如何在Perl中强制将对象属性设置为完整数组，而不仅仅是其长度？

Question

I have an object I defined with a method, childNodes(), which returns an array. When I do something like:

my @arr = obj->childNodes()

I can clearly see that it can properly return an array.

My problem is that when I try to use this method to set the attribute of another class object, Perl decides I just want the length of childNodes() rather than the full array. This is not at all what I want and ruins everything. The code I'm using for this is:

$self->{'_arr'} = obj->childNodes()

How can I make this set $self->{'_arr'} to an array instead of just a scalar number?

Thanks in advance!

Answer 1

When you evaluate an array in scalar context, it returns the length of the array.

You want a reference to the array:

$self->{'_arr'} = [ obj->childNodes() ];

See perldoc perlref .