mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-30 18:53:39 +00:00
32 lines
623 B
Rust
32 lines
623 B
Rust
//@ known-bug: #105238
|
|
|
|
#![allow(incomplete_features)]
|
|
#![feature(generic_const_exprs)]
|
|
|
|
trait Ret {
|
|
type R;
|
|
}
|
|
|
|
struct Cond<const PRED: bool, U, V>(std::marker::PhantomData<U>, std::marker::PhantomData<V>);
|
|
|
|
impl<U, V> Ret for Cond<true, U, V> {
|
|
type R = U;
|
|
}
|
|
|
|
impl<U, V> Ret for Cond<false, U, V> {
|
|
type R = V;
|
|
}
|
|
|
|
struct RobinHashTable<
|
|
const MAX_LENGTH: usize,
|
|
CellIdx = <Cond<{ MAX_LENGTH < 65535 }, u16, u32> as Ret>::R,
|
|
> {
|
|
_idx: CellIdx,
|
|
}
|
|
|
|
fn main() {
|
|
use std::mem::size_of;
|
|
println!("{}", size_of::<RobinHashTable<1024>>());
|
|
println!("{}", size_of::<RobinHashTable<65536>>());
|
|
}
|