Please note that as of October 24, 2014, the Nokia Developer Wiki will no longer be accepting user contributions, including new entries, edits and comments, as we begin transitioning to our new home, in the Windows Phone Development Wiki. We plan to move over the majority of the existing entries. Thanks for all your past and future contributions.
Avoiding memory leaks during transfer of ownership
The following code demonstrates a common pattern for creating memory leaks:
If the construction of CFoo succeeds, but then the function call that is supposed to take ownership of it fails, then the newly-created CFoo instance is orphaned.
The only way to do this safely is to use the cleanup stack:
CFoo* foo = CFoo::NewL(); CleanupStack::PushL(foo); User::LeaveIfError(bar.TakesOwnershipIfSuccessful(foo)); CleanupStack::Pop(foo);
The most common situations where these kind of leaks occur are array operations such as Append() or Insert().