From: Nobuyoshi Nakada <nobu.nokada@...>
Date: 2002-04-19T09:54:09+09:00
Subject: Re: GC problem in C++ extension

Hi,

At Fri, 19 Apr 2002 08:53:55 +0900,
Paul Brannan wrote:
> > and, in fact, I do see that if I delete line 25.  How can I make sure
> > that the allocated Foo object gets properly destructed?

It's not predictable when an object will be gargage-collected.

> Ouch, I should proofread before I post.  The correct change to make to
> get the behavior I want is not to delete line 25, but to change:
> 
>   VALUE v = Data_Wrap_Struct(rb_cObject, 0, (RUBY_DATA_FUNC)Foo::free, f);
> 
> to:
> 
>   Data_Wrap_Struct(rb_cObject, 0, (RUBY_DATA_FUNC)Foo::free, f);
> 
> Why does making this change allow the object to get garbage collected?

In former case, the new object might be stored in the stack,
and marked there.  Just my guess.

-- 
Nobu Nakada