Re: This is undefined, but is it legal?
On 2008-07-26 10:31:04 -0400, "Andrew Koenig" <email@example.com> said:
"Lionel B" <firstname.lastname@example.org> wrote in message
You're ok. The *value* of the variable i may well be undefined, but
i is nonetheless an int; and outputting an int - any int, whatever its
value - should never crash your program. Ditto double, etc.
Not true. It's not true in theory for int, and definitely not true in
practice for double -- because IEEE floating-point, which most modern
computers use, has a notion of "signaling not-a-number" values that cause a
run-time error condition if accessed.
My reading of IEEE-754 is that acessing a signaling NaN causes an
invalid operation exception by default, and the result of that
exception is just to return a quite NaN. Unless the program has
installed a trap handler, this is completely innocuous.
Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The
Standard C++ Library Extensions: a Tutorial and Reference
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