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Add TupleSlice trait to rustc_data_structures.
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// 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. | ||
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use std::slice; | ||
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/// Allows to view uniform tuples as slices | ||
pub trait TupleSlice<T> { | ||
fn as_slice(&self) -> &[T]; | ||
fn as_mut_slice(&mut self) -> &mut [T]; | ||
} | ||
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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) | ||
} | ||
} | ||
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fn as_mut_slice(&mut self) -> &mut [T] { | ||
unsafe { | ||
let ptr = &mut self.0 as *mut T; | ||
slice::from_raw_parts_mut(ptr, $size) | ||
} | ||
} | ||
} | ||
} | ||
} | ||
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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); | ||
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#[test] | ||
fn test_sliced_tuples() { | ||
let t2 = (100i32, 101i32); | ||
assert_eq!(t2.as_slice(), &[100i32, 101i32]); | ||
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let t3 = (102i32, 103i32, 104i32); | ||
assert_eq!(t3.as_slice(), &[102i32, 103i32, 104i32]); | ||
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let t4 = (105i32, 106i32, 107i32, 108i32); | ||
assert_eq!(t4.as_slice(), &[105i32, 106i32, 107i32, 108i32]); | ||
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let t5 = (109i32, 110i32, 111i32, 112i32, 113i32); | ||
assert_eq!(t5.as_slice(), &[109i32, 110i32, 111i32, 112i32, 113i32]); | ||
} |