Trait num::Signed

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pub trait Signed: Sized + Num + Neg<Output = Self> {
    // Required methods
    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§

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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.

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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.

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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
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fn is_positive(&self) -> bool

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

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fn is_negative(&self) -> bool

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

Object Safety§

This trait is not object safe.

Implementations on Foreign Types§

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impl Signed for f32

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fn abs(&self) -> f32

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

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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.

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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
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fn is_positive(&self) -> bool

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

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fn is_negative(&self) -> bool

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

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impl Signed for f64

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fn abs(&self) -> f64

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

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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.

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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
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fn is_positive(&self) -> bool

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

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fn is_negative(&self) -> bool

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

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impl Signed for i8

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fn abs(&self) -> i8

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

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fn signum(&self) -> i8

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fn is_positive(&self) -> bool

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fn is_negative(&self) -> bool

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impl Signed for i16

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fn abs(&self) -> i16

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

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fn signum(&self) -> i16

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fn is_positive(&self) -> bool

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fn is_negative(&self) -> bool

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impl Signed for i32

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fn abs(&self) -> i32

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

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fn signum(&self) -> i32

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fn is_positive(&self) -> bool

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fn is_negative(&self) -> bool

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impl Signed for i64

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fn abs(&self) -> i64

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

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fn signum(&self) -> i64

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fn is_positive(&self) -> bool

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fn is_negative(&self) -> bool

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impl Signed for i128

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fn abs(&self) -> i128

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

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fn signum(&self) -> i128

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fn is_positive(&self) -> bool

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fn is_negative(&self) -> bool

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impl Signed for isize

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fn abs(&self) -> isize

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

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fn signum(&self) -> isize

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fn is_positive(&self) -> bool

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fn is_negative(&self) -> bool

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

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

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

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

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fn is_positive(&self) -> bool

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fn is_negative(&self) -> bool

Implementors§

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impl Signed for BigInt

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