| //@ 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>> |
| where |
| CellIdx: Ret, |
| { |
| _idx: CellIdx::R, |
| } |
| |
| fn main() { |
| use std::mem::size_of; |
| println!("{}", size_of::<RobinHashTable<1024>>()); |
| println!("{}", size_of::<RobinHashTable<65536>>()); |
| } |
