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From: Greg Colvin (Gregory.Colvin_at_[hidden])
Date: 2002-09-07 10:09:59

At 08:45 AM 9/7/2002, Larry Evans wrote:
>Greg Colvin wrote:
>>It's been my intent to create a version of cyclic_ptr that
>>would be compatible with intrusive_ptr and shared_ptr, but
>>I haven't had time or motivation. The weak_ptr companion to
>I've been working on the something similar. I also realized that
>the method of garbage collection and method of internal pointer
>enumeration were independent. The two garbage collection methods
>I'm working on are your's and the local mark scan of Lin's.

Tell me more about how you are using Lin's method.

>I've got
>an enumeration:
> enum
> { gc_local_mark_scan
> //^ Lins's method
> , gc_global_mark_scan
> //^ Christopher's(or Colvin's) method
> };
>to select which one in a specialized class. I've got another enumeration
>to specify the method of enumerating the internal pointers:
> enum
> { ip_offset_iterator
> //^ this method has the proxies record their offsets in
> // their containing subject. Also, containers(e.g. vector)
> // of proxies record their offsets from their containing subject
> // as well as a function to iterate over the contained
> // proxies (e.g. something based on vector::iterator ).
> //
> // This method off accessing internal pointers is based
> // on:
> // David L. Detlefs
> // "Garbage collection and runtime typing as a C++ library"
> // _USENIX C++ Conference_, Portland, Oregon
> // August 1992
> // USENIX Association
> //
> // However, in addition to Detlef's method, this method also
> // is able to access pointers within containers, such as
> // vector<prox_type> or list<prox_type> by using template,
> // scoped_cyclic_container.
> , ip_assign_op_switch
> //^ this method uses subject::operatr= with self as arg to cause
> // all proxies (i.e. internal pointer) within the subject
> // to call their operator= via the virtual children method. // This proxy::operator= then calls the static parent method.
> // This is Greg Colvin's method.
> };
>I've got a driver working with gc_local_mark_scan and ip_offset_iterator.
>I'm still working on the others.
>You're review and comments would be useful. Should we work on it
>in the sandbox or should I just upload the still incomplete code to

Whatever works for you is fine with me. For now just email me your code.

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