Trait ToStableHashKey 

pub trait ToStableHashKey {
    type KeyType: Ord + Sized + HashStable;

    // Required method
    fn to_stable_hash_key<Hcx: HashStableContext>(
        &self,
        hcx: &mut Hcx,
    ) -> Self::KeyType;
}

Implement this for types that can be turned into stable keys like, for example, for DefId that can be converted to a DefPathHash. This is used for bringing maps into a predictable order before hashing them.

Required Associated Types

type KeyType: Ord + Sized + HashStable

Required Methods

fn to_stable_hash_key<Hcx: HashStableContext>( &self, hcx: &mut Hcx, ) -> Self::KeyType

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 ToStableHashKey for String

type KeyType = String

fn to_stable_hash_key<Hcx>(&self, _: &mut Hcx) -> Self::KeyType

impl<T1: ToStableHashKey, T2: ToStableHashKey> ToStableHashKey for (T1, T2)

type KeyType = (<T1 as ToStableHashKey>::KeyType, <T2 as ToStableHashKey>::KeyType)

fn to_stable_hash_key<Hcx: HashStableContext>( &self, hcx: &mut Hcx, ) -> Self::KeyType

Implementors