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Diffstat (limited to 'src/libcore/array.rs')
| -rw-r--r-- | src/libcore/array.rs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/libcore/array.rs b/src/libcore/array.rs index 0d98cff7e6a..edb11df5489 100644 --- a/src/libcore/array.rs +++ b/src/libcore/array.rs @@ -23,10 +23,34 @@ use marker::{Copy, Sized}; use option::Option; use slice::{Iter, IterMut, SliceExt}; +/// Utility trait implemented only on arrays of fixed size +/// +/// This trait can be used to implement other traits on fixed-size arrays +/// without causing much metadata bloat. +#[unstable(feature = "core")] +pub trait FixedSizeArray<T> { + /// Converts the array to immutable slice + fn as_slice(&self) -> &[T]; + /// Converts the array to mutable slice + fn as_mut_slice(&mut self) -> &mut [T]; +} + // macro for implementing n-ary tuple functions and operations macro_rules! array_impls { ($($N:expr)+) => { $( + #[unstable(feature = "core")] + impl<T> FixedSizeArray<T> for [T; $N] { + #[inline] + fn as_slice(&self) -> &[T] { + &self[..] + } + #[inline] + fn as_mut_slice(&mut self) -> &mut [T] { + &mut self[..] + } + } + #[stable(feature = "rust1", since = "1.0.0")] impl<T:Copy> Clone for [T; $N] { fn clone(&self) -> [T; $N] { |