Re: Protecting memory

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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All the data continuously generated in your IT infrastructure 
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