int nan
bearophile
bearophileHUGS at lycos.com
Sun Jun 28 15:02:46 PDT 2009
ponce:
> What would be the NaN of uint ?
Having a NaN in just signed integral values (of 1, 2, 4, 8, 16 bytes) looks enough to me, see below.
>What if you actually need 2^32 different values (such as in a linear congruential random number generator) ?<
I agree that there are many situations where you want 2^32 different values, or 2^16, etc, in such situations you can use an utiny/ushort/uint/ulong/ucent that has no nan (and once in while you may even use a nullable uint like in C#).
But I think it's much less common to need 2^32 or 2^64 different signed integers.
>Besides, there would be no cheap way to ensure NaN propagation (no hardware support).<
I was talking about having hardware support, of course.
Bye,
bearophile
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