514 lines
13 KiB
Rust
514 lines
13 KiB
Rust
/* OpenTally: Open-source election vote counting
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* Copyright © 2021 Lee Yingtong Li (RunasSudo)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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use super::{Assign, Fixed, GuardedFixed, NativeFloat64, Number, Rational};
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use num_traits::{Num, One, Zero};
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//use wasm_bindgen::prelude::wasm_bindgen;
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use std::cmp::{Ord, Ordering};
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use std::fmt;
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use std::mem::ManuallyDrop;
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use std::ops::{self, Deref, DerefMut};
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/// Represents the underlying implementation for [DynNum]s
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//#[wasm_bindgen]
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pub enum NumKind {
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/// See [crate::numbers::fixed]
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Fixed,
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/// See [crate::numbers::gfixed]
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GuardedFixed,
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/// See [crate::numbers::native]
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NativeFloat64,
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/// See [crate::numbers::rational_rug] or [crate::numbers::rational_num]
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Rational,
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}
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/// Determines which underlying implementation to use
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static mut KIND: NumKind = NumKind::Fixed;
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/// Returns which underlying implementation is in use
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#[inline]
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fn get_kind() -> &'static NumKind {
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unsafe {
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return &KIND;
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}
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}
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/// A wrapper for different numeric types using dynamic dispatch
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pub union DynNum {
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fixed: ManuallyDrop<Fixed>,
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gfixed: ManuallyDrop<GuardedFixed>,
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float64: NativeFloat64,
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rational: ManuallyDrop<Rational>,
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}
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impl DynNum {
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/// Set which underlying implementation to use
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pub fn set_kind(kind: NumKind) {
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unsafe {
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KIND = kind;
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}
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}
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}
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macro_rules! impl_1arg_nowrap {
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($self:expr, $arg:expr, $func:ident) => {
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// Safety: Access only correct union field
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unsafe {
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match get_kind() {
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NumKind::Fixed => {
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$self.fixed.$func($arg)
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}
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NumKind::GuardedFixed => {
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$self.gfixed.$func($arg)
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}
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NumKind::NativeFloat64 => {
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$self.float64.$func($arg)
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}
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NumKind::Rational => {
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$self.rational.$func($arg)
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}
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}
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}
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}
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}
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macro_rules! impl_assoc_nowrap {
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($func:ident) => {
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match get_kind() {
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NumKind::Fixed => {
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Fixed::$func()
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}
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NumKind::GuardedFixed => {
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GuardedFixed::$func()
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}
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NumKind::NativeFloat64 => {
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NativeFloat64::$func()
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}
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NumKind::Rational => {
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Rational::$func()
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}
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}
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}
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}
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impl Number for DynNum {
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fn new() -> Self {
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match get_kind() {
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NumKind::Fixed => {
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DynNum { fixed: ManuallyDrop::new(Fixed::new()) }
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}
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NumKind::GuardedFixed => {
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DynNum { gfixed: ManuallyDrop::new(GuardedFixed::new()) }
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}
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NumKind::NativeFloat64 => {
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DynNum { float64: NativeFloat64::new() }
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}
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NumKind::Rational => {
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DynNum { rational: ManuallyDrop::new(Rational::new()) }
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}
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}
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}
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fn describe() -> String { impl_assoc_nowrap!(describe) }
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fn pow_assign(&mut self, exponent: i32) { impl_1arg_nowrap!(self, exponent, pow_assign) }
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fn floor_mut(&mut self, dps: usize) { impl_1arg_nowrap!(self, dps, floor_mut) }
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fn ceil_mut(&mut self, dps: usize) { impl_1arg_nowrap!(self, dps, ceil_mut) }
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fn round_mut(&mut self, dps: usize) { impl_1arg_nowrap!(self, dps, round_mut) }
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}
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impl Drop for DynNum {
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fn drop(&mut self) {
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// Safety: Access only correct union field
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unsafe {
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match get_kind() {
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NumKind::Fixed => {
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ManuallyDrop::drop(&mut self.fixed);
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}
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NumKind::GuardedFixed => {
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ManuallyDrop::drop(&mut self.gfixed);
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}
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NumKind::NativeFloat64 => {}
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NumKind::Rational => {
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ManuallyDrop::drop(&mut self.rational);
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}
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}
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}
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}
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}
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macro_rules! impl_0arg_wrap {
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($self:expr, $func:ident) => {
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// Safety: Access only correct union field
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unsafe {
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match get_kind() {
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NumKind::Fixed => {
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DynNum { fixed: ManuallyDrop::new($self.fixed.deref().$func()) }
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}
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NumKind::GuardedFixed => {
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DynNum { gfixed: ManuallyDrop::new($self.gfixed.deref().$func()) }
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}
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NumKind::NativeFloat64 => {
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DynNum { float64: $self.float64.$func() }
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}
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NumKind::Rational => {
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DynNum { rational: ManuallyDrop::new($self.rational.deref().$func()) }
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}
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}
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}
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}
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}
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impl Clone for DynNum {
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fn clone(&self) -> Self { impl_0arg_wrap!(self, clone) }
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}
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impl Num for DynNum {
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type FromStrRadixErr = Self; // TODO
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fn from_str_radix(str: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr> {
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match get_kind() {
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NumKind::Fixed => {
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Ok(DynNum { fixed: ManuallyDrop::new(Fixed::from_str_radix(str, radix).unwrap()) })
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}
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NumKind::GuardedFixed => {
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Ok(DynNum { gfixed: ManuallyDrop::new(GuardedFixed::from_str_radix(str, radix).unwrap()) })
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}
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NumKind::NativeFloat64 => {
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Ok(DynNum { float64: NativeFloat64::from_str_radix(str, radix).unwrap() })
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}
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NumKind::Rational => {
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Ok(DynNum { rational: ManuallyDrop::new(Rational::from_str_radix(str, radix).unwrap()) })
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}
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}
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}
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}
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macro_rules! impl_1other_nowrap {
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($self:expr, $rhs:expr, $func:ident) => {
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// Safety: Access only correct union field
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unsafe {
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match get_kind() {
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NumKind::Fixed => {
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$self.fixed.deref().$func($rhs.fixed.deref())
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}
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NumKind::GuardedFixed => {
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$self.gfixed.deref().$func($rhs.gfixed.deref())
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}
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NumKind::NativeFloat64 => {
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$self.float64.$func(&$rhs.float64)
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}
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NumKind::Rational => {
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$self.rational.deref().$func($rhs.rational.deref())
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}
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}
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}
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}
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}
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macro_rules! impl_1other_nowrap_mut {
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($self:expr, $rhs:expr, $func:ident) => {
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// Safety: Access only correct union field
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unsafe {
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match get_kind() {
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NumKind::Fixed => {
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$self.fixed.deref_mut().$func($rhs.fixed.deref())
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}
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NumKind::GuardedFixed => {
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$self.gfixed.deref_mut().$func($rhs.gfixed.deref())
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}
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NumKind::NativeFloat64 => {
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$self.float64.$func(&$rhs.float64)
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}
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NumKind::Rational => {
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$self.rational.deref_mut().$func($rhs.rational.deref())
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}
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}
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}
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}
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}
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impl Assign for DynNum {
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fn assign(&mut self, src: Self) { impl_1other_nowrap_mut!(self, src, assign) }
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}
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impl Assign<&Self> for DynNum {
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fn assign(&mut self, src: &Self) { impl_1other_nowrap_mut!(self, src, assign) }
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}
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impl From<usize> for DynNum {
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fn from(n: usize) -> Self {
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match get_kind() {
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NumKind::Fixed => {
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DynNum { fixed: ManuallyDrop::new(Fixed::from(n)) }
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}
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NumKind::GuardedFixed => {
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DynNum { gfixed: ManuallyDrop::new(GuardedFixed::from(n)) }
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}
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NumKind::NativeFloat64 => {
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DynNum { float64: NativeFloat64::from(n) }
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}
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NumKind::Rational => {
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DynNum { rational: ManuallyDrop::new(Rational::from(n)) }
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}
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}
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}
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}
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impl fmt::Display for DynNum {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { impl_1arg_nowrap!(self, f, fmt) }
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}
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impl fmt::Debug for DynNum {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { impl_1arg_nowrap!(self, f, fmt) }
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}
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impl PartialEq for DynNum {
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fn eq(&self, other: &Self) -> bool { impl_1other_nowrap!(self, other, eq) }
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}
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impl Eq for DynNum {}
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impl PartialOrd for DynNum {
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fn partial_cmp(&self, other: &Self) -> Option<Ordering> { impl_1other_nowrap!(self, other, partial_cmp) }
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}
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impl Ord for DynNum {
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fn cmp(&self, other: &Self) -> Ordering { impl_1other_nowrap!(self, other, cmp) }
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}
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macro_rules! impl_assoc_wrap {
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($func:ident) => {
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match get_kind() {
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NumKind::Fixed => {
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DynNum { fixed: ManuallyDrop::new(Fixed::$func()) }
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}
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NumKind::GuardedFixed => {
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DynNum { gfixed: ManuallyDrop::new(GuardedFixed::$func()) }
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}
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NumKind::NativeFloat64 => {
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DynNum { float64: NativeFloat64::$func() }
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}
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NumKind::Rational => {
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DynNum { rational: ManuallyDrop::new(Rational::$func()) }
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}
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}
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}
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}
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impl One for DynNum {
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fn one() -> Self { impl_assoc_wrap!(one) }
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}
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macro_rules! impl_0arg_nowrap {
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($self:expr, $func:ident) => {
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// Safety: Access only correct union field
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unsafe {
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match get_kind() {
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NumKind::Fixed => {
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$self.fixed.deref().$func()
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}
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NumKind::GuardedFixed => {
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$self.gfixed.deref().$func()
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}
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NumKind::NativeFloat64 => {
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$self.float64.$func()
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}
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NumKind::Rational => {
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$self.rational.deref().$func()
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}
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}
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}
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}
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}
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impl Zero for DynNum {
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fn zero() -> Self { impl_assoc_wrap!(zero) }
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fn is_zero(&self) -> bool { impl_0arg_nowrap!(self, is_zero) }
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}
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impl ops::Neg for DynNum {
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type Output = Self;
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fn neg(self) -> Self::Output { impl_0arg_wrap!(self, neg) }
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}
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macro_rules! impl_1other_wrap {
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($self:expr, $rhs:expr, $func:ident) => {
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// Safety: Access only correct union field
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unsafe {
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match get_kind() {
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NumKind::Fixed => {
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DynNum { fixed: ManuallyDrop::new($self.fixed.deref().$func($rhs.fixed.deref())) }
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}
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NumKind::GuardedFixed => {
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DynNum { gfixed: ManuallyDrop::new($self.gfixed.deref().$func($rhs.gfixed.deref())) }
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}
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NumKind::NativeFloat64 => {
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DynNum { float64: $self.float64.$func($rhs.float64) }
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}
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NumKind::Rational => {
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DynNum { rational: ManuallyDrop::new($self.rational.deref().$func($rhs.rational.deref())) }
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}
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}
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}
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}
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}
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impl ops::Add for DynNum {
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type Output = Self;
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fn add(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, add) }
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}
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impl ops::Sub for DynNum {
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type Output = Self;
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fn sub(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, sub) }
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}
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impl ops::Mul for DynNum {
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type Output = Self;
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fn mul(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, mul) }
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}
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impl ops::Div for DynNum {
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type Output = Self;
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fn div(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, div) }
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}
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impl ops::Rem for DynNum {
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type Output = Self;
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fn rem(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, rem) }
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}
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impl ops::Add<&Self> for DynNum {
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type Output = Self;
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fn add(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, add) }
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}
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impl ops::Sub<&Self> for DynNum {
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type Output = Self;
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fn sub(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, sub) }
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}
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impl ops::Mul<&Self> for DynNum {
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type Output = Self;
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fn mul(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, mul) }
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}
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impl ops::Div<&Self> for DynNum {
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type Output = Self;
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fn div(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, div) }
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}
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impl ops::Rem<&Self> for DynNum {
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type Output = Self;
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fn rem(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, rem) }
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}
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impl ops::AddAssign for DynNum {
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fn add_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, add_assign) }
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}
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impl ops::SubAssign for DynNum {
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fn sub_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, sub_assign) }
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}
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impl ops::MulAssign for DynNum {
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fn mul_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, mul_assign) }
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}
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impl ops::DivAssign for DynNum {
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fn div_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, div_assign) }
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}
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impl ops::RemAssign for DynNum {
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fn rem_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, rem_assign) }
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}
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impl ops::AddAssign<&Self> for DynNum {
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fn add_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, add_assign) }
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}
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impl ops::SubAssign<&Self> for DynNum {
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fn sub_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, sub_assign) }
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}
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impl ops::MulAssign<&Self> for DynNum {
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fn mul_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, mul_assign) }
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}
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impl ops::DivAssign<&Self> for DynNum {
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fn div_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, div_assign) }
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}
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impl ops::RemAssign<&Self> for DynNum {
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fn rem_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, rem_assign) }
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}
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impl ops::Neg for &DynNum {
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type Output = DynNum;
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fn neg(self) -> Self::Output { impl_0arg_wrap!(self, neg) }
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}
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impl ops::Add<Self> for &DynNum {
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type Output = DynNum;
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fn add(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, add) }
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}
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impl ops::Sub<Self> for &DynNum {
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type Output = DynNum;
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fn sub(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, sub) }
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}
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impl ops::Mul<Self> for &DynNum {
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type Output = DynNum;
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fn mul(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, mul) }
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}
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impl ops::Div<Self> for &DynNum {
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type Output = DynNum;
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fn div(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, div) }
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}
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impl ops::Rem<Self> for &DynNum {
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type Output = DynNum;
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fn rem(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, rem) }
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}
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/*
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impl ops::Add<&&Rational> for &Rational {
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}
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impl ops::Sub<&&Rational> for &Rational {
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}
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impl ops::Mul<&&Rational> for &Rational {
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}
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impl ops::Div<&&Rational> for &Rational {
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}
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impl ops::Rem<&&Rational> for &Rational {
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}
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*/
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