add _by_slot methods and `Index::slot()` accessor

LPGhatguy / thunderdome

Arena type inspired by generational-arena

Apache License 2.0

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add _by_slot methods and `Index::slot()` accessor #13

Closed sdleffler closed 3 years ago

sdleffler commented 3 years ago

This PR adds a .slot() method to Index, allowing its slot: u32 field to be extracted. It also adds several methods to Arena for working with generation-less slots.

sdleffler commented 3 years ago

Oops, forgot to update the comment on contains_slot.