Re: [openvrml-develop] shared_ptr<scope> and scope*

[Braden M. <br...@en...>]

On Wed, 2008-07-23 at 12:31 +0400, Murashov Gleb wrote:
> Hi.
> 
> Could you tell me, please, how function
> openvrml::node_type::create_node() is supposed to be used?
> I'm asking, because I'm little bit confused that one get shared_ptr<
> scope > as parameter and openvrml::node use shared_ptr inside, but
> node::scope() and scene::root_scope() return scope& and scope*.
> Is it bug?

No. Nodes participate in ownership of scopes. There's not a reason to
propagate ownership of scopes to other types of objects.

node_type::create_node is a rather low-level operation from OpenVRML's
perspective. That is not to say that you shouldn't be using it; just be
aware that browser::create_vrml_from_stream may be an appropriate
alternative.

> Another question: everywhere, working with object openvrml::node,
> intrusive_ptr is used, but openvrml::scope::find_node() returns
> openvrml::node*. Although in this case safe work is possible, I think
> that it is not in right way.

You can safely construct an intrusive_ptr from a raw pointer whenever
you need to create an owning pointer. (Notwithstanding, of course, the
potential to create ownership cycles--which you are responsible for
avoiding/accommodating.)

-- 
Braden McDaniel                           e-mail: <br...@en...>
<http://endoframe.com>                    Jabber: <br...@ja...>