Trait rug::ops::DivFromRound
source · pub trait DivFromRound<Lhs = Self> {
type Round;
type Ordering;
// Required method
fn div_from_round(&mut self, lhs: Lhs, round: Self::Round) -> Self::Ordering;
}Expand description
Compound division and assignment to the rhs operand with a specified rounding method.
§Examples
use core::cmp::Ordering;
use rug::float::Round;
use rug::ops::{DivAssignRound, DivFromRound};
use rug::Float;
struct F(f64);
impl DivFromRound<f64> for F {
type Round = Round;
type Ordering = Ordering;
fn div_from_round(&mut self, lhs: f64, round: Round) -> Ordering {
let mut f = Float::with_val(53, lhs);
let dir = f.div_assign_round(self.0, round);
self.0 = f.to_f64();
dir
}
}
let mut f = F(4.0);
let dir = f.div_from_round(3.0, Round::Nearest);
// 3.0 / 4.0 = 0.75
assert_eq!(f.0, 0.75);
assert_eq!(dir, Ordering::Equal);Required Associated Types§
Required Methods§
sourcefn div_from_round(&mut self, lhs: Lhs, round: Self::Round) -> Self::Ordering
fn div_from_round(&mut self, lhs: Lhs, round: Self::Round) -> Self::Ordering
Performs the division.
§Examples
use core::cmp::Ordering;
use rug::float::Round;
use rug::ops::DivFromRound;
use rug::Float;
// only four significant bits
let mut f = Float::with_val(4, 5);
let dir = f.div_from_round(-3, Round::Nearest);
// -0.6 rounded down to -0.625
assert_eq!(f, -0.625);
assert_eq!(dir, Ordering::Less);