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

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

Compound subtraction and assignment with a specified rounding method.

Associated Types

The rounding method.

The direction from rounding.

Required Methods

Performs the subtraction.

Examples

use rug::Float;
use rug::float::Round;
use rug::ops::SubAssignRound;
use std::cmp::Ordering;
// only four significant bits
let mut f = Float::with_val(4, -3);
let dir = f.sub_assign_round(0.3, Round::Nearest);
// -3.3 rounded up to -3.25
assert_eq!(f, -3.25);
assert_eq!(dir, Ordering::Greater);

Implementors