13 is(length($foo), undef);
16 is(unpack('C',$foo), 1);
19 is(vec($foo,20,1), 0);
21 is(vec($foo,20,1), 1);
25 is(vec($foo,1,8), 0xf1);
26 is((unpack('C',substr($foo,1,1)) & 255), 0xf1);
27 is(vec($foo,2,4), 1);;
28 is(vec($foo,3,4), 15);
29 vec($Vec, 0, 32) = 0xbaddacab;
30 is($Vec, "\xba\xdd\xac\xab");
31 is(vec($Vec, 0, 32), 3135089835);
33 # ensure vec() handles numericalness correctly
34 $foo = $bar = $baz = 0;
35 vec($foo = 0,0,1) = 1;
36 vec($bar = 0,1,1) = 1;
38 ok($foo eq "1" && $foo == 1);
39 ok($bar eq "2" && $bar == 2);
40 ok("$foo $bar $baz" eq "1 2 3");
44 $x = eval { vec $foo, 0, 3 };
45 like($@, qr/^Illegal number of bits in vec/);
47 $x = eval { vec $foo, 0, 0 };
48 like($@, qr/^Illegal number of bits in vec/);
50 $x = eval { vec $foo, 0, -13 };
51 like($@, qr/^Illegal number of bits in vec/);
53 $x = eval { vec($foo, -1, 4) = 2 };
54 like($@, qr/^Negative offset to vec in lvalue context/);
56 ok(! vec('abcd', 7, 8));
59 # N.B. currently curiously coded to circumvent bugs elswhere in UTF8 handling
61 $foo = "\x{100}" . "\xff\xfe";
63 is(vec($x, 0, 8), 255);
65 eval { vec($foo, 1, 8) };
68 eval { vec($foo, 1, 8) = 13 };
71 is($foo, "\x8c\x0d\xff\x8a\x69");
74 is($foo, "\xc4\x0d\xc3\xbf\xc3\xbe");
76 $foo = "\x{100}" . "\xff\xfe";
83 $foo = "\x61\x62\x63\x64\x65\x66";
84 is(vec(substr($foo, 2, 2), 0, 16), 25444);
85 vec(substr($foo, 1,3), 5, 4) = 3;
86 is($foo, "\x61\x62\x63\x34\x65\x66");
88 # A variation of [perl #20933]
94 $r[$_] = \ vec $s, $_, 1 for (0, 1);
95 ok(!(${ $r[0] } != 0 || ${ $r[1] } != 1));
100 { package Class; DESTROY { ++$destroyed; } }
106 $x = bless({}, 'Class');
108 is($destroyed, 1, 'Timely scalar destruction with lvalue vec');
110 use constant roref => \1;
111 eval { for (roref) { vec($_,0,1) = 1 } };
112 like($@, qr/^Modification of a read-only value attempted at /,
113 'err msg when modifying read-only refs');
117 # downgradeable utf8 strings should be downgraded before accessing
119 # See the p5p thread with Message-ID:
120 # <CAMx+QJ6SAv05nmpnc7bmp0Wo+sjcx=ssxCcE-P_PZ8HDuCQd9A@mail.gmail.com>
123 my $x = substr "\x{100}\xff\xfe", 1; # a utf8 string with all ords < 256
126 is($v, 255, "downgraded utf8 try 1");
128 is($v, 255, "downgraded utf8 try 2");