Trait rug::ops::SubFromRound
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[src]
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; use rug::float::Round; use rug::ops::{SubAssignRound, SubFromRound}; 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
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);
Implementors
impl<'a> SubFromRound<Float> for Float type Round = Round; type Ordering = Ordering;
impl<'a> SubFromRound<&'a Float> for Float type Round = Round; type Ordering = Ordering;
impl SubFromRound<Integer> for Float type Round = Round; type Ordering = Ordering;
impl<'a> SubFromRound<&'a Integer> for Float type Round = Round; type Ordering = Ordering;
impl SubFromRound<Rational> for Float type Round = Round; type Ordering = Ordering;
impl<'a> SubFromRound<&'a Rational> for Float type Round = Round; type Ordering = Ordering;
impl SubFromRound<i32> for Float type Round = Round; type Ordering = Ordering;
impl<'t> SubFromRound<&'t i32> for Float type Round = Round; type Ordering = Ordering;
impl SubFromRound<u32> for Float type Round = Round; type Ordering = Ordering;
impl<'t> SubFromRound<&'t u32> for Float type Round = Round; type Ordering = Ordering;
impl SubFromRound<f32> for Float type Round = Round; type Ordering = Ordering;
impl<'t> SubFromRound<&'t f32> for Float type Round = Round; type Ordering = Ordering;
impl SubFromRound<f64> for Float type Round = Round; type Ordering = Ordering;
impl<'t> SubFromRound<&'t f64> for Float type Round = Round; type Ordering = Ordering;
impl<'a> SubFromRound<Complex> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl<'a> SubFromRound<&'a Complex> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl SubFromRound<Float> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl<'a> SubFromRound<&'a Float> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl SubFromRound<u32> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl<'t> SubFromRound<&'t u32> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl SubFromRound<i32> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl<'t> SubFromRound<&'t i32> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl SubFromRound<f32> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl<'t> SubFromRound<&'t f32> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl SubFromRound<f64> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl<'t> SubFromRound<&'t f64> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl SubFromRound<Integer> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl<'a> SubFromRound<&'a Integer> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl SubFromRound<Rational> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);
impl<'a> SubFromRound<&'a Rational> for Complex type Round = (Round, Round); type Ordering = (Ordering, Ordering);