[boost] [smart_ptr] Remove the new operation for reference count in shared_ptr and shared_array

From: XHChen_at_[hidden]
Date: 2007-07-29 05:09:30

Hi All,

        I studied the shared_ptr in the recent few days,
and found that it uses a global reference count to determine
when to delete the real pointer. The reference count is 
created by operator new.
        It is possible to remove the new operation by replacing 
the reference count with a linked list structure. All shared_ptr 
on the same real pointer should be linked in one list. Thus 
the length of the link list is actually the reference count.
        If a shared_ptr is destructed, it removes itself from the 
link list. And then if no other shared_ptr on the link list, it delete 
the real pointer.
        Attachment is the simple implement for shared_ptr in the way
of linked list. Hopes that the method is useful and can be accepted.

Best regards,
Xhchen

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