Trait LayoutIndex 

pub trait LayoutIndex:
    LayoutIndex
    + Copy
    + Eq
    + Ord
    + Debug
    + Display
    + Hash
    + Sized {
    const ZERO: Self;

    // Required methods
    fn to_usize(self) -> Option<usize>;
    fn from_usize(value: usize) -> Option<Self>;
}

Unsigned dense ID width usable by graph and hypergraph layouts and builders.

This is the single index-width contract for the whole substrate: it merges what oxgraph-csr and oxgraph-hyper-bcsr previously duplicated as CsrIndex/BcsrIndex. usize is included for native build-time indices; persisted widths additionally implement SnapshotWidth.

Performance

Implementations perform checked conversions in O(1).

Required Associated Constants

const ZERO: Self

The additive identity for this width (the zero offset / first slot).

Required Methods

fn to_usize(self) -> Option<usize>

Converts this ID to usize when representable on the current target.

Performance

This function is O(1).

fn from_usize(value: usize) -> Option<Self>

Converts a usize into this ID width when representable.

Performance

This function is O(1).

Dyn Compatibility

This trait is not dyn compatible.

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

Implementations on Foreign Types

impl LayoutIndex for u16

const ZERO: Self = 0

fn to_usize(self) -> Option<usize>

fn from_usize(value: usize) -> Option<Self>

impl LayoutIndex for u32

const ZERO: Self = 0

fn to_usize(self) -> Option<usize>

fn from_usize(value: usize) -> Option<Self>

impl LayoutIndex for u64

const ZERO: Self = 0

fn to_usize(self) -> Option<usize>

fn from_usize(value: usize) -> Option<Self>

impl LayoutIndex for usize

const ZERO: Self = 0

fn to_usize(self) -> Option<usize>

fn from_usize(value: usize) -> Option<Self>

Implementors