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Re: Quantum Weirdness and the Increment Operatorby BrowserUk (Patriarch) |
on Jun 24, 2004 at 06:08 UTC ( [id://369249]=note: print w/replies, xml ) | Need Help?? |
Fun. The reason that using your preInc() sub changes the result is because the value it returns is a copy of $m's value at the end of the call to the sub. By contrast, the value of $m used by the + operator in the non-sub statement is the value of $m at the point after both the subexpressions involved in the + operation have been evaluated. I assume that the order of the evaluation is a result of converting the expressions to their reverse polish form. Clear as mud, but this is (roughly) equivalent
At least, it produces the same result and is close enough for my mental processes to get a notional handle on the mechanism.
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