| // Copyright 2014 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. |
| |
| use std::slice; |
| |
| /// Allows to view uniform tuples as slices |
| pub trait TupleSlice<T> { |
| fn as_slice(&self) -> &[T]; |
| fn as_mut_slice(&mut self) -> &mut [T]; |
| } |
| |
| macro_rules! impl_tuple_slice { |
| ($tuple_type:ty, $size:expr) => { |
| impl<T> TupleSlice<T> for $tuple_type { |
| fn as_slice(&self) -> &[T] { |
| unsafe { |
| let ptr = &self.0 as *const T; |
| slice::from_raw_parts(ptr, $size) |
| } |
| } |
| |
| fn as_mut_slice(&mut self) -> &mut [T] { |
| unsafe { |
| let ptr = &mut self.0 as *mut T; |
| slice::from_raw_parts_mut(ptr, $size) |
| } |
| } |
| } |
| } |
| } |
| |
| impl_tuple_slice!((T, T), 2); |
| impl_tuple_slice!((T, T, T), 3); |
| impl_tuple_slice!((T, T, T, T), 4); |
| impl_tuple_slice!((T, T, T, T, T), 5); |
| impl_tuple_slice!((T, T, T, T, T, T), 6); |
| impl_tuple_slice!((T, T, T, T, T, T, T), 7); |
| impl_tuple_slice!((T, T, T, T, T, T, T, T), 8); |
| |
| #[test] |
| fn test_sliced_tuples() { |
| let t2 = (100, 101); |
| assert_eq!(t2.as_slice(), &[100, 101]); |
| |
| let t3 = (102, 103, 104); |
| assert_eq!(t3.as_slice(), &[102, 103, 104]); |
| |
| let t4 = (105, 106, 107, 108); |
| assert_eq!(t4.as_slice(), &[105, 106, 107, 108]); |
| |
| let t5 = (109, 110, 111, 112, 113); |
| assert_eq!(t5.as_slice(), &[109, 110, 111, 112, 113]); |
| |
| let t6 = (114, 115, 116, 117, 118, 119); |
| assert_eq!(t6.as_slice(), &[114, 115, 116, 117, 118, 119]); |
| |
| let t7 = (120, 121, 122, 123, 124, 125, 126); |
| assert_eq!(t7.as_slice(), &[120, 121, 122, 123, 124, 125, 126]); |
| |
| let t8 = (127, 128, 129, 130, 131, 132, 133, 134); |
| assert_eq!(t8.as_slice(), &[127, 128, 129, 130, 131, 132, 133, 134]); |
| |
| } |