[−][src]Trait num::traits::identities::One

pub trait One: Mul<Self, Output = Self> {
    fn one() -> Self;

    fn set_one(&mut self) { ... }

    fn is_one(&self) -> bool
    where
        Self: PartialEq<Self>,
    { ... }
}

Defines a multiplicative identity element for Self.

Laws

a * 1 = a       ∀ a ∈ Self
1 * a = a       ∀ a ∈ Self

Required methods

fn one() -> Self

Returns the multiplicative identity element of Self, 1.

Purity

This function should return the same result at all times regardless of external mutable state, for example values stored in TLS or in static muts.

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Provided methods

fn set_one(&mut self)

Sets self to the multiplicative identity element of Self, 1.

fn is_one(&self) -> bool where
    Self: PartialEq<Self>, 

Returns true if self is equal to the multiplicative identity.

For performance reasons, it's best to implement this manually. After a semver bump, this method will be required, and the where Self: PartialEq bound will be removed.

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Implementations on Foreign Types

impl One for u8[src]

impl One for u16[src]

impl<T> One for Wrapping<T> where
    T: One,
    Wrapping<T>: Mul<Wrapping<T>>,
    <Wrapping<T> as Mul<Wrapping<T>>>::Output == Wrapping<T>, [src]

impl One for i32[src]

impl One for i8[src]

impl One for f32[src]

impl One for u128[src]

impl One for u32[src]

impl One for usize[src]

impl One for u64[src]

impl One for f64[src]

impl One for i128[src]

impl One for isize[src]

impl One for i64[src]

impl One for i16[src]

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Implementors

impl One for BigInt[src]

impl One for BigUint[src]

impl<T> One for Complex<T> where
    T: Clone + Num, [src]

impl<T> One for Ratio<T> where
    T: Clone + Integer, [src]

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