我如何在Perl中使用`lock_hash_recurse`? [英] How do I use `lock_hash_recurse` in Perl?
问题描述
继续讨论这里,我对 lock_hash_recurse
存在一些麻烦,如下图所示:
#!/ usr / bin / perl
use strict;
使用警告;
使用Data :: Dumper;
使用Hash :: Util qw(lock_keys);
my $ hashref = {A => 1,B => {CC => 22,DD => 33}};
lock_keys(%{$ hashref}); #这是好
Hash :: Util :: lock_hash_recurse(%{$ hashref}); #失败:在/usr/lib/perl/5.10/Hash/Util.pm第153行的字符串eq中使用未初始化的值。
据我所知, reftype
返回 undef
...是 lock_hash_recurse
中的一个错误(也许这就是为什么它不被导出的原因......)
它是 Hash :: Util
中的一个错误。该代码表示:
$ $ p $ code> sub lock_hashref_recurse {
my $ hash = shift;
lock_ref_keys($ hash);
foreach my $ value(values%$ hash){
if(reftype($ value); eq'HASH'){
lock_hashref_recurse($ value);
}
内部:: SvREADONLY($ value,1);
}
return $ hash
}
但应该是:
sub lock_hashref_recurse {
my $ hash = shift;
lock_ref_keys($ hash);
foreach my $ value(values%$ hash){
my $ type = reftype($ value);
if(defined $ type and $ type eq'HASH'){
lock_hashref_recurse($ value);
}
内部:: SvREADONLY($ value,1);
}
return $ hash
}
问题是 Scalar :: Util :: reftype
返回 undef
,不是空字符串。补丁已发送到p5p。它看起来不像 Hash :: Util
是一个双核(CPAN)核心模块,所以你必须升级到Perl 5版本固定。我建议你自己修补代码或编写你自己的版本。
如果你编写自己的版本,不要使用Internals :: SvREADONLY(用户级别的东西不应该使用内部元素
包中的内容)。使用 Readonly :: XS
模块。
In continue to the discussion here, I'm havind some trouble with lock_hash_recurse
as illustrated below:
#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
use Hash::Util qw (lock_keys);
my $hashref = {A=>1, B=>{CC=>22, DD=>33}};
lock_keys(%{$hashref}); # this is OK
Hash::Util::lock_hash_recurse(%{$hashref}); # this fails: "Use of uninitialized value in string eq at /usr/lib/perl/5.10/Hash/Util.pm line 153."
From what I can tell, reftype
returns undef
... is that a bug in lock_hash_recurse
(maybe that's why it isn't exported?...)
It is a bug in Hash::Util
. The code says:
sub lock_hashref_recurse {
my $hash = shift;
lock_ref_keys($hash);
foreach my $value (values %$hash) {
if (reftype($value); eq 'HASH') {
lock_hashref_recurse($value);
}
Internals::SvREADONLY($value,1);
}
return $hash
}
but should be:
sub lock_hashref_recurse {
my $hash = shift;
lock_ref_keys($hash);
foreach my $value (values %$hash) {
my $type = reftype($value);
if (defined $type and $type eq 'HASH') {
lock_hashref_recurse($value);
}
Internals::SvREADONLY($value,1);
}
return $hash
}
The problem is that Scalar::Util::reftype
returns undef
, not an empty string. A patch has been sent to p5p. It doesn't look like Hash::Util
is a dual-life (in core and CPAN) module, so you would have to upgrade to a version of Perl 5 with it fixed. I would suggest either patching the code yourself or writing your own version.
If you write your own version, do not use Internals::SvREADONLY (user level stuff shouldn't use the stuff in the Internals
package). Use the Readonly::XS
module instead.
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