bluss
64 lines
1.8 KiB
Rust
64 lines
1.8 KiB
Rust
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/// Trait for fixed size arrays.
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pub unsafe trait Array {
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/// The array's element type
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type Item;
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#[doc(hidden)]
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/// The smallest index type that indexes the array.
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type Index: Index;
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#[doc(hidden)]
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fn as_ptr(&self) -> *const Self::Item;
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#[doc(hidden)]
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fn as_mut_ptr(&mut self) -> *mut Self::Item;
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#[doc(hidden)]
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fn capacity() -> usize;
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}
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pub trait Index : PartialEq + Copy {
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fn to_usize(self) -> usize;
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fn from(usize) -> Self;
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}
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impl Index for u8 {
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#[inline(always)]
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fn to_usize(self) -> usize { self as usize }
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#[inline(always)]
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fn from(ix: usize) -> Self { ix as u8 }
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}
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impl Index for u16 {
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#[inline(always)]
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fn to_usize(self) -> usize { self as usize }
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#[inline(always)]
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fn from(ix: usize) -> Self { ix as u16 }
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}
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macro_rules! fix_array_impl {
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($index_type:ty, $len:expr ) => (
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unsafe impl<T> Array for [T; $len] {
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type Item = T;
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type Index = $index_type;
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#[inline(always)]
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fn as_ptr(&self) -> *const T { self as *const _ as *const _ }
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#[inline(always)]
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fn as_mut_ptr(&mut self) -> *mut T { self as *mut _ as *mut _}
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#[inline(always)]
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fn capacity() -> usize { $len }
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}
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)
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}
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macro_rules! fix_array_impl_recursive {
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($index_type:ty, ) => ();
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($index_type:ty, $len:expr, $($more:expr,)*) => (
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fix_array_impl!($index_type, $len);
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fix_array_impl_recursive!($index_type, $($more,)*);
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);
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}
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fix_array_impl_recursive!(u8, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
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32, 40, 48, 56, 64, 72, 96, 128, 160, 192, 224,);
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fix_array_impl_recursive!(u16, 256, 384, 512, 768, 1024, 2048, 4096, 8192, 16384, 32768,);
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