Trait CacheKey 

pub trait CacheKey:
    Hash
    + Eq
    + Clone
    + Send
    + Sync
    + 'static {
    const BITS_COUNT: u32;
    const ZERO: Self;
    const ONE: Self;

    // Required methods
    fn from_usize(v: usize) -> Self;
    fn checked_mul(self, rhs: Self) -> Option<Self>;
    fn wrapping_add(self, rhs: Self) -> Self;
}

Trait for cache key types used in flat-index computation.

Built-in implementations are provided for u64, u128, U256, U512, and U1024. For index spaces larger than 1024 bits, implement this trait for a wider integer type and use CachedFunction::with_key_type.

See module documentation for a complete custom key example.

Required Associated Constants

const BITS_COUNT: u32

Number of bits this key type can represent.

const ZERO: Self

The zero value.

const ONE: Self

The one value.

Required Methods

fn from_usize(v: usize) -> Self

Convert a usize to this key type.

fn checked_mul(self, rhs: Self) -> Option<Self>

Checked multiplication. Returns None on overflow.

fn wrapping_add(self, rhs: Self) -> Self

Wrapping addition (overflow wraps around).

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl CacheKey for U256

const BITS_COUNT: u32 = 256

const ZERO: Self = U256::ZERO

const ONE: Self = U256::ONE

fn from_usize(v: usize) -> Self

fn checked_mul(self, rhs: Self) -> Option<Self>

fn wrapping_add(self, rhs: Self) -> Self

impl CacheKey for U512

const BITS_COUNT: u32 = 512

const ZERO: Self = U512::ZERO

const ONE: Self = U512::ONE

fn from_usize(v: usize) -> Self

fn checked_mul(self, rhs: Self) -> Option<Self>

fn wrapping_add(self, rhs: Self) -> Self

impl CacheKey for U1024

const BITS_COUNT: u32 = 1024

const ZERO: Self = U1024::ZERO

const ONE: Self = U1024::ONE

fn from_usize(v: usize) -> Self

fn checked_mul(self, rhs: Self) -> Option<Self>

fn wrapping_add(self, rhs: Self) -> Self

impl CacheKey for u64

const BITS_COUNT: u32 = 64

const ZERO: Self = 0

const ONE: Self = 1

fn from_usize(v: usize) -> Self

fn checked_mul(self, rhs: Self) -> Option<Self>

fn wrapping_add(self, rhs: Self) -> Self

impl CacheKey for u128

const BITS_COUNT: u32 = 128

const ZERO: Self = 0

const ONE: Self = 1

fn from_usize(v: usize) -> Self

fn checked_mul(self, rhs: Self) -> Option<Self>

fn wrapping_add(self, rhs: Self) -> Self

Implementors