On Fri, Mar 28, 2008 at 8:49 PM, Andrew Farmer <[EMAIL PROTECTED]> wrote:
> On 28 Mar 08, at 18:37, Mario Gajardo Tassara wrote: > > In a portion of code of my app (collision detection part) i need to > > remove an object from an array of objects, > > when two distinct objects crashed i decrement a life counter, and > > if this is equal to zero the object must be destroyed, but when the > > counter > > reach de zero and the object is destroyed my app crash. Some one can > > help me with this problem, here is the code, and thanks in advance: > > You're removing an object from an array while iterating through it. > Think carefully about what this is doing to the indexes of objects in > the array, and you'll probably see what's going on. > > You probably ought to move to some sort of "mark-and-sweep" algorithm > here, rather than mutating the array while iterating through it. No argument here. But, if you *do* want to mutate an array while iterating through it, a common approach is to iterate through it backwards. That way, deleting an element will only shift the elements at indexes you've already touched. sherm-- > > _______________________________________________ > > Cocoa-dev mailing list ([email protected]) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/sherm.pendley%40gmail.com > > This email sent to [EMAIL PROTECTED] > _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
