diff options
author | RunasSudo <runassudo@yingtongli.me> | 2021-07-14 16:36:37 +1000 |
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committer | RunasSudo <runassudo@yingtongli.me> | 2021-10-19 14:52:08 +1100 |
commit | 414a1482c3a6681025ffa5040966021658683e1c (patch) | |
tree | 1c5bc39cfd483f58fd1bdbd4a2d94ecb3e3d1252 /src/numbers/dynnum.rs | |
parent | 5a535743668e88bdba55480a927c704e75ed8399 (diff) |
Implement dynamic dispatch for different number types
Diffstat (limited to 'src/numbers/dynnum.rs')
-rw-r--r-- | src/numbers/dynnum.rs | 513 |
1 files changed, 513 insertions, 0 deletions
diff --git a/src/numbers/dynnum.rs b/src/numbers/dynnum.rs new file mode 100644 index 0000000..eab11c6 --- /dev/null +++ b/src/numbers/dynnum.rs @@ -0,0 +1,513 @@ +/* OpenTally: Open-source election vote counting + * Copyright © 2021 Lee Yingtong Li (RunasSudo) + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +use super::{Assign, Fixed, GuardedFixed, NativeFloat64, Number, Rational}; + +use num_traits::{Num, One, Zero}; +//use wasm_bindgen::prelude::wasm_bindgen; + +use std::cmp::{Ord, Ordering}; +use std::fmt; +use std::mem::ManuallyDrop; +use std::ops::{self, Deref, DerefMut}; + +/// Represents the underlying implementation for [DynNum]s +//#[wasm_bindgen] +pub enum NumKind { + /// See [crate::numbers::fixed] + Fixed, + /// See [crate::numbers::gfixed] + GuardedFixed, + /// See [crate::numbers::native] + NativeFloat64, + /// See [crate::numbers::rational_rug] or [crate::numbers::rational_num] + Rational, +} + +/// Determines which underlying implementation to use +static mut KIND: NumKind = NumKind::Fixed; + +/// Returns which underlying implementation is in use +#[inline] +fn get_kind() -> &'static NumKind { + unsafe { + return &KIND; + } +} + +/// A wrapper for different numeric types using dynamic dispatch +pub union DynNum { + fixed: ManuallyDrop<Fixed>, + gfixed: ManuallyDrop<GuardedFixed>, + float64: NativeFloat64, + rational: ManuallyDrop<Rational>, +} + +impl DynNum { + /// Set which underlying implementation to use + pub fn set_kind(kind: NumKind) { + unsafe { + KIND = kind; + } + } +} + +macro_rules! impl_1arg_nowrap { + ($self:expr, $arg:expr, $func:ident) => { + // Safety: Access only correct union field + unsafe { + match get_kind() { + NumKind::Fixed => { + $self.fixed.$func($arg) + } + NumKind::GuardedFixed => { + $self.gfixed.$func($arg) + } + NumKind::NativeFloat64 => { + $self.float64.$func($arg) + } + NumKind::Rational => { + $self.rational.$func($arg) + } + } + } + } +} + +macro_rules! impl_assoc_nowrap { + ($func:ident) => { + match get_kind() { + NumKind::Fixed => { + Fixed::$func() + } + NumKind::GuardedFixed => { + GuardedFixed::$func() + } + NumKind::NativeFloat64 => { + NativeFloat64::$func() + } + NumKind::Rational => { + Rational::$func() + } + } + } +} + +impl Number for DynNum { + fn new() -> Self { + match get_kind() { + NumKind::Fixed => { + DynNum { fixed: ManuallyDrop::new(Fixed::new()) } + } + NumKind::GuardedFixed => { + DynNum { gfixed: ManuallyDrop::new(GuardedFixed::new()) } + } + NumKind::NativeFloat64 => { + DynNum { float64: NativeFloat64::new() } + } + NumKind::Rational => { + DynNum { rational: ManuallyDrop::new(Rational::new()) } + } + } + } + + fn describe() -> String { impl_assoc_nowrap!(describe) } + fn pow_assign(&mut self, exponent: i32) { impl_1arg_nowrap!(self, exponent, pow_assign) } + fn floor_mut(&mut self, dps: usize) { impl_1arg_nowrap!(self, dps, floor_mut) } + fn ceil_mut(&mut self, dps: usize) { impl_1arg_nowrap!(self, dps, ceil_mut) } + fn round_mut(&mut self, dps: usize) { impl_1arg_nowrap!(self, dps, round_mut) } +} + +impl Drop for DynNum { + fn drop(&mut self) { + // Safety: Access only correct union field + unsafe { + match get_kind() { + NumKind::Fixed => { + ManuallyDrop::drop(&mut self.fixed); + } + NumKind::GuardedFixed => { + ManuallyDrop::drop(&mut self.gfixed); + } + NumKind::NativeFloat64 => {} + NumKind::Rational => { + ManuallyDrop::drop(&mut self.rational); + } + } + } + } +} + +macro_rules! impl_0arg_wrap { + ($self:expr, $func:ident) => { + // Safety: Access only correct union field + unsafe { + match get_kind() { + NumKind::Fixed => { + DynNum { fixed: ManuallyDrop::new($self.fixed.deref().$func()) } + } + NumKind::GuardedFixed => { + DynNum { gfixed: ManuallyDrop::new($self.gfixed.deref().$func()) } + } + NumKind::NativeFloat64 => { + DynNum { float64: $self.float64.$func() } + } + NumKind::Rational => { + DynNum { rational: ManuallyDrop::new($self.rational.deref().$func()) } + } + } + } + } +} + +impl Clone for DynNum { + fn clone(&self) -> Self { impl_0arg_wrap!(self, clone) } +} + +impl Num for DynNum { + type FromStrRadixErr = Self; // TODO + + fn from_str_radix(str: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr> { + match get_kind() { + NumKind::Fixed => { + Ok(DynNum { fixed: ManuallyDrop::new(Fixed::from_str_radix(str, radix).unwrap()) }) + } + NumKind::GuardedFixed => { + Ok(DynNum { gfixed: ManuallyDrop::new(GuardedFixed::from_str_radix(str, radix).unwrap()) }) + } + NumKind::NativeFloat64 => { + Ok(DynNum { float64: NativeFloat64::from_str_radix(str, radix).unwrap() }) + } + NumKind::Rational => { + Ok(DynNum { rational: ManuallyDrop::new(Rational::from_str_radix(str, radix).unwrap()) }) + } + } + } +} + +macro_rules! impl_1other_nowrap { + ($self:expr, $rhs:expr, $func:ident) => { + // Safety: Access only correct union field + unsafe { + match get_kind() { + NumKind::Fixed => { + $self.fixed.deref().$func($rhs.fixed.deref()) + } + NumKind::GuardedFixed => { + $self.gfixed.deref().$func($rhs.gfixed.deref()) + } + NumKind::NativeFloat64 => { + $self.float64.$func(&$rhs.float64) + } + NumKind::Rational => { + $self.rational.deref().$func($rhs.rational.deref()) + } + } + } + } +} + +macro_rules! impl_1other_nowrap_mut { + ($self:expr, $rhs:expr, $func:ident) => { + // Safety: Access only correct union field + unsafe { + match get_kind() { + NumKind::Fixed => { + $self.fixed.deref_mut().$func($rhs.fixed.deref()) + } + NumKind::GuardedFixed => { + $self.gfixed.deref_mut().$func($rhs.gfixed.deref()) + } + NumKind::NativeFloat64 => { + $self.float64.$func(&$rhs.float64) + } + NumKind::Rational => { + $self.rational.deref_mut().$func($rhs.rational.deref()) + } + } + } + } +} + +impl Assign for DynNum { + fn assign(&mut self, src: Self) { impl_1other_nowrap_mut!(self, src, assign) } +} + +impl Assign<&Self> for DynNum { + fn assign(&mut self, src: &Self) { impl_1other_nowrap_mut!(self, src, assign) } +} + +impl From<usize> for DynNum { + fn from(n: usize) -> Self { + match get_kind() { + NumKind::Fixed => { + DynNum { fixed: ManuallyDrop::new(Fixed::from(n)) } + } + NumKind::GuardedFixed => { + DynNum { gfixed: ManuallyDrop::new(GuardedFixed::from(n)) } + } + NumKind::NativeFloat64 => { + DynNum { float64: NativeFloat64::from(n) } + } + NumKind::Rational => { + DynNum { rational: ManuallyDrop::new(Rational::from(n)) } + } + } + } +} + +impl fmt::Display for DynNum { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { impl_1arg_nowrap!(self, f, fmt) } +} + +impl fmt::Debug for DynNum { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { impl_1arg_nowrap!(self, f, fmt) } +} + +impl PartialEq for DynNum { + fn eq(&self, other: &Self) -> bool { impl_1other_nowrap!(self, other, eq) } +} + +impl Eq for DynNum {} + +impl PartialOrd for DynNum { + fn partial_cmp(&self, other: &Self) -> Option<Ordering> { impl_1other_nowrap!(self, other, partial_cmp) } +} + +impl Ord for DynNum { + fn cmp(&self, other: &Self) -> Ordering { impl_1other_nowrap!(self, other, cmp) } +} + +macro_rules! impl_assoc_wrap { + ($func:ident) => { + match get_kind() { + NumKind::Fixed => { + DynNum { fixed: ManuallyDrop::new(Fixed::$func()) } + } + NumKind::GuardedFixed => { + DynNum { gfixed: ManuallyDrop::new(GuardedFixed::$func()) } + } + NumKind::NativeFloat64 => { + DynNum { float64: NativeFloat64::$func() } + } + NumKind::Rational => { + DynNum { rational: ManuallyDrop::new(Rational::$func()) } + } + } + } +} + +impl One for DynNum { + fn one() -> Self { impl_assoc_wrap!(one) } +} + +macro_rules! impl_0arg_nowrap { + ($self:expr, $func:ident) => { + // Safety: Access only correct union field + unsafe { + match get_kind() { + NumKind::Fixed => { + $self.fixed.deref().$func() + } + NumKind::GuardedFixed => { + $self.gfixed.deref().$func() + } + NumKind::NativeFloat64 => { + $self.float64.$func() + } + NumKind::Rational => { + $self.rational.deref().$func() + } + } + } + } +} + +impl Zero for DynNum { + fn zero() -> Self { impl_assoc_wrap!(zero) } + + fn is_zero(&self) -> bool { impl_0arg_nowrap!(self, is_zero) } +} + +impl ops::Neg for DynNum { + type Output = Self; + fn neg(self) -> Self::Output { impl_0arg_wrap!(self, neg) } +} + +macro_rules! impl_1other_wrap { + ($self:expr, $rhs:expr, $func:ident) => { + // Safety: Access only correct union field + unsafe { + match get_kind() { + NumKind::Fixed => { + DynNum { fixed: ManuallyDrop::new($self.fixed.deref().$func($rhs.fixed.deref())) } + } + NumKind::GuardedFixed => { + DynNum { gfixed: ManuallyDrop::new($self.gfixed.deref().$func($rhs.gfixed.deref())) } + } + NumKind::NativeFloat64 => { + DynNum { float64: $self.float64.$func($rhs.float64) } + } + NumKind::Rational => { + DynNum { rational: ManuallyDrop::new($self.rational.deref().$func($rhs.rational.deref())) } + } + } + } + } +} + +impl ops::Add for DynNum { + type Output = Self; + fn add(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, add) } +} + +impl ops::Sub for DynNum { + type Output = Self; + fn sub(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, sub) } +} + +impl ops::Mul for DynNum { + type Output = Self; + fn mul(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, mul) } +} + +impl ops::Div for DynNum { + type Output = Self; + fn div(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, div) } +} + +impl ops::Rem for DynNum { + type Output = Self; + fn rem(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, rem) } +} + +impl ops::Add<&Self> for DynNum { + type Output = Self; + fn add(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, add) } +} + +impl ops::Sub<&Self> for DynNum { + type Output = Self; + fn sub(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, sub) } +} + +impl ops::Mul<&Self> for DynNum { + type Output = Self; + fn mul(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, mul) } +} + +impl ops::Div<&Self> for DynNum { + type Output = Self; + fn div(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, div) } +} + +impl ops::Rem<&Self> for DynNum { + type Output = Self; + fn rem(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, rem) } +} + +impl ops::AddAssign for DynNum { + fn add_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, add_assign) } +} + +impl ops::SubAssign for DynNum { + fn sub_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, sub_assign) } +} + +impl ops::MulAssign for DynNum { + fn mul_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, mul_assign) } +} + +impl ops::DivAssign for DynNum { + fn div_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, div_assign) } +} + +impl ops::RemAssign for DynNum { + fn rem_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, rem_assign) } +} + +impl ops::AddAssign<&Self> for DynNum { + fn add_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, add_assign) } +} + +impl ops::SubAssign<&Self> for DynNum { + fn sub_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, sub_assign) } +} + +impl ops::MulAssign<&Self> for DynNum { + fn mul_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, mul_assign) } +} + +impl ops::DivAssign<&Self> for DynNum { + fn div_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, div_assign) } +} + +impl ops::RemAssign<&Self> for DynNum { + fn rem_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, rem_assign) } +} + +impl ops::Neg for &DynNum { + type Output = DynNum; + fn neg(self) -> Self::Output { impl_0arg_wrap!(self, neg) } +} + +impl ops::Add<Self> for &DynNum { + type Output = DynNum; + fn add(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, add) } +} + +impl ops::Sub<Self> for &DynNum { + type Output = DynNum; + fn sub(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, sub) } +} + +impl ops::Mul<Self> for &DynNum { + type Output = DynNum; + fn mul(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, mul) } +} + +impl ops::Div<Self> for &DynNum { + type Output = DynNum; + fn div(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, div) } +} + +impl ops::Rem<Self> for &DynNum { + type Output = DynNum; + fn rem(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, rem) } +} + +/* +impl ops::Add<&&Rational> for &Rational { + +} + +impl ops::Sub<&&Rational> for &Rational { + +} + +impl ops::Mul<&&Rational> for &Rational { + +} + +impl ops::Div<&&Rational> for &Rational { + +} + +impl ops::Rem<&&Rational> for &Rational { + +} +*/ |