16 print "not " unless $a->isa("Bob");
30 $Alice::VERSION = 2.718;
48 sub test { print "not " unless shift; print "ok $i\n"; $i++; }
52 test $a->isa("Alice");
56 test $a->isa("Female");
58 test $a->isa("Human");
60 test ! $a->isa("Male");
62 test ! $a->isa('Programmer');
64 test $a->can("drink");
68 test ! $a->can("sleep");
70 test (!Cedric->isa('Programmer'));
72 test (Cedric->isa('Human'));
74 push(@Cedric::ISA,'Programmer');
76 test (Cedric->isa('Programmer'));
80 base::->import('Programmer');
83 test $a->isa('Programmer');
84 test $a->isa("Female");
86 @Cedric::ISA = qw(Bob);
88 test (!Cedric->isa('Programmer'));
91 my @refs = qw(SCALAR SCALAR LVALUE GLOB ARRAY HASH CODE);
92 my @vals = ( \$b, \3.14, \substr($b,1,1), \*b, [], {}, sub {} );
93 for ($p=0; $p < @refs; $p++) {
94 for ($q=0; $q < @vals; $q++) {
95 test UNIVERSAL::isa($vals[$p], $refs[$q]) eq ($p==$q or $p+$q==1);
99 test ! UNIVERSAL::can(23, "can");
101 test $a->can("VERSION");
104 test ! $a->can("export_tags"); # a method in Exporter
106 test (eval { $a->VERSION }) == 2.718;
108 test ! (eval { $a->VERSION(2.719) }) &&
109 $@ =~ /^Alice version 2.71(?:9|8999\d+) required--this is only version 2.718 at /;
111 test (eval { $a->VERSION(2.718) }) && ! $@;
113 my $subs = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
115 test $subs eq "can isa VERSION";
117 test $subs eq "VERSION can isa";
120 test $a->isa("UNIVERSAL");
122 test ! UNIVERSAL::isa([], "UNIVERSAL");
124 test ! UNIVERSAL::can({}, "can");
126 test UNIVERSAL::isa(Alice => "UNIVERSAL");
128 test UNIVERSAL::can(Alice => "can") == \&UNIVERSAL::can;
130 # now use UNIVERSAL.pm and see what changes
131 eval "use UNIVERSAL";
133 test $a->isa("UNIVERSAL");
135 my $sub2 = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
136 # XXX import being here is really a bug
138 test $sub2 eq "can import isa VERSION";
140 test $sub2 eq "VERSION can import isa";
143 eval 'sub UNIVERSAL::sleep {}';
144 test $a->can("sleep");
146 test ! UNIVERSAL::can($b, "can");
148 test ! $a->can("export_tags"); # a method in Exporter
150 test ! UNIVERSAL::isa("\xff\xff\xff\0", 'HASH');