Trait num::Signed

pub trait Signed: Num + Neg<Output=Self> {
    fn abs(&self) -> Self;
    fn abs_sub(&self, other: &Self) -> Self;
    fn signum(&self) -> Self;
    fn is_positive(&self) -> bool;
    fn is_negative(&self) -> bool;
}

[−] Expand description

Useful functions for signed numbers (i.e. numbers that can be negative).

Required Methods

fn abs(&self) -> Self[−]

Computes the absolute value.

For f32 and f64, NaN will be returned if the number is NaN.

For signed integers, ::MIN will be returned if the number is ::MIN.

fn abs_sub(&self, other: &Self) -> Self[−]

The positive difference of two numbers.

Returns zero if the number is less than or equal to other, otherwise the difference between self and other is returned.

fn signum(&self) -> Self[−]

Returns the sign of the number.

For f32 and f64:

• 1.0 if the number is positive, +0.0 or INFINITY
• -1.0 if the number is negative, -0.0 or NEG_INFINITY
• NaN if the number is NaN

For signed integers:

• 0 if the number is zero
• 1 if the number is positive
• -1 if the number is negative

fn is_positive(&self) -> bool[−]

Returns true if the number is positive and false if the number is zero or negative.

fn is_negative(&self) -> bool[−]

Returns true if the number is negative and false if the number is zero or positive.

Implementors

• impl Signed for BigInt
• impl<T> Signed for Ratio<T> where T: Clone + Integer + Signed
• impl Signed for isize
• impl Signed for i8
• impl Signed for i16
• impl Signed for i32
• impl Signed for i64
• impl Signed for f32
• impl Signed for f64
• impl Signed for BigInt
• impl<T: Clone + Integer + Signed> Signed for Ratio<T>