[−][src]Trait rug::ops::SubFromRound

pub trait SubFromRound<Lhs = Self> {
type Round;
type Ordering;
    fn sub_from_round(&mut self, lhs: Lhs, round: Self::Round) -> Self::Ordering;
}

Compound subtraction and assignment to the rhs operand with a specified rounding method.

Examples

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

Associated Types

`type Round`

The rounding method.

`type Ordering`

The direction from rounding.

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Required methods

`fn sub_from_round(&mut self, lhs: Lhs, round: Self::Round) -> Self::Ordering`

Performs the subtraction.

Examples

use rug::Float;
use rug::float::Round;
use rug::ops::SubFromRound;
use std::cmp::Ordering;
// only four significant bits
let mut f = Float::with_val(4, 0.3);
let dir = f.sub_from_round(-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 SubFromRound<f32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

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

`impl SubFromRound<f32> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

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

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

`type Round = Round`

`type Ordering = Ordering`

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

`impl SubFromRound<f64> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

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

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

`type Round = Round`

`type Ordering = Ordering`

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

`impl SubFromRound<i32> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

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

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

`type Round = Round`

`type Ordering = Ordering`

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

`impl SubFromRound<u32> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

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

`impl SubFromRound<Complex> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

`fn sub_from_round( &mut self, lhs: Complex, round: (Round, Round) ) -> (Ordering, Ordering)`[src]

`impl SubFromRound<Float> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

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

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

`type Round = Round`

`type Ordering = Ordering`

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

`impl SubFromRound<Integer> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

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

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

`type Round = Round`

`type Ordering = Ordering`

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

`impl SubFromRound<Rational> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

`fn sub_from_round( &mut self, lhs: Rational, round: (Round, Round) ) -> (Ordering, Ordering)`[src]

`impl SubFromRound<Rational> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: Rational, round: Round) -> Ordering`[src]

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

`type Round = Round`

`type Ordering = Ordering`

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

`impl<'_> SubFromRound<&'_ f32> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

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

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

`type Round = Round`

`type Ordering = Ordering`

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

`impl<'_> SubFromRound<&'_ f64> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

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

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

`type Round = Round`

`type Ordering = Ordering`

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

`impl<'_> SubFromRound<&'_ i32> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

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

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

`type Round = Round`

`type Ordering = Ordering`

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

`impl<'_> SubFromRound<&'_ u32> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

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

`impl<'_> SubFromRound<&'_ Complex> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

`fn sub_from_round( &mut self, lhs: &Complex, round: (Round, Round) ) -> (Ordering, Ordering)`[src]

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

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

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

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

`type Round = Round`

`type Ordering = Ordering`

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

`impl<'_> SubFromRound<&'_ Integer> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

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

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

`type Round = Round`

`type Ordering = Ordering`

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

`impl<'_> SubFromRound<&'_ Rational> for Complex`[src]

`type Round = (Round, Round)`

`type Ordering = (Ordering, Ordering)`

`fn sub_from_round( &mut self, lhs: &Rational, round: (Round, Round) ) -> (Ordering, Ordering)`[src]

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

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &Rational, round: Round) -> Ordering`[src]

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