Trait StringIndex 

pub trait StringIndex:
    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 by crate::StringId.

Self::try_from_usize is used at build and validation boundaries where counts are computed as usize. Self::to_usize is used on lookup paths for infallible indexing.

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_string_index macro:

use lite_strtab::impl_string_index;

#[derive(Clone, Copy)]
#[repr(transparent)]
struct ProviderIdx(u16);

impl_string_index!(ProviderIdx: u16);

Required Associated Constants

const TYPE_NAME: &'static str

Human-readable type name.

Required Methods

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

Converts a string index into this type.

fn to_usize(self) -> usize

Converts this index 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 StringIndex for u8

const TYPE_NAME: &'static str = "u8"

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

fn to_usize(self) -> usize

impl StringIndex for u16

const TYPE_NAME: &'static str = "u16"

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

fn to_usize(self) -> usize

impl StringIndex for u32

const TYPE_NAME: &'static str = "u32"

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

fn to_usize(self) -> usize

impl StringIndex for u64

const TYPE_NAME: &'static str = "u64"

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

fn to_usize(self) -> usize

impl StringIndex for usize

const TYPE_NAME: &'static str = "usize"

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

fn to_usize(self) -> usize

Implementors