arrayvec/src/array.rs at arrayvec-copy-2 · gz/arrayvec · GitHub

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/// Trait for fixed size arrays.

pub unsafe trait Array {

/// The array's element type

type Item;

#[doc(hidden)]

/// The smallest index type that indexes the array.

type Index: Index;

#[doc(hidden)]

fn as_ptr(&self) -> *const Self::Item;

#[doc(hidden)]

fn as_mut_ptr(&mut self) -> *mut Self::Item;

#[doc(hidden)]

fn capacity() -> usize;

}

pub trait Index : PartialEq + Copy {

fn to_usize(self) -> usize;

fn from(usize) -> Self;

}

impl Index for u8 {

#[inline(always)]

fn to_usize(self) -> usize { self as usize }

#[inline(always)]

fn from(ix: usize) -> Self { ix as u8 }

}

impl Index for u16 {

#[inline(always)]

fn to_usize(self) -> usize { self as usize }

#[inline(always)]

fn from(ix: usize) -> Self { ix as u16 }

}

macro_rules! fix_array_impl {

($index_type:ty, $len:expr ) => (

unsafe impl<T> Array for [T; $len] {

type Item = T;

type Index = $index_type;

#[inline(always)]

fn as_ptr(&self) -> *const T { self as *const _ as *const _ }

#[inline(always)]

fn as_mut_ptr(&mut self) -> *mut T { self as *mut _ as *mut _}

#[inline(always)]

fn capacity() -> usize { $len }

}

)

}

macro_rules! fix_array_impl_recursive {

($index_type:ty, ) => ();

($index_type:ty, $len:expr, $($more:expr,)*) => (

fix_array_impl!($index_type, $len);

fix_array_impl_recursive!($index_type, $($more,)*);

);

}

fix_array_impl_recursive!(u8, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,

16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,

32, 40, 48, 56, 64, 72, 96, 128, 160, 192, 224,);

fix_array_impl_recursive!(u16, 256, 384, 512, 768, 1024, 2048, 4096, 8192, 16384, 32768,);

arrayvec/src/array.rs at arrayvec-copy-2 · gz/arrayvec · GitHub

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