Allow configuring --round-votes

Fix bug with display of negative Rational's

src/main.rs

@@ -21,9 +21,9 @@ mod numbers;
 mod stv;
 
 use crate::election::{Candidate, CandidateState, CountCard, CountState, CountStateOrRef, Election, StageResult};
-use crate::numbers::{NativeFloat, Number, Rational};
+use crate::numbers::{NativeFloat64, Number, Rational};
 
-use clap::Clap;
+use clap::{AppSettings, Clap};
 use git_version::git_version;
 
 use std::fs::File;
@@ -47,12 +47,27 @@ enum Command {
 
 /// Count a single transferable vote (STV) election
 #[derive(Clap)]
+#[clap(setting=AppSettings::DeriveDisplayOrder, setting=AppSettings::UnifiedHelpMessage)]
 struct STV {
+	// -- File input --
+	
 	/// Path to the BLT file to be counted
 	filename: String,
+	
+	// -- Numbers settings --
+	
 	/// Numbers mode
-	#[clap(short, long, possible_values(&["rational", "native"]), default_value="rational")]
+	#[clap(short, long, possible_values(&["rational", "float64"]), default_value="rational")]
 	numbers: String,
+	
+	// -- Rounding settings --
+	
+	/// Round votes to specified decimal places
+	#[clap(long)]
+	round_votes: Option<usize>,
+	
+	// -- Display settings --
+	
 	/// Hide excluded candidates from results report
 	#[clap(long)]
 	hide_excluded: bool,
@@ -77,8 +92,8 @@ fn main() {
 	if cmd_opts.numbers == "rational" {
 		let election: Election<Rational> = Election::from_blt(lines);
 		count_election(election, cmd_opts);
-	} else if cmd_opts.numbers == "native" {
+	} else if cmd_opts.numbers == "float64" {
-		let election: Election<NativeFloat> = Election::from_blt(lines);
+		let election: Election<NativeFloat64> = Election::from_blt(lines);
 		count_election(election, cmd_opts);
 	}
 }
@@ -88,57 +103,28 @@ where
 	for<'r> &'r N: ops::Sub<&'r N, Output=N>,
 	for<'r> &'r N: ops::Neg<Output=N>
 {
+	// Copy applicable options
+	let stv_opts = stv::STVOptions {
+		round_votes: cmd_opts.round_votes,
+	};
+	
 	// Initialise count state
 	let mut state = CountState::new(&election);
 	
 	// Distribute first preferences
-	stv::distribute_first_preferences(&mut state);
+	stv::count_init(&mut state, &stv_opts);
-	stv::calculate_quota(&mut state);
-	stv::elect_meeting_quota(&mut state);
 	
 	// Display
 	let mut stage_num = 1;
 	make_and_print_result(stage_num, &state, &cmd_opts);
 	
 	loop {
-		state.logger.entries.clear();
+		let is_done = stv::count_one_stage(&mut state, &stv_opts);
-		state.step_all();
+		if is_done {
-		stage_num += 1;
-		
-		// Finish count
-		if stv::finished_before_stage(&state) {
 			break;
 		}
-		
+		stage_num += 1;
-		// Continue exclusions
+		make_and_print_result(stage_num, &state, &cmd_opts);
-		if stv::continue_exclusion(&mut state) {
-			stv::elect_meeting_quota(&mut state);
-			make_and_print_result(stage_num, &state, &cmd_opts);
-			continue;
-		}
-		
-		// Distribute surpluses
-		if stv::distribute_surpluses(&mut state) {
-			stv::elect_meeting_quota(&mut state);
-			make_and_print_result(stage_num, &state, &cmd_opts);
-			continue;
-		}
-		
-		// Attempt bulk election
-		if stv::bulk_elect(&mut state) {
-			stv::elect_meeting_quota(&mut state);
-			make_and_print_result(stage_num, &state, &cmd_opts);
-			continue;
-		}
-		
-		// Exclude lowest hopeful
-		if stv::exclude_hopefuls(&mut state) {
-			stv::elect_meeting_quota(&mut state);
-			make_and_print_result(stage_num, &state, &cmd_opts);
-			continue;
-		}
-		
-		todo!();
 	}
 	
 	println!("Count complete. The winning candidates are, in order of election:");

src/numbers/mod.rs

@@ -30,7 +30,7 @@ pub trait Number: NumRef + NumAssignRef + ops::Neg<Output=Self> + PartialOrd + A
 	fn new() -> Self;
 	fn from(n: usize) -> Self;
 	
-	fn floor_mut(&mut self);
+	fn floor_mut(&mut self, dps: usize);
 	
 	fn parse(s: &str) -> Self {
 		if let Ok(value) = Self::from_str_radix(s, 10) {
@@ -41,5 +41,5 @@ pub trait Number: NumRef + NumAssignRef + ops::Neg<Output=Self> + PartialOrd + A
 	}
 }
 
-pub use self::native::NativeFloat;
+pub use self::native::NativeFloat64;
 pub use self::rational::Rational;

src/numbers/native.rs

@@ -25,218 +25,223 @@ use std::num::ParseIntError;
 use std::fmt;
 use std::ops;
 
-pub struct NativeFloat(f32);
+type ImplType = f64;
 
-impl Number for NativeFloat {
+pub struct NativeFloat64(ImplType);
+
+impl Number for NativeFloat64 {
 	fn new() -> Self { Self(0.0) }
 	
-	fn from(n: usize) -> Self { Self(n as f32) }
+	fn from(n: usize) -> Self { Self(n as ImplType) }
 	
-	fn floor_mut(&mut self) { self.0 = self.0.floor() }
+	fn floor_mut(&mut self, dps: usize) {
+		let factor = 10.0_f64.powi(dps as i32);
+		self.0 = (self.0 * factor).floor() / factor;
+	}
 }
 
-impl Num for NativeFloat {
+impl Num for NativeFloat64 {
 	type FromStrRadixErr = ParseIntError;
 	
 	fn from_str_radix(str: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr> {
-		match i32::from_str_radix(str, radix) {
+		match i64::from_str_radix(str, radix) {
-			Ok(value) => Ok(Self(value as f32)),
+			Ok(value) => Ok(Self(value as ImplType)),
 			Err(err) => Err(err)
 		}
 	}
 }
 
-impl Assign for NativeFloat {
+impl Assign for NativeFloat64 {
 	fn assign(&mut self, src: Self) { self.0 = src.0 }
 }
 
-impl Assign<&NativeFloat> for NativeFloat {
+impl Assign<&NativeFloat64> for NativeFloat64 {
-	fn assign(&mut self, src: &NativeFloat) { self.0 = src.0 }
+	fn assign(&mut self, src: &NativeFloat64) { self.0 = src.0 }
 }
 
-impl Clone for NativeFloat {
+impl Clone for NativeFloat64 {
 	fn clone(&self) -> Self { Self(self.0) }
 }
 
-impl fmt::Display for NativeFloat {
+impl fmt::Display for NativeFloat64 {
 	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { self.0.fmt(f) }
 }
 
-impl One for NativeFloat {
+impl One for NativeFloat64 {
 	fn one() -> Self { Self(1.0) }
 }
 
-impl Zero for NativeFloat {
+impl Zero for NativeFloat64 {
 	fn zero() -> Self { Self::new() }
 	fn is_zero(&self) -> bool { self.0.is_zero() }
 }
 
-impl PartialEq for NativeFloat {
+impl PartialEq for NativeFloat64 {
 	fn eq(&self, _other: &Self) -> bool {
 		todo!()
 	}
 }
 
-impl PartialOrd for NativeFloat {
+impl PartialOrd for NativeFloat64 {
 	fn partial_cmp(&self, other: &Self) -> Option<Ordering> { self.0.partial_cmp(&other.0) }
 }
 
-impl ops::Neg for NativeFloat {
+impl ops::Neg for NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
 	fn neg(self) -> Self::Output { Self(-self.0) }
 }
 
-impl ops::Add for NativeFloat {
+impl ops::Add for NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
 	fn add(self, _rhs: Self) -> Self::Output {
 		todo!()
 	}
 }
 
-impl ops::Sub for NativeFloat {
+impl ops::Sub for NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
 	fn sub(self, _rhs: Self) -> Self::Output {
 		todo!()
 	}
 }
 
-impl ops::Mul for NativeFloat {
+impl ops::Mul for NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
 	fn mul(self, _rhs: Self) -> Self::Output {
 		todo!()
 	}
 }
 
-impl ops::Div for NativeFloat {
+impl ops::Div for NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
 	fn div(self, _rhs: Self) -> Self::Output {
 		todo!()
 	}
 }
 
-impl ops::Rem for NativeFloat {
+impl ops::Rem for NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
 	
 	fn rem(self, _rhs: Self) -> Self::Output {
 		todo!()
 	}
 }
 
-impl ops::Add<&NativeFloat> for NativeFloat {
+impl ops::Add<&NativeFloat64> for NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
-	fn add(self, rhs: &NativeFloat) -> Self::Output { Self(self.0 + &rhs.0) }
+	fn add(self, rhs: &NativeFloat64) -> Self::Output { Self(self.0 + &rhs.0) }
 }
 
-impl ops::Sub<&NativeFloat> for NativeFloat {
+impl ops::Sub<&NativeFloat64> for NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
-	fn sub(self, _rhs: &NativeFloat) -> Self::Output {
+	fn sub(self, _rhs: &NativeFloat64) -> Self::Output {
 		todo!()
 	}
 }
 
-impl ops::Mul<&NativeFloat> for NativeFloat {
+impl ops::Mul<&NativeFloat64> for NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
-	fn mul(self, rhs: &NativeFloat) -> Self::Output { NativeFloat(self.0 * &rhs.0) }
+	fn mul(self, rhs: &NativeFloat64) -> Self::Output { NativeFloat64(self.0 * &rhs.0) }
 }
 
-impl ops::Div<&NativeFloat> for NativeFloat {
+impl ops::Div<&NativeFloat64> for NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
-	fn div(self, rhs: &NativeFloat) -> Self::Output { NativeFloat(self.0 / &rhs.0) }
+	fn div(self, rhs: &NativeFloat64) -> Self::Output { NativeFloat64(self.0 / &rhs.0) }
 }
 
-impl ops::Rem<&NativeFloat> for NativeFloat {
+impl ops::Rem<&NativeFloat64> for NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
-	fn rem(self, _rhs: &NativeFloat) -> Self::Output {
+	fn rem(self, _rhs: &NativeFloat64) -> Self::Output {
 		todo!()
 	}
 }
 
-impl ops::AddAssign for NativeFloat {
+impl ops::AddAssign for NativeFloat64 {
 	fn add_assign(&mut self, rhs: Self) { self.0 += rhs.0 }
 }
 
-impl ops::SubAssign for NativeFloat {
+impl ops::SubAssign for NativeFloat64 {
 	fn sub_assign(&mut self, rhs: Self) { self.0 -= rhs.0 }
 }
 
-impl ops::MulAssign for NativeFloat {
+impl ops::MulAssign for NativeFloat64 {
 	fn mul_assign(&mut self, _rhs: Self) {
 		todo!()
 	}
 }
 
-impl ops::DivAssign for NativeFloat {
+impl ops::DivAssign for NativeFloat64 {
 	fn div_assign(&mut self, rhs: Self) {
 		self.0 /= &rhs.0;
 	}
 }
 
-impl ops::RemAssign for NativeFloat {
+impl ops::RemAssign for NativeFloat64 {
 	fn rem_assign(&mut self, _rhs: Self) {
 		todo!()
 	}
 }
 
-impl ops::AddAssign<&NativeFloat> for NativeFloat {
+impl ops::AddAssign<&NativeFloat64> for NativeFloat64 {
-	fn add_assign(&mut self, rhs: &NativeFloat) { self.0 += &rhs.0 }
+	fn add_assign(&mut self, rhs: &NativeFloat64) { self.0 += &rhs.0 }
 }
 
-impl ops::SubAssign<&NativeFloat> for NativeFloat {
+impl ops::SubAssign<&NativeFloat64> for NativeFloat64 {
-	fn sub_assign(&mut self, rhs: &NativeFloat) { self.0 -= &rhs.0 }
+	fn sub_assign(&mut self, rhs: &NativeFloat64) { self.0 -= &rhs.0 }
 }
 
-impl ops::MulAssign<&NativeFloat> for NativeFloat {
+impl ops::MulAssign<&NativeFloat64> for NativeFloat64 {
-	fn mul_assign(&mut self, _rhs: &NativeFloat) {
+	fn mul_assign(&mut self, _rhs: &NativeFloat64) {
 		todo!()
 	}
 }
 
-impl ops::DivAssign<&NativeFloat> for NativeFloat {
+impl ops::DivAssign<&NativeFloat64> for NativeFloat64 {
-	fn div_assign(&mut self, _rhs: &NativeFloat) {
+	fn div_assign(&mut self, _rhs: &NativeFloat64) {
 		todo!()
 	}
 }
 
-impl ops::RemAssign<&NativeFloat> for NativeFloat {
+impl ops::RemAssign<&NativeFloat64> for NativeFloat64 {
-	fn rem_assign(&mut self, _rhs: &NativeFloat) {
+	fn rem_assign(&mut self, _rhs: &NativeFloat64) {
 		todo!()
 	}
 }
 
-impl ops::Neg for &NativeFloat {
+impl ops::Neg for &NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
-	fn neg(self) -> Self::Output { NativeFloat(-&self.0) }
+	fn neg(self) -> Self::Output { NativeFloat64(-&self.0) }
 }
 
-impl ops::Add<&NativeFloat> for &NativeFloat {
+impl ops::Add<&NativeFloat64> for &NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
-	fn add(self, _rhs: &NativeFloat) -> Self::Output {
+	fn add(self, _rhs: &NativeFloat64) -> Self::Output {
 		todo!()
 	}
 }
 
-impl ops::Sub<&NativeFloat> for &NativeFloat {
+impl ops::Sub<&NativeFloat64> for &NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
-	fn sub(self, rhs: &NativeFloat) -> Self::Output { NativeFloat(&self.0 - &rhs.0) }
+	fn sub(self, rhs: &NativeFloat64) -> Self::Output { NativeFloat64(&self.0 - &rhs.0) }
 }
 
-impl ops::Mul<&NativeFloat> for &NativeFloat {
+impl ops::Mul<&NativeFloat64> for &NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
-	fn mul(self, _rhs: &NativeFloat) -> Self::Output {
+	fn mul(self, _rhs: &NativeFloat64) -> Self::Output {
 		todo!()
 	}
 }
 
-impl ops::Div<&NativeFloat> for &NativeFloat {
+impl ops::Div<&NativeFloat64> for &NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
-	fn div(self, _rhs: &NativeFloat) -> Self::Output {
+	fn div(self, _rhs: &NativeFloat64) -> Self::Output {
 		todo!()
 	}
 }
 
-impl ops::Rem<&NativeFloat> for &NativeFloat {
+impl ops::Rem<&NativeFloat64> for &NativeFloat64 {
-	type Output = NativeFloat;
+	type Output = NativeFloat64;
-	fn rem(self, _rhs: &NativeFloat) -> Self::Output {
+	fn rem(self, _rhs: &NativeFloat64) -> Self::Output {
 		todo!()
 	}
 }

src/numbers/rational.rs

@@ -31,7 +31,16 @@ impl Number for Rational {
 	
 	fn from(n: usize) -> Self { Self(rug::Rational::from(n)) }
 	
-	fn floor_mut(&mut self) { self.0.floor_mut() }
+	fn floor_mut(&mut self, dps: usize) {
+		if dps == 0 {
+			self.0.floor_mut();
+		} else {
+			let factor = rug::Rational::from(10).pow(dps as u32);
+			self.0 *= &factor;
+			self.0.floor_mut();
+			self.0 /= factor;
+		}
+	}
 }
 
 impl Num for Rational {
@@ -65,7 +74,9 @@ impl fmt::Display for Rational {
 				return f.write_str(&result);
 			} else {
 				let base = rug::Rational::from(10).pow(precision as u32);
-				let mut result = rug::Integer::from((&self.0 * base).round_ref()).to_string();
+				let mut result = rug::Integer::from((&self.0 * base).abs().round_ref()).to_string();
+				
+				let should_add_minus = (self.0 < 0) && result != "0";
 				
 				// Add leading 0s
 				result = format!("{0:0>1$}", result, precision + 1);
@@ -73,6 +84,11 @@ impl fmt::Display for Rational {
 				// Add the decimal point
 				result.insert(result.len() - precision, '.');
 				
+				// Add the sign
+				if should_add_minus {
+					result.insert(0, '-');
+				}
+				
 				return f.write_str(&result);
 			}
 		} else {

src/stv/mod.rs

@@ -23,6 +23,56 @@ use crate::election::{Candidate, CandidateState, CountCard, CountState, Parcel,
 use std::collections::HashMap;
 use std::ops::{Neg, Sub};
 
+pub struct STVOptions {
+	pub round_votes: Option<usize>,
+}
+
+pub fn count_init<N: Number>(mut state: &mut CountState<'_, N>, _opts: &STVOptions) {
+	distribute_first_preferences(&mut state);
+	calculate_quota(&mut state);
+	elect_meeting_quota(&mut state);
+}
+
+pub fn count_one_stage<N: Number>(mut state: &mut CountState<'_, N>, opts: &STVOptions) -> bool
+where
+	for<'r> &'r N: Sub<&'r N, Output=N>,
+	for<'r> &'r N: Neg<Output=N>
+{
+	state.logger.entries.clear();
+	state.step_all();
+	
+	// Finish count
+	if finished_before_stage(&state) {
+		return true;
+	}
+	
+	// Continue exclusions
+	if continue_exclusion(&mut state, &opts) {
+		elect_meeting_quota(&mut state);
+		return false;
+	}
+	
+	// Distribute surpluses
+	if distribute_surpluses(&mut state, &opts) {
+		elect_meeting_quota(&mut state);
+		return false;
+	}
+	
+	// Attempt bulk election
+	if bulk_elect(&mut state) {
+		elect_meeting_quota(&mut state);
+		return false;
+	}
+	
+	// Exclude lowest hopeful
+	if exclude_hopefuls(&mut state, &opts) {
+		elect_meeting_quota(&mut state);
+		return false;
+	}
+	
+	todo!();
+}
+
 struct NextPreferencesResult<'a, N> {
 	candidates: HashMap<&'a Candidate, NextPreferencesEntry<'a, N>>,
 	exhausted: NextPreferencesEntry<'a, N>,
@@ -88,7 +138,7 @@ fn next_preferences<'a, N: Number>(state: &CountState<'a, N>, votes: Vec<Vote<'a
 	return result;
 }
 
-pub fn distribute_first_preferences<N: Number>(state: &mut CountState<N>) {
+fn distribute_first_preferences<N: Number>(state: &mut CountState<N>) {
 	let votes = state.election.ballots.iter().map(|b| Vote {
 		ballot: b,
 		value: b.orig_value.clone(),
@@ -115,7 +165,7 @@ pub fn distribute_first_preferences<N: Number>(state: &mut CountState<N>) {
 	state.logger.log_literal("First preferences distributed.".to_string());
 }
 
-pub fn calculate_quota<N: Number>(state: &mut CountState<N>) {
+fn calculate_quota<N: Number>(state: &mut CountState<N>) {
 	let mut log = String::new();
 	
 	// Calculate the total vote
@@ -127,7 +177,7 @@ pub fn calculate_quota<N: Number>(state: &mut CountState<N>) {
 	
 	// TODO: Different rounding rules
 	state.quota += N::one();
-	state.quota.floor_mut();
+	state.quota.floor_mut(0);
 	log.push_str(format!("{:.2}.", state.quota).as_str());
 	
 	state.logger.log_literal(log);
@@ -138,7 +188,7 @@ fn meets_quota<N: Number>(quota: &N, count_card: &CountCard<N>) -> bool {
 	return count_card.votes >= *quota;
 }
 
-pub fn elect_meeting_quota<N: Number>(state: &mut CountState<N>) {
+fn elect_meeting_quota<N: Number>(state: &mut CountState<N>) {
 	let quota = &state.quota; // Have to do this or else the borrow checker gets confused
 	let mut cands_meeting_quota: Vec<(&&Candidate, &mut CountCard<N>)> = state.candidates.iter_mut()
 		.filter(|(_, cc)| cc.state == CandidateState::HOPEFUL && meets_quota(quota, cc))
@@ -162,7 +212,7 @@ pub fn elect_meeting_quota<N: Number>(state: &mut CountState<N>) {
 	}
 }
 
-pub fn distribute_surpluses<N: Number>(state: &mut CountState<N>) -> bool
+fn distribute_surpluses<N: Number>(state: &mut CountState<N>, opts: &STVOptions) -> bool
 where
 	for<'r> &'r N: Sub<&'r N, Output=N>,
 	for<'r> &'r N: Neg<Output=N>
@@ -178,14 +228,14 @@ where
 		// Distribute top candidate's surplus
 		// TODO: Handle ties
 		let elected_candidate = has_surplus.first_mut().unwrap().0;
-		distribute_surplus(state, elected_candidate);
+		distribute_surplus(state, &opts, elected_candidate);
 		
 		return true;
 	}
 	return false;
 }
 
-fn distribute_surplus<N: Number>(state: &mut CountState<N>, elected_candidate: &Candidate)
+fn distribute_surplus<N: Number>(state: &mut CountState<N>, opts: &STVOptions, elected_candidate: &Candidate)
 where
 	for<'r> &'r N: Sub<&'r N, Output=N>,
 	for<'r> &'r N: Neg<Output=N>
@@ -225,8 +275,9 @@ where
 		
 		let mut candidate_transfers = entry.num_ballots * &surplus / &result.total_ballots;
 		// Round transfers
-		// TODO: Make configurable
+		if let Some(dps) = opts.round_votes {
-		candidate_transfers.floor_mut();
+			candidate_transfers.floor_mut(dps);
+		}
 		count_card.transfer(&candidate_transfers);
 		checksum += candidate_transfers;
 	}
@@ -236,8 +287,9 @@ where
 	state.exhausted.parcels.push(parcel);
 	
 	let mut exhausted_transfers = result.exhausted.num_ballots * &surplus / &result.total_ballots;
-	// TODO: Make configurable
+	if let Some(dps) = opts.round_votes {
-	exhausted_transfers.floor_mut();
+		exhausted_transfers.floor_mut(dps);
+	}
 	state.exhausted.transfer(&exhausted_transfers);
 	checksum += exhausted_transfers;
 	
@@ -251,7 +303,7 @@ where
 	state.loss_fraction.transfer(&-checksum);
 }
 
-pub fn bulk_elect<N: Number>(state: &mut CountState<N>) -> bool {
+fn bulk_elect<N: Number>(state: &mut CountState<N>) -> bool {
 	if state.election.candidates.len() - state.num_excluded <= state.election.seats {
 		state.kind = None;
 		state.title = "Bulk election".to_string();
@@ -281,7 +333,7 @@ pub fn bulk_elect<N: Number>(state: &mut CountState<N>) -> bool {
 	return false;
 }
 
-pub fn exclude_hopefuls<N: Number>(state: &mut CountState<N>) -> bool {
+fn exclude_hopefuls<N: Number>(state: &mut CountState<N>, opts: &STVOptions) -> bool {
 	let mut hopefuls: Vec<(&&Candidate, &CountCard<N>)> = state.candidates.iter()
 		.filter(|(_, cc)| cc.state == CandidateState::HOPEFUL)
 		.collect();
@@ -301,12 +353,12 @@ pub fn exclude_hopefuls<N: Number>(state: &mut CountState<N>) -> bool {
 		vec![&excluded_candidate.name]
 	);
 	
-	exclude_candidate(state, excluded_candidate);
+	exclude_candidate(state, opts, excluded_candidate);
 	
 	return true;
 }
 
-pub fn continue_exclusion<N: Number>(state: &mut CountState<N>) -> bool {
+fn continue_exclusion<N: Number>(state: &mut CountState<N>, opts: &STVOptions) -> bool {
 	let mut excluded_with_votes: Vec<(&&Candidate, &CountCard<N>)> = state.candidates.iter()
 		.filter(|(_, cc)| cc.state == CandidateState::EXCLUDED && !cc.votes.is_zero())
 		.collect();
@@ -323,14 +375,14 @@ pub fn continue_exclusion<N: Number>(state: &mut CountState<N>) -> bool {
 			vec![&excluded_candidate.name]
 		);
 		
-		exclude_candidate(state, excluded_candidate);
+		exclude_candidate(state, opts, excluded_candidate);
 		return true;
 	}
 	
 	return false;
 }
 
-fn exclude_candidate<N: Number>(state: &mut CountState<N>, excluded_candidate: &Candidate) {
+fn exclude_candidate<N: Number>(state: &mut CountState<N>, opts: &STVOptions, excluded_candidate: &Candidate) {
 	let count_card = state.candidates.get_mut(excluded_candidate).unwrap();
 	count_card.state = CandidateState::EXCLUDED;
 	state.num_excluded += 1;
@@ -352,9 +404,10 @@ fn exclude_candidate<N: Number>(state: &mut CountState<N>, excluded_candidate: &
 		count_card.parcels.push(parcel);
 		
 		// Round transfers
-		// TODO: Make configurable
 		let mut candidate_transfers = entry.num_votes;
-		candidate_transfers.floor_mut();
+		if let Some(dps) = opts.round_votes {
+			candidate_transfers.floor_mut(dps);
+		}
 		count_card.transfer(&candidate_transfers);
 		checksum += candidate_transfers;
 	}
@@ -364,8 +417,9 @@ fn exclude_candidate<N: Number>(state: &mut CountState<N>, excluded_candidate: &
 	state.exhausted.parcels.push(parcel);
 	
 	let mut exhausted_transfers = result.exhausted.num_votes;
-	// TODO: Make configurable
+	if let Some(dps) = opts.round_votes {
-	exhausted_transfers.floor_mut();
+		exhausted_transfers.floor_mut(dps);
+	}
 	state.exhausted.transfer(&exhausted_transfers);
 	checksum += exhausted_transfers;
 	
@@ -379,7 +433,7 @@ fn exclude_candidate<N: Number>(state: &mut CountState<N>, excluded_candidate: &
 	state.loss_fraction.transfer(&-checksum);
 }
 
-pub fn finished_before_stage<N: Number>(state: &CountState<N>) -> bool {
+fn finished_before_stage<N: Number>(state: &CountState<N>) -> bool {
 	if state.num_elected >= state.election.seats {
 		return true;
 	}