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|
1/* OpenTally: Open-source election vote counting
2 * Copyright © 2021 Lee Yingtong Li (RunasSudo)
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU Affero General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU Affero General Public License for more details.
13 *
14 * You should have received a copy of the GNU Affero General Public License
15 * along with this program. If not, see <https://www.gnu.org/licenses/>.
16 */
17
18use super::{Assign, Fixed, GuardedFixed, NativeFloat64, Number, Rational};
19
20use num_traits::{Num, One, Zero};
21//use wasm_bindgen::prelude::wasm_bindgen;
22
23use std::cmp::{Ord, Ordering};
24use std::fmt;
25use std::mem::ManuallyDrop;
26use std::ops::{self, Deref, DerefMut};
27
28/// Represents the underlying implementation for [DynNum]s
29//#[wasm_bindgen]
30pub enum NumKind {
31 /// See [crate::numbers::fixed]
32 Fixed,
33 /// See [crate::numbers::gfixed]
34 GuardedFixed,
35 /// See [crate::numbers::native]
36 NativeFloat64,
37 /// See [crate::numbers::rational_rug] or [crate::numbers::rational_num]
38 Rational,
39}
40
41/// Determines which underlying implementation to use
42static mut KIND: NumKind = NumKind::Fixed;
43
44/// Returns which underlying implementation is in use
45#[inline]
46fn get_kind() -> &'static NumKind {
47 unsafe {
48 return &KIND;
49 }
50}
51
52/// A wrapper for different numeric types using dynamic dispatch
53pub union DynNum {
54 fixed: ManuallyDrop<Fixed>,
55 gfixed: ManuallyDrop<GuardedFixed>,
56 float64: NativeFloat64,
57 rational: ManuallyDrop<Rational>,
58}
59
60impl DynNum {
61 /// Set which underlying implementation to use
62 pub fn set_kind(kind: NumKind) {
63 unsafe {
64 KIND = kind;
65 }
66 }
67}
68
69macro_rules! impl_1arg_nowrap {
70 ($self:expr, $arg:expr, $func:ident) => {
71 // Safety: Access only correct union field
72 unsafe {
73 match get_kind() {
74 NumKind::Fixed => {
75 $self.fixed.$func($arg)
76 }
77 NumKind::GuardedFixed => {
78 $self.gfixed.$func($arg)
79 }
80 NumKind::NativeFloat64 => {
81 $self.float64.$func($arg)
82 }
83 NumKind::Rational => {
84 $self.rational.$func($arg)
85 }
86 }
87 }
88 }
89}
90
91macro_rules! impl_assoc_nowrap {
92 ($func:ident) => {
93 match get_kind() {
94 NumKind::Fixed => {
95 Fixed::$func()
96 }
97 NumKind::GuardedFixed => {
98 GuardedFixed::$func()
99 }
100 NumKind::NativeFloat64 => {
101 NativeFloat64::$func()
102 }
103 NumKind::Rational => {
104 Rational::$func()
105 }
106 }
107 }
108}
109
110impl Number for DynNum {
111 fn new() -> Self {
112 match get_kind() {
113 NumKind::Fixed => {
114 DynNum { fixed: ManuallyDrop::new(Fixed::new()) }
115 }
116 NumKind::GuardedFixed => {
117 DynNum { gfixed: ManuallyDrop::new(GuardedFixed::new()) }
118 }
119 NumKind::NativeFloat64 => {
120 DynNum { float64: NativeFloat64::new() }
121 }
122 NumKind::Rational => {
123 DynNum { rational: ManuallyDrop::new(Rational::new()) }
124 }
125 }
126 }
127
128 fn describe() -> String { impl_assoc_nowrap!(describe) }
129 fn pow_assign(&mut self, exponent: i32) { impl_1arg_nowrap!(self, exponent, pow_assign) }
130 fn floor_mut(&mut self, dps: usize) { impl_1arg_nowrap!(self, dps, floor_mut) }
131 fn ceil_mut(&mut self, dps: usize) { impl_1arg_nowrap!(self, dps, ceil_mut) }
132 fn round_mut(&mut self, dps: usize) { impl_1arg_nowrap!(self, dps, round_mut) }
133}
134
135impl Drop for DynNum {
136 fn drop(&mut self) {
137 // Safety: Access only correct union field
138 unsafe {
139 match get_kind() {
140 NumKind::Fixed => {
141 ManuallyDrop::drop(&mut self.fixed);
142 }
143 NumKind::GuardedFixed => {
144 ManuallyDrop::drop(&mut self.gfixed);
145 }
146 NumKind::NativeFloat64 => {}
147 NumKind::Rational => {
148 ManuallyDrop::drop(&mut self.rational);
149 }
150 }
151 }
152 }
153}
154
155macro_rules! impl_0arg_wrap {
156 ($self:expr, $func:ident) => {
157 // Safety: Access only correct union field
158 unsafe {
159 match get_kind() {
160 NumKind::Fixed => {
161 DynNum { fixed: ManuallyDrop::new($self.fixed.deref().$func()) }
162 }
163 NumKind::GuardedFixed => {
164 DynNum { gfixed: ManuallyDrop::new($self.gfixed.deref().$func()) }
165 }
166 NumKind::NativeFloat64 => {
167 DynNum { float64: $self.float64.$func() }
168 }
169 NumKind::Rational => {
170 DynNum { rational: ManuallyDrop::new($self.rational.deref().$func()) }
171 }
172 }
173 }
174 }
175}
176
177impl Clone for DynNum {
178 fn clone(&self) -> Self { impl_0arg_wrap!(self, clone) }
179}
180
181impl Num for DynNum {
182 type FromStrRadixErr = Self; // TODO
183
184 fn from_str_radix(str: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr> {
185 match get_kind() {
186 NumKind::Fixed => {
187 Ok(DynNum { fixed: ManuallyDrop::new(Fixed::from_str_radix(str, radix).unwrap()) })
188 }
189 NumKind::GuardedFixed => {
190 Ok(DynNum { gfixed: ManuallyDrop::new(GuardedFixed::from_str_radix(str, radix).unwrap()) })
191 }
192 NumKind::NativeFloat64 => {
193 Ok(DynNum { float64: NativeFloat64::from_str_radix(str, radix).unwrap() })
194 }
195 NumKind::Rational => {
196 Ok(DynNum { rational: ManuallyDrop::new(Rational::from_str_radix(str, radix).unwrap()) })
197 }
198 }
199 }
200}
201
202macro_rules! impl_1other_nowrap {
203 ($self:expr, $rhs:expr, $func:ident) => {
204 // Safety: Access only correct union field
205 unsafe {
206 match get_kind() {
207 NumKind::Fixed => {
208 $self.fixed.deref().$func($rhs.fixed.deref())
209 }
210 NumKind::GuardedFixed => {
211 $self.gfixed.deref().$func($rhs.gfixed.deref())
212 }
213 NumKind::NativeFloat64 => {
214 $self.float64.$func(&$rhs.float64)
215 }
216 NumKind::Rational => {
217 $self.rational.deref().$func($rhs.rational.deref())
218 }
219 }
220 }
221 }
222}
223
224macro_rules! impl_1other_nowrap_mut {
225 ($self:expr, $rhs:expr, $func:ident) => {
226 // Safety: Access only correct union field
227 unsafe {
228 match get_kind() {
229 NumKind::Fixed => {
230 $self.fixed.deref_mut().$func($rhs.fixed.deref())
231 }
232 NumKind::GuardedFixed => {
233 $self.gfixed.deref_mut().$func($rhs.gfixed.deref())
234 }
235 NumKind::NativeFloat64 => {
236 $self.float64.$func(&$rhs.float64)
237 }
238 NumKind::Rational => {
239 $self.rational.deref_mut().$func($rhs.rational.deref())
240 }
241 }
242 }
243 }
244}
245
246impl Assign for DynNum {
247 fn assign(&mut self, src: Self) { impl_1other_nowrap_mut!(self, src, assign) }
248}
249
250impl Assign<&Self> for DynNum {
251 fn assign(&mut self, src: &Self) { impl_1other_nowrap_mut!(self, src, assign) }
252}
253
254impl From<usize> for DynNum {
255 fn from(n: usize) -> Self {
256 match get_kind() {
257 NumKind::Fixed => {
258 DynNum { fixed: ManuallyDrop::new(Fixed::from(n)) }
259 }
260 NumKind::GuardedFixed => {
261 DynNum { gfixed: ManuallyDrop::new(GuardedFixed::from(n)) }
262 }
263 NumKind::NativeFloat64 => {
264 DynNum { float64: NativeFloat64::from(n) }
265 }
266 NumKind::Rational => {
267 DynNum { rational: ManuallyDrop::new(Rational::from(n)) }
268 }
269 }
270 }
271}
272
273impl fmt::Display for DynNum {
274 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { impl_1arg_nowrap!(self, f, fmt) }
275}
276
277impl fmt::Debug for DynNum {
278 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { impl_1arg_nowrap!(self, f, fmt) }
279}
280
281impl PartialEq for DynNum {
282 fn eq(&self, other: &Self) -> bool { impl_1other_nowrap!(self, other, eq) }
283}
284
285impl Eq for DynNum {}
286
287impl PartialOrd for DynNum {
288 fn partial_cmp(&self, other: &Self) -> Option<Ordering> { impl_1other_nowrap!(self, other, partial_cmp) }
289}
290
291impl Ord for DynNum {
292 fn cmp(&self, other: &Self) -> Ordering { impl_1other_nowrap!(self, other, cmp) }
293}
294
295macro_rules! impl_assoc_wrap {
296 ($func:ident) => {
297 match get_kind() {
298 NumKind::Fixed => {
299 DynNum { fixed: ManuallyDrop::new(Fixed::$func()) }
300 }
301 NumKind::GuardedFixed => {
302 DynNum { gfixed: ManuallyDrop::new(GuardedFixed::$func()) }
303 }
304 NumKind::NativeFloat64 => {
305 DynNum { float64: NativeFloat64::$func() }
306 }
307 NumKind::Rational => {
308 DynNum { rational: ManuallyDrop::new(Rational::$func()) }
309 }
310 }
311 }
312}
313
314impl One for DynNum {
315 fn one() -> Self { impl_assoc_wrap!(one) }
316}
317
318macro_rules! impl_0arg_nowrap {
319 ($self:expr, $func:ident) => {
320 // Safety: Access only correct union field
321 unsafe {
322 match get_kind() {
323 NumKind::Fixed => {
324 $self.fixed.deref().$func()
325 }
326 NumKind::GuardedFixed => {
327 $self.gfixed.deref().$func()
328 }
329 NumKind::NativeFloat64 => {
330 $self.float64.$func()
331 }
332 NumKind::Rational => {
333 $self.rational.deref().$func()
334 }
335 }
336 }
337 }
338}
339
340impl Zero for DynNum {
341 fn zero() -> Self { impl_assoc_wrap!(zero) }
342
343 fn is_zero(&self) -> bool { impl_0arg_nowrap!(self, is_zero) }
344}
345
346impl ops::Neg for DynNum {
347 type Output = Self;
348 fn neg(self) -> Self::Output { impl_0arg_wrap!(self, neg) }
349}
350
351macro_rules! impl_1other_wrap {
352 ($self:expr, $rhs:expr, $func:ident) => {
353 // Safety: Access only correct union field
354 unsafe {
355 match get_kind() {
356 NumKind::Fixed => {
357 DynNum { fixed: ManuallyDrop::new($self.fixed.deref().$func($rhs.fixed.deref())) }
358 }
359 NumKind::GuardedFixed => {
360 DynNum { gfixed: ManuallyDrop::new($self.gfixed.deref().$func($rhs.gfixed.deref())) }
361 }
362 NumKind::NativeFloat64 => {
363 DynNum { float64: $self.float64.$func($rhs.float64) }
364 }
365 NumKind::Rational => {
366 DynNum { rational: ManuallyDrop::new($self.rational.deref().$func($rhs.rational.deref())) }
367 }
368 }
369 }
370 }
371}
372
373impl ops::Add for DynNum {
374 type Output = Self;
375 fn add(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, add) }
376}
377
378impl ops::Sub for DynNum {
379 type Output = Self;
380 fn sub(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, sub) }
381}
382
383impl ops::Mul for DynNum {
384 type Output = Self;
385 fn mul(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, mul) }
386}
387
388impl ops::Div for DynNum {
389 type Output = Self;
390 fn div(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, div) }
391}
392
393impl ops::Rem for DynNum {
394 type Output = Self;
395 fn rem(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, rem) }
396}
397
398impl ops::Add<&Self> for DynNum {
399 type Output = Self;
400 fn add(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, add) }
401}
402
403impl ops::Sub<&Self> for DynNum {
404 type Output = Self;
405 fn sub(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, sub) }
406}
407
408impl ops::Mul<&Self> for DynNum {
409 type Output = Self;
410 fn mul(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, mul) }
411}
412
413impl ops::Div<&Self> for DynNum {
414 type Output = Self;
415 fn div(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, div) }
416}
417
418impl ops::Rem<&Self> for DynNum {
419 type Output = Self;
420 fn rem(self, rhs: &Self) -> Self::Output { impl_1other_wrap!(self, rhs, rem) }
421}
422
423impl ops::AddAssign for DynNum {
424 fn add_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, add_assign) }
425}
426
427impl ops::SubAssign for DynNum {
428 fn sub_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, sub_assign) }
429}
430
431impl ops::MulAssign for DynNum {
432 fn mul_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, mul_assign) }
433}
434
435impl ops::DivAssign for DynNum {
436 fn div_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, div_assign) }
437}
438
439impl ops::RemAssign for DynNum {
440 fn rem_assign(&mut self, rhs: Self) { impl_1other_nowrap_mut!(self, rhs, rem_assign) }
441}
442
443impl ops::AddAssign<&Self> for DynNum {
444 fn add_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, add_assign) }
445}
446
447impl ops::SubAssign<&Self> for DynNum {
448 fn sub_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, sub_assign) }
449}
450
451impl ops::MulAssign<&Self> for DynNum {
452 fn mul_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, mul_assign) }
453}
454
455impl ops::DivAssign<&Self> for DynNum {
456 fn div_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, div_assign) }
457}
458
459impl ops::RemAssign<&Self> for DynNum {
460 fn rem_assign(&mut self, rhs: &Self) { impl_1other_nowrap_mut!(self, rhs, rem_assign) }
461}
462
463impl ops::Neg for &DynNum {
464 type Output = DynNum;
465 fn neg(self) -> Self::Output { impl_0arg_wrap!(self, neg) }
466}
467
468impl ops::Add<Self> for &DynNum {
469 type Output = DynNum;
470 fn add(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, add) }
471}
472
473impl ops::Sub<Self> for &DynNum {
474 type Output = DynNum;
475 fn sub(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, sub) }
476}
477
478impl ops::Mul<Self> for &DynNum {
479 type Output = DynNum;
480 fn mul(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, mul) }
481}
482
483impl ops::Div<Self> for &DynNum {
484 type Output = DynNum;
485 fn div(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, div) }
486}
487
488impl ops::Rem<Self> for &DynNum {
489 type Output = DynNum;
490 fn rem(self, rhs: Self) -> Self::Output { impl_1other_wrap!(self, rhs, rem) }
491}
492
493/*
494impl ops::Add<&&Rational> for &Rational {
495
496}
497
498impl ops::Sub<&&Rational> for &Rational {
499
500}
501
502impl ops::Mul<&&Rational> for &Rational {
503
504}
505
506impl ops::Div<&&Rational> for &Rational {
507
508}
509
510impl ops::Rem<&&Rational> for &Rational {
511
512}
513*/
|