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