Advanced Cleanup

Advanced cleanup covers areas such as cleanup of heap arrays, cleanup of non-CBase classes and use of TAutoClose.

• Cleanup stack support for non-CBase classes
  The cleanup stack supports other types of cleanup using CleanupStack::PushL().
• How to clean up non-CBase classes
  
• Cleanup utilities
  The Cleanup utility functions support four types of clean up operation.
• Cleanup for heap arrays
  C++ arrays are allocated on the heap and require their own particular cleanup.
• How to use CleanupDeletePushL()
  CleanupDeletePushL() pushes a TCleanupItem onto the cleanup stack ready for CleanupStack::PopAndDestroy() to delete.
• How to use CleanupClosePushL()
  The CleanupClosePushL() templated function constructs and pushes a TCleanupItem onto the cleanup stack.
• How to use CleanupReleasePushL()
  CleanupReleasePushL() pushes a TCleanupItem onto the cleanup stack ready for CleanupStack::PopAndDestroy() to release.
• Cleanup following trap harnesses
  Some cleanup requirements must be handled by the cleanup code after the trap harness.
• Using TAutoClose
  Example code showing how TAutoClose can be used to clean up when an object goes out of scope.