Helper class for switching the current thread to share that of a peer worker thread. This is necessary for heap manipulating actions such as adding to a container owned by the peer, as well as the more obvious case of deleting an object created by them. Construct a THeapSwitcher instance passing the identity of the peer thread to switch to using their heap. Destroy the THeapSwitcher instance or explicitly call RevertToOwnHeap() to resume using the normal heap for the caller thread.