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David Jones wrote:
b) because hash tables use address-based hashing (for keys that are themselves tables), so the order of pairs() depends on where in memory the tables (that are keys) got allocated. That can change either on a whim or, perhaps more likely, when DLLs have been mapped into different places in the address space (thus meaning the holes left for memory allocation are different).

...not to mention operating systems like OpenBSD which do their damndest to make sure you never get the same address twice, for security reasons. Yes, malloc() really does end up invoking the random number generator.

David Given