Trait AliasableWeight

pub trait AliasableWeight:
    Sized
    + Copy
    + SampleUniform
    + PartialOrd
    + Add<Output = Self>
    + AddAssign
    + Sub<Output = Self>
    + SubAssign
    + Mul<Output = Self>
    + MulAssign
    + Div<Output = Self>
    + DivAssign
    + Sum {
    const MAX: Self;
    const ZERO: Self;

    // Required method
    fn try_from_u32_lossy(n: u32) -> Option<Self>;

    // Provided method
    fn sum(values: &[Self]) -> Self { ... }
}

Trait that must be implemented for weights, that are used with WeightedAliasIndex. Currently no guarantees on the correctness of WeightedAliasIndex are given for custom implementations of this trait.

Required Associated Constants

const MAX: Self

Maximum number representable by Self.

const ZERO: Self

Element of Self equivalent to 0.

Required Methods

fn try_from_u32_lossy(n: u32) -> Option<Self>

Produce an instance of Self from a u32 value, or return None if out of range. Loss of precision (where Self is a floating point type) is acceptable.

Provided Methods

fn sum(values: &[Self]) -> Self

Sums all values in slice values.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl AliasableWeight for f32

const MAX: Self = 3.40282347E+38f32

const ZERO: Self = 0f32

fn try_from_u32_lossy(n: u32) -> Option<Self>

fn sum(values: &[Self]) -> Self

impl AliasableWeight for f64

const MAX: Self = 1.7976931348623157E+308f64

const ZERO: Self = 0f64

fn try_from_u32_lossy(n: u32) -> Option<Self>

fn sum(values: &[Self]) -> Self

impl AliasableWeight for i8

const MAX: Self = 127i8

const ZERO: Self = 0i8

fn try_from_u32_lossy(n: u32) -> Option<Self>

impl AliasableWeight for i16

const MAX: Self = 32_767i16

const ZERO: Self = 0i16

fn try_from_u32_lossy(n: u32) -> Option<Self>

impl AliasableWeight for i32

const MAX: Self = 2_147_483_647i32

const ZERO: Self = 0i32

fn try_from_u32_lossy(n: u32) -> Option<Self>

impl AliasableWeight for i64

const MAX: Self = 9_223_372_036_854_775_807i64

const ZERO: Self = 0i64

fn try_from_u32_lossy(n: u32) -> Option<Self>

impl AliasableWeight for i128

const MAX: Self = 170_141_183_460_469_231_731_687_303_715_884_105_727i128

const ZERO: Self = 0i128

fn try_from_u32_lossy(n: u32) -> Option<Self>

impl AliasableWeight for isize

const MAX: Self = 9_223_372_036_854_775_807isize

const ZERO: Self = 0isize

fn try_from_u32_lossy(n: u32) -> Option<Self>

impl AliasableWeight for u8

const MAX: Self = 255u8

const ZERO: Self = 0u8

fn try_from_u32_lossy(n: u32) -> Option<Self>

impl AliasableWeight for u16

const MAX: Self = 65_535u16

const ZERO: Self = 0u16

fn try_from_u32_lossy(n: u32) -> Option<Self>

impl AliasableWeight for u32

const MAX: Self = 4_294_967_295u32

const ZERO: Self = 0u32

fn try_from_u32_lossy(n: u32) -> Option<Self>

impl AliasableWeight for u64

const MAX: Self = 18_446_744_073_709_551_615u64

const ZERO: Self = 0u64

fn try_from_u32_lossy(n: u32) -> Option<Self>

impl AliasableWeight for u128

const MAX: Self = 340_282_366_920_938_463_463_374_607_431_768_211_455u128

const ZERO: Self = 0u128

fn try_from_u32_lossy(n: u32) -> Option<Self>

impl AliasableWeight for usize

const MAX: Self = 18_446_744_073_709_551_615usize

const ZERO: Self = 0usize

fn try_from_u32_lossy(n: u32) -> Option<Self>

Implementors