Wybr

Wybr is a yet another Rust library implementing some methods of counting votes in preferential elections.

Capabilities

• Read a blt file, as specified in Algorithm 123 paper with OpenSTV extensions for equal votes.
• Tideman alternative count with common variants.
• Borda count with common variants, also usable as plurality voting.
• Nanson method.
• Baldwin method.
• Instant run-off.
• Meek STV count with fixed-point arithmetic, also with Warren variant and few quota options.
• Minimax count.
• Tideman ranked pairs method with common variants.
• Schulze count, in a basic, but most popular form (without advanced tie-breaking).
• Find Smith and Schwartz sets.
• Uses pseudo-random tie breaking in a reproducible way and inform user if the count is deterministic.
• Usable (hopefully) errors, no by-design panics.

Ugly parts

• Not battle tested nor audited.
• Fixed types for candidates and scores.
• Inefficient algorithms and data structures here and there.
• Hobby project.
• Poor documentation.

Related crates

• good_stv
• tallyman