| // Copyright 2012 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| trait methods { |
| fn to_bytes(&self) -> Vec<u8> ; |
| } |
| |
| impl methods for () { |
| fn to_bytes(&self) -> Vec<u8> { |
| Vec::new() |
| } |
| } |
| |
| // the position of this function is significant! - if it comes before methods |
| // then it works, if it comes after it then it doesn't! |
| fn to_bools(bitv: Storage) -> Vec<bool> { |
| (0..8).map(|i| { |
| let w = i / 64; |
| let b = i % 64; |
| let x = 1 & (bitv.storage[w] >> b); |
| x == 1 |
| }).collect() |
| } |
| |
| struct Storage { storage: Vec<u64> } |
| |
| pub fn main() { |
| let bools = vec![false, false, true, false, false, true, true, false]; |
| let bools2 = to_bools(Storage{storage: vec![0b01100100]}); |
| |
| for i in 0..8 { |
| println!("{} => {} vs {}", i, bools[i], bools2[i]); |
| } |
| |
| assert_eq!(bools, bools2); |
| } |