Trait sp_runtime::traits::One

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

    // Provided methods
    fn set_one(&mut self) { ... }
    fn is_one(&self) -> bool
       where Self: PartialEq { ... }
}
Expand description

Defines a multiplicative identity element for Self.

§Laws

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

Required Methods§

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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.

Provided Methods§

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fn set_one(&mut self)

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

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

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.

Object Safety§

This trait is not object safe.

Implementations on Foreign Types§

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impl One for f32

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fn one() -> f32

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fn is_one(&self) -> bool

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impl One for f64

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fn one() -> f64

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fn is_one(&self) -> bool

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impl One for i8

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fn one() -> i8

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fn is_one(&self) -> bool

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impl One for i16

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fn one() -> i16

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fn is_one(&self) -> bool

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impl One for i32

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fn one() -> i32

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fn is_one(&self) -> bool

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impl One for i64

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fn one() -> i64

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fn is_one(&self) -> bool

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impl One for i128

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fn one() -> i128

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fn is_one(&self) -> bool

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impl One for isize

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fn one() -> isize

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fn is_one(&self) -> bool

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impl One for u8

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fn one() -> u8

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fn is_one(&self) -> bool

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impl One for u16

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fn one() -> u16

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fn is_one(&self) -> bool

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impl One for u32

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fn one() -> u32

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fn is_one(&self) -> bool

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impl One for u64

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fn one() -> u64

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fn is_one(&self) -> bool

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impl One for u128

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fn one() -> u128

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fn is_one(&self) -> bool

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impl One for usize

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fn one() -> usize

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fn is_one(&self) -> bool

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impl One for BigInt

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fn one() -> BigInt

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fn set_one(&mut self)

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fn is_one(&self) -> bool

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impl One for BigUint

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fn one() -> BigUint

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fn set_one(&mut self)

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fn is_one(&self) -> bool

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impl One for U128

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fn one() -> U128

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impl One for U256

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fn one() -> U256

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impl One for U512

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fn one() -> U512

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impl<P> One for CubicExtField<P>
where P: CubicExtConfig,

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fn one() -> CubicExtField<P>

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fn is_one(&self) -> bool

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impl<P> One for QuadExtField<P>
where P: QuadExtConfig,

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fn one() -> QuadExtField<P>

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fn is_one(&self) -> bool

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impl<P, const N: usize> One for Fp<P, N>
where P: FpConfig<N>,

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fn one() -> Fp<P, N>

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fn is_one(&self) -> bool

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

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fn set_one(&mut self)

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fn one() -> Wrapping<T>

Implementors§

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impl One for sp_runtime::biguint::BigUint

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impl One for FixedI64

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impl One for FixedI128

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impl One for FixedU64

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impl One for FixedU128

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impl One for PerU16

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impl One for Perbill

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impl One for Percent

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impl One for Permill

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impl One for Perquintill

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impl<T: One, D: Get<T>> One for TypeWithDefault<T, D>