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Message: [QUOTE="James Kanze, post: 3794333"] Aha. I'd missed the pass by value. It's not very idiomatic, and will confuse programmers (which IMHO are good reasons not to use it), but it will work. And you're still missing a return:-). I could probably do with more coffee too, since I didn't see the pass by value:-). Plus missing the return statement in a function which has a non-void return type. But all compilers should catch the first, good compilers will warn about the second, and the correction is obvious in both case. [/QUOTE]