Peter Cornelius am Montag, 29. Mai 2006 05.30:
> On May 27, 2006, at 3:56 PM, chen li wrote:
> > Based on what I learn the regular method to defer a
> > hash reference to get specific value takes this
> > format:
> >
> > $ref_hash->{key1}
> >
> > but in this line
> > $_[0]->{_name}= $_[1] if defined $_[1]
> >
> > the format is
> > array element->{_name}
>
> Yes, the contents of the array element is a hash ref. You could
> rewrite this to be the equivalent
>
> ${$_[0]}->{_name} = $_[1] if defined $_[1]
I guess you meant ${$_[0]}{_name}
${$_[0]}{_name} and $_[0]->{_name} are equivalent,
both '->' and ${} dereference the hashref.
[...]
> I guess this hash reference is being implicitly passed in by the
> method call as part of Perl's OOP implementation so you never do see
> the actual parameter passage of
This different usage of the '->' operator in OOP may be another source of
confusion.
Class method: MyClass->new(@arguments)
implicitly passes @arguments preceeded by the string 'MyClass' to new()
Object method: $obj->handle(@arguments)
implicitly passes @arguments preceeded by the object $obj to handle()
Dani
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