Trait num::Signed
[−]
[src]
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
orINFINITY
-1.0
if the number is negative,-0.0
orNEG_INFINITY
NaN
if the number isNaN
For signed integers:
0
if the number is zero1
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>