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Implement direct usize indexing #132

Merged
merged 2 commits into from
Aug 7, 2020
Merged

Implement direct usize indexing #132

merged 2 commits into from
Aug 7, 2020

Commits on Aug 7, 2020

  1. Implement direct usize indexing 

    ```rust
where
    IndexMap<K, V, S>: IndexMut<usize, Output = V>,
    IndexSet<T, S>: Index<usize, Output = T>,
```

This allows `map[i]` and `set[i]` indexing to access values directly,
panicking if the index is out of bounds, similar to slices.

On maps, this somewhat overlaps with `Index<&Q> + IndexMut<&Q>` where
`Q: Equivalent<K>`. The reference makes this indexing unambiguous, but
it could be confusing to users if the key type is also an integer.
    @cuviper
    cuviper committed Aug 7, 2020
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  2. Add documentation and examples for Index and IndexMut

    @cuviper
    cuviper committed Aug 7, 2020
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