Derive Macro ByteHash

#[derive(ByteHash)]
{
    // Attributes available to this derive:
    #[zerocopy]
}

Derives an optimized Hash implementation.

This derive can be applied to structs and enums implementing both Immutable and IntoBytes; e.g.:

#[derive(ByteHash, Immutable, IntoBytes)]
#[repr(C)]
struct MyStruct {
    ...
}

#[derive(ByteHash, Immutable, IntoBytes)]
#[repr(u8)]
enum MyEnum {
    ...
}

The standard library’s derive(Hash) produces hashes by individually hashing each field and combining the results. Instead, the implementations of Hash::hash() and Hash::hash_slice() generated by derive(ByteHash) convert the entirey of self to a byte slice and hashes it in a single call to Hasher::write(). This may have performance advantages.