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Message: [QUOTE="Roman Ziak, post: 2379810"] This is very easy to catch and I believe several compilers including VC do implement that at least in _Debug_ configuration: 1) run-time keeps the list of free blocks and under certain circumstances may check if the pointer being freed is on that list. 2) every valid memory block has a header which contains a _signature_. There is still a slight chance of random data forming the signature, but that is of much lesser chance. The method has almost no performance hit, so it stay in effect even for _Release_ configuration. Roman [/QUOTE]