use std::any::TypeId;
use std::borrow::Borrow;
use std::collections::hash_map::{self, HashMap};
+use std::convert::TryInto;
use std::hash::Hash;
use std::hash::{Hasher, BuildHasherDefault};
#[cfg(test)]
impl Hasher for TypeIdHasher {
#[inline]
fn write(&mut self, bytes: &[u8]) {
- // This expects to receive one and exactly one 64-bit value
- assert!(bytes.len() == 8);
- self.value = u64::from(bytes[0]) | u64::from(bytes[1]) << 8 |
- u64::from(bytes[2]) << 16 | u64::from(bytes[3]) << 24 |
- u64::from(bytes[4]) << 32 | u64::from(bytes[5]) << 40 |
- u64::from(bytes[6]) << 48 | u64::from(bytes[7]) << 56;
+ // This expects to receive exactly one 64-bit value, and there’s no realistic chance of
+ // that changing, but I don’t want to depend on something that isn’t expressly part of the
+ // contract for safety. But I’m OK with release builds putting everything in one bucket
+ // if it *did* change (and debug builds panicking).
+ debug_assert_eq!(bytes.len(), 8);
+ let _ = bytes.try_into()
+ .map(|array| self.value = u64::from_ne_bytes(array));
}
#[inline]
/// contents of an `Map`. However, because you will then be dealing with `Any` trait objects, it
/// doesn’t tend to be so very useful. Still, if you need it, it’s here.
#[derive(Debug)]
-pub struct RawMap<A: ?Sized + UncheckedAnyExt = Any> {
+pub struct RawMap<A: ?Sized + UncheckedAnyExt = dyn Any> {
inner: HashMap<TypeId, Box<A>, BuildHasherDefault<TypeIdHasher>>,
}