[REQ] NewtonDestroyBody must check

[AntonSynytsia]

It would be nice to have newton check whether the body_ptr is not deleted prior to destroying the body. That way you will avoid crashes under certain circumstances that the developer might come across.

[AntonSynytsia]

Or perhaps create the checking functions:

NewtonBodyValid(body_ptr) - returns 1 (valid) or 0 (invalid)

~ and some more to remain consistent.

NewtonCollisionValid
NewtonWorldValid

[Julio Jerez]

you can do that yourself
the body have a destructor function pointer.

all you have to do when you create a body is place each body in a map, and assign the destructor callback.
the detrusor callback is called by the engine body when the body is about to be deleted, you simple remove it for the map
then NewtonBodyValid(body_ptr) simple check if the point is in the map

[AntonSynytsia]

handling bodies via the destructor callback is perhaps not a bad idea. Thanks!