How do I get the number of bits in `usize` in stable rust?

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1

As per the topic, unfortunately std::usize::BITS seems to be unstable only

2

How about std::mem::size_of::<usize>() * 8?

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3

Another fun option:

(0usize).count_zeroes()
// or
(usize::MAX).count_ones()

Of course, whichever way you get the number, it should be stuffed into a const USIZE_BITS: uN = ...;, so it doesn't really matter exactly how you get the number.

Also it's worth noting that usize::BITS is not only unstable (in Rust 1.2.0), but removed from modern stdlib distributions.

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