Trait rug::ops::PowAssignRound [−] [src]

pub trait PowAssignRound<Rhs = Self> {
    type Round;
    type Ordering;
    fn pow_assign_round(
        &mut self, 
        rhs: Rhs, 
        round: Self::Round
    ) -> Self::Ordering;
}

Compound power operation and assignment with a specified rounding method.

Examples

use rug::Float;
use rug::float::Round;
use rug::ops::PowAssignRound;
use std::cmp::Ordering;
struct F(f64);
impl PowAssignRound<f64> for F {
    type Round = Round;
    type Ordering = Ordering;
    fn pow_assign_round(&mut self, rhs: f64, round: Round) -> Ordering {
        let mut f = Float::with_val(53, self.0);
        let dir = f.pow_assign_round(rhs, round);
        self.0 = f.to_f64();
        dir
    }
}
let mut f = F(3.0);
let dir = f.pow_assign_round(5.0, Round::Nearest);
// 3.0 ^ 5.0 = 243.0
assert_eq!(f.0, 243.0);
assert_eq!(dir, Ordering::Equal);

Associated Types

The rounding method.

The direction from rounding.

Required Methods

Performs the power operation.

Examples

use rug::Float;
use rug::float::Round;
use rug::ops::PowAssignRound;
use std::cmp::Ordering;
// only four significant bits
let mut f = Float::with_val(4, -3);
let dir = f.pow_assign_round(5, Round::Nearest);
// -243 rounded up to -240
assert_eq!(f, -240);
assert_eq!(dir, Ordering::Greater);

Implementors