Trait Offset 

pub trait Offset:
    Copy
    + Send
    + Sync
    + 'static {
    const TYPE_NAME: &'static str;

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

Contract for integer types used as byte offsets.

Unlike crate::StringIndex (which bounds string count), Offset bounds total UTF-8 byte size. Builders and validators use Self::try_from_usize for checked growth, while lookup code uses Self::to_usize for infallible slicing.

Implementing this trait

This trait is already implemented for primitive unsigned integers (u8, u16, u32, u64, usize). To implement it for custom wrapper types, use the impl_offset macro:

use lite_strtab::impl_offset;

#[derive(Clone, Copy)]
#[repr(transparent)]
struct ByteOffset(u32);

impl_offset!(ByteOffset: u32);

Required Associated Constants

const TYPE_NAME: &'static str

Human-readable type name.

Required Methods

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

Converts a byte length/offset into this type.

fn to_usize(self) -> usize

Converts this offset to usize.

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 Offset for u8

const TYPE_NAME: &'static str = "u8"

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

fn to_usize(self) -> usize

impl Offset for u16

const TYPE_NAME: &'static str = "u16"

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

fn to_usize(self) -> usize

impl Offset for u32

const TYPE_NAME: &'static str = "u32"

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

fn to_usize(self) -> usize

impl Offset for u64

const TYPE_NAME: &'static str = "u64"

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

fn to_usize(self) -> usize

impl Offset for usize

const TYPE_NAME: &'static str = "usize"

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

fn to_usize(self) -> usize

Implementors