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# Bit Seeking
This iterator yields indices of bits set to `1`, rather than bit-values
themselves. It is essentially the inverse of indexing: rather than applying a
`usize` to the bit-slice to get a `bool`, this applies a `bool` to get a
`usize`.
It is created by the [`.iter_ones()`] method on bit-slices.
## Examples
```rust
use bitvec::prelude::*;
let bits = bits![0, 1, 0, 0, 1];
let mut ones = bits.iter_ones();
assert_eq!(ones.next(), Some(1));
assert_eq!(ones.next(), Some(4));
assert!(ones.next().is_none());
```
[`.iter_ones()`]: crate::slice::BitSlice::iter_ones
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