Trait num_traits::sign::Signed

[+] Show declaration

pub trait Signed: Sized + 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;
}

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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 Signed for isize

[−] Expand description

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 i8

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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 i16

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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 i32

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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

impl Signed for i64

[−] Expand description

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 i128

[−] Expand description

fn abs(&self) -> i128

fn abs_sub(&self, other: &i128) -> i128

fn signum(&self) -> i128

fn is_positive(&self) -> bool

fn is_negative(&self) -> bool

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

[−] Expand description

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

impl Signed for f32

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fn abs(&self) -> f32

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

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

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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

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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

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

fn is_negative(&self) -> bool

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

impl Signed for f64

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fn abs(&self) -> f64

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

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

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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

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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

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

fn is_negative(&self) -> bool

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

Implementors