rust-idmap

Efficient maps of integer id keys to values, backed by an underlying Vec.

Features

• Automiatically derived IntegerId for enums and newtype structs
  • Implemented in the idmap-derive proc_macro crate
• Maintains insertion order of the entries, as there's an iderection like OrderMap.
  • Therefore, entries which aren't present take little space, as only a u32 needs to be stored.
• Supports a CompactIdMap which handles indexes offset from the start element.