Trait Key 

pub trait Key: Copy + Eq {
    // Required methods
    fn try_from_usize(index: usize) -> Option<Self>;
    fn into_usize(self) -> usize;
}

Types implementing this trait can be used as keys in the Interner.

Required Methods

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

Try to create a key from the provided usize. The first usize passed to this method will be 0; the second 1; and so on.

This method is more or less the same as the well-known TryFrom<usize> trait. We use a custom trait so that consumers don’t have to implement the well-known trait.

fn into_usize(self) -> usize

Convert the key into a usize.

This method is more or less the same as the well-known Into<usize> trait. We use a custom trait so that consumers don’t have to implement the well-known trait.

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 Key for NonZeroU32

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

fn into_usize(self) -> usize

Implementors