Trait num_traits::identities::One[−][src]

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

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

Defines a multiplicative identity element for Self.

Required Methods

Returns the multiplicative identity element of Self, 1.

Laws

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

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.

Provided Methods

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.

Implementations on Foreign Types

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

Implementors