Trait Weight 

pub trait Weight: Clone {
    const ZERO: Self;

    // Required method
    fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>;
}

Bounds on a weight

See usage in WeightedIndex.

Required Associated Constants

const ZERO: Self

Representation of 0

Required Methods

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

Checked addition

• Result::Ok: On success, v is added to self
• Result::Err: Returns an error when Self cannot represent the result of self + v (i.e. overflow). The value of self should be discarded.

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 Weight for f32

const ZERO: Self = 0.0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for f64

const ZERO: Self = 0.0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for i8

const ZERO: Self = 0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for i16

const ZERO: Self = 0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for i32

const ZERO: Self = 0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for i64

const ZERO: Self = 0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for i128

const ZERO: Self = 0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for isize

const ZERO: Self = 0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for u8

const ZERO: Self = 0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for u16

const ZERO: Self = 0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for u32

const ZERO: Self = 0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for u64

const ZERO: Self = 0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for u128

const ZERO: Self = 0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

impl Weight for usize

const ZERO: Self = 0

fn checked_add_assign(&mut self, v: &Self) -> Result<(), ()>

Implementors