[xsd-users] Getting at the autopointers

[Boris Kolpackov]

Giles,

COPE, Giles, FM <Giles.COPE at rbos.com> writes:

> Hi Boris, when our root object destructor gets called the whole tree is
> deleted. Presumably this is because it's following each autopointer and
> calling the destructor on what it owns.

That's right, each node in the document tree owns its sub-tree.


> We'd like to get to the autopointer to release it, so that we can put the
> objects into a cache and manage their lifecycle independently of the main
> document.

If I understood you correctly, you want to "detach" some sub-trees from
the complete document tree and manage them separately. The only way that
I can think of is by making a copy of the nodes that you are interested
in (a copy of all the "sub-nodes" will be made automatically). E.g.,
suppose you have the following schema:

<complexType name="Foo">

  ...

</complexType>


<complexType name="Bar">
  <sequence>
    <element name="foo" type="Foo"/>

    ...

  </sequence>
</complexType>


Then you can do something like this:

Bar& b = ...

auto_ptr<Foo> f (new Foo (b.foo ())); // Make a copy.

cache.add (f.release ()); // Add to the cache.


hth,
-boris
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