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;
}

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.

Implementations on Foreign Types

impl<T> Signed for Ratio<T> where
    T: Clone + Integer + Signed, 

fn abs(&self) -> Ratio<T>

fn abs_sub(&self, other: &Ratio<T>) -> Ratio<T>

fn signum(&self) -> Ratio<T>

fn is_positive(&self) -> bool

fn is_negative(&self) -> bool

impl Signed for i8

fn abs(&self) -> i8

fn abs_sub(&self, other: &i8) -> i8

fn signum(&self) -> i8

fn is_positive(&self) -> bool

fn is_negative(&self) -> bool

impl Signed for i64

fn abs(&self) -> i64

fn abs_sub(&self, other: &i64) -> i64

fn signum(&self) -> i64

fn is_positive(&self) -> bool

fn is_negative(&self) -> bool

impl Signed for i16

fn abs(&self) -> i16

fn abs_sub(&self, other: &i16) -> i16

fn signum(&self) -> i16

fn is_positive(&self) -> bool

fn is_negative(&self) -> bool

impl Signed for f64

fn abs(&self) -> f64

Computes the absolute value. Returns NAN if the number is NAN.

fn abs_sub(&self, other: &f64) -> f64

The positive difference of two numbers. Returns 0.0 if the number is less than or equal to other, otherwise the difference betweenself and other is returned.

fn signum(&self) -> f64

Returns

• 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

fn is_positive(&self) -> bool

Returns true if the number is positive, including +0.0 and INFINITY

fn is_negative(&self) -> bool

Returns true if the number is negative, including -0.0 and NEG_INFINITY

impl<T> Signed for Wrapping<T> where
    T: Signed,
    Wrapping<T>: Num,
    Wrapping<T>: Neg,
    <Wrapping<T> as Neg>::Output == Wrapping<T>, 

fn abs(&self) -> Wrapping<T>

fn abs_sub(&self, other: &Wrapping<T>) -> Wrapping<T>

fn signum(&self) -> Wrapping<T>

fn is_positive(&self) -> bool

fn is_negative(&self) -> bool

impl Signed for f32

fn abs(&self) -> f32

Computes the absolute value. Returns NAN if the number is NAN.

fn abs_sub(&self, other: &f32) -> f32

The positive difference of two numbers. Returns 0.0 if the number is less than or equal to other, otherwise the difference betweenself and other is returned.

fn signum(&self) -> f32

Returns

• 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

fn is_positive(&self) -> bool

Returns true if the number is positive, including +0.0 and INFINITY

fn is_negative(&self) -> bool

Returns true if the number is negative, including -0.0 and NEG_INFINITY

impl Signed for isize

fn abs(&self) -> isize

fn abs_sub(&self, other: &isize) -> isize

fn signum(&self) -> isize

fn is_positive(&self) -> bool

fn is_negative(&self) -> bool

impl Signed for i32

fn abs(&self) -> i32

fn abs_sub(&self, other: &i32) -> i32

fn signum(&self) -> i32

fn is_positive(&self) -> bool

fn is_negative(&self) -> bool

Implementors

• impl Signed for BigInt