo q f'o\\\\o q a\\a qq ,\\, qq");
393 is("@qr", "b\\b qq .\\. qq");
397 $_ = '!<b>!foo!<-.>!';
398 BEGIN { overload::constant 'q' => sub {push @q1, shift, ($_[1] || 'none'); "_<" . (shift) . ">_"},
399 'qr' => sub {push @qr1, shift, ($_[1] || 'none'); "!<" . (shift) . ">!"}; }
402 $out2 = "a\a$foo,\,";
412 s'first part'second part';
413 s/yet another/tail here/;
418 is($out1, '_<f\'o\\o>_');
419 is($out2, "_<a\a>_foo_<,\,>_");
420 is("@q1", "foo q f'o\\\\o q a\\a qq ,\\, qq oups
422 q second part q tail here s A-Z tr a-z tr");
423 is("@qr1", "b\\b qq .\\. qq try it q first part q yet another qq");
432 package symbolic; # Primitive symbolic calculator
433 use overload nomethod => \&wrap, '""' => \&str, '0+' => \&num,
434 '=' => \&cpy, '++' => \&inc, '--' => \&dec;
436 sub new { shift; bless ['n', @_] }
439 bless [@$self], ref $self;
441 sub inc { $_[0] = bless ['++', $_[0], 1]; }
442 sub dec { $_[0] = bless ['--', $_[0], 1]; }
444 my ($obj, $other, $inv, $meth) = @_;
445 if ($meth eq '++' or $meth eq '--') {
446 @$obj = ($meth, (bless [@$obj]), 1); # Avoid circular reference
449 ($obj, $other) = ($other, $obj) if $inv;
450 bless [$meth, $obj, $other];
453 my ($meth, $a, $b) = @{+shift};
454 $a = 'u' unless defined $a;
461 my %subr = ( 'n' => sub {$_[0]} );
462 foreach my $op (split " ", $overload::ops{with_assign}) {
463 $subr{$op} = $subr{"$op="} = eval "sub {shift() $op shift()}";
465 my @bins = qw(binary 3way_comparison num_comparison str_comparison);
466 foreach my $op (split " ", "@overload::ops{ @bins }") {
467 $subr{$op} = eval "sub {shift() $op shift()}";
469 foreach my $op (split " ", "@overload::ops{qw(unary func)}") {
470 $subr{$op} = eval "sub {$op shift()}";
472 $subr{'++'} = $subr{'+'};
473 $subr{'--'} = $subr{'-'};
476 my ($meth, $a, $b) = @{+shift};
477 my $subr = $subr{$meth}
478 or die "Do not know how to ($meth) in symbolic";
479 $a = $a->num if ref $a eq __PACKAGE__;
480 $b = $b->num if ref $b eq __PACKAGE__;
483 sub TIESCALAR { my $pack = shift; $pack->new(@_) }
485 sub nop { } # Around a bug
486 sub vars { my $p = shift; tie($_, $p), $_->nop foreach @_; }
495 my $foo = new symbolic 11;
497 is((sprintf "%d", $foo), '12');
498 is((sprintf "%d", $baz), '11');
501 is((sprintf "%d", $foo), '13');
502 is((sprintf "%d", $bar), '12');
503 is((sprintf "%d", $baz), '13');
506 is((sprintf "%d", $foo), '14');
507 is((sprintf "%d", $bar), '12');
508 is((sprintf "%d", $baz), '14');
509 is((sprintf "%d", $ban), '13');
512 is((sprintf "%d", $foo), '15');
513 is((sprintf "%d", $baz), '14');
514 is("$foo", '[++ [+= [++ [++ [n 11] 1] 1] 1] 1]');
518 my $iter = new symbolic 2;
519 my $side = new symbolic 1;
523 $cnt = $cnt - 1; # The "simple" way
524 $side = (sqrt(1 + $side**2) - 1)/$side;
526 my $pi = $side*(2**($iter+2));
527 is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
528 is((sprintf "%f", $pi), '3.182598');
532 my $iter = new symbolic 2;
533 my $side = new symbolic 1;
537 $side = (sqrt(1 + $side**2) - 1)/$side;
539 my $pi = $side*(2**($iter+2));
540 is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
541 is((sprintf "%f", $pi), '3.182598');
546 symbolic->vars($a, $b);
547 my $c = sqrt($a**2 + $b**2);
549 is((sprintf "%d", $c), '5');
551 is((sprintf "%d", $c), '13');
555 package symbolic1; # Primitive symbolic calculator
557 use overload nomethod => \&wrap, '""' => \&str, '0+' => \&num, '=' => \&cpy;
559 sub new { shift; bless ['n', @_] }
562 bless [@$self], ref $self;
565 my ($obj, $other, $inv, $meth) = @_;
566 if ($meth eq '++' or $meth eq '--') {
567 @$obj = ($meth, (bless [@$obj]), 1); # Avoid circular reference
570 ($obj, $other) = ($other, $obj) if $inv;
571 bless [$meth, $obj, $other];
574 my ($meth, $a, $b) = @{+shift};
575 $a = 'u' unless defined $a;
582 my %subr = ( 'n' => sub {$_[0]} );
583 foreach my $op (split " ", $overload::ops{with_assign}) {
584 $subr{$op} = $subr{"$op="} = eval "sub {shift() $op shift()}";
586 my @bins = qw(binary 3way_comparison num_comparison str_comparison);
587 foreach my $op (split " ", "@overload::ops{ @bins }") {
588 $subr{$op} = eval "sub {shift() $op shift()}";
590 foreach my $op (split " ", "@overload::ops{qw(unary func)}") {
591 $subr{$op} = eval "sub {$op shift()}";
593 $subr{'++'} = $subr{'+'};
594 $subr{'--'} = $subr{'-'};
597 my ($meth, $a, $b) = @{+shift};
598 my $subr = $subr{$meth}
599 or die "Do not know how to ($meth) in symbolic";
600 $a = $a->num if ref $a eq __PACKAGE__;
601 $b = $b->num if ref $b eq __PACKAGE__;
604 sub TIESCALAR { my $pack = shift; $pack->new(@_) }
606 sub nop { } # Around a bug
607 sub vars { my $p = shift; tie($_, $p), $_->nop foreach @_; }
616 my $foo = new symbolic1 11;
618 is((sprintf "%d", $foo), '12');
619 is((sprintf "%d", $baz), '11');
622 is((sprintf "%d", $foo), '13');
623 is((sprintf "%d", $bar), '12');
624 is((sprintf "%d", $baz), '13');
627 is((sprintf "%d", $foo), '14');
628 is((sprintf "%d", $bar), '12');
629 is((sprintf "%d", $baz), '14');
630 is((sprintf "%d", $ban), '13');
633 is((sprintf "%d", $foo), '15');
634 is((sprintf "%d", $baz), '14');
635 is("$foo", '[++ [+= [++ [++ [n 11] 1] 1] 1] 1]');
639 my $iter = new symbolic1 2;
640 my $side = new symbolic1 1;
644 $cnt = $cnt - 1; # The "simple" way
645 $side = (sqrt(1 + $side**2) - 1)/$side;
647 my $pi = $side*(2**($iter+2));
648 is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
649 is((sprintf "%f", $pi), '3.182598');
653 my $iter = new symbolic1 2;
654 my $side = new symbolic1 1;
658 $side = (sqrt(1 + $side**2) - 1)/$side;
660 my $pi = $side*(2**($iter+2));
661 is("$side", '[/ [- [sqrt [+ 1 [** [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]] 2]]] 1] [/ [- [sqrt [+ 1 [** [n 1] 2]]] 1] [n 1]]]');
662 is((sprintf "%f", $pi), '3.182598');
667 symbolic1->vars($a, $b);
668 my $c = sqrt($a**2 + $b**2);
670 is((sprintf "%d", $c), '5');
672 is((sprintf "%d", $c), '13');
676 package two_face; # Scalars with separate string and
678 sub new { my $p = shift; bless [@_], $p }
679 use overload '""' => \&str, '0+' => \&num, fallback => 1;
685 my $seven = new two_face ("vii", 7);
686 is((sprintf "seven=$seven, seven=%d, eight=%d", $seven, $seven+1),
687 'seven=vii, seven=7, eight=8');
688 is(scalar ($seven =~ /i/), '1');
693 use overload 'cmp' => \∁
694 sub new { my ($p, $v) = @_; bless \$v, $p }
695 sub comp { my ($x,$y) = @_; ($$x * 3 % 10) <=> ($$y * 3 % 10) or $$x cmp $$y }
698 my @arr = map sorting->new($_), 0..12;
699 my @sorted1 = sort @arr;
700 my @sorted2 = map $$_, @sorted1;
701 is("@sorted2", '0 10 7 4 1 11 8 5 12 2 9 6 3');
705 use overload '<>' => \&iter;
706 sub new { my ($p, $v) = @_; bless \$v, $p }
707 sub iter { my ($x) = @_; return undef if $$x < 0; return $$x--; }
710 # XXX iterator overload not intended to work with CORE::GLOBAL?
711 if (defined &CORE::GLOBAL::glob) {
717 my $iter = iterator->new(5);
720 $acc .= " $out" while $out = <${iter}>;
721 is($acc, ' 5 4 3 2 1 0');
722 $iter = iterator->new(5);
723 is(scalar <${iter}>, '5');
725 $acc .= " $out" while $out = <$iter>;
726 is($acc, ' 4 3 2 1 0');
730 use overload '%{}' => \&hderef, '&{}' => \&cderef,
731 '*{}' => \&gderef, '${}' => \&sderef, '@{}' => \&aderef;
732 sub new { my ($p, $v) = @_; bless \$v, $p }
734 my ($self, $key) = (shift, shift);
735 my $class = ref $self;
736 bless $self, 'deref::dummy'; # Disable overloading of %{}
737 my $out = $self->{$key};
738 bless $self, $class; # Restore overloading
741 sub hderef {shift->deref('h')}
742 sub aderef {shift->deref('a')}
743 sub cderef {shift->deref('c')}
744 sub gderef {shift->deref('g')}
745 sub sderef {shift->deref('s')}
748 my $deref = bless { h => { foo => 5 , fake => 23 },
749 c => sub {return shift() + 34},
755 my @cont = sort %$deref;
756 if ("\t" eq "\011") { # ASCII
757 is("@cont", '23 5 fake foo');
759 else { # EBCDIC alpha-numeric sort order
760 is("@cont", 'fake foo 23 5');
762 my @keys = sort keys %$deref;
763 is("@keys", 'fake foo');
764 my @val = sort values %$deref;
766 is($deref->{foo}, 5);
767 is(defined $deref->{bar}, '');
770 push @keys, $key while $key = each %$deref;
772 is("@keys", 'fake foo');
773 is(exists $deref->{bar}, '');
774 is(exists $deref->{foo}, 1);
778 sub xxx_goto { goto &$deref }
780 my $srt = bless { c => sub {$b <=> $a}
783 my @sorted = sort srt 11, 2, 5, 1, 22;
784 is("@sorted", '22 11 5 2 1');
788 @sorted = sort $srt 11, 2, 5, 1, 22;
789 is("@sorted", '22 11 5 2 1');
791 is("@$deref", '11 12 13');
795 is($deref->[2], '13');
799 is($deref->[$l], '12');
800 # Repeated dereference
801 my $double = bless { h => $deref,
803 is($double->{foo}, 5);
808 use overload '%{}' => \&gethash, '@{}' => sub { ${shift()} };
816 tie %h, ref $self, $self;
820 sub TIEHASH { my $p = shift; bless \ shift, $p }
823 $fields{$_} = $i++ foreach qw{zero one two three};
825 my $self = ${shift()};
826 my $key = $fields{shift()};
827 defined $key or die "Out of band access";
828 $$self->[$key] = shift;
831 my $self = ${shift()};
832 my $key = $fields{shift()};
833 defined $key or die "Out of band access";
838 my $bar = new two_refs 3,4,5,6;
849 $bar = new two_refs_o 3,4,5,6;
857 use overload '%{}' => sub { ${shift()}->[1] },
858 '@{}' => sub { ${shift()}->[0] };
864 bless \ [$a, \%h], $p;
869 tie %h, ref $self, $self;
873 sub TIEHASH { my $p = shift; bless \ shift, $p }
876 $fields{$_} = $i++ foreach qw{zero one two three};
879 my $key = $fields{shift()};
880 defined $key or die "Out of band access";
885 my $key = $fields{shift()};
886 defined $key or die "Out of band access";
891 $bar = new two_refs_o 3,4,5,6;
899 @ISA = ('two_refs1');
902 $bar = new two_refs1_o 3,4,5,6;
910 use overload bool => sub { ${+shift} };
914 { my $bbbb = 0; $aaa = bless \$bbbb, B }
924 # check that overload isn't done twice by join
927 use overload '""' => sub { $c++ };
928 my $x = join '', bless([]), 'pq', bless([]);
932 # Test module-specific warning
934 # check the Odd number of arguments for overload::constant warning
936 local $SIG{__WARN__} = sub {$a = $_[0]} ;
937 $x = eval ' overload::constant "integer" ; ' ;
939 use warnings 'overload' ;
940 $x = eval ' overload::constant "integer" ; ' ;
941 like($a, qr/^Odd number of arguments for overload::constant at/);
945 # check the `$_[0]' is not an overloadable type warning
947 local $SIG{__WARN__} = sub {$a = $_[0]} ;
948 $x = eval ' overload::constant "fred" => sub {} ; ' ;
950 use warnings 'overload' ;
951 $x = eval ' overload::constant "fred" => sub {} ; ' ;
952 like($a, qr/^`fred' is not an overloadable type at/);
956 # check the `$_[1]' is not a code reference warning
958 local $SIG{__WARN__} = sub {$a = $_[0]} ;
959 $x = eval ' overload::constant "integer" => 1; ' ;
961 use warnings 'overload' ;
962 $x = eval ' overload::constant "integer" => 1; ' ;
963 like($a, qr/^`1' is not a code reference at/);
969 use overload '""' => sub { 3+shift->[0] },
970 '0+' => sub { 10+shift->[0] },
971 'int' => sub { 100+shift->[0] };
972 sub new {my $p = shift; bless [shift], $p}
975 use overload '""' => sub { 5+shift->[0] },
976 '0+' => sub { 30+shift->[0] },
977 'int' => sub { 'ov_int1'->new(1000+shift->[0]) };
978 sub new {my $p = shift; bless [shift], $p}
981 use overload '""' => sub { 2+shift->[0] },
982 '0+' => sub { 9+shift->[0] };
983 sub new {my $p = shift; bless [shift], $p}
987 my $x = new noov_int 11;
989 main::is("$int_x", 20);
992 main::is("$int_x", 131);
995 main::is("$int_x", 1054);
998 # make sure that we don't infinitely recurse
1002 use overload '""' => sub { shift },
1003 '0+' => sub { shift },
1004 'bool' => sub { shift },
1007 # For some reason beyond me these have to be oks rather than likes.
1008 main::ok("$x" =~ /Recurse=ARRAY/);
1010 main::ok($x+0 =~ qr/Recurse=ARRAY/);
1013 # BugID 20010422.003
1017 'bool' => sub { return !$_[0]->is_zero() || undef; }
1023 return $self->{var} == 0;
1030 $self->{var} = shift;
1038 my $r = Foo->new(8);
1046 '""' => sub { return $_[0]->{var}; }
1053 $self->{var} = shift;
1060 my $utfvar = new utf8_o 200.2.1;
1061 is("$utfvar", 200.2.1); # 223 - stringify
1062 is("a$utfvar", "a".200.2.1); # 224 - overload via sv_2pv_flags
1064 # 225..227 -- more %{} tests. Hangs in 5.6.0, okay in later releases.
1065 # Basically this example implements strong encapsulation: if Hderef::import()
1066 # were to eval the overload code in the caller's namespace, the privatisation
1067 # would be quite transparent.
1069 use overload '%{}' => sub { (caller(0))[0] eq 'Foo' ? $_[0] : die "zap" };
1071 @Foo::ISA = 'Hderef';
1072 sub new { bless {}, shift }
1073 sub xet { @_ == 2 ? $_[0]->{$_[1]} :
1074 @_ == 3 ? ($_[0]->{$_[1]} = $_[2]) : undef }
1078 is ($a->xet('b'), 42);
1079 ok (!defined eval { $a->{b} });
1084 use overload '=' => sub { 42 },
1085 '++' => sub { my $x = ${$_[0]}; $_[0] };
1086 sub new { my $x = 42; bless \$x }
1090 local $SIG{__WARN__} = sub { $warn++ };
1099 my ($int, $out1, $out2);
1101 BEGIN { $int = 0; overload::constant 'integer' => sub {$int++; 17}; }
1105 is($int, 2, "#24313"); # 230
1106 is($out1, 17, "#24313"); # 231
1107 is($out2, 17, "#24313"); # 232
1112 use overload (qw(0+ numify fallback 1));
1119 sub numify { ${$_[0]} }
1124 use overload cmp => sub { 0 };
1125 package perl31793_fb;
1126 use overload cmp => sub { 0 }, fallback => 1;
1128 my $o = bless [], 'perl31793';
1129 my $of = bless [], 'perl31793_fb';
1130 my $no = bless [], 'no_overload';
1131 like(overload::StrVal(\"scalar"), qr/^SCALAR\(0x[0-9a-f]+\)$/);
1132 like(overload::StrVal([]), qr/^ARRAY\(0x[0-9a-f]+\)$/);
1133 like(overload::StrVal({}), qr/^HASH\(0x[0-9a-f]+\)$/);
1134 like(overload::StrVal(sub{1}), qr/^CODE\(0x[0-9a-f]+\)$/);
1135 like(overload::StrVal(\*GLOB), qr/^GLOB\(0x[0-9a-f]+\)$/);
1136 like(overload::StrVal(\$o), qr/^REF\(0x[0-9a-f]+\)$/);
1137 like(overload::StrVal(qr/a/), qr/^Regexp=REGEXP\(0x[0-9a-f]+\)$/);
1138 like(overload::StrVal($o), qr/^perl31793=ARRAY\(0x[0-9a-f]+\)$/);
1139 like(overload::StrVal($of), qr/^perl31793_fb=ARRAY\(0x[0-9a-f]+\)$/);
1140 like(overload::StrVal($no), qr/^no_overload=ARRAY\(0x[0-9a-f]+\)$/);
1143 # These are all check that overloaded values rather than reference addresses
1144 # are what is getting tested.
1145 my ($two, $one, $un, $deux) = map {new Numify $_} 2, 1, 1, 2;
1146 my ($ein, $zwei) = (1, 2);
1148 my %map = (one => 1, un => 1, ein => 1, deux => 2, two => 2, zwei => 2);
1149 foreach my $op (qw(<=> == != < <= > >=)) {
1150 foreach my $l (keys %map) {
1151 foreach my $r (keys %map) {
1152 my $ocode = "\$$l $op \$$r";
1153 my $rcode = "$map{$l} $op $map{$r}";
1155 my $got = eval $ocode;
1157 my $expect = eval $rcode;
1159 is ($got, $expect, $ocode) or print "# $rcode\n";
1164 # check that overloading works in regexes
1168 '""' => sub { "^$_[0][0]\$" },
1172 ? (ref $_[1] ? $_[1][0] : $_[1]) . ':' .$_[0][0]
1173 : $_[0][0] . ':' . (ref $_[1] ? $_[1][0] : $_[1])
1178 my $a = bless [ "a" ], 'Foo493';
1180 like('x:a', qr/x$a/);
1181 like('x:a:=', qr/x$a=$/);
1182 like('x:a:a:=', qr/x$a$a=$/);
1189 use overload qr => sub { qr/x/ }, fallback => 1;
1192 my $x = bless [], "QRonly";
1194 # like tries to be too clever, and decides that $x-stringified
1195 # doesn't look like a regex
1196 ok("x" =~ $x, "qr-only matches");
1197 ok("y" !~ $x, "qr-only doesn't match what it shouldn't");
1198 ok("xx" =~ /x$x/, "qr-only matches with concat");
1199 like("$x", qr/^QRonly=ARRAY/, "qr-only doesn't have string overload");
1201 my $qr = bless qr/y/, "QRonly";
1202 ok("x" =~ $qr, "qr with qr-overload uses overload");
1203 ok("y" !~ $qr, "qr with qr-overload uses overload");
1204 is("$qr", "".qr/y/, "qr with qr-overload stringify");
1207 ok("y" =~ $rx, "bare rx with qr-overload doesn't overload match");
1208 ok("x" !~ $rx, "bare rx with qr-overload doesn't overload match");
1209 is("$rx", "".qr/y/, "bare rx with qr-overload stringify");
1213 use overload qr => sub { qr/x/ }, q/""/ => sub { "y" };
1216 my $x = bless [], "QRandSTR";
1217 ok("x" =~ $x, "qr+str uses qr for match");
1218 ok("y" !~ $x, "qr+str uses qr for match");
1219 ok("xx" =~ /x$x/, "qr+str uses qr for match with concat");
1220 is("$x", "y", "qr+str uses str for stringify");
1222 my $qr = bless qr/z/, "QRandSTR";
1223 is("$qr", "y", "qr with qr+str uses str for stringify");
1224 ok("xx" =~ /x$x/, "qr with qr+str uses qr for match");
1227 ok("z" =~ $rx, "bare rx with qr+str doesn't overload match");
1228 is("$rx", "".qr/z/, "bare rx with qr+str doesn't overload stringify");
1232 use overload qr => sub { $_[0]->(@_) };
1235 use overload qr => sub { $_[0] };
1238 my $rx = bless sub { ${ qr/x/ } }, "QRany";
1239 ok("x" =~ $rx, "qr overload accepts a bare rx");
1240 ok("y" !~ $rx, "qr overload accepts a bare rx");
1242 my $str = bless sub { "x" }, "QRany";
1243 ok(!eval { "x" =~ $str }, "qr overload doesn't accept a string");
1244 like($@, qr/^Overloaded qr did not return a REGEXP/, "correct error");
1246 my $oqr = bless qr/z/, "QRandSTR";
1247 my $oqro = bless sub { $oqr }, "QRany";
1248 ok("z" =~ $oqro, "qr overload doesn't recurse");
1250 my $qrs = bless qr/z/, "QRself";
1251 ok("z" =~ $qrs, "qr overload can return self");
1255 use overload q/""/ => sub { "x" };
1258 use overload q/""/ => sub { "x" }, fallback => 1;
1261 my $fb = bless [], "STRonlyFB";
1262 ok("x" =~ $fb, "qr falls back to \"\"");
1263 ok("y" !~ $fb, "qr falls back to \"\"");
1265 my $nofb = bless [], "STRonly";
1266 ok("x" =~ $nofb, "qr falls back even without fallback");
1267 ok("y" !~ $nofb, "qr falls back even without fallback");
1272 my $twenty_three = 23;
1273 # Check that constant overloading propagates into evals
1274 BEGIN { overload::constant integer => sub { 23 } }
1275 is(eval "17", $twenty_three);
1281 bool => sub { shift->is_cool };
1284 $_[0]->{name} eq 'cool';
1289 bless $_[0], 'Brap';
1293 sub delete_with_self {
1296 bless $self, 'Brap';
1307 $obj = bless {name => 'cool'}, 'Sklorsh';
1309 ok(eval {if ($obj) {1}; 1}, $@ || 'reblessed into nonexistent namespace');
1311 $obj = bless {name => 'cool'}, 'Sklorsh';
1312 $obj->delete_with_self;
1313 ok (eval {if ($obj) {1}; 1}, $@);
1315 my $a = $b = {name => 'hot'};
1316 bless $b, 'Sklorsh';
1317 is(ref $a, 'Sklorsh');
1318 is(ref $b, 'Sklorsh');
1319 ok(!$b, "Expect overloaded boolean");
1320 ok(!$a, "Expect overloaded boolean");
1326 bool => sub { shift->{truth} eq 'yes' },
1327 '0+' => sub { shift->{truth} eq 'yes' ? '1' : '0' },
1328 '!' => sub { shift->{truth} eq 'no' },
1331 sub new { my $class = shift; bless { truth => shift }, $class }
1335 my $yes = Flrbbbbb->new('yes');
1337 $x = 1 if $yes; is($x, 1);
1338 $x = 2 unless $yes; is($x, 1);
1339 $x = 3 if !$yes; is($x, 1);
1340 $x = 4 unless !$yes; is($x, 4);
1342 my $no = Flrbbbbb->new('no');
1344 $x = 1 if $no; is($x, 0);
1345 $x = 2 unless $no; is($x, 2);
1346 $x = 3 if !$no; is($x, 3);
1347 $x = 4 unless !$no; is($x, 3);
1350 $x = 1 if !$no && $yes; is($x, 1);
1351 $x = 2 unless !$no && $yes; is($x, 1);
1352 $x = 3 if $no || !$yes; is($x, 1);
1353 $x = 4 unless $no || !$yes; is($x, 4);
1356 $x = 1 if !$no || !$yes; is($x, 1);
1357 $x = 2 unless !$no || !$yes; is($x, 1);
1358 $x = 3 if !$no && !$yes; is($x, 1);
1359 $x = 4 unless !$no && !$yes; is($x, 4);
1363 use Scalar::Util 'weaken';
1366 use overload '""' => sub {"CLiK KLAK"};
1373 $obj = bless do {my $a; \$a}, 'Shklitza';
1376 is ("$obj", "CLiK KLAK");
1377 is ("$ref", "CLiK KLAK");
1380 is ("$ref", "CLiK KLAK");
1382 bless $obj, 'Ksshfwoom';
1384 like ($obj, qr/^Ksshfwoom=/);
1385 like ($ref, qr/^Ksshfwoom=/);
1393 # bit operations have overloadable assignment variants too
1395 sub new { bless \$_[1], $_[0] }
1398 "&=" => sub { bit->new($_[0]->val . ' & ' . $_[1]->val) },
1399 "^=" => sub { bit->new($_[0]->val . ' ^ ' . $_[1]->val) },
1400 "|" => sub { bit->new($_[0]->val . ' | ' . $_[1]->val) }, # |= by fallback
1403 sub val { ${$_[0]} }
1407 my $a = bit->new(my $va = 'a');
1408 my $b = bit->new(my $vb = 'b');
1411 is($a->val, 'a & b', "overloaded &= works");
1413 my $c = bit->new(my $vc = 'c');
1416 is($b->val, 'b ^ c', "overloaded ^= works");
1418 my $d = bit->new(my $vd = 'd');
1421 is($c->val, 'c | d', "overloaded |= (by fallback) works");
1425 # comparison operators with nomethod (bug 41546)
1429 package nomethod_false;
1430 use overload nomethod => sub { $method = 'nomethod'; 0 };
1432 package nomethod_true;
1433 use overload nomethod => sub { $method= 'nomethod'; 'true' };
1437 local $SIG{__WARN__} = sub { $warning = $_[0] };
1439 my $f = bless [], 'nomethod_false';
1440 ($warning, $method) = ("", "");
1441 is($f eq 'whatever', 0, 'nomethod makes eq return 0');
1442 is($method, 'nomethod');
1444 my $t = bless [], 'nomethod_true';
1445 ($warning, $method) = ("", "");
1446 is($t eq 'whatever', 'true', 'nomethod makes eq return "true"');
1447 is($method, 'nomethod');
1448 is($warning, "", 'nomethod eq need not return number');
1451 package nomethod_false;
1452 use overload cmp => sub { $method = 'cmp'; 0 };
1454 $f = bless [], 'nomethod_false';
1455 ($warning, $method) = ("", "");
1456 ok($f eq 'whatever', 'eq falls back to cmp (nomethod not called)');
1460 package nomethod_true;
1461 use overload cmp => sub { $method = 'cmp'; 'true' };
1463 $t = bless [], 'nomethod_true';
1464 ($warning, $method) = ("", "");
1465 ok($t eq 'whatever', 'eq falls back to cmp (nomethod not called)');
1467 like($warning, qr/isn't numeric/, 'cmp should return number');
1472 # nomethod called for '!' after attempted fallback
1473 my $nomethod_called = 0;
1475 package nomethod_not;
1476 use overload nomethod => sub { $nomethod_called = 'yes'; };
1479 my $o = bless [], 'nomethod_not';
1482 is($nomethod_called, 'yes', "nomethod() is called for '!'");
1483 is($res, 'yes', "nomethod(..., '!') return value propagates");
1487 # Subtle bug pre 5.10, as a side effect of the overloading flag being
1488 # stored on the reference rather than the referent. Despite the fact that
1489 # objects can only be accessed via references (even internally), the
1490 # referent actually knows that it's blessed, not the references. So taking
1491 # a new, unrelated, reference to it gives an object. However, the
1492 # overloading-or-not flag was on the reference prior to 5.10, and taking
1493 # a new reference didn't (use to) copy it.
1497 use overload '""' => sub {${$_[0]}};
1500 return "$_[0], $_[1]";
1507 my $crunch_eth = bless \$string, $class;
1509 is("$crunch_eth", $string);
1510 is ($crunch_eth->Pie("Meat"), "$string, Meat");
1512 my $wham_eth = \$string;
1514 is("$wham_eth", $string,
1515 'This reference did not have overloading in 5.8.8 and earlier');
1516 is ($crunch_eth->Pie("Apple"), "$string, Apple");
1518 my $class = ref $wham_eth;
1521 # Bless it back into its own class!
1522 bless $wham_eth, $class;
1524 is("$wham_eth", $string);
1525 is ($crunch_eth->Pie("Blackbird"), "$string, Blackbird");
1530 use overload "0+" => sub { $_[0][0] += 1; 42 };
1531 package numify_self;
1532 use overload "0+" => sub { $_[0][0]++; $_[0] };
1533 package numify_other;
1534 use overload "0+" => sub { $_[0][0]++; $_[0][1] = bless [], 'numify_int' };
1535 package numify_by_fallback;
1536 use overload fallback => 1;
1539 my $o = bless [], 'numify_int';
1540 is(int($o), 42, 'numifies to integer');
1541 is($o->[0], 1, 'int() numifies only once');
1544 my $num_val = int($aref);
1545 my $r = bless $aref, 'numify_self';
1546 is(int($r), $num_val, 'numifies to self');
1547 is($r->[0], 1, 'int() numifies once when returning self');
1549 my $s = bless [], 'numify_other';
1550 is(int($s), 42, 'numifies to numification of other object');
1551 is($s->[0], 1, 'int() numifies once when returning other object');
1552 is($s->[1][0], 1, 'returned object numifies too');
1554 my $m = bless $aref, 'numify_by_fallback';
1555 is(int($m), $num_val, 'numifies to usual reference value');
1556 is(abs($m), $num_val, 'numifies to usual reference value');
1557 is(-$m, -$num_val, 'numifies to usual reference value');
1558 is(0+$m, $num_val, 'numifies to usual reference value');
1559 is($m+0, $num_val, 'numifies to usual reference value');
1560 is($m+$m, 2*$num_val, 'numifies to usual reference value');
1561 is(0-$m, -$num_val, 'numifies to usual reference value');
1562 is(1*$m, $num_val, 'numifies to usual reference value');
1563 is(int($m/1), $num_val, 'numifies to usual reference value');
1564 is($m%100, $num_val%100, 'numifies to usual reference value');
1565 is($m**1, $num_val, 'numifies to usual reference value');
1567 is(abs($aref), $num_val, 'abs() of ref');
1568 is(-$aref, -$num_val, 'negative of ref');
1569 is(0+$aref, $num_val, 'ref addition');
1570 is($aref+0, $num_val, 'ref addition');
1571 is($aref+$aref, 2*$num_val, 'ref addition');
1572 is(0-$aref, -$num_val, 'subtraction of ref');
1573 is(1*$aref, $num_val, 'multiplicaton of ref');
1574 is(int($aref/1), $num_val, 'division of ref');
1575 is($aref%100, $num_val%100, 'modulo of ref');
1576 is($aref**1, $num_val, 'exponentiation of ref');
1580 package CopyConstructorFallback;
1582 '++' => sub { "$_[0]"; $_[0] },
1584 sub new { bless {} => shift }
1588 my $o = CopyConstructorFallback->new;
1589 my $x = $o++; # would segfault
1591 is($x, $o, "copy constructor falls back to assignment (postinc)");
1592 is($y, $o, "copy constructor falls back to assignment (preinc)");
1595 # only scalar 'x' should currently overload
1603 'x' => sub { $x++; 1 },
1604 '0+' => sub { $n++; 1 },
1605 'nomethod' => sub { $nm++; 1 },
1616 ($x,$n,$nm) = (0,0,0);
1617 @a = ((1,2,$s) x $count);
1618 is("$x-$n-$nm", "0-0-0", 'repeat 1');
1620 ($x,$n,$nm) = (0,0,0);
1621 @a = ((1,$s,3) x $count);
1622 is("$x-$n-$nm", "0-0-0", 'repeat 2');
1624 ($x,$n,$nm) = (0,0,0);
1625 @a = ((1,2,3) x $s);
1626 is("$x-$n-$nm", "0-1-0", 'repeat 3');
1631 # RT #57012: magic items need to have mg_get() called before testing for
1632 # overload. Lack of this means that overloaded values returned by eg a
1633 # tied array didn't call overload methods.
1634 # We test here both a tied array and scalar, since the implementation of
1635 # tied arrays (and hashes) is such that in rvalue context, mg_get is
1636 # called prior to executing the op, while it isn't for a tied scalar.
1637 # We also check that return values are correctly tainted.
1638 # We try against two overload packages; one has all expected methods, the
1639 # other uses only fallback methods.
1643 # @tests holds a list of test cases. Each elem is an array ref with
1644 # the following entries:
1646 # * the value that the overload method should return
1648 # * the expression to be evaled. %s is replaced with the
1649 # variable being tested ($ta[0], $ts, or $plain)
1651 # * a string listing what functions we expect to be called.
1652 # Each method appends its name in parentheses, so "(=)(+)" means
1653 # we expect the copy constructor and then the add method to be
1656 # * like above, but what should be called for the fallback-only test
1657 # (in this case, nomethod() identifies itself as "(NM:*)" where *
1658 # is the op). If this value is undef, fallback tests are skipped.
1660 # * An array ref of expected counts of calls to FETCH/STORE.
1661 # The first three values are:
1662 # 1. the expected number of FETCHs for a tied array
1663 # 2. the expected number of FETCHs for a tied scalar
1664 # 3. the expected number of STOREs
1665 # If there are a further three elements present, then
1666 # these represent the expected counts for the fallback
1667 # version of the tests. If absent, they are assumed to
1668 # be the same as for the full method test
1670 # * Under the taint version of the tests, whether we expect
1671 # the result to be tainted (for example comparison ops
1672 # like '==' don't return a tainted value, even if their
1681 # A note on what methods to expect to be called, and
1682 # how many times FETCH/STORE is called:
1684 # Mutating ops (+=, ++ etc) trigger a copy ('='), since
1685 # the code can't distingish between something that's been copied:
1686 # $a = foo->new(0); $b = $a; refcnt($$b) == 2
1687 # and overloaded objects stored in ties which will have extra
1688 # refcounts due to the tied_obj magic and entries on the tmps
1689 # stack when returning from FETCH etc. So we always copy.
1691 # This accounts for a '=', and an extra STORE.
1692 # We also have a FETCH returning the final value from the eval,
1693 # plus a FETCH in the overload subs themselves: ($_[0][0])
1694 # triggers one. However, tied agregates have a mechanism to prevent
1695 # multiple fetches between STOREs, which means that the tied
1696 # hash skips doing a FETCH during '='.
1698 for (qw(+ - * / % ** << >> & | ^)) {
1700 $op = '%%' if $op eq '%';
1701 my $e = "%s $op= 3";
1703 # ARRAY FETCH: initial, sub+=, eval-return,
1704 # SCALAR FETCH: initial, sub=, sub+=, eval-return,
1705 # STORE: copy, mutator
1706 push @tests, [ 18, $e, "(=)($_=)", "(=)(NM:$_=)", [ 3, 4, 2 ], 1 ];
1709 "do { my \$arg = %s; \$_[2] ? (3 $op \$arg) : (\$arg $op 3) }";
1710 # ARRAY FETCH: initial
1711 # SCALAR FETCH: initial eval-return,
1712 push @tests, [ 18, "%s $op 3", "($_)", "(NM:$_)", [ 1, 2, 0 ], 1 ];
1713 push @tests, [ 18, "3 $op %s", "($_)", "(NM:$_)", [ 1, 2, 0 ], 1 ];
1716 # these use string fallback rather than nomethod
1719 my $e = "%s $op= 3";
1722 # ARRAY FETCH: initial, sub+=, eval-return,
1723 # SCALAR FETCH: initial, sub=, sub+=, eval-return,
1724 # STORE: copy, mutator
1725 # for fallback, we just stringify, so eval-return and copy skipped
1727 push @tests, [ 18, $e, "(=)($_=)", '("")',
1728 [ 3, 4, 2, 2, 3, 1 ], 1 ];
1731 "do { my \$arg = %s; \$_[2] ? (3 $op \$arg) : (\$arg $op 3) }";
1732 # ARRAY FETCH: initial
1733 # SCALAR FETCH: initial eval-return,
1734 # with fallback, we just stringify, so eval-return skipped,
1735 # but an extra FETCH happens in sub"", except for 'x',
1736 # which passes a copy of the RV to sub"", avoiding the
1739 push @tests, [ 18, "%s $op 3", "($_)", '("")',
1740 [ 1, 2, 0, 1, ($_ eq '.' ? 2 : 1), 0 ], 1 ];
1741 next if $_ eq 'x'; # repeat only overloads on LHS
1742 push @tests, [ 18, "3 $op %s", "($_)", '("")',
1743 [ 1, 2, 0, 1, 2, 0 ], 1 ];
1751 # ARRAY FETCH: initial, sub+=, eval-return,
1752 # SCALAR FETCH: initial, sub=, sub+=, eval-return,
1753 # STORE: copy, mutator
1754 [ 18, $pre, "(=)($_)(\"\")", "(=)(NM:$_)(\"\")", [ 3, 4, 2 ], 1 ],
1755 # ARRAY FETCH: initial, sub+=
1756 # SCALAR FETCH: initial, sub=, sub+=
1757 # STORE: copy, mutator
1758 [ 18, $post, "(=)($_)(\"\")", "(=)(NM:$_)(\"\")", [ 2, 3, 2 ], 1 ];
1761 # For the non-mutator ops, we have a initial FETCH,
1762 # an extra FETCH within the sub itself for the scalar option,
1765 for (qw(< <= > >= == != lt le gt ge eq ne)) {
1768 push @tests, [ 3, $e, "($_)", "(NM:$_)", [ 1, 2, 0 ], 0 ];
1773 push @tests, [ 3, $e, "($_)", "(NM:$_)", [ 1, 2, 0 ], 1 ];
1778 push @tests, [ 18, $e, "($_)", "(NM:$_)", [ 1, 2, 0 ], 1 ];
1780 for (qw(cos sin exp abs log sqrt int ~)) {
1783 push @tests, [ 1.23, $e, "($_)",
1784 ($_ eq 'int' ? '(0+)' : "(NM:$_)") , [ 1, 2, 0 ], 1 ];
1789 push @tests, [ 1.23, $e, "($_)", '(0+)', [ 1, 2, 0 ], 0 ];
1794 push @tests, [ 18, $e, '(neg)', '(NM:neg)', [ 1, 2, 0 ], 1 ];
1796 my $e = '(%s) ? 1 : 0';
1798 push @tests, [ 18, $e, '(bool)', '(0+)', [ 1, 2, 0 ], 0 ];
1800 # note: this is testing unary qr, not binary =~
1801 $subs{qr} = '(qr/%s/)';
1802 push @tests, [ "abc", '"abc" =~ (%s)', '(qr)', '("")', [ 1, 2, 0 ], 0 ];
1804 $e = '"abc" ~~ (%s)';
1806 push @tests, [ "abc", $e, '(~~)', '(NM:~~)', [ 1, 1, 0 ], 0 ];
1808 $subs{'-X'} = 'do { my $f = (%s);'
1809 . '$_[1] eq "r" ? (-r ($f)) :'
1810 . '$_[1] eq "e" ? (-e ($f)) :'
1811 . '$_[1] eq "f" ? (-f ($f)) :'
1812 . '$_[1] eq "l" ? (-l ($f)) :'
1813 . '$_[1] eq "t" ? (-t ($f)) :'
1814 . '$_[1] eq "T" ? (-T ($f)) : 0;}';
1815 # Note - we don't care what these filetests return, as
1816 # long as the tied and untied versions return the same value.
1817 # The flags below are chosen to test all uses of tryAMAGICftest_MG
1818 for (qw(r e f l t T)) {
1819 push @tests, [ 'TEST', "-$_ (%s)", '(-X)', '("")', [ 1, 2, 0 ], 0 ];
1822 $subs{'${}'} = '%s';
1823 push @tests, [ do {my $s=99; \$s}, '${%s}', '(${})', undef, [ 1, 1, 0 ], 0 ];
1825 # we skip testing '@{}' here because too much of this test
1826 # framework involves array dereferences!
1828 $subs{'%{}'} = '%s';
1829 push @tests, [ {qw(a 1 b 2 c 3)}, 'join "", sort keys %%{%s}',
1830 '(%{})', undef, [ 1, 2, 0 ], 0 ];
1832 $subs{'&{}'} = '%s';
1833 push @tests, [ sub {99}, 'do {&{%s} for 1,2}',
1834 '(&{})(&{})', undef, [ 2, 2, 0 ], 0 ];
1838 $subs{'*{}'} = '%s';
1839 push @tests, [ \*RT57012A, '*RT57012B = *{%s}; our $RT57012B',
1840 '(*{})', undef, [ 1, 1, 0 ], 0 ];
1844 # eval should do tie, overload on its arg before checking taint */
1845 push @tests, [ '1;', 'eval q(eval %s); $@ =~ /Insecure/',
1846 '("")', '("")', [ 1, 2, 0 ], 0 ];
1849 for my $sub (keys %subs) {
1850 my $term = $subs{$sub};
1851 my $t = sprintf $term, '$_[0][0]';
1852 my $e ="sub { \$funcs .= '($sub)'; my \$r; if (\$use_int) {"
1853 . "use integer; \$r = ($t) } else { \$r = ($t) } \$r }";
1854 $subs{$sub} = eval $e;
1855 die "Compiling sub gave error:\n<$e>\n<$@>\n" if $@;
1866 "=" => sub { $funcs .= '(=)'; bless [ $_[0][0] ] },
1867 '0+' => sub { $funcs .= '(0+)'; 0 + $_[0][0] },
1868 '""' => sub { $funcs .= '("")'; "$_[0][0]" },
1871 package RT57012_OV_FB; # only contains fallback conversion functions
1874 "=" => sub { $funcs .= '(=)'; bless [ $_[0][0] ] },
1875 '0+' => sub { $funcs .= '(0+)'; 0 + $_[0][0] },
1876 '""' => sub { $funcs .= '("")'; "$_[0][0]" },
1878 $funcs .= "(NM:$_[3])";
1879 my $e = defined($_[1])
1882 ? "atan2(\$_[1],\$_[0][0])"
1883 : "atan2(\$_[0][0],\$_[1])"
1885 ? "\$_[1] $_[3] \$_[0][0]"
1886 : "\$_[0][0] $_[3] \$_[1]"
1889 : "$_[3](\$_[0][0])";
1892 use integer; $r = eval $e;
1897 ::diag("eval of nomethod <$e> gave <$@>") if $@;
1903 package RT57012_TIE_S;
1906 sub TIESCALAR { bless [ bless [ $tie_val ], $_[1] ] }
1907 sub FETCH { $fetches++; $_[0][0] }
1908 sub STORE { $stores++; $_[0][0] = $_[1] }
1910 package RT57012_TIE_A;
1912 sub TIEARRAY { bless [] }
1913 sub FETCH { $fetches++; $_[0][0] }
1914 sub STORE { $stores++; $_[0][$_[1]] = $_[2] }
1918 for my $test (@tests) {
1919 my ($val, $sub_term, $exp_funcs, $exp_fb_funcs,
1920 $exp_counts, $exp_taint) = @$test;
1924 # create tainted version of $val (unless its a ref)
1925 my $t = substr($^X,0,0);
1927 my $val1 = $val; # use a copy to avoid stringifying original
1928 $tainted_val = ref($val1) ? $val :
1929 ($val1 =~ /^[\d\.]+$/) ? $val+$t0 : $val.$t;
1931 $tie_val = $tainted_val;
1933 for my $int ('', 'use integer; ') {
1934 $use_int = ($int ne '');
1935 my $plain = $tainted_val;
1936 my $plain_term = $int . sprintf $sub_term, '$plain';
1937 my $exp = eval $plain_term;
1938 diag("eval of plain_term <$plain_term> gave <$@>") if $@;
1939 is(tainted($exp), $exp_taint,
1940 "<$plain_term> taint of expected return");
1942 for my $ov_pkg (qw(RT57012_OV RT57012_OV_FB)) {
1943 # the deref ops don't support fallback
1944 next if $ov_pkg eq 'RT57012_OV_FB'
1945 and not defined $exp_fb_funcs;
1946 my ($exp_fetch_a, $exp_fetch_s, $exp_store) =
1947 ($ov_pkg eq 'RT57012_OV' || @$exp_counts < 4)
1948 ? @$exp_counts[0,1,2]
1949 : @$exp_counts[3,4,5];
1951 tie my $ts, 'RT57012_TIE_S', $ov_pkg;
1952 tie my @ta, 'RT57012_TIE_A';
1953 $ta[0] = bless [ $tainted_val ], $ov_pkg;
1954 my $oload = bless [ $tainted_val ], $ov_pkg;
1956 for my $var ('$ta[0]', '$ts', '$oload') {
1962 my $res_term = $int . sprintf $sub_term, $var;
1963 my $desc = "<$res_term> $ov_pkg" ;
1964 my $res = eval $res_term;
1965 diag("eval of res_term $desc gave <$@>") if $@;
1966 # uniquely, the inc/dec ops return tthe original
1967 # ref rather than a copy, so stringify it to
1968 # find out if its tainted
1969 $res = "$res" if $res_term =~ /\+\+|--/;
1970 is(tainted($res), $exp_taint,
1971 "$desc taint of result return");
1972 is($res, $exp, "$desc return value");
1973 my $fns =($ov_pkg eq 'RT57012_OV_FB')
1974 ? $exp_fb_funcs : $exp_funcs;
1975 if ($var eq '$oload' && $res_term !~ /oload(\+\+|--)/) {
1976 # non-tied overloading doesn't trigger a copy
1977 # except for post inc/dec
1980 is($funcs, $fns, "$desc methods called");
1981 next if $var eq '$oload';
1982 my $exp_fetch = ($var eq '$ts') ?
1983 $exp_fetch_s : $exp_fetch_a;
1984 is($fetches, $exp_fetch, "$desc FETCH count");
1985 is($stores, $exp_store, "$desc STORE count");
1994 # Test overload from the main package
1996 '$^W = 1; use overload q\""\ => sub {"ning"}; print bless []',
1998 { switches => ['-wl'], stderr => 1 },
1999 'use overload from the main package'
2003 package blessed_methods;
2004 use overload '+' => sub {};
2005 bless overload::Method __PACKAGE__,'+';
2006 eval { overload::Method __PACKAGE__,'+' };
2007 ::is($@, '', 'overload::Method and blessed overload methods');
2011 # fallback to 'cmp' and '<=>' with heterogeneous operands
2013 my $not_found = 'no method found';
2018 bless \$n, ref $_[0] || $_[0];
2022 (${$_[0]} <=> ${$_[1]}) * ($_[2] ? -1 : 1);
2027 use overload '<=>' => 'cmp';
2031 use overload 'cmp' => 'cmp';
2034 my $n = NCmp->new(5);
2035 my $s = SCmp->new(3);
2038 eval { $res = $n > $s; };
2039 $res = $not_found if $@ =~ /$not_found/;
2040 is($res, 1, 'A>B using A<=> when B overloaded, no B<=>');
2042 eval { $res = $s < $n; };
2043 $res = $not_found if $@ =~ /$not_found/;
2044 is($res, 1, 'A<B using B<=> when A overloaded, no A<=>');
2046 eval { $res = $s lt $n; };
2047 $res = $not_found if $@ =~ /$not_found/;
2048 is($res, 1, 'A lt B using A:cmp when B overloaded, no B:cmp');
2050 eval { $res = $n gt $s; };
2051 $res = $not_found if $@ =~ /$not_found/;
2052 is($res, 1, 'A gt B using B:cmp when A overloaded, no A:cmp');
2054 my $o = NCmp->new(9);
2056 is($used, \$n, 'A < B uses <=> from A in preference to B');
2058 my $t = SCmp->new(7);
2060 is($used, \$s, 'A lt B uses cmp from A in preference to B');
2064 # Combinatorial testing of 'fallback' and 'nomethod'
2067 use overload '0+' => sub { ${$_[0]}; },
2071 my $n = @_ ? shift : 0;
2072 bless my $obj = \$n, ref $self || $self;
2076 my $s = "(${$_[0]} ";
2077 $s .= "nomethod, " if defined ${ref($_[0]).'::(nomethod'};
2078 my $fb = ${ref($_[0]).'::()'};
2079 $s .= "fb=" . (defined $fb ? 0 + $fb : 'undef') . ")";
2081 sub nomethod { "${$_[0]}.nomethod"; }
2083 # create classes for tests
2085 my @falls = (0, 'undef', 1);
2086 my @nomethods = ('', 'nomethod');
2087 my $not_found = 'no method found';
2088 for my $fall (@falls) {
2089 for my $nomethod (@nomethods) {
2090 my $nomethod_decl = $nomethod
2091 ? $nomethod . "=>'nomethod'," : '';
2093 package NuMB$fall$nomethod;
2095 use overload $nomethod_decl
2101 # operation and precedence of 'fallback' and 'nomethod'
2102 # for all combinations with 2 overloaded operands
2103 for my $nomethod2 (@nomethods) {
2104 for my $nomethod1 (@nomethods) {
2105 for my $fall2 (@falls) {
2106 my $pack2 = "NuMB$fall2$nomethod2";
2107 for my $fall1 (@falls) {
2108 my $pack1 = "NuMB$fall1$nomethod1";
2109 my ($test, $out, $exp);
2111 my \$x = $pack1->new(2);
2112 my \$y = $pack2->new(3);
2113 \$test = "\$x" . ' * ' . "\$y";
2116 $out = $not_found if $@ =~ /$not_found/;
2117 $exp = $nomethod1 ? '2.nomethod' :
2118 $nomethod2 ? '3.nomethod' :
2119 $fall1 eq '1' && $fall2 eq '1' ? 6
2121 is($out, $exp, "$test --> $exp");
2127 # operation of 'fallback' and 'nomethod'
2128 # where the other operand is not overloaded
2129 for my $nomethod (@nomethods) {
2130 for my $fall (@falls) {
2131 my ($test, $out, $exp);
2133 my \$x = NuMB$fall$nomethod->new(2);
2134 \$test = "\$x" . ' * 3';
2137 $out = $not_found if $@ =~ /$not_found/;
2138 $exp = $nomethod ? '2.nomethod' :
2141 is($out, $exp, "$test --> $exp");
2144 my \$x = NuMB$fall$nomethod->new(2);
2145 \$test = '3 * ' . "\$x";
2148 $out = $not_found if $@ =~ /$not_found/;
2149 is($out, $exp, "$test --> $exp");