调用属性的 writer 方法的引用时出现 Perl Moose 异常

Question

我试图将对属性的 writer 方法的引用传递给另一个类方法。显然，自从执行 print 语句后就调用了 setter 方法。但是，会出现以下错误结果:

Attribute (dir) is required, so cannot be set to undef at Test.pm line 51
Test::_validateDir('Test=HASH(0x2270be0)', 'CODE(0x22a90f8)') called at test.pm line 37
Test::BUILD('test_moose=HASH(0x2270be0)', 'HASH(0x1879728)') called at generated method (unknown origin) line 50
Test:new('Test', dir=>'my_bin') called at ./test_moose.pl line 26

是否存在无法引用生成的编写器方法的原因，或者是否有不同或更好的方法在 Moose 中执行此操作？

代码如下:

package Test;
use Moose;
use File::Spec;

has 'dir' => (is => 'ro', isa => 'Str', required => 1, writer '_set_dir',);

sub BUILD {
    my ($self, $hr) = @_;
    $self->_validateDir(\&_set_dir);
}

sub _validate_dir {
    my ($self, $setter) = @_;
    my $dir = File::Spec->rel2abs($self->dir, '/home/me');
    if (! -e $dir) {
       print "creating directory\n";
       #create directory
    }
    &$setter($dir);
}

Answer 1

将二传手作为常规替补来调用是否正确？您不应该将 $self 作为第一个参数传递吗？