Trait rand::distributions::weighted::alias_method::Weight

pub trait Weight: 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 WeightedIndex. Currently no guarantees on the correctness of WeightedIndex 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.

Implementations on Foreign Types

impl Weight for u32

const MAX: Self = 4_294_967_295u32

const ZERO: Self = 0u32

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

impl Weight 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 Weight for i8

const MAX: Self = 127i8

const ZERO: Self = 0i8

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

impl Weight for u8

const MAX: Self = 255u8

const ZERO: Self = 0u8

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

impl Weight 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 Weight 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 Weight 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 Weight for i32

const MAX: Self = 2_147_483_647i32

const ZERO: Self = 0i32

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

impl Weight 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>

impl Weight 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 Weight 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 Weight for u16

const MAX: Self = 65_535u16

const ZERO: Self = 0u16

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

impl Weight for i16

const MAX: Self = 32_767i16

const ZERO: Self = 0i16

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

impl Weight 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>

Implementors