Re: [osg-users] manual delete object
Hi, Thanks, your hint already gave it all out. I was wondering if user need to keep track of the reference to Node assigned to Group. As you said, group use smart pointer internally so group-addChild(new Node) will delete the node created once group is gone. Thank you! Cheers, Rabbi -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=13370#13370 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] manual delete object
Hi, When I tried Node* node = new Node; delete node; there is a compiler error saying destructor protected. How can I delete node that I am sure I no longer use. Thank you! Cheers, Rabbi -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=13275#13275 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] manual delete object
Nodes are derived from Object which is refcounted thus the destructor is not directly accessible You can use node-unref(); Node = NULL; Gordon Product Manager 3d __ Gordon Tomlinson Email : gtomlinson @ overwatch.textron.com __ -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Rabbi Robinson Sent: Monday, June 01, 2009 10:55 AM To: osg-users@lists.openscenegraph.org Subject: [osg-users] manual delete object Hi, When I tried Node* node = new Node; delete node; there is a compiler error saying destructor protected. How can I delete node that I am sure I no longer use. Thank you! Cheers, Rabbi -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=13275#13275 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] manual delete object
Hi Rabbi,
The destructor of most OSG class is deliberately made protected so
your can't delete it directly using delete, it also prevents the class
from being created on the stack.
Why? This is a C++ programming trick that can help prevent misue of
C++ classes that are reference counted, and the OSG uses reference
almost everywhere for it's memory management of scene graph classes so
it's crucial that users use reference counting rather than try and mix
and match objects memory management.
The final answer to your question, how do you delete... well you don't
you leave it up to smart pointers and reference counting to do the
job. You simple do:
{
osg::ref_ptrNode node = new Node; // create node on stack and
take a reference to it.
} // ref_ptr goes out of scope and decrements the reference count,
and if it goes to 0, then it's deleted.
Robert.
On Mon, Jun 1, 2009 at 3:54 PM, Rabbi Robinson longa...@gmail.com wrote:
Hi,
When I tried
Node* node = new Node;
delete node;
there is a compiler error saying destructor protected. How can I delete node
that I am sure I no longer use.
Thank you!
Cheers,
Rabbi
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Re: [osg-users] manual delete object
Hi,
Thanks, if later I reference the node from a group, will the reference count be
increased for the node?
{
osg::ref_ptrNode node = new Node;
osg::ref_ptrGroup group = new Group;
group-addChild(node);
}
The reference count of node should be one outside the scope. Is it right that
somehow group-addChild(node) increases the reference count of node?
Thank you!
Cheers,
Rabbi
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Re: [osg-users] manual delete object
On Mon, Jun 1, 2009 at 4:39 PM, Rabbi Robinson longa...@gmail.com wrote:
Hi,
Thanks, if later I reference the node from a group, will the reference count
be increased for the node?
{
osg::ref_ptrNode node = new Node;
osg::ref_ptrGroup group = new Group;
group-addChild(node);
}
The reference count of node should be one outside the scope. Is it right that
somehow group-addChild(node) increases the reference count of node?
I won't answer this directly - an exercise for the reader...
The hint I'll give is that Group uses osg::ref_ptrosg::Node
internally so when you add a node it
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