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factor::Factors: Use a RefCell rather than copy data when printing

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~2.9% faster than the previous commit, ~11% faster than “master” overall.
This commit is contained in:
nicoo 2020-07-29 20:45:45 +02:00 • committed by Roy Ivy III
parent 30f9cf32f2
commit 8643489096
1 changed files with 6 additions and 5 deletions
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11
src/uu/factor/src/factor.rs
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@ -7,6 +7,7 @@
extern crate rand;
use std::cell::RefCell;
use std::fmt;
use crate::numeric::{Arithmetic, Montgomery};
@ -64,16 +65,16 @@ impl PartialEq for Decomposition {
impl Eq for Decomposition {}
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct Factors(Decomposition);
pub struct Factors(RefCell<Decomposition>);
impl Factors {
pub fn one() -> Factors {
Factors(Decomposition::one())
Factors(RefCell::new(Decomposition::one()))
}
pub fn add(&mut self, prime: u64, exp: Exponent) {
debug_assert!(miller_rabin::is_prime(prime));
self.0.add(prime, exp)
self.0.borrow_mut().add(prime, exp)
}
pub fn push(&mut self, prime: u64) {
@ -82,13 +83,13 @@ impl Factors {
#[cfg(test)]
fn product(&self) -> u64 {
self.0.product()
self.0.borrow().product()
}
}
impl fmt::Display for Factors {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut v = (self.0).0.clone();
let v = &mut (self.0).borrow_mut().0;
v.sort_unstable();
for (p, exp) in v.iter() {