[osg-users] Best usage of function: return ref_ptr or standard ptr?

2012-01-30 Thread Juan Herrera 
Hi,

I have a function which I want to return a group, with two alternatives:


Code:

osg::ref_ptr osg::Group  returnGroup()
{
osg::ref_ptr  osg::Group  group = new osg::Group;
...
return group;
}





Code:

osg::Group * returnGroup()
{
osg::Group * group = new osg::Group;
...
return group;
}




Which usage is better if garbage collection is desired?

Thank you!

Cheers,
Juan

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Re: [osg-users] Best usage of function: return ref_ptr or standard ptr?

2012-01-30 Thread Kim Bale 
Hi Juan,

Returning a reference counted pointer is in general the safest thing to do
as it ensures that the object will get deleted when it goes out of scope.

A quick search of the osg-users will reveal a number of threads on the
subject alternatively try the link below:

http://andesengineering.com/OSG_ProducerArticles/RefPointers/RefPointers.html

K.



On 30 January 2012 21:45, Juan Herrera juan...@gmail.com wrote:

 Hi,

 I have a function which I want to return a group, with two alternatives:


 Code:

 osg::ref_ptr osg::Group  returnGroup()
 {
 osg::ref_ptr  osg::Group  group = new osg::Group;
 ...
 return group;
 }





 Code:

 osg::Group * returnGroup()
 {
 osg::Group * group = new osg::Group;
 ...
 return group;
 }




 Which usage is better if garbage collection is desired?

 Thank you!

 Cheers,
 Juan

 --
 Read this topic online here:
 http://forum.openscenegraph.org/viewtopic.php?p=45134#45134





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Re: [osg-users] Best usage of function: return ref_ptr or standard ptr?

2012-01-30 Thread Philipp Moeller 
Juan Herrera juan...@gmail.com writes:

 Hi,

 I have a function which I want to return a group, with two alternatives:


 Code:

 osg::ref_ptr osg::Group  returnGroup()
 {
 osg::ref_ptr  osg::Group  group = new osg::Group;
 ...
 return group;
 }





 Code:

 osg::Group * returnGroup()
 {
 osg::Group * group = new osg::Group;
 ...
 return group;
 }




 Which usage is better if garbage collection is desired?

There is no garbage collection in osg. Objects are deleted through
reference counting, but that is probably what you mean.

I'd go with the second style if nothing in returnGroup stores the
pointer. It is certainly safe, if the pointer is assigned to a ref_ptr
in another object. In general, use ref_ptr when you need to store
something for a longer duration and a plain pointer for short-lived
access and creation.

Cheers,
Philipp



 Thank you!

 Cheers,
 Juan

 --
 Read this topic online here:
 http://forum.openscenegraph.org/viewtopic.php?p=45134#45134





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