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List:       kde-perl
Subject:    [Kde-perl] Reference counting
From:       Ashley Winters <qaqortog () nwlink ! com>
Date:       2002-05-26 3:57:30
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I've finally given up hopes of doing weird things to object reference-counts. 
I will let Perl handle reference-counts and decide when to delete objects. :)

Two exceptions, though. First, any object can be made parent-controlled with a 
method call; something like $object->owned (or a better name?). Second, any 
constructor called in a void context returns a persistent (owned?) object. I 
don't think I would use ->owned much, but I'd definitely use constructors in 
void context.

sub foo {
    my $self = shift;
    my $w = shift;
    new Qt::Label('Destroyed when $self deletes me', $self);  # void context
    my $x = new Qt::Label('Destroyed when $self deletes me', $self)->owned;
    my $l = new Qt::Label('Destroyed at the end of &foo', $self);
    $self->{label} = new Qt::Label('Destroyed when $self is', $self);
}

It seems that deleting the QApplication before all widgets are gone is a Bad 
Thing. Some objects try to use the QApplication after it croaks, which I 
thought Qt would prevent... Perhaps it's my fault.

I can't work on signals/slots until I get virtual function return-values to 
work, which I can't do till I get rid of MyStack, which might as well be 
replaced with a production-quality type-marshalling system, which will take 
me a couple days to write. More updates then.

Ashley Winters

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