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.

Examples

use core::cmp::Ordering;
use rug::{float::Round, ops::SubAssignRound, Float};
struct F(f64);
impl SubAssignRound<f64> for F {
    type Round = Round;
    type Ordering = Ordering;
    fn sub_assign_round(&mut self, rhs: f64, round: Round) -> Ordering {
        let mut f = Float::with_val(53, self.0);
        let dir = f.sub_assign_round(rhs, round);
        self.0 = f.to_f64();
        dir
    }
}
let mut f = F(3.0);
let dir = f.sub_assign_round(5.0, Round::Nearest);
// 3.0 - 5.0 = -2.0
assert_eq!(f.0, -2.0);
assert_eq!(dir, Ordering::Equal);

Associated Types

`type Round`[src]

The rounding method.

`type Ordering`[src]

The direction from rounding.

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Required methods

`fn sub_assign_round(&mut self, rhs: Rhs, round: Self::Round) -> Self::Ordering`[src]

Performs the subtraction.

Examples

use core::cmp::Ordering;
use rug::{float::Round, ops::SubAssignRound, Float};
// 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);

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Implementors

`impl SubAssignRound<&'_ f32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &f32, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ f64> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &f64, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ i8> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &i8, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ i16> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &i16, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ i32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &i32, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ i64> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &i64, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ i128> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &i128, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ u8> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &u8, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ u16> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &u16, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ u32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &u32, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ u64> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &u64, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ u128> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &u128, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ Float> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &Float, round: Round) -> Ordering`[src]

`impl SubAssignRound<&'_ Integer> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: &Integer, round: Round) -> Ordering`[src]

`impl SubAssignRound<f32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: f32, round: Round) -> Ordering`[src]

`impl SubAssignRound<f64> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: f64, round: Round) -> Ordering`[src]

`impl SubAssignRound<i8> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: i8, round: Round) -> Ordering`[src]

`impl SubAssignRound<i16> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: i16, round: Round) -> Ordering`[src]

`impl SubAssignRound<i32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: i32, round: Round) -> Ordering`[src]

`impl SubAssignRound<i64> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: i64, round: Round) -> Ordering`[src]

`impl SubAssignRound<i128> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: i128, round: Round) -> Ordering`[src]

`impl SubAssignRound<u8> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: u8, round: Round) -> Ordering`[src]

`impl SubAssignRound<u16> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: u16, round: Round) -> Ordering`[src]

`impl SubAssignRound<u32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: u32, round: Round) -> Ordering`[src]

`impl SubAssignRound<u64> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: u64, round: Round) -> Ordering`[src]

`impl SubAssignRound<u128> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: u128, round: Round) -> Ordering`[src]

`impl SubAssignRound<Float> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: Float, round: Round) -> Ordering`[src]

`impl SubAssignRound<Integer> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_assign_round(&mut self, rhs: Integer, round: Round) -> Ordering`[src]

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