Update documentation
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RunasSudo
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@ -15,6 +15,7 @@ OpenTally accepts data in the [BLT file format](https://yingtongli.me/git/OpenTa
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* weighted inclusive Gregory STV (e.g. [Scottish STV](https://www.legislation.gov.uk/ssi/2011/399/schedule/1/made))
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* unweighted inclusive Gregory STV (e.g. [Australian Senate STV](https://www.legislation.gov.au/Details/C2020C00400/Html/Text#_Toc59107700))
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* exclusive Gregory STV (e.g. [PRSA 1977](https://www.prsa.org.au/rule1977.htm) and [ERS97](https://www.electoral-reform.org.uk/latest-news-and-research/publications/how-to-conduct-an-election-by-the-single-transferable-vote-3rd-edition/))
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* [Meek STV](http://www.dia.govt.nz/diawebsite.NSF/Files/meekm/%24file/meekm.pdf) – with [tree-packed ballots](http://www.votingmatters.org.uk/ISSUE21/I21P1.pdf) for efficient computation
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OpenTally is highly customisable, including options for:
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@ -6,6 +6,7 @@ The preset dropdown allows you to choose from a hardcoded list of preloaded STV
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* *Recommended WIGM*: A recommended set of simple STV rules designed for computer counting, using the weighted inclusive Gregory method and rational arithmetic.
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* *Scottish STV*: Rules from the [*Scottish Local Government Elections Order 2011*](https://www.legislation.gov.uk/ssi/2011/399/schedule/1/made), using the weighted inclusive Gregory method. Validated against the [2007 Scottish local government election result for Linn ward](https://web.archive.org/web/20121004213938/http://www.glasgow.gov.uk/en/YourCouncil/Elections_Voting/Election_Results/ElectionScotland2007/LGWardResults.htm?ward=1&wardname=1%20-%20Linn).
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* [*Meek STV*](http://www.dia.govt.nz/diawebsite.NSF/Files/meekm/%24file/meekm.pdf): Advanced STV rules designed for computer counting, recognised by the Proportional Representation Society of Australia (Victoria–Tasmania) as the superior STV system. Validated against the [Hill–Wichmann–Woodall implementation](https://www.dia.govt.nz/diawebsite.NSF/Files/meekm/%24file/meekm.pdf) for the ERS97 model election (see below).
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* *Australian Senate STV*: Rules from the [*Commonwealth Electoral Act 1918*](https://www.legislation.gov.au/Details/C2020C00400/Html/Text#_Toc59107700), using the unweighted inclusive Gregory method. Validated against the [2019 Australian Senate election result for Tasmania](https://results.aec.gov.au/24310/Website/SenateDownloadsMenu-24310-Csv.htm).
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* [*PRSA 1977*](https://www.prsa.org.au/rule1977.htm): Simple rules designed for hand counting, using the exclusive Gregory method, with counting automatically performed in thousandths of a vote. Validated against [example 1](https://www.prsa.org.au/example1.pdf) of the PRSA's [*Proportional Representation Manual*](https://www.prsa.org.au/publicat.htm#p2).
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* [*ERS97*](https://www.electoral-reform.org.uk/latest-news-and-research/publications/how-to-conduct-an-election-by-the-single-transferable-vote-3rd-edition/): More complex rules designed for hand counting, using the exclusive Gregory method. Validated against the ERS97 [model election](https://www.electoral-reform.org.uk/latest-news-and-research/publications/how-to-conduct-an-election-by-the-single-transferable-vote-3rd-edition/#sub-section-24).
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@ -40,6 +41,8 @@ This option allows you to specify whether the votes required for election can ch
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* *Static quota*: The quota is calculated once after all first-preference votes are allocated, and remains constant throughout the count.
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* *Static with ERS97 rules*: The quota is static, but candidates may be elected if their vote exceeds (or equals, according to the *Quota criterion*) the total active vote, divided by (*S* + 1) (or *S*, according to the *Quota* option).
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When *Surplus method* is set to *Meek method*, this setting is ignored, and the progressively reducing quota of the Meek method is instead applied.
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## STV variants
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### Surplus order (--surplus-order)
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@ -56,7 +59,7 @@ Some STV counting rules provide, for example, that ‘no surplus shall be transf
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This dropdown allows you to select how ballots are transferred during surplus transfers. The recommended methods are:
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* *Weighted inclusive Gregory* (default): During surplus transfers, all applicable ballot papers of the transferring candidate are examined. Transfers are weighted according to the weights of the ballot papers.
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* *Meek STV*: Transfers are computed as described at <http://www.dia.govt.nz/diawebsite.NSF/Files/meekm/%24file/meekm.pdf>.
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* *Meek method*: Transfers are computed as described at <http://www.dia.govt.nz/diawebsite.NSF/Files/meekm/%24file/meekm.pdf>.
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Other methods are supported, but not recommended:
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@ -76,6 +79,8 @@ Other surplus transfer methods, such as non-fractional transfers (e.g. random sa
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* *Exclude by parcel (by order)*: When excluding a candidate, transfer their ballot papers one parcel at a time, in the order each was received. Each parcel forms a separate stage, i.e. if a transfer allows another candidate to meet the quota criterion, no further papers are transferred to that candidate. This option cannot be combined with bulk exclusion.
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* *Exclude by value*: When excluding candidate(s), transfer their ballot papers in descending order of accumulated transfer value. Each transfer of all ballots of a certain transfer value forms a separate stage.
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When *Surplus method* is set to *Meek method*, this setting is ignored, and the Meek method is instead applied.
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### Ties (-t/--ties)
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This dropdown allows you to select how ties (in surplus transfer or exclusion) are broken. The options are:
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@ -23,10 +23,15 @@ use std::collections::HashMap;
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/// An election to be counted
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pub struct Election<N> {
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/// Name of the election
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pub name: String,
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/// Number of candidates to be elected
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pub seats: usize,
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/// [Vec] of [Candidate]s in the election
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pub candidates: Vec<Candidate>,
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/// Indexes of withdrawn candidates
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pub withdrawn_candidates: Vec<usize>,
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/// [Vec] of [Ballot]s cast in the election
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pub ballots: Vec<Ballot<N>>,
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}
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@ -125,32 +130,52 @@ impl<N: Number> Election<N> {
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/// A candidate in an [Election]
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#[derive(PartialEq, Eq, Hash)]
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pub struct Candidate {
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/// Name of the candidate
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pub name: String,
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}
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/// The current state of counting an [Election]
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//#[derive(Clone)]
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pub struct CountState<'a, N: Number> {
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/// Pointer to the [Election] being counted
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pub election: &'a Election<N>,
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/// [HashMap] of [CountCard]s for each [Candidate] in the election
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pub candidates: HashMap<&'a Candidate, CountCard<'a, N>>,
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/// [CountCard] representing the exhausted pile
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pub exhausted: CountCard<'a, N>,
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/// [CountCard] representing loss by fraction
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pub loss_fraction: CountCard<'a, N>,
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/// [crate::stv::meek::BallotTree] for Meek STV
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pub ballot_tree: Option<crate::stv::meek::BallotTree<'a, N>>,
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/// Values used to break ties, based on forwards tie-breaking
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pub forwards_tiebreak: Option<HashMap<&'a Candidate, usize>>,
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/// Values used to break ties, based on backwards tie-breaking
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pub backwards_tiebreak: Option<HashMap<&'a Candidate, usize>>,
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/// [SHARandom] for random tie-breaking
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pub random: Option<SHARandom<'a>>,
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/// Quota for election
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pub quota: Option<N>,
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/// Vote required for election
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///
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/// With a static quota, this is equal to the quota. With ERS97 rules, this may vary from the quota.
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pub vote_required_election: Option<N>,
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/// Number of candidates who have been declared elected
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pub num_elected: usize,
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/// Number of candidates who have been declared excluded
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pub num_excluded: usize,
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/// The type of stage being counted
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///
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/// For example, "Surplus of", "Exclusion of"
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pub kind: Option<&'a str>,
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/// The description of the stage being counted, excluding [CountState::kind]
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pub title: String,
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/// [Logger] for this stage of the count
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pub logger: Logger<'a>,
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}
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@ -199,7 +224,11 @@ impl<'a, N: Number> CountState<'a, N> {
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/// Represents either a reference to a [CountState] or a clone
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#[allow(dead_code)]
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pub enum CountStateOrRef<'a, N: Number> {
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State(CountState<'a, N>), // NYI: May be used e.g. for tie-breaking or rollback-based constraints
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/// Cloned [CountState]
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///
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/// Currently unused/unimplemented, but may be used in future for rollback-based constraints
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State(CountState<'a, N>),
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/// Reference to a [CountState]
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Ref(&'a CountState<'a, N>),
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}
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@ -220,22 +249,33 @@ impl<'a, N: Number> CountStateOrRef<'a, N> {
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/// Result of a stage of counting
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pub struct StageResult<'a, N: Number> {
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/// See [CountState::kind]
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pub kind: Option<&'a str>,
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/// See [CountState::title]
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pub title: &'a String,
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/// Detailed logs of this stage, rendered from [CountState::logger]
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pub logs: Vec<String>,
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/// Reference to the [CountState] or cloned [CountState] of this stage
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pub state: CountStateOrRef<'a, N>,
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}
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/// Current state of a [Candidate] during an election count
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#[derive(Clone)]
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pub struct CountCard<'a, N> {
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/// State of the candidate
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pub state: CandidateState,
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/// Order of election or exclusion
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///
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/// Positive integers represent order of election; negative integers represent order of exclusion
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pub order_elected: isize,
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//pub orig_votes: N,
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/// Net votes transferred to this candidate in this stage
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pub transfers: N,
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/// Votes of the candidate at the end of this stage
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pub votes: N,
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/// Parcels of ballots assigned to this candidate
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pub parcels: Vec<Parcel<'a, N>>,
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/// Candidate's keep value (Meek STV)
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@ -275,7 +315,9 @@ pub type Parcel<'a, N> = Vec<Vote<'a, N>>;
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/// Represents a [Ballot] with an associated value
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#[derive(Clone)]
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pub struct Vote<'a, N> {
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/// Ballot from which the vote is derived
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pub ballot: &'a Ballot<N>,
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/// Current value of the ballot
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pub value: N,
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/// Index of the next preference to examine
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pub up_to_pref: usize,
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@ -283,7 +325,9 @@ pub struct Vote<'a, N> {
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/// A record of a voter's preferences
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pub struct Ballot<N> {
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/// Original value/weight of the ballot
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pub orig_value: N,
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/// Indexes of candidates preferenced on the ballot
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pub preferences: Vec<usize>,
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}
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@ -292,10 +336,16 @@ pub struct Ballot<N> {
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#[derive(PartialEq)]
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#[derive(Clone)]
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pub enum CandidateState {
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/// Hopeful (continuing candidate)
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Hopeful,
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/// Required by constraints to be guarded from exclusion
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Guarded,
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/// Declared elected
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Elected,
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/// Required by constraints to be doomed to be excluded
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Doomed,
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/// Withdrawn candidate
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Withdrawn,
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/// Declared excluded
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Excluded,
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}
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@ -15,6 +15,10 @@
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#![warn(missing_docs)]
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//! Open source counting software for various preferential voting election systems
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/// Data types for representing abstract elections
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pub mod election;
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/// Smart logging framework
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@ -18,6 +18,7 @@
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/// Smart logger used in election counts
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#[derive(Clone)]
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pub struct Logger<'a> {
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/// [Vec] of log entries for the current stage
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pub entries: Vec<LogEntry<'a>>,
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}
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@ -73,7 +74,9 @@ impl<'a> Logger<'a> {
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/// Represents either a literal or smart log entry
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#[derive(Clone)]
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pub enum LogEntry<'a> {
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/// Smart log entry - see [SmartLogEntry]
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Smart(SmartLogEntry<'a>),
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/// Literal log entry
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Literal(String)
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}
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@ -42,6 +42,7 @@ fn get_factor() -> &'static IBig {
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pub struct Fixed(IBig);
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impl Fixed {
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/// Set the number of decimal places to compute results to
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pub fn set_dps(dps: usize) {
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unsafe {
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DPS = Some(dps);
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@ -108,6 +109,7 @@ impl From<f64> for Fixed {
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}
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}
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// TODO: Fix rounding
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impl fmt::Display for Fixed {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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let dps = match f.precision() {
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@ -48,6 +48,7 @@ fn get_factor_cmp() -> &'static IBig {
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pub struct GuardedFixed(IBig);
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impl GuardedFixed {
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/// Set the number of decimal places to compute results to
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pub fn set_dps(dps: usize) {
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unsafe {
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DPS = Some(dps);
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@ -22,6 +22,7 @@ pub mod gregory;
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/// Meek method of surplus distributions, etc.
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pub mod meek;
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/// WebAssembly wrappers
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//#[cfg(target_arch = "wasm32")]
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pub mod wasm;
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@ -38,22 +39,39 @@ use std::ops;
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/// Options for conducting an STV count
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pub struct STVOptions {
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/// Round transfer values to specified decimal places
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pub round_tvs: Option<usize>,
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/// Round ballot weights to specified decimal places
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pub round_weights: Option<usize>,
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/// Round votes to specified decimal places
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pub round_votes: Option<usize>,
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/// Round quota to specified decimal places
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pub round_quota: Option<usize>,
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/// How to calculate votes to credit to candidates in surplus transfers
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pub sum_surplus_transfers: SumSurplusTransfersMode,
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/// Convert ballots with value >1 to multiple ballots of value 1
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pub normalise_ballots: bool,
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/// Quota type
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pub quota: QuotaType,
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/// Whether to elect candidates on meeting (geq) or strictly exceeding (gt) the quota
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pub quota_criterion: QuotaCriterion,
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/// Whether to apply a form of progressive quota
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pub quota_mode: QuotaMode,
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/// Tie-breaking method
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pub ties: Vec<TieStrategy>,
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/// Method of surplus distributions
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pub surplus: SurplusMethod,
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/// Order to distribute surpluses
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pub surplus_order: SurplusOrder,
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/// Examine only transferable papers during surplus distributions
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pub transferable_only: bool,
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/// Method of exclusions
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pub exclusion: ExclusionMethod,
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/// Use bulk exclusion
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pub bulk_exclude: bool,
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/// Defer surplus distributions if possible
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pub defer_surpluses: bool,
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/// Print votes to specified decimal places in results report
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pub pp_decimals: usize,
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}
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#[derive(Clone, Copy)]
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#[derive(PartialEq)]
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pub enum SumSurplusTransfersMode {
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/// Sum and round all surplus transfers for a candidate in a single step
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SingleStep,
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/// Sum and round a candidate's surplus transfers separately for ballot papers received at each particular value
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ByValue,
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/// Sum and round a candidate's surplus transfers individually for each ballot paper
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PerBallot,
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}
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#[derive(Clone, Copy)]
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#[derive(PartialEq)]
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pub enum QuotaType {
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/// Droop quota
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Droop,
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/// Hare quota
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Hare,
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/// Exact Droop quota (Newland–Britton/Hagenbach-Bischoff quota)
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DroopExact,
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/// Exact Hare quota
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HareExact,
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}
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@ -216,7 +241,9 @@ impl QuotaType {
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#[derive(Clone, Copy)]
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#[derive(PartialEq)]
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pub enum QuotaCriterion {
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/// Elect candidates on equalling or exceeding the quota
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GreaterOrEqual,
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/// Elect candidates on strictly exceeding the quota
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Greater,
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}
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@ -235,7 +262,9 @@ impl QuotaCriterion {
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#[derive(Clone, Copy)]
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#[derive(PartialEq)]
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pub enum QuotaMode {
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/// Static quota
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Static,
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/// Static quota with ERS97 rules
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ERS97,
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}
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@ -254,9 +283,13 @@ impl QuotaMode {
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#[derive(Clone, Copy)]
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#[derive(PartialEq)]
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pub enum SurplusMethod {
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/// Weighted inclusive Gregory method
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WIG,
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/// Unweighted inclusive Gregory method
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UIG,
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/// Exclusive Gregory method (last bundle)
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EG,
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/// Meek method
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Meek,
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}
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@ -277,7 +310,9 @@ impl SurplusMethod {
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#[derive(Clone, Copy)]
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#[derive(PartialEq)]
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pub enum SurplusOrder {
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/// Transfer the largest surplus first, even if it arose at a later stage of the count
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BySize,
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/// Transfer the surplus of the candidate elected first, even if it is smaller than another
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ByOrder,
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}
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#[derive(Clone, Copy)]
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#[derive(PartialEq)]
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pub enum ExclusionMethod {
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/// Transfer all ballot papers of an excluded candidate in one stage
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SingleStage,
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/// Transfer the ballot papers of an excluded candidate in descending order of accumulated transfer value
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ByValue,
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/// Transfer the ballot papers of an excluded candidate parcel by parcel in the order received
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ParcelsByOrder,
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}
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@ -316,7 +354,9 @@ impl ExclusionMethod {
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#[wasm_bindgen]
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#[derive(Debug)]
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pub enum STVError {
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/// User input is required
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RequireInput,
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/// Tie could not be resolved
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UnresolvedTie,
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}
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@ -129,27 +129,38 @@ macro_rules! impl_type {
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}
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// Wrapper structs
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// Required as we cannot specify &'static in wasm-bindgen: issue #1187
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/// Wrapper for [CountState]
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///
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/// This is required as `&'static` cannot be specified in wasm-bindgen: see [issue 1187](https://github.com/rustwasm/wasm-bindgen/issues/1187).
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///
|
||||
#[wasm_bindgen]
|
||||
pub struct [<CountState$type>](CountState<'static, $type>);
|
||||
#[wasm_bindgen]
|
||||
impl [<CountState$type>] {
|
||||
/// Create a new [CountState] wrapper
|
||||
pub fn new(election: &[<Election$type>]) -> Self {
|
||||
return [<CountState$type>](CountState::new(election.as_static()));
|
||||
}
|
||||
}
|
||||
|
||||
/// Wrapper for [Election]
|
||||
///
|
||||
/// This is required as `&'static` cannot be specified in wasm-bindgen: see [issue 1187](https://github.com/rustwasm/wasm-bindgen/issues/1187).
|
||||
///
|
||||
#[wasm_bindgen]
|
||||
pub struct [<Election$type>](Election<$type>);
|
||||
#[wasm_bindgen]
|
||||
impl [<Election$type>] {
|
||||
/// Return [Election::seats]
|
||||
pub fn seats(&self) -> usize { self.0.seats }
|
||||
|
||||
/// Return the underlying [Election] as a `&'static Election`
|
||||
///
|
||||
/// # Safety
|
||||
/// This assumes that the underlying [Election] is valid for the `'static` lifetime, as it would be if the [Election] were created from Javascript.
|
||||
///
|
||||
fn as_static(&self) -> &'static Election<$type> {
|
||||
// Need to have this as we cannot specify &'static in wasm-bindgen: issue #1187
|
||||
unsafe {
|
||||
let ptr = &self.0 as *const Election<$type>;
|
||||
&*ptr
|
||||
|
|
@ -218,7 +229,7 @@ impl STVOptions {
|
|||
/// Return the underlying [stv::STVOptions] as a `&'static stv::STVOptions`
|
||||
///
|
||||
/// # Safety
|
||||
/// Assumes that the underlying [stv::STVOptions] is valid for the `'static` lifetime, as it would be if the [stv::STVOptions] were created from Javascript
|
||||
/// This assumes that the underlying [stv::STVOptions] is valid for the `'static` lifetime, as it would be if the [stv::STVOptions] were created from Javascript.
|
||||
///
|
||||
fn as_static(&self) -> &'static stv::STVOptions {
|
||||
unsafe {
|
||||
|
|
|
|||
|
|
@ -29,9 +29,13 @@ use std::io::{stdin, stdout, Write};
|
|||
/// Strategy for breaking ties
|
||||
#[derive(PartialEq)]
|
||||
pub enum TieStrategy {
|
||||
/// Break ties according to the candidate who first had more/fewer votes
|
||||
Forwards,
|
||||
/// Break ties according to the candidate who most recently had more/fewer votes
|
||||
Backwards,
|
||||
/// Break ties randomly (see [crate::sharandom])
|
||||
Random(String),
|
||||
/// Prompt the user to break ties
|
||||
Prompt,
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue