Re: Protecting memory

This seems like a good time to use boost's shared_ptr and weak_ptr.

Ryan

On Wed, Nov 30, 2011 at 4:27 PM, Nigel Atkinson <[email protected]>wrote:

> Hi Colin,
>
> You can wrap your pointers up in a smart pointer, made specifically
> for the job.  I made what I call a ward_ptr, a class that is really
> just a wrapper around a raw pointer, except it has a member called
> 'invalidate' which sets the raw pointer it stores to null.  You call
> this on the C++ side whenever the object it points to is deleted.  If
> the smart pointer is used (dereferenced) while its stored pointer is
> null, it throws an exception - which if that happens inside a function/
> method called from luabind,  gets turned into  a lua error by luabind.
>
> You could have a "isvalid" method too, in order to check a pointer
> rather than just using it and causing an exception.  I don't in mine,
> as I use it with a library I didn't write bound with luabind.
>
> Heres a link to some code!   Feel free to use it.
>
> https://github.com/merlinblack/Game-Engine-Testbed/blob/master/include/ward_ptr.h
>
>
> Nigel
>
> On 30/11/2011, at 10:39 PM, Colin GILLE / congelli501 wrote:
>
> > Hi,
> >
> > I'm new to this mailing list and quite new to luabind too.
> > I'm creating a 2D game engine with lua scripting and I wich to
> > protect the memory (against segmentation faults).
> > Some of my functions return pointers to objects, and these objects
> > can be deleted later by the engine.
> > When the user uses a pointer, I would like to check if this pointer
> > is still valid before using it in my C++ code.
> > I can easily do that if the pointer in a function argument but I
> > don't know how to that when the user use the member of the object.
> >
> > What is the good way to do it with luabind ?
> >
> > Thanks in advance !
> >
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>
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-- 
Ryan Pavlik
HCI Graduate Student
Virtual Reality Applications Center
Iowa State University

[email protected]
http://academic.cleardefinition.com

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contains a definitive record of customers, application performance, 
security threats, fraudulent activity, and more. Splunk takes this 
data and makes sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-novd2d

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